iic
Xilinx Vitis Drivers API Documentation
Iic_v3_8

Data Structures

struct  XIic_Config
 This typedef contains configuration information for the device. More...
 
struct  XIicStats
 XIic statistics. More...
 
struct  XIic
 The XIic driver instance data. More...
 

Macros

#define XII_ADDR_TO_SEND_TYPE   1
 Bus address of slave device. More...
 
#define XII_ADDR_TO_RESPOND_TYPE   2
 This device's bus address as slave. More...
 
#define XIIC_READ_OPERATION   1
 The following constants are used to specify whether to do Read or a Write operation on IIC bus. More...
 
#define XIIC_WRITE_OPERATION   0
 Write operation on the IIC bus. More...
 
#define XIIC_MASTER_ROLE   1
 The following constants are used with the transmit FIFO fill function to specify the role which the IIC device is acting as, a master or a slave. More...
 
#define XIIC_SLAVE_ROLE   0
 Slave on the IIC bus. More...
 
#define XIIC_STOP   0x00
 The following constants are used with Transmit Function (XIic_Send) to specify whether to STOP after the current transfer of data or own the bus with a Repeated start. More...
 
#define XIIC_REPEATED_START   0x01
 Donot Send a stop on the IIC bus after the current data transfer. More...
 
#define XIic_ReadReg(BaseAddress, RegOffset)   XIic_In32((BaseAddress) + (RegOffset))
 Read from the specified IIC device register. More...
 
#define XIic_WriteReg(BaseAddress, RegOffset, RegisterValue)   XIic_Out32((BaseAddress) + (RegOffset), (RegisterValue))
 Write to the specified IIC device register. More...
 
#define XIic_IntrGlobalDisable(BaseAddress)   XIic_WriteReg((BaseAddress), XIIC_DGIER_OFFSET, 0)
 This macro disables all interrupts for the device by writing to the Global interrupt enable register. More...
 
#define XIic_IntrGlobalEnable(BaseAddress)
 This macro writes to the global interrupt enable register to enable interrupts from the device. More...
 
#define XIic_IsIntrGlobalEnabled(BaseAddress)
 This function determines if interrupts are enabled at the global level by reading the global interrupt register. More...
 
#define XIic_WriteIisr(BaseAddress, Status)   XIic_WriteReg((BaseAddress), XIIC_IISR_OFFSET, (Status))
 This function sets the Interrupt status register to the specified value. More...
 
#define XIic_ReadIisr(BaseAddress)   XIic_ReadReg((BaseAddress), XIIC_IISR_OFFSET)
 This function gets the contents of the Interrupt Status Register. More...
 
#define XIic_WriteIier(BaseAddress, Enable)   XIic_WriteReg((BaseAddress), XIIC_IIER_OFFSET, (Enable))
 This function sets the contents of the Interrupt Enable Register. More...
 
#define XIic_ReadIier(BaseAddress)   XIic_ReadReg((BaseAddress), XIIC_IIER_OFFSET)
 This function gets the Interrupt Enable Register contents. More...
 
#define XIic_ClearIisr(BaseAddress, InterruptMask)
 This macro clears the specified interrupt in the Interrupt status register. More...
 
#define XIic_Send7BitAddress(BaseAddress, SlaveAddress, Operation)
 This macro sends the address for a 7 bit address during both read and write operations. More...
 
#define XIic_DynSend7BitAddress(BaseAddress, SlaveAddress, Operation)
 This macro sends the address for a 7 bit address during both read and write operations. More...
 
#define XIic_DynSendStartStopAddress(BaseAddress, SlaveAddress, Operation)
 This macro sends the address, start and stop for a 7 bit address during both write operations. More...
 
#define XIic_DynSendStop(BaseAddress, ByteCount)
 This macro sends a stop condition on IIC bus for Dynamic logic. More...
 

Typedefs

typedef void(* XIic_Handler )(void *CallBackRef, int ByteCount)
 This callback function data type is defined to handle the asynchronous processing of sent and received data of the IIC driver. More...
 
typedef void(* XIic_StatusHandler )(void *CallBackRef, int StatusEvent)
 This callback function data type is defined to handle the asynchronous processing of status events of the IIC driver. More...
 

Functions

int XIic_CfgInitialize (XIic *InstancePtr, XIic_Config *Config, UINTPTR EffectiveAddr)
 Initializes a specific XIic instance. More...
 
int XIic_Start (XIic *InstancePtr)
 This function starts the IIC device and driver by enabling the proper interrupts such that data may be sent and received on the IIC bus. More...
 
int XIic_Stop (XIic *InstancePtr)
 This function stops the IIC device and driver such that data is no longer sent or received on the IIC bus. More...
 
void XIic_Reset (XIic *InstancePtr)
 Resets the IIC device. More...
 
int XIic_SetAddress (XIic *InstancePtr, int AddressType, int Address)
 This function sets the bus addresses. More...
 
u16 XIic_GetAddress (XIic *InstancePtr, int AddressType)
 This function gets the addresses for the IIC device driver. More...
 
int XIic_SetGpOutput (XIic *InstancePtr, u8 OutputValue)
 This function sets the contents of the General Purpose Output register for the IIC device driver. More...
 
int XIic_GetGpOutput (XIic *InstancePtr, u8 *OutputValuePtr)
 This function gets the contents of the General Purpose Output register for the IIC device driver. More...
 
u32 XIic_IsSlave (XIic *InstancePtr)
 A function to determine if the device is currently addressed as a slave. More...
 
void XIic_SetRecvHandler (XIic *InstancePtr, void *CallBackRef, XIic_Handler FuncPtr)
 Sets the receive callback function, the receive handler, which the driver calls when it finishes receiving data. More...
 
void XIic_SetSendHandler (XIic *InstancePtr, void *CallBackRef, XIic_Handler FuncPtr)
 Sets the send callback function, the send handler, which the driver calls when it receives confirmation of sent data. More...
 
void XIic_SetStatusHandler (XIic *InstancePtr, void *CallBackRef, XIic_StatusHandler FuncPtr)
 Sets the status callback function, the status handler, which the driver calls when it encounters conditions which are not data related. More...
 
int XIic_Initialize (XIic *InstancePtr, u16 DeviceId)
 Initializes a specific XIic instance. More...
 
XIic_ConfigXIic_LookupConfig (u16 DeviceId)
 Looks up the device configuration based on the unique device ID. More...
 
void XIic_InterruptHandler (void *InstancePtr)
 This function is the interrupt handler for the XIic driver. More...
 
int XIic_MasterRecv (XIic *InstancePtr, u8 *RxMsgPtr, int ByteCount)
 This function receives data as a master from a slave device on the IIC bus. More...
 
int XIic_MasterSend (XIic *InstancePtr, u8 *TxMsgPtr, int ByteCount)
 This function sends data as a master on the IIC bus. More...
 
int XIic_DynMasterRecv (XIic *InstancePtr, u8 *RxMsgPtr, u8 ByteCount)
 This function receives data as a master from a slave device on the IIC bus. More...
 
int XIic_DynMasterSend (XIic *InstancePtr, u8 *TxMsgPtr, u8 ByteCount)
 This function sends data as a Dynamic master on the IIC bus. More...
 
void XIic_SlaveInclude (void)
 This function includes slave code such that slave events will be processed. More...
 
int XIic_SlaveRecv (XIic *InstancePtr, u8 *RxMsgPtr, int ByteCount)
 This function sends data as a slave on the IIC bus and should not be called until an event has occurred that indicates the device has been selected by a master attempting read from the slave (XII_MASTER_READ_EVENT). More...
 
int XIic_SlaveSend (XIic *InstancePtr, u8 *TxMsgPtr, int ByteCount)
 This function sends data as a slave on the IIC bus and should not be called until an event has occurred that indicates the device has been selected by a master attempting read from the slave (XII_MASTER_READ_EVENT). More...
 
void XIic_GetStats (XIic *InstancePtr, XIicStats *StatsPtr)
 Gets a copy of the statistics for an IIC device. More...
 
void XIic_ClearStats (XIic *InstancePtr)
 Clears the statistics for the IIC device by zeroing all counts. More...
 
int XIic_SelfTest (XIic *InstancePtr)
 Runs a limited self-test on the driver/device. More...
 
void XIic_SetOptions (XIic *InstancePtr, u32 NewOptions)
 This function sets the options for the IIC device driver. More...
 
u32 XIic_GetOptions (XIic *InstancePtr)
 This function gets the current options for the IIC device. More...
 
void XIic_MultiMasterInclude (void)
 This function includes multi-master code such that multi-master events are handled properly. More...
 
unsigned XIic_Recv (UINTPTR BaseAddress, u8 Address, u8 *BufferPtr, unsigned ByteCount, u8 Option)
 Receive data as a master on the IIC bus. More...
 
unsigned XIic_Send (UINTPTR BaseAddress, u8 Address, u8 *BufferPtr, unsigned ByteCount, u8 Option)
 Send data as a master on the IIC bus. More...
 
unsigned XIic_DynRecv (UINTPTR BaseAddress, u8 Address, u8 *BufferPtr, u8 ByteCount)
 Receive data as a master on the IIC bus. More...
 
unsigned XIic_DynSend (UINTPTR BaseAddress, u16 Address, u8 *BufferPtr, u8 ByteCount, u8 Option)
 Send data as a master on the IIC bus. More...
 
u32 XIic_WaitBusFree (UINTPTR BaseAddress)
 This function will wait until the I2C bus is free or timeout. More...
 

Variables

XIic_Config XIic_ConfigTable [XPAR_XIIC_NUM_INSTANCES]
 The IIC configuration table, sized by the number of instances defined in xparameters.h. More...
 
XIic_Config XIic_ConfigTable []
 The IIC configuration table, sized by the number of instances defined in xparameters.h. More...
 

Configuration options

The following options may be specified or retrieved for the device and enable/disable additional features of the IIC bus.

Each of the options are bit fields such that more than one may be specified.

#define XII_GENERAL_CALL_OPTION   0x00000001
 
#define XII_REPEATED_START_OPTION   0x00000002
 
#define XII_SEND_10_BIT_OPTION   0x00000004
 

Status events

The following status events occur during IIC bus processing and are passed to the status callback.

Each event is only valid during the appropriate processing of the IIC bus. Each of these events are bit fields such that more than one may be specified.

#define XII_BUS_NOT_BUSY_EVENT   0x00000001
 Bus transitioned to not busy. More...
 
#define XII_ARB_LOST_EVENT   0x00000002
 Arbitration was lost. More...
 
#define XII_SLAVE_NO_ACK_EVENT   0x00000004
 Slave did not ACK (had error) More...
 
#define XII_MASTER_READ_EVENT   0x00000008
 Master reading from slave. More...
 
#define XII_MASTER_WRITE_EVENT   0x00000010
 Master writing to slave. More...
 
#define XII_GENERAL_CALL_EVENT   0x00000020
 General call to all slaves. More...
 

Register Map

Register offsets for the XIic device.

#define XIIC_DGIER_OFFSET   0x1C
 Global Interrupt Enable Register. More...
 
#define XIIC_IISR_OFFSET   0x20
 Interrupt Status Register. More...
 
#define XIIC_IIER_OFFSET   0x28
 Interrupt Enable Register. More...
 
#define XIIC_RESETR_OFFSET   0x40
 Reset Register. More...
 
#define XIIC_CR_REG_OFFSET   0x100
 Control Register. More...
 
#define XIIC_SR_REG_OFFSET   0x104
 Status Register. More...
 
#define XIIC_DTR_REG_OFFSET   0x108
 Data Tx Register. More...
 
#define XIIC_DRR_REG_OFFSET   0x10C
 Data Rx Register. More...
 
#define XIIC_ADR_REG_OFFSET   0x110
 Address Register. More...
 
#define XIIC_TFO_REG_OFFSET   0x114
 Tx FIFO Occupancy. More...
 
#define XIIC_RFO_REG_OFFSET   0x118
 Rx FIFO Occupancy. More...
 
#define XIIC_TBA_REG_OFFSET   0x11C
 10 Bit Address reg More...
 
#define XIIC_RFD_REG_OFFSET   0x120
 Rx FIFO Depth reg. More...
 
#define XIIC_GPO_REG_OFFSET   0x124
 Output Register. More...
 

Device Global Interrupt Enable Register masks (CR) mask(s)

#define XIIC_GINTR_ENABLE_MASK   0x80000000
 Global Interrupt Enable Mask. More...
 

IIC Device Interrupt Status/Enable (INTR) Register Masks

Interrupt Status Register (IISR)

This register holds the interrupt status flags for the Spi device.

Interrupt Enable Register (IIER)

This register is used to enable interrupt sources for the IIC device. Writing a '1' to a bit in this register enables the corresponding Interrupt. Writing a '0' to a bit in this register disables the corresponding Interrupt.

IISR/IIER registers have the same bit definitions and are only defined once.

#define XIIC_INTR_ARB_LOST_MASK   0x00000001
 1 = Arbitration lost More...
 
#define XIIC_INTR_TX_ERROR_MASK   0x00000002
 1 = Tx error/msg complete More...
 
#define XIIC_INTR_TX_EMPTY_MASK   0x00000004
 1 = Tx FIFO/reg empty More...
 
#define XIIC_INTR_RX_FULL_MASK   0x00000008
 1 = Rx FIFO/reg=OCY level More...
 
#define XIIC_INTR_BNB_MASK   0x00000010
 1 = Bus not busy More...
 
#define XIIC_INTR_AAS_MASK   0x00000020
 1 = When addr as slave More...
 
#define XIIC_INTR_NAAS_MASK   0x00000040
 1 = Not addr as slave More...
 
#define XIIC_INTR_TX_HALF_MASK   0x00000080
 1 = Tx FIFO half empty More...
 
#define XIIC_TX_INTERRUPTS
 All Tx interrupts commonly used. More...
 
#define XIIC_TX_RX_INTERRUPTS   (XIIC_INTR_RX_FULL_MASK | XIIC_TX_INTERRUPTS)
 All interrupts commonly used. More...
 

Reset Register mask

#define XIIC_RESET_MASK   0x0000000A
 RESET Mask. More...
 

Control Register masks (CR) mask(s)

#define XIIC_CR_ENABLE_DEVICE_MASK   0x00000001
 Device enable = 1. More...
 
#define XIIC_CR_TX_FIFO_RESET_MASK   0x00000002
 Transmit FIFO reset=1. More...
 
#define XIIC_CR_MSMS_MASK   0x00000004
 Master starts Txing=1. More...
 
#define XIIC_CR_DIR_IS_TX_MASK   0x00000008
 Dir of Tx. More...
 
#define XIIC_CR_NO_ACK_MASK   0x00000010
 Tx Ack. More...
 
#define XIIC_CR_REPEATED_START_MASK   0x00000020
 Repeated start = 1. More...
 
#define XIIC_CR_GENERAL_CALL_MASK   0x00000040
 Gen Call enabled = 1. More...
 

Status Register masks (SR) mask(s)

#define XIIC_SR_GEN_CALL_MASK   0x00000001
 1 = A Master issued a GC More...
 
#define XIIC_SR_ADDR_AS_SLAVE_MASK   0x00000002
 1 = When addressed as slave More...
 
#define XIIC_SR_BUS_BUSY_MASK   0x00000004
 1 = Bus is busy More...
 
#define XIIC_SR_MSTR_RDING_SLAVE_MASK   0x00000008
 1 = Dir: Master <– slave More...
 
#define XIIC_SR_TX_FIFO_FULL_MASK   0x00000010
 1 = Tx FIFO full More...
 
#define XIIC_SR_RX_FIFO_FULL_MASK   0x00000020
 1 = Rx FIFO full More...
 
#define XIIC_SR_RX_FIFO_EMPTY_MASK   0x00000040
 1 = Rx FIFO empty More...
 
#define XIIC_SR_TX_FIFO_EMPTY_MASK   0x00000080
 1 = Tx FIFO empty More...
 

Data Tx Register (DTR) mask(s)

#define XIIC_TX_DYN_START_MASK   0x00000100
 1 = Set dynamic start More...
 
#define XIIC_TX_DYN_STOP_MASK   0x00000200
 1 = Set dynamic stop More...
 
#define IIC_TX_FIFO_DEPTH   16
 Tx fifo capacity. More...
 

Data Rx Register (DRR) mask(s)

#define IIC_RX_FIFO_DEPTH   16
 Rx fifo capacity. More...
 

Macro Definition Documentation

#define IIC_RX_FIFO_DEPTH   16

Rx fifo capacity.

Referenced by XIic_DynMasterRecv(), XIic_MasterRecv(), and XIic_SlaveRecv().

#define IIC_TX_FIFO_DEPTH   16

Tx fifo capacity.

#define XII_ADDR_TO_RESPOND_TYPE   2

This device's bus address as slave.

Referenced by IicSlaveExample(), IicTenBitAddrExample(), XIic_GetAddress(), and XIic_SetAddress().

#define XII_ADDR_TO_SEND_TYPE   1
#define XII_ARB_LOST_EVENT   0x00000002

Arbitration was lost.

#define XII_BUS_NOT_BUSY_EVENT   0x00000001

Bus transitioned to not busy.

#define XII_GENERAL_CALL_EVENT   0x00000020

General call to all slaves.

#define XII_GENERAL_CALL_OPTION   0x00000001
XII_GENERAL_CALL_OPTION The general call option allows an IIC slave to
                        recognized the general call address. The status
                        handler is called as usual indicating the device
                        has been addressed as a slave with a general
                        call. It is the application's responsibility to
                        perform any special processing for the general
                        call.
XII_REPEATED_START_OPTION       The repeated start option allows multiple
                        messages to be sent/received on the IIC bus
                        without rearbitrating for the bus.  The messages
                        are sent as a series of messages such that the
                        option must be enabled before the 1st message of
                        the series, to prevent an stop condition from
                        being generated on the bus, and disabled before
                        the last message of the series, to allow the
                        stop condition to be generated.
XII_SEND_10_BIT_OPTION  The send 10 bit option allows 10 bit addresses
                        to be sent on the bus when the device is a
                        master. The device can be configured to respond
                        as to 7 bit addresses even though it may be
                        communicating with other devices that support 10
                        bit addresses.  When this option is not enabled,
                        only 7 bit addresses are sent on the bus.
 

Referenced by XIic_SetOptions().

#define XII_MASTER_READ_EVENT   0x00000008

Master reading from slave.

#define XII_MASTER_WRITE_EVENT   0x00000010

Master writing to slave.

#define XII_SLAVE_NO_ACK_EVENT   0x00000004

Slave did not ACK (had error)

#define XIIC_ADR_REG_OFFSET   0x110

Address Register.

Referenced by XIic_GetAddress(), and XIic_SetAddress().

#define XIic_ClearIisr (   BaseAddress,
  InterruptMask 
)
Value:
XIic_WriteIisr((BaseAddress), \
XIic_ReadIisr(BaseAddress) & (InterruptMask))
#define XIic_ReadIisr(BaseAddress)
This function gets the contents of the Interrupt Status Register.
Definition: xiic_l.h:384
#define XIic_WriteIisr(BaseAddress, Status)
This function sets the Interrupt status register to the specified value.
Definition: xiic_l.h:365

This macro clears the specified interrupt in the Interrupt status register.

It is non-destructive in that the register is read and only the interrupt specified is cleared. Clearing an interrupt acknowledges it.

Parameters
BaseAddressis the base address of the IIC device.
InterruptMaskis the bit mask of the interrupts to be cleared.
Returns
None.
Note
C-Style signature: void XIic_ClearIisr(u32 BaseAddress, u32 InterruptMask);

Referenced by XIic_DynRecv(), XIic_DynSend(), XIic_Recv(), and XIic_Send().

#define XIIC_CR_DIR_IS_TX_MASK   0x00000008

Dir of Tx.

Txing=1

Referenced by XIic_DynMasterSend(), XIic_MasterSend(), XIic_Recv(), and XIic_Send().

#define XIIC_CR_ENABLE_DEVICE_MASK   0x00000001

Device enable = 1.

Referenced by EepromReadByte(), EepromWriteByte(), XIic_Recv(), XIic_Send(), and XIic_Start().

#define XIIC_CR_GENERAL_CALL_MASK   0x00000040

Gen Call enabled = 1.

Referenced by XIic_SetOptions().

#define XIIC_CR_MSMS_MASK   0x00000004
#define XIIC_CR_NO_ACK_MASK   0x00000010

Tx Ack.

NO ack = 1

Referenced by XIic_DynMasterSend(), XIic_MasterSend(), and XIic_Recv().

#define XIIC_CR_REPEATED_START_MASK   0x00000020
#define XIIC_CR_TX_FIFO_RESET_MASK   0x00000002

Transmit FIFO reset=1.

Referenced by EepromReadByte(), and EepromWriteByte().

#define XIIC_DGIER_OFFSET   0x1C

Global Interrupt Enable Register.

#define XIIC_DRR_REG_OFFSET   0x10C

Data Rx Register.

#define XIIC_DTR_REG_OFFSET   0x108

Data Tx Register.

#define XIic_DynSend7BitAddress (   BaseAddress,
  SlaveAddress,
  Operation 
)
Value:
{ \
u8 LocalAddr = (u8)(SlaveAddress << 1); \
LocalAddr = (LocalAddr & 0xFE) | (Operation); \
XIIC_TX_DYN_START_MASK | LocalAddr); \
}
#define XIIC_TX_DYN_START_MASK
1 = Set dynamic start
Definition: xiic_l.h:191
#define XIic_WriteReg(BaseAddress, RegOffset, RegisterValue)
Write to the specified IIC device register.
Definition: xiic_l.h:281
#define XIIC_DTR_REG_OFFSET
Data Tx Register.
Definition: xiic_l.h:90

This macro sends the address for a 7 bit address during both read and write operations.

It takes care of the details to format the address correctly. This macro is designed to be called internally to the drivers for Dynamic controller functionality.

Parameters
BaseAddressis the base address of the IIC Device.
SlaveAddressis the address of the slave to send to.
Operationindicates XIIC_READ_OPERATION or XIIC_WRITE_OPERATION.
Returns
None.
Note
C-Style signature: void XIic_DynSend7BitAddress(u32 BaseAddress, u8 SlaveAddress, u8 Operation);

Referenced by XIic_DynMasterRecv(), XIic_DynMasterSend(), XIic_DynRecv(), and XIic_DynSend().

#define XIic_DynSendStartStopAddress (   BaseAddress,
  SlaveAddress,
  Operation 
)
Value:
{ \
u8 LocalAddr = (u8)(SlaveAddress << 1); \
LocalAddr = (LocalAddr & 0xFE) | (Operation); \
LocalAddr); \
}
#define XIIC_TX_DYN_START_MASK
1 = Set dynamic start
Definition: xiic_l.h:191
#define XIic_WriteReg(BaseAddress, RegOffset, RegisterValue)
Write to the specified IIC device register.
Definition: xiic_l.h:281
#define XIIC_DTR_REG_OFFSET
Data Tx Register.
Definition: xiic_l.h:90
#define XIIC_TX_DYN_STOP_MASK
1 = Set dynamic stop
Definition: xiic_l.h:192

This macro sends the address, start and stop for a 7 bit address during both write operations.

It takes care of the details to format the address correctly. This macro is designed to be called internally to the drivers.

Parameters
BaseAddressis the base address of the IIC Device.
SlaveAddressis the address of the slave to send to.
Operationindicates XIIC_WRITE_OPERATION.
Returns
None.
Note
C-Style signature: void XIic_DynSendStartStopAddress(u32 BaseAddress, u8 SlaveAddress, u8 Operation);

Referenced by XIic_DynSend().

#define XIic_DynSendStop (   BaseAddress,
  ByteCount 
)
Value:
{ \
XIIC_TX_DYN_STOP_MASK | ByteCount); \
}
#define XIic_WriteReg(BaseAddress, RegOffset, RegisterValue)
Write to the specified IIC device register.
Definition: xiic_l.h:281
#define XIIC_DTR_REG_OFFSET
Data Tx Register.
Definition: xiic_l.h:90
#define XIIC_TX_DYN_STOP_MASK
1 = Set dynamic stop
Definition: xiic_l.h:192

This macro sends a stop condition on IIC bus for Dynamic logic.

Parameters
BaseAddressis the base address of the IIC Device.
ByteCountis the number of Rx bytes received before the master. doesn't respond with ACK.
Returns
None.
Note
C-Style signature: void XIic_DynSendStop(u32 BaseAddress, u32 ByteCount);

Referenced by XIic_DynMasterRecv(), and XIic_DynRecv().

#define XIIC_GINTR_ENABLE_MASK   0x80000000

Global Interrupt Enable Mask.

#define XIIC_GPO_REG_OFFSET   0x124

Output Register.

Referenced by XIic_GetGpOutput(), and XIic_SetGpOutput().

#define XIIC_IIER_OFFSET   0x28

Interrupt Enable Register.

#define XIIC_IISR_OFFSET   0x20

Interrupt Status Register.

#define XIIC_INTR_AAS_MASK   0x00000020

1 = When addr as slave

Referenced by XIic_InterruptHandler(), and XIic_Start().

#define XIIC_INTR_ARB_LOST_MASK   0x00000001
#define XIIC_INTR_BNB_MASK   0x00000010
#define XIIC_INTR_NAAS_MASK   0x00000040

1 = Not addr as slave

Referenced by XIic_InterruptHandler().

#define XIIC_INTR_RX_FULL_MASK   0x00000008
#define XIIC_INTR_TX_EMPTY_MASK   0x00000004
#define XIIC_INTR_TX_ERROR_MASK   0x00000002
#define XIIC_INTR_TX_HALF_MASK   0x00000080
#define XIic_IntrGlobalDisable (   BaseAddress)    XIic_WriteReg((BaseAddress), XIIC_DGIER_OFFSET, 0)

This macro disables all interrupts for the device by writing to the Global interrupt enable register.

Parameters
BaseAddressis the base address of the IIC device.
Returns
None.
Note
C-Style signature: void XIic_IntrGlobalDisable(u32 BaseAddress);

Referenced by SlaveReadData(), SlaveWriteData(), TenBitAddrReadData(), TenBitAddrWriteData(), XIic_DynMasterRecv(), XIic_DynMasterSend(), XIic_MasterRecv(), XIic_MasterSend(), XIic_SetOptions(), XIic_SlaveRecv(), XIic_SlaveSend(), and XIic_Stop().

#define XIic_IntrGlobalEnable (   BaseAddress)
Value:
#define XIic_WriteReg(BaseAddress, RegOffset, RegisterValue)
Write to the specified IIC device register.
Definition: xiic_l.h:281
#define XIIC_GINTR_ENABLE_MASK
Global Interrupt Enable Mask.
Definition: xiic_l.h:105
#define XIIC_DGIER_OFFSET
Global Interrupt Enable Register.
Definition: xiic_l.h:84

This macro writes to the global interrupt enable register to enable interrupts from the device.

This function does not enable individual interrupts as the Interrupt Enable Register must be set appropriately.

Parameters
BaseAddressis the base address of the IIC device.
Returns
None.
Note
C-Style signature: void XIic_IntrGlobalEnable(u32 BaseAddress);

Referenced by SlaveReadData(), SlaveWriteData(), TenBitAddrReadData(), TenBitAddrWriteData(), XIic_DynMasterRecv(), XIic_DynMasterSend(), XIic_MasterRecv(), XIic_MasterSend(), XIic_SelfTest(), XIic_SetOptions(), XIic_SlaveRecv(), XIic_SlaveSend(), XIic_Start(), and XIic_Stop().

#define XIic_IsIntrGlobalEnabled (   BaseAddress)
Value:
(XIic_ReadReg((BaseAddress), XIIC_DGIER_OFFSET) == \
#define XIIC_GINTR_ENABLE_MASK
Global Interrupt Enable Mask.
Definition: xiic_l.h:105
#define XIIC_DGIER_OFFSET
Global Interrupt Enable Register.
Definition: xiic_l.h:84
#define XIic_ReadReg(BaseAddress, RegOffset)
Read from the specified IIC device register.
Definition: xiic_l.h:258

This function determines if interrupts are enabled at the global level by reading the global interrupt register.

Parameters
BaseAddressis the base address of the IIC device.
Returns
  • TRUE if the global interrupt is enabled.
  • FALSE if global interrupt is disabled.
Note
C-Style signature: int XIic_IsIntrGlobalEnabled(u32 BaseAddress);

Referenced by XIic_InterruptHandler(), and XIic_SelfTest().

#define XIIC_MASTER_ROLE   1

The following constants are used with the transmit FIFO fill function to specify the role which the IIC device is acting as, a master or a slave.

Master on the IIC bus

Referenced by XIic_DynMasterSend(), and XIic_MasterSend().

#define XIIC_READ_OPERATION   1

The following constants are used to specify whether to do Read or a Write operation on IIC bus.

Read operation on the IIC bus

Referenced by XIic_DynMasterRecv(), XIic_DynRecv(), XIic_MasterRecv(), and XIic_Recv().

#define XIic_ReadIier (   BaseAddress)    XIic_ReadReg((BaseAddress), XIIC_IIER_OFFSET)

This function gets the Interrupt Enable Register contents.

Parameters
BaseAddressis the base address of the IIC device.
Returns
The contents read from the Interrupt Enable Register. Bit positions of 1 indicate that the corresponding interrupt is enabled. Bit positions of 0 indicate that the corresponding interrupt is disabled.
Note
C-Style signature: u32 XIic_ReadIier(u32 BaseAddress)

Referenced by XIic_InterruptHandler(), and XIic_SelfTest().

#define XIic_ReadIisr (   BaseAddress)    XIic_ReadReg((BaseAddress), XIIC_IISR_OFFSET)

This function gets the contents of the Interrupt Status Register.

This register indicates the status of interrupt sources for the device. The status is independent of whether interrupts are enabled such that the status register may also be polled when interrupts are not enabled.

Parameters
BaseAddressis the base address of the IIC device.
Returns
The value read from the Interrupt Status Register.
Note
C-Style signature: u32 XIic_ReadIisr(u32 BaseAddress);

Referenced by XIic_InterruptHandler().

#define XIic_ReadReg (   BaseAddress,
  RegOffset 
)    XIic_In32((BaseAddress) + (RegOffset))

Read from the specified IIC device register.

Parameters
BaseAddressis the base address of the device.
RegOffsetis the offset from the 1st register of the device to select the specific register.
Returns
The value read from the register.
Note
C-Style signature: u32 XIic_ReadReg(u32 BaseAddress, u32 RegOffset);
    This macro does not do any checking to ensure that the
register exists if the register may be excluded due to parameterization, such as the GPO Register.

Referenced by EepromReadByte(), EepromWriteByte(), XIic_DynMasterRecv(), XIic_DynMasterSend(), XIic_DynRecv(), XIic_DynSend(), XIic_GetAddress(), XIic_GetGpOutput(), XIic_InterruptHandler(), XIic_IsSlave(), XIic_MasterRecv(), XIic_MasterSend(), XIic_Recv(), XIic_Send(), XIic_SetOptions(), XIic_SlaveRecv(), XIic_SlaveSend(), and XIic_Stop().

#define XIIC_REPEATED_START   0x01

Donot Send a stop on the IIC bus after the current data transfer.

#define XIIC_RESET_MASK   0x0000000A

RESET Mask.

Referenced by XIic_Reset().

#define XIIC_RESETR_OFFSET   0x40

Reset Register.

Referenced by XIic_Reset().

#define XIIC_RFD_REG_OFFSET   0x120
#define XIIC_RFO_REG_OFFSET   0x118

Rx FIFO Occupancy.

#define XIic_Send7BitAddress (   BaseAddress,
  SlaveAddress,
  Operation 
)
Value:
{ \
u8 LocalAddr = (u8)(SlaveAddress << 1); \
LocalAddr = (LocalAddr & 0xFE) | (Operation); \
XIic_WriteReg(BaseAddress, XIIC_DTR_REG_OFFSET, LocalAddr); \
}
#define XIic_WriteReg(BaseAddress, RegOffset, RegisterValue)
Write to the specified IIC device register.
Definition: xiic_l.h:281
#define XIIC_DTR_REG_OFFSET
Data Tx Register.
Definition: xiic_l.h:90

This macro sends the address for a 7 bit address during both read and write operations.

It takes care of the details to format the address correctly. This macro is designed to be called internally to the drivers.

Parameters
BaseAddressis the base address of the IIC Device.
SlaveAddressis the address of the slave to send to.
Operationindicates XIIC_READ_OPERATION or XIIC_WRITE_OPERATION
Returns
None.
Note
C-Style signature: void XIic_Send7BitAddress(u32 BaseAddress, u8 SlaveAddress, u8 Operation);

Referenced by XIic_Recv(), and XIic_Send().

#define XIIC_SLAVE_ROLE   0

Slave on the IIC bus.

Referenced by XIic_SlaveSend().

#define XIIC_SR_ADDR_AS_SLAVE_MASK   0x00000002
#define XIIC_SR_BUS_BUSY_MASK   0x00000004

1 = Bus is busy

Referenced by EepromReadByte(), XIic_DynRecv(), XIic_DynSend(), XIic_Recv(), and XIic_Send().

#define XIIC_SR_GEN_CALL_MASK   0x00000001

1 = A Master issued a GC

#define XIIC_SR_MSTR_RDING_SLAVE_MASK   0x00000008

1 = Dir: Master <– slave

#define XIIC_SR_RX_FIFO_EMPTY_MASK   0x00000040

1 = Rx FIFO empty

#define XIIC_SR_RX_FIFO_FULL_MASK   0x00000020

1 = Rx FIFO full

#define XIIC_SR_TX_FIFO_EMPTY_MASK   0x00000080

1 = Tx FIFO empty

#define XIIC_SR_TX_FIFO_FULL_MASK   0x00000010

1 = Tx FIFO full

#define XIIC_STOP   0x00

The following constants are used with Transmit Function (XIic_Send) to specify whether to STOP after the current transfer of data or own the bus with a Repeated start.

Send a stop on the IIC bus after the current data transfer

Referenced by EepromReadByte(), EepromWriteByte(), and LowLevelTempSensorExample().

#define XIIC_TBA_REG_OFFSET   0x11C

10 Bit Address reg

Referenced by XIic_GetAddress(), and XIic_SetAddress().

#define XIIC_TFO_REG_OFFSET   0x114

Tx FIFO Occupancy.

#define XIIC_TX_DYN_START_MASK   0x00000100

1 = Set dynamic start

#define XIIC_TX_DYN_STOP_MASK   0x00000200

1 = Set dynamic stop

Referenced by XIic_DynSend().

#define XIIC_TX_INTERRUPTS
Value:
#define XIIC_INTR_TX_EMPTY_MASK
1 = Tx FIFO/reg empty
Definition: xiic_l.h:125
#define XIIC_INTR_TX_HALF_MASK
1 = Tx FIFO half empty
Definition: xiic_l.h:130
#define XIIC_INTR_TX_ERROR_MASK
1 = Tx error/msg complete
Definition: xiic_l.h:124

All Tx interrupts commonly used.

#define XIIC_TX_RX_INTERRUPTS   (XIIC_INTR_RX_FULL_MASK | XIIC_TX_INTERRUPTS)

All interrupts commonly used.

Referenced by XIic_SelfTest().

#define XIIC_WRITE_OPERATION   0

Write operation on the IIC bus.

Referenced by XIic_DynMasterSend(), XIic_DynSend(), XIic_MasterRecv(), XIic_MasterSend(), and XIic_Send().

#define XIic_WriteIier (   BaseAddress,
  Enable 
)    XIic_WriteReg((BaseAddress), XIIC_IIER_OFFSET, (Enable))

This function sets the contents of the Interrupt Enable Register.

This function writes only the specified value to the register such that some interrupt sources may be enabled and others disabled. It is the caller's responsibility to get the value of the interrupt enable register prior to setting the value to prevent a destructive behavior.

Parameters
BaseAddressis the base address of the IIC device.
Enableis the value to be written to the Interrupt Enable Register. Bit positions of 1 will be enabled. Bit positions of 0 will be disabled.
Returns
None
Note
C-Style signature: void XIic_WriteIier(u32 BaseAddress, u32 Enable);

Referenced by XIic_SelfTest(), and XIic_Start().

#define XIic_WriteIisr (   BaseAddress,
  Status 
)    XIic_WriteReg((BaseAddress), XIIC_IISR_OFFSET, (Status))

This function sets the Interrupt status register to the specified value.

This register implements a toggle on write functionality. The interrupt is cleared by writing to this register with the bits to be cleared set to a one and all others to zero. Setting a bit which is zero within this register causes an interrupt to be generated.

This function writes only the specified value to the register such that some status bits may be set and others cleared. It is the caller's responsibility to get the value of the register prior to setting the value to prevent an destructive behavior.

Parameters
BaseAddressis the base address of the IIC device.
Statusis the value to be written to the Interrupt status register.
Returns
None.
Note
C-Style signature: void XIic_WriteIisr(u32 BaseAddress, u32 Status);

Referenced by XIic_InterruptHandler().

#define XIic_WriteReg (   BaseAddress,
  RegOffset,
  RegisterValue 
)    XIic_Out32((BaseAddress) + (RegOffset), (RegisterValue))

Write to the specified IIC device register.

Parameters
BaseAddressis the base address of the device.
RegOffsetis the offset from the 1st register of the device to select the specific register.
RegisterValueis the value to be written to the register.
Returns
None.
Note
C-Style signature: void XIic_WriteReg(u32 BaseAddress, u32 RegOffset, u32 RegisterValue); This macro does not do any checking to ensure that the register exists if the register may be excluded due to parameterization, such as the GPO Register.

Referenced by EepromReadByte(), EepromWriteByte(), XIic_DynMasterRecv(), XIic_DynMasterSend(), XIic_MasterRecv(), XIic_MasterSend(), XIic_Recv(), XIic_Reset(), XIic_Send(), XIic_SetAddress(), XIic_SetGpOutput(), XIic_SetOptions(), XIic_SlaveRecv(), and XIic_Start().

Typedef Documentation

typedef void(* XIic_Handler)(void *CallBackRef, int ByteCount)

This callback function data type is defined to handle the asynchronous processing of sent and received data of the IIC driver.

The application using this driver is expected to define a handler of this type to support interrupt driven mode. The handlers are called in an interrupt context such that minimal processing should be performed. The handler data type is utilized for both send and receive handlers.

Parameters
CallBackRefis a callback reference passed in by the upper layer when setting the callback functions, and passed back to the upper layer when the callback is invoked. Its type is unimportant to the driver component, so it is a void pointer.
ByteCountindicates the number of bytes remaining to be sent or received. A value of zero indicates that the requested number of bytes were sent or received.
typedef void(* XIic_StatusHandler)(void *CallBackRef, int StatusEvent)

This callback function data type is defined to handle the asynchronous processing of status events of the IIC driver.

The application using this driver is expected to define a handler of this type to support interrupt driven mode. The handler is called in an interrupt context such that minimal processing should be performed.

Parameters
CallBackRefis a callback reference passed in by the upper layer when setting the callback functions, and passed back to the upper layer when the callback is invoked. Its type is unimportant to the driver component, so it is a void pointer.
StatusEventindicates one or more status events that occurred. See the definition of the status events above.

Function Documentation

int XIic_CfgInitialize ( XIic InstancePtr,
XIic_Config Config,
UINTPTR  EffectiveAddr 
)

Initializes a specific XIic instance.

The initialization entails:

  • Initialize the driver to allow access to the device registers and initialize other subcomponents necessary for the operation of the device.
  • Default options to:
    • 7-bit slave addressing
    • Send messages as a slave device
    • Repeated start off
    • General call recognition disabled
  • Clear messageing and error statistics

The XIic_Start() function must be called after this function before the device is ready to send and receive data on the IIC bus.

Before XIic_Start() is called, the interrupt control must connect the ISR routine to the interrupt handler. This is done by the user, and not XIic_Start() to allow the user to use an interrupt controller of their choice.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
Configis a reference to a structure containing information about a specific IIC device. This function can initialize multiple instance objects with the use of multiple calls giving different Config information on each call.
EffectiveAddris the device base address in the virtual memory address space. The caller is responsible for keeping the address mapping from EffectiveAddr to the device physical base address unchanged once this function is invoked. Unexpected errors may occur if the address mapping changes after this function is called. If address translation is not used, use Config->BaseAddress for this parameters, passing the physical address instead.
Returns
  • XST_SUCCESS when successful
  • XST_DEVICE_IS_STARTED indicates the device is started (i.e. interrupts enabled and messaging is possible). Must stop before re-initialization is allowed.
Note
None.

References XIic::BaseAddress, XIic::BNBOnly, XIic_Config::GpOutWidth, XIic::GpOutWidth, XIic_Config::Has10BitAddr, XIic::Has10BitAddr, XIic::IsDynamic, XIic::IsReady, XIic::IsSlaveSetAckOff, XIic::IsStarted, XIic::Options, XIic::RecvBufferPtr, XIic::RecvHandler, XIic::SendBufferPtr, XIic::SendHandler, XIic::StatusHandler, XIic_ClearStats(), and XIic_Reset().

Referenced by IicDynEepromExample(), IicEepromExample(), IicMultiMasterExample(), IicRepeatedStartExample(), IicSelfTestExample(), IicSlaveExample(), IicTenBitAddrExample(), TempSensorExample(), and XIic_Initialize().

void XIic_ClearStats ( XIic InstancePtr)

Clears the statistics for the IIC device by zeroing all counts.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
Returns
None.
Note
None.

References XIic::IsReady, and XIic::Stats.

Referenced by XIic_CfgInitialize().

int XIic_DynMasterRecv ( XIic InstancePtr,
u8 *  RxMsgPtr,
u8  ByteCount 
)

This function receives data as a master from a slave device on the IIC bus.

If the bus is busy, it will indicate so and then enable an interrupt such that the status handler will be called when the bus is no longer busy. The slave address which has been set with the XIic_SetAddress() function is the address from which data is received. Receiving data on the bus performs a read operation.

Parameters
InstancePtris a pointer to the Iic instance to be worked on.
RxMsgPtris a pointer to the data to be transmitted.
ByteCountis the number of message bytes to be sent.
Returns
- XST_SUCCESS indicates the message reception processes has been initiated.
  • XST_IIC_BUS_BUSY indicates the bus was in use and that the BusNotBusy interrupt is enabled which will update the EventStatus when the bus is no longer busy.
  • XST_IIC_GENERAL_CALL_ADDRESS indicates the slave address is set to the general call address. This is not allowed for Master receive mode.
Note
The receive FIFO threshold is a zero based count such that 1 must be subtracted from the desired count to get the correct value. When receiving data it is also necessary to not receive the last byte with the prior bytes because the acknowledge must be setup before the last byte is received.

References XIic::AddrOfSlave, XIic::BaseAddress, IIC_RX_FIFO_DEPTH, XIic::IsDynamic, XIic::RecvBufferPtr, XIic::RecvByteCount, XIicStats::RepeatedStarts, XIic::Stats, XIic::TxAddrMode, XIIC_CR_MSMS_MASK, XIIC_CR_REG_OFFSET, XIIC_CR_REPEATED_START_MASK, XIic_DynSend7BitAddress, XIic_DynSendStop, XIIC_INTR_RX_FULL_MASK, XIIC_INTR_TX_ERROR_MASK, XIic_IntrGlobalDisable, XIic_IntrGlobalEnable, XIIC_READ_OPERATION, XIic_ReadReg, XIIC_RFD_REG_OFFSET, and XIic_WriteReg.

Referenced by DynEepromReadData().

int XIic_DynMasterSend ( XIic InstancePtr,
u8 *  TxMsgPtr,
u8  ByteCount 
)

This function sends data as a Dynamic master on the IIC bus.

If the bus is busy, it will indicate so and then enable an interrupt such that the status handler will be called when the bus is no longer busy. The slave address is sent by using XIic_DynSend7BitAddress().

Parameters
InstancePtrpoints to the Iic instance to be worked on.
TxMsgPtrpoints to the data to be transmitted.
ByteCountis the number of message bytes to be sent.
Returns
XST_SUCCESS if successful else XST_FAILURE.
Note
None.

References XIic::AddrOfSlave, XIic::BaseAddress, XIic::IsDynamic, XIicStats::RepeatedStarts, XIic::SendBufferPtr, XIic::SendByteCount, XIic::Stats, XIic::TxAddrMode, XIIC_CR_DIR_IS_TX_MASK, XIIC_CR_MSMS_MASK, XIIC_CR_NO_ACK_MASK, XIIC_CR_REG_OFFSET, XIic_DynSend7BitAddress, XIIC_INTR_TX_EMPTY_MASK, XIIC_INTR_TX_ERROR_MASK, XIIC_INTR_TX_HALF_MASK, XIic_IntrGlobalDisable, XIic_IntrGlobalEnable, XIIC_MASTER_ROLE, XIic_ReadReg, XIIC_WRITE_OPERATION, and XIic_WriteReg.

Referenced by DynEepromWriteData().

unsigned XIic_DynRecv ( UINTPTR  BaseAddress,
u8  Address,
u8 *  BufferPtr,
u8  ByteCount 
)

Receive data as a master on the IIC bus.

This function receives the data using polled I/O and blocks until the data has been received. It only supports 7 bit addressing. This function returns zero if bus is busy.

Parameters
BaseAddresscontains the base address of the IIC Device.
Addresscontains the 7 bit IIC Device address of the device to send the specified data to.
BufferPtrpoints to the data to be sent.
ByteCountis the number of bytes to be sent. This value can't be greater than 255 and needs to be greater than 0.
Returns
The number of bytes received.
Note
Upon entry to this function, the IIC interface needs to be already enabled in the CR register.

References XIic_ClearIisr, XIic_DynSend7BitAddress, XIic_DynSendStop, XIIC_INTR_ARB_LOST_MASK, XIIC_INTR_BNB_MASK, XIIC_INTR_TX_EMPTY_MASK, XIIC_INTR_TX_ERROR_MASK, XIIC_READ_OPERATION, XIic_ReadReg, XIIC_SR_BUS_BUSY_MASK, XIIC_SR_REG_OFFSET, and XIic_WaitBusFree().

unsigned XIic_DynSend ( UINTPTR  BaseAddress,
u16  Address,
u8 *  BufferPtr,
u8  ByteCount,
u8  Option 
)

Send data as a master on the IIC bus.

This function sends the data using polled I/O and blocks until the data has been sent. It only supports 7 bit addressing. This function returns zero if bus is busy.

Parameters
BaseAddresscontains the base address of the IIC Device.
Addresscontains the 7 bit IIC address of the device to send the specified data to.
BufferPtrpoints to the data to be sent.
ByteCountis the number of bytes to be sent.
Option,:XIIC_STOP = end with STOP condition, XIIC_REPEATED_START = don't end with STOP condition.
Returns
The number of bytes sent.
Note
None.

References XIic_ClearIisr, XIic_DynSend7BitAddress, XIic_DynSendStartStopAddress, XIIC_INTR_ARB_LOST_MASK, XIIC_INTR_BNB_MASK, XIIC_INTR_TX_EMPTY_MASK, XIIC_INTR_TX_ERROR_MASK, XIic_ReadReg, XIIC_SR_BUS_BUSY_MASK, XIIC_SR_REG_OFFSET, XIIC_TX_DYN_STOP_MASK, XIic_WaitBusFree(), and XIIC_WRITE_OPERATION.

Referenced by EepromWriteByte().

u16 XIic_GetAddress ( XIic InstancePtr,
int  AddressType 
)

This function gets the addresses for the IIC device driver.

The addresses include the device address that the device responds to as a slave, or the slave address to communicate with on the bus. The address returned has the same format whether 7 or 10 bits.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
AddressTypeindicates which address, the address which this responds to on the IIC bus as a slave, or the slave address to communicate with when this device is a master. One of the following values must be contained in this argument.
  XII_ADDR_TO_SEND_TYPE Slave being addressed as a master
  XII_ADDR_TO_RESPOND_TYPE      Slave address to respond to as a slave
If neither of the two valid arguments are used, the function returns the address of the slave device
Returns
The address retrieved.
Note
None.

References XIic::AddrOfSlave, XIic::BaseAddress, XIic::Has10BitAddr, XII_ADDR_TO_RESPOND_TYPE, XIIC_ADR_REG_OFFSET, XIic_ReadReg, and XIIC_TBA_REG_OFFSET.

int XIic_GetGpOutput ( XIic InstancePtr,
u8 *  OutputValuePtr 
)

This function gets the contents of the General Purpose Output register for the IIC device driver.

Note that the number of bits in this register is parameterizable in the hardware such that it may not exist. This function checks to ensure that it does exist to prevent bus errors.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
OutputValuePtrcontains the value which was read from the register.
Returns
  • XST_SUCCESS if the given data is read from the GPO register.
    • XST_NO_FEATURE if the hardware is configured such that this register does not contain any bits to read or write.

The OutputValuePtr is also an output as it contains the value read.

Note
None.

References XIic::BaseAddress, XIic::GpOutWidth, XIIC_GPO_REG_OFFSET, and XIic_ReadReg.

u32 XIic_GetOptions ( XIic InstancePtr)

This function gets the current options for the IIC device.

Options control the how the device behaves on the IIC bus. See SetOptions for more information on options.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
Returns
The options of the IIC device. See xiic.h for a list of available options.
Note

Options enabled will have a 1 in its appropriate bit position.

References XIic::Options.

void XIic_GetStats ( XIic InstancePtr,
XIicStats StatsPtr 
)

Gets a copy of the statistics for an IIC device.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
StatsPtris a pointer to a XIicStats structure which will get a copy of current statistics.
Returns
None.
Note
None.

References XIic::IsReady, and XIic::Stats.

int XIic_Initialize ( XIic InstancePtr,
u16  DeviceId 
)

Initializes a specific XIic instance.

The initialization entails:

  • Check the device has an entry in the configuration table.
  • Initialize the driver to allow access to the device registers and initialize other subcomponents necessary for the operation of the device.
  • Default options to:
    • 7-bit slave addressing
    • Send messages as a slave device
    • Repeated start off
    • General call recognition disabled
  • Clear messageing and error statistics

The XIic_Start() function must be called after this function before the device is ready to send and receive data on the IIC bus.

Before XIic_Start() is called, the interrupt control must connect the ISR routine to the interrupt handler. This is done by the user, and not XIic_Start() to allow the user to use an interrupt controller of their choice.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
DeviceIdis the unique id of the device controlled by this XIic instance. Passing in a device id associates the generic XIic instance to a specific device, as chosen by the caller or application developer.
Returns
  • XST_SUCCESS when successful
  • XST_DEVICE_NOT_FOUND indicates the given device id isn't found
  • XST_DEVICE_IS_STARTED indicates the device is started (i.e. interrupts enabled and messaging is possible). Must stop before re-initialization is allowed.
Note
None.

References XIic_Config::BaseAddress, XIic_CfgInitialize(), and XIic_LookupConfig().

void XIic_InterruptHandler ( void *  InstancePtr)

This function is the interrupt handler for the XIic driver.

This function should be connected to the interrupt system.

Only one interrupt source is handled for each interrupt allowing higher priority system interrupts quicker response time.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
Returns
None.

References XIicStats::ArbitrationLost, XIic::BaseAddress, XIic::BNBOnly, XIicStats::IicInterrupts, XIicStats::RecvInterrupts, XIic::SendCallBackRef, XIic::SendHandler, XIicStats::SendInterrupts, XIic::Stats, XIicStats::TxErrors, XIIC_INTR_AAS_MASK, XIIC_INTR_ARB_LOST_MASK, XIIC_INTR_BNB_MASK, XIIC_INTR_NAAS_MASK, XIIC_INTR_RX_FULL_MASK, XIIC_INTR_TX_EMPTY_MASK, XIIC_INTR_TX_ERROR_MASK, XIIC_INTR_TX_HALF_MASK, XIic_IsIntrGlobalEnabled, XIic_ReadIier, XIic_ReadIisr, XIic_ReadReg, XIIC_SR_ADDR_AS_SLAVE_MASK, XIIC_SR_REG_OFFSET, and XIic_WriteIisr.

u32 XIic_IsSlave ( XIic InstancePtr)

A function to determine if the device is currently addressed as a slave.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
Returns
  • TRUE if the device is addressed as slave.
  • FALSE if the device is NOT addressed as slave.
Note
None.

References XIic::BaseAddress, XIic_ReadReg, XIIC_SR_ADDR_AS_SLAVE_MASK, and XIIC_SR_REG_OFFSET.

XIic_Config * XIic_LookupConfig ( u16  DeviceId)

Looks up the device configuration based on the unique device ID.

The table IicConfigTable contains the configuration info for each device in the system.

Parameters
DeviceIdis the unique device ID to look for
Returns
A pointer to the configuration data of the device, or NULL if no match is found.
Note
None.

References XIic_ConfigTable.

Referenced by IicDynEepromExample(), IicEepromExample(), IicMultiMasterExample(), IicRepeatedStartExample(), IicSelfTestExample(), IicSlaveExample(), IicTenBitAddrExample(), TempSensorExample(), and XIic_Initialize().

int XIic_MasterRecv ( XIic InstancePtr,
u8 *  RxMsgPtr,
int  ByteCount 
)

This function receives data as a master from a slave device on the IIC bus.

If the bus is busy, it will indicate so and then enable an interrupt such that the status handler will be called when the bus is no longer busy. The slave address which has been set with the XIic_SetAddress() function is the address from which data is received. Receiving data on the bus performs a read operation.

Parameters
InstancePtris a pointer to the Iic instance to be worked on.
RxMsgPtris a pointer to the data to be transmitted
ByteCountis the number of message bytes to be sent
Returns
  • XST_SUCCESS indicates the message reception processes has been initiated.
  • XST_IIC_BUS_BUSY indicates the bus was in use and that the BusNotBusy interrupt is enabled which will update the EventStatus when the bus is no longer busy.
  • XST_IIC_GENERAL_CALL_ADDRESS indicates the slave address is set to the the general call address. This is not allowed for Master receive mode.

References XIic::AddrOfSlave, XIic::BaseAddress, IIC_RX_FIFO_DEPTH, XIic::IsDynamic, XIic::Options, XIic::RecvBufferPtr, XIic::RecvByteCount, XIicStats::RepeatedStarts, XIic::SendBufferPtr, XIic::Stats, XIic::TxAddrMode, XIIC_CR_MSMS_MASK, XIIC_CR_REG_OFFSET, XIIC_CR_REPEATED_START_MASK, XIIC_INTR_RX_FULL_MASK, XIIC_INTR_TX_EMPTY_MASK, XIIC_INTR_TX_ERROR_MASK, XIic_IntrGlobalDisable, XIic_IntrGlobalEnable, XIIC_READ_OPERATION, XIic_ReadReg, XIIC_RFD_REG_OFFSET, XIIC_WRITE_OPERATION, and XIic_WriteReg.

Referenced by EepromReadData(), and TempSensorExample().

int XIic_MasterSend ( XIic InstancePtr,
u8 *  TxMsgPtr,
int  ByteCount 
)

This function sends data as a master on the IIC bus.

If the bus is busy, it will indicate so and then enable an interrupt such that the status handler will be called when the bus is no longer busy. The slave address which has been set with the XIic_SetAddress() function is the address to which the specific data is sent. Sending data on the bus performs a write operation.

Parameters
InstancePtrpoints to the Iic instance to be worked on.
TxMsgPtrpoints to the data to be transmitted.
ByteCountis the number of message bytes to be sent.
Returns
  • XST_SUCCESS indicates the message transmission has been initiated.
  • XST_IIC_BUS_BUSY indicates the bus was in use and that the BusNotBusy interrupt is enabled which will update the EventStatus when the bus is no longer busy.
Note
None.

References XIic::AddrOfSlave, XIic::BaseAddress, XIic::IsDynamic, XIic::Options, XIic::RecvBufferPtr, XIicStats::RepeatedStarts, XIic::SendBufferPtr, XIic::SendByteCount, XIic::Stats, XIic::TxAddrMode, XIIC_CR_DIR_IS_TX_MASK, XIIC_CR_MSMS_MASK, XIIC_CR_NO_ACK_MASK, XIIC_CR_REG_OFFSET, XIIC_CR_REPEATED_START_MASK, XIIC_INTR_TX_EMPTY_MASK, XIIC_INTR_TX_ERROR_MASK, XIIC_INTR_TX_HALF_MASK, XIic_IntrGlobalDisable, XIic_IntrGlobalEnable, XIIC_MASTER_ROLE, XIic_ReadReg, XIIC_WRITE_OPERATION, and XIic_WriteReg.

Referenced by DynEepromWriteData(), EepromWriteData(), and IicMultiMasterExample().

void XIic_MultiMasterInclude ( void  )

This function includes multi-master code such that multi-master events are handled properly.

Multi-master events include a loss of arbitration and the bus transitioning from busy to not busy. This function allows the multi-master processing to be optional. This function must be called prior to allowing any multi-master events to occur, such as after the driver is initialized.

Returns
None.
Note
None.

Referenced by IicMultiMasterExample().

unsigned XIic_Recv ( UINTPTR  BaseAddress,
u8  Address,
u8 *  BufferPtr,
unsigned  ByteCount,
u8  Option 
)

Receive data as a master on the IIC bus.

This function receives the data using polled I/O and blocks until the data has been received. It only supports 7 bit addressing mode of operation. This function returns zero if bus is busy.

Parameters
BaseAddresscontains the base address of the IIC device.
Addresscontains the 7 bit IIC address of the device to send the specified data to.
BufferPtrpoints to the data to be sent.
ByteCountis the number of bytes to be sent.
Optionindicates whether to hold or free the bus after reception of data, XIIC_STOP = end with STOP condition, XIIC_REPEATED_START = don't end with STOP condition.
Returns
The number of bytes received.
Note
None.

References XIic_ClearIisr, XIIC_CR_DIR_IS_TX_MASK, XIIC_CR_ENABLE_DEVICE_MASK, XIIC_CR_MSMS_MASK, XIIC_CR_NO_ACK_MASK, XIIC_CR_REG_OFFSET, XIIC_CR_REPEATED_START_MASK, XIIC_INTR_ARB_LOST_MASK, XIIC_INTR_BNB_MASK, XIIC_INTR_RX_FULL_MASK, XIIC_INTR_TX_ERROR_MASK, XIIC_READ_OPERATION, XIic_ReadReg, XIIC_RFD_REG_OFFSET, XIic_Send7BitAddress, XIIC_SR_BUS_BUSY_MASK, XIIC_SR_REG_OFFSET, XIic_WaitBusFree(), and XIic_WriteReg.

Referenced by EepromReadByte(), and LowLevelTempSensorExample().

void XIic_Reset ( XIic InstancePtr)

Resets the IIC device.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
Returns
None.
Note
The complete IIC core is Reset on giving a software reset to the IIC core. Some previous versions of the core only reset the Interrupt Logic/Registers, please refer to the HW specification for further details about this.

References XIic::BaseAddress, XIic::IsReady, XIIC_RESET_MASK, XIIC_RESETR_OFFSET, and XIic_WriteReg.

Referenced by XIic_CfgInitialize(), and XIic_SelfTest().

int XIic_SelfTest ( XIic InstancePtr)

Runs a limited self-test on the driver/device.

This test does a read/write test of the Interrupt Registers There is no loopback capabilities for the device such that this test does not send or receive data.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
Returns
  • XST_SUCCESS if no errors are found
  • XST_FAILURE if errors are found
Note
None.

References XIic::BaseAddress, XIic::IsReady, XIic_IntrGlobalEnable, XIic_IsIntrGlobalEnabled, XIic_ReadIier, XIic_Reset(), XIIC_TX_RX_INTERRUPTS, and XIic_WriteIier.

Referenced by IicSelfTestExample().

unsigned XIic_Send ( UINTPTR  BaseAddress,
u8  Address,
u8 *  BufferPtr,
unsigned  ByteCount,
u8  Option 
)

Send data as a master on the IIC bus.

This function sends the data using polled I/O and blocks until the data has been sent. It only supports 7 bit addressing mode of operation. This function returns zero if bus is busy.

Parameters
BaseAddresscontains the base address of the IIC device.
Addresscontains the 7 bit IIC address of the device to send the specified data to.
BufferPtrpoints to the data to be sent.
ByteCountis the number of bytes to be sent.
Optionindicates whether to hold or free the bus after transmitting the data.
Returns
The number of bytes sent.
Note
None.

References XIic_ClearIisr, XIIC_CR_DIR_IS_TX_MASK, XIIC_CR_ENABLE_DEVICE_MASK, XIIC_CR_MSMS_MASK, XIIC_CR_REG_OFFSET, XIIC_CR_REPEATED_START_MASK, XIIC_INTR_ARB_LOST_MASK, XIIC_INTR_BNB_MASK, XIIC_INTR_TX_EMPTY_MASK, XIIC_INTR_TX_ERROR_MASK, XIic_ReadReg, XIic_Send7BitAddress, XIIC_SR_ADDR_AS_SLAVE_MASK, XIIC_SR_BUS_BUSY_MASK, XIIC_SR_REG_OFFSET, XIic_WaitBusFree(), XIIC_WRITE_OPERATION, and XIic_WriteReg.

Referenced by EepromReadByte(), and EepromWriteByte().

int XIic_SetAddress ( XIic InstancePtr,
int  AddressType,
int  Address 
)

This function sets the bus addresses.

The addresses include the device address that the device responds to as a slave, or the slave address to communicate with on the bus. The IIC device hardware is built to allow either 7 or 10 bit slave addressing only at build time rather than at run time. When this device is a master, slave addressing can be selected at run time to match addressing modes for other bus devices.

Addresses are represented as hex values with no adjustment for the data direction bit as the software manages address bit placement. Example: For a 7 address written to the device of 1010 011X where X is the transfer direction (send/recv), the address parameter for this function needs to be 01010011 or 0x53 where the correct bit alllignment will be handled for 7 as well as 10 bit devices. This is especially important as the bit placement is not handled the same depending on which options are used such as repeated start.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
AddressTypeindicates which address is being modified, the address which this device responds to on the IIC bus as a slave, or the slave address to communicate with when this device is a master. One of the following values must be contained in this argument.
  XII_ADDR_TO_SEND_TYPE Slave being addressed by a this master
  XII_ADDR_TO_RESPOND_TYPE      Address to respond to as a slave device
Addresscontains the address to be set, 7 bit or 10 bit address. A ten bit address must be within the range: 0 - 1023 and a 7 bit address must be within the range 0 - 127.
Returns
  • XST_SUCCESS is returned if the address was successfully set.
  • XST_IIC_NO_10_BIT_ADDRESSING indicates only 7 bit addressing supported.
  • XST_INVALID_PARAM indicates an invalid parameter was specified.
Note

Upper bits of 10-bit address is written only when current device is built as a ten bit device.

References XIic::AddrOfSlave, XIic::BaseAddress, XIic::Has10BitAddr, XII_ADDR_TO_RESPOND_TYPE, XII_ADDR_TO_SEND_TYPE, XIIC_ADR_REG_OFFSET, XIIC_TBA_REG_OFFSET, and XIic_WriteReg.

Referenced by IicDynEepromExample(), IicEepromExample(), IicMultiMasterExample(), IicRepeatedStartExample(), IicSlaveExample(), IicTenBitAddrExample(), and TempSensorExample().

int XIic_SetGpOutput ( XIic InstancePtr,
u8  OutputValue 
)

This function sets the contents of the General Purpose Output register for the IIC device driver.

Note that the number of bits in this register is parameterizable in the hardware such that it may not exist. This function checks to ensure that it does exist to prevent bus errors, but does not ensure that the number of bits in the register are sufficient for the value being written (won't cause a bus error).

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
OutputValuecontains the value to be written to the register.
Returns
  • XST_SUCCESS if the given data is written to the GPO register.
    • XST_NO_FEATURE if the hardware is configured such that this register does not contain any bits to read or write.
Note
None.

References XIic::BaseAddress, XIic::GpOutWidth, XIIC_GPO_REG_OFFSET, and XIic_WriteReg.

void XIic_SetOptions ( XIic InstancePtr,
u32  NewOptions 
)

This function sets the options for the IIC device driver.

The options control how the device behaves relative to the IIC bus. If an option applies to how messages are sent or received on the IIC bus, it must be set prior to calling functions which send or receive data.

To set multiple options, the values must be ORed together. To not change existing options, read/modify/write with the current options using XIic_GetOptions().

USAGE EXAMPLE:

Read/modify/write to enable repeated start:

  u8 Options;
  Options = XIic_GetOptions(&Iic);
  XIic_SetOptions(&Iic, Options | XII_REPEATED_START_OPTION);

Disabling General Call:

  Options = XIic_GetOptions(&Iic);
  XIic_SetOptions(&Iic, Options &= ~XII_GENERAL_CALL_OPTION);
Parameters
InstancePtris a pointer to the XIic instance to be worked on.
NewOptionsare the options to be set. See xiic.h for a list of the available options.
Returns
None.
Note

Sending or receiving messages with repeated start enabled, and then disabling repeated start, will not take effect until another master transaction is completed. i.e. After using repeated start, the bus will continue to be throttled after repeated start is disabled until a master transaction occurs allowing the IIC to release the bus.

Options enabled will have a 1 in its appropriate bit position.

References XIic::BaseAddress, XIic::Options, XII_GENERAL_CALL_OPTION, XIIC_CR_GENERAL_CALL_MASK, XIIC_CR_REG_OFFSET, XIic_IntrGlobalDisable, XIic_IntrGlobalEnable, XIic_ReadReg, and XIic_WriteReg.

Referenced by IicTenBitAddrExample().

void XIic_SetRecvHandler ( XIic InstancePtr,
void *  CallBackRef,
XIic_Handler  FuncPtr 
)

Sets the receive callback function, the receive handler, which the driver calls when it finishes receiving data.

The number of bytes used to signal when the receive is complete is the number of bytes set in the XIic_Recv function.

The handler executes in an interrupt context such that it must minimize the amount of processing performed such as transferring data to a thread context.

The number of bytes received is passed to the handler as an argument.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
CallBackRefis the upper layer callback reference passed back when the callback function is invoked.
FuncPtris the pointer to the callback function.
Returns
None.
Note
The handler is called within interrupt context .

References XIic::IsReady, XIic::RecvCallBackRef, and XIic::RecvHandler.

Referenced by IicDynEepromExample(), IicEepromExample(), IicRepeatedStartExample(), IicSlaveExample(), IicTenBitAddrExample(), and TempSensorExample().

void XIic_SetSendHandler ( XIic InstancePtr,
void *  CallBackRef,
XIic_Handler  FuncPtr 
)

Sets the send callback function, the send handler, which the driver calls when it receives confirmation of sent data.

The handler executes in an interrupt context such that it must minimize the amount of processing performed such as transferring data to a thread context.

Parameters
InstancePtrthe pointer to the XIic instance to be worked on.
CallBackRefthe upper layer callback reference passed back when the callback function is invoked.
FuncPtrthe pointer to the callback function.
Returns
None.
Note
The handler is called within interrupt context .

References XIic::IsReady, XIic::SendCallBackRef, and XIic::SendHandler.

Referenced by IicDynEepromExample(), IicEepromExample(), IicMultiMasterExample(), IicRepeatedStartExample(), IicSlaveExample(), and IicTenBitAddrExample().

void XIic_SetStatusHandler ( XIic InstancePtr,
void *  CallBackRef,
XIic_StatusHandler  FuncPtr 
)

Sets the status callback function, the status handler, which the driver calls when it encounters conditions which are not data related.

The handler executes in an interrupt context such that it must minimize the amount of processing performed such as transferring data to a thread context. The status events that can be returned are described in xiic.h.

Parameters
InstancePtrpoints to the XIic instance to be worked on.
CallBackRefis the upper layer callback reference passed back when the callback function is invoked.
FuncPtris the pointer to the callback function.
Returns
None.
Note
The handler is called within interrupt context .

References XIic::IsReady, XIic::StatusCallBackRef, and XIic::StatusHandler.

Referenced by IicDynEepromExample(), IicEepromExample(), IicMultiMasterExample(), IicRepeatedStartExample(), IicSlaveExample(), IicTenBitAddrExample(), and TempSensorExample().

void XIic_SlaveInclude ( void  )

This function includes slave code such that slave events will be processed.

It is necessary to allow slave code to be optional to reduce the size of the driver. This function may be called at any time but must be prior to being selected as a slave on the IIC bus. This function may be called prior to the Cfg_Initialize() function and must be called before any functions in this file are called.

Returns
None.
Note
None.

Referenced by IicSlaveExample(), and IicTenBitAddrExample().

int XIic_SlaveRecv ( XIic InstancePtr,
u8 *  RxMsgPtr,
int  ByteCount 
)

This function sends data as a slave on the IIC bus and should not be called until an event has occurred that indicates the device has been selected by a master attempting read from the slave (XII_MASTER_READ_EVENT).

If more data is received than specified a No Acknowledge will be sent to signal the Master to stop sending data. Any received data is read to prevent the slave device from throttling the bus.

Parameters
InstancePtris a pointer to the Iic instance to be worked on.
RxMsgPtris a pointer to the data to be transmitted.
ByteCountis the number of message bytes to be sent.
Returns
  • XST_SUCCESS indicates the message transmission has been initiated.
  • XST_IIC_NOT_SLAVE indicates the device has not been selected to be a slave on the IIC bus such that data cannot be received.

References XIic::BaseAddress, IIC_RX_FIFO_DEPTH, XIic::RecvBufferPtr, XIic::RecvByteCount, XIic::SendBufferPtr, XIIC_INTR_RX_FULL_MASK, XIic_IntrGlobalDisable, XIic_IntrGlobalEnable, XIic_ReadReg, XIIC_RFD_REG_OFFSET, XIIC_SR_ADDR_AS_SLAVE_MASK, XIIC_SR_REG_OFFSET, and XIic_WriteReg.

Referenced by SlaveReadData(), and TenBitAddrReadData().

int XIic_SlaveSend ( XIic InstancePtr,
u8 *  TxMsgPtr,
int  ByteCount 
)

This function sends data as a slave on the IIC bus and should not be called until an event has occurred that indicates the device has been selected by a master attempting read from the slave (XII_MASTER_READ_EVENT).

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
TxMsgPtris a pointer to the data to be transmitted.
ByteCountis the number of message bytes to be sent.
Returns
  • XST_SUCCESS indicates the message transmission has been initiated.
  • XST_IIC_NOT_SLAVE indicates the device has not been selected to be a slave on the IIC bus such that data cannot be sent.
Note
None.

References XIic::BaseAddress, XIic::RecvBufferPtr, XIic::SendBufferPtr, XIic::SendByteCount, XIIC_INTR_TX_EMPTY_MASK, XIIC_INTR_TX_ERROR_MASK, XIIC_INTR_TX_HALF_MASK, XIic_IntrGlobalDisable, XIic_IntrGlobalEnable, XIic_ReadReg, XIIC_SLAVE_ROLE, XIIC_SR_ADDR_AS_SLAVE_MASK, and XIIC_SR_REG_OFFSET.

Referenced by SlaveWriteData(), and TenBitAddrWriteData().

int XIic_Start ( XIic InstancePtr)

This function starts the IIC device and driver by enabling the proper interrupts such that data may be sent and received on the IIC bus.

This function must be called before the functions to send and receive data.

Before XIic_Start() is called, the interrupt control must connect the ISR routine to the interrupt handler. This is done by the user, and not XIic_Start() to allow the user to use an interrupt controller of their choice.

Start enables:

  • IIC device
  • Interrupts:
    • Addressed as slave to allow messages from another master
    • Arbitration Lost to detect Tx arbitration errors
    • Global IIC interrupt
Parameters
InstancePtris a pointer to the XIic instance to be worked on.
Returns
XST_SUCCESS always.
Note

The device interrupt is connected to the interrupt controller, but no "messaging" interrupts are enabled. Addressed as Slave is enabled to reception of messages when this devices address is written to the bus. The correct messaging interrupts are enabled when sending or receiving via the IicSend() and IicRecv() functions. No action is required by the user to control any IIC interrupts as the driver completely manages all 8 interrupts. Start and Stop control the ability to use the device. Stopping the device completely stops all device interrupts from the processor.

References XIic::BaseAddress, XIic::IsDynamic, XIic::IsReady, XIic::IsStarted, XIIC_CR_ENABLE_DEVICE_MASK, XIIC_CR_REG_OFFSET, XIIC_INTR_AAS_MASK, XIIC_INTR_ARB_LOST_MASK, XIic_IntrGlobalEnable, XIIC_RFD_REG_OFFSET, XIic_WriteIier, and XIic_WriteReg.

Referenced by DynEepromReadData(), DynEepromWriteData(), EepromReadData(), EepromWriteData(), IicMultiMasterExample(), SlaveReadData(), SlaveWriteData(), TempSensorExample(), TenBitAddrReadData(), and TenBitAddrWriteData().

int XIic_Stop ( XIic InstancePtr)

This function stops the IIC device and driver such that data is no longer sent or received on the IIC bus.

This function stops the device by disabling interrupts. This function only disables interrupts within the device such that the caller is responsible for disconnecting the interrupt handler of the device from the interrupt source and disabling interrupts at other levels.

Due to bus throttling that could hold the bus between messages when using repeated start option, stop will not occur when the device is actively sending or receiving data from the IIC bus or the bus is being throttled by this device, but instead return XST_IIC_BUS_BUSY.

Parameters
InstancePtris a pointer to the XIic instance to be worked on.
Returns
  • XST_SUCCESS indicates all IIC interrupts are disabled. No messages can be received or transmitted until XIic_Start() is called.
  • XST_IIC_BUS_BUSY indicates this device is currently engaged in message traffic and cannot be stopped.
Note
None.

References XIic::BaseAddress, XIic::IsStarted, XIIC_CR_MSMS_MASK, XIIC_CR_REG_OFFSET, XIic_IntrGlobalDisable, XIic_IntrGlobalEnable, XIic_ReadReg, XIIC_SR_ADDR_AS_SLAVE_MASK, and XIIC_SR_REG_OFFSET.

Referenced by DynEepromReadData(), DynEepromWriteData(), EepromReadData(), EepromWriteData(), IicMultiMasterExample(), SlaveReadData(), SlaveWriteData(), TenBitAddrReadData(), and TenBitAddrWriteData().

u32 XIic_WaitBusFree ( UINTPTR  BaseAddress)

This function will wait until the I2C bus is free or timeout.

Parameters
BaseAddresscontains the base address of the I2C device.
Returns
  • XST_SUCCESS if the I2C bus was freed before the timeout.
  • XST_FAILURE otherwise.
Note
None.

Referenced by XIic_DynRecv(), XIic_DynSend(), XIic_Recv(), and XIic_Send().

Variable Documentation

XIic_Config XIic_ConfigTable[XPAR_XIIC_NUM_INSTANCES]
Initial value:
= {
{
XPAR_IIC_0_DEVICE_ID,
XPAR_IIC_0_BASEADDR,
XPAR_IIC_0_TEN_BIT_ADR,
XPAR_IIC_0_GPO_WIDTH
}
,
{
XPAR_IIC_1_DEVICE_ID,
XPAR_IIC_1_BASEADDR,
XPAR_IIC_1_TEN_BIT_ADR,
XPAR_IIC_1_GPO_WIDTH
}
}

The IIC configuration table, sized by the number of instances defined in xparameters.h.

Referenced by XIic_LookupConfig().

XIic_Config XIic_ConfigTable[]

The IIC configuration table, sized by the number of instances defined in xparameters.h.

Referenced by XIic_LookupConfig().