Data Structures
struct	XUartNs550_Config
	This typedef contains configuration information for the device. More...

struct	XUartNs550Buffer
	The following data type is used to manage the buffers that are handled when sending and receiving data in the interrupt mode. More...

struct	XUartNs550Format
	This data type allows the data format of the device to be set and retrieved. More...

struct	XUartNs550Stats
	UART statistics. More...

struct	XUartNs550
	The XUartNs550 driver instance data. More...

Macros
#define	XUartNs550_ReadReg(BaseAddress, RegOffset) Xil_In32((BaseAddress) + (RegOffset))
	Read a UART register. More...

#define	XUartNs550_WriteReg(BaseAddress, RegOffset, RegisterValue) Xil_Out32((BaseAddress) + (RegOffset), (RegisterValue))
	Write to a UART register. More...

#define	XUartNs550_GetLineStatusReg(BaseAddress) XUartNs550_ReadReg((BaseAddress), XUN_LSR_OFFSET)
	Get the UART Line Status Register. More...

#define	XUartNs550_GetLineControlReg(BaseAddress) XUartNs550_ReadReg((BaseAddress), XUN_LCR_OFFSET)
	Get the UART Line Status Register. More...

#define	XUartNs550_SetLineControlReg(BaseAddress, RegisterValue) XUartNs550_WriteReg((BaseAddress), XUN_LCR_OFFSET, (RegisterValue))
	Set the UART Line Status Register. More...

#define	XUartNs550_EnableIntr(BaseAddress)
	Enable the transmit and receive interrupts of the UART. More...

#define	XUartNs550_DisableIntr(BaseAddress)
	Disable the transmit and receive interrupts of the UART. More...

#define	XUartNs550_IsReceiveData(BaseAddress) (XUartNs550_GetLineStatusReg(BaseAddress) & XUN_LSR_DATA_READY)
	Determine if there is receive data in the receiver and/or FIFO. More...

#define	XUartNs550_IsTransmitEmpty(BaseAddress) (XUartNs550_GetLineStatusReg(BaseAddress) & XUN_LSR_TX_BUFFER_EMPTY)
	Determine if a byte of data can be sent with the transmitter. More...

Typedefs
typedef void(*	XUartNs550_Handler )(void *CallBackRef, u32 Event, unsigned int EventData)
	This data type defines a handler which the application must define when using interrupt mode. More...

Functions
int	XUartNs550_CfgInitialize (XUartNs550 InstancePtr, XUartNs550_Config Config, UINTPTR EffectiveAddr)
	Initializes a specific XUartNs550 instance such that it is ready to be used. More...

unsigned int	XUartNs550_Send (XUartNs550 InstancePtr, u8 BufferPtr, unsigned int NumBytes)
	This functions sends the specified buffer of data using the UART in either polled or interrupt driven modes. More...

unsigned int	XUartNs550_Recv (XUartNs550 InstancePtr, u8 BufferPtr, unsigned int NumBytes)
	This function will attempt to receive a specified number of bytes of data from the UART and store it into the specified buffer. More...

unsigned int	XUartNs550_SendBuffer (XUartNs550 *InstancePtr)
	This function sends a buffer that has been previously specified by setting up the instance variables of the instance. More...

unsigned int	XUartNs550_ReceiveBuffer (XUartNs550 *InstancePtr)
	This function receives a buffer that has been previously specified by setting up the instance variables of the instance. More...

int	XUartNs550_Initialize (XUartNs550 *InstancePtr, u16 DeviceId)
	Initializes a specific XUartNs550 instance such that it is ready to be used. More...

XUartNs550_Config *	XUartNs550_LookupConfig (u16 DeviceId)
	Looks up the device configuration based on the unique device ID. More...

int	XUartNs550_SetOptions (XUartNs550 *InstancePtr, u16 Options)
	Sets the options for the specified driver instance. More...

u16	XUartNs550_GetOptions (XUartNs550 *InstancePtr)
	Gets the options for the specified driver instance. More...

int	XUartNs550_SetFifoThreshold (XUartNs550 *InstancePtr, u8 TriggerLevel)
	This functions sets the receive FIFO trigger level. More...

u8	XUartNs550_GetFifoThreshold (XUartNs550 *InstancePtr)
	This function gets the receive FIFO trigger level. More...

int	XUartNs550_IsSending (XUartNs550 *InstancePtr)
	This function determines if the specified UART is sending data. More...

u8	XUartNs550_GetLastErrors (XUartNs550 *InstancePtr)
	This function returns the last errors that have occurred in the specified UART. More...

u8	XUartNs550_GetModemStatus (XUartNs550 *InstancePtr)
	This function gets the modem status from the specified UART. More...

int	XUartNs550_SetDataFormat (XUartNs550 InstancePtr, XUartNs550Format FormatPtr)
	Sets the data format for the specified UART. More...

void	XUartNs550_GetDataFormat (XUartNs550 InstancePtr, XUartNs550Format FormatPtr)
	Gets the data format for the specified UART. More...

void	XUartNs550_SetHandler (XUartNs550 InstancePtr, XUartNs550_Handler FuncPtr, void CallBackRef)
	This function sets the handler that will be called when an event (interrupt) occurs in the driver. More...

void	XUartNs550_InterruptHandler (XUartNs550 *InstancePtr)
	This function is the interrupt handler for the 16450/16550 UART driver. More...

void	XUartNs550_GetStats (XUartNs550 InstancePtr, XUartNs550Stats StatsPtr)
	This functions returns a snapshot of the current statistics in the area provided. More...

void	XUartNs550_ClearStats (XUartNs550 *InstancePtr)
	This function zeros the statistics for the given instance. More...

int	XUartNs550_SelfTest (XUartNs550 *InstancePtr)
	This functions runs a self-test on the driver and hardware device. More...

void	XUartNs550_SendByte (UINTPTR BaseAddress, u8 Data)
	This function sends a data byte with the UART. More...

u8	XUartNs550_RecvByte (UINTPTR BaseAddress)
	This function receives a byte from the UART. More...

void	XUartNs550_SetBaud (UINTPTR BaseAddress, u32 InputClockHz, u32 BaudRate)
	Set the baud rate for the UART. More...

Variables
XUartNs550_Config	XUartNs550_ConfigTable []
	The configuration table for UART 16550/16450 devices in the table. More...

XUartNs550_Config	XUartNs550_ConfigTable []
	The configuration table for UART 16550/16450 devices in the table. More...

Configuration options
#define	XUN_OPTION_RXLINE_INTR 0x0800
	These constants specify the options that may be set or retrieved with the driver, each is a unique bit mask such that multiple options may be specified. More...

#define	XUN_OPTION_SET_BREAK 0x0400
	Set a break condition. More...

#define	XUN_OPTION_LOOPBACK 0x0200
	Enable local loopback. More...

#define	XUN_OPTION_DATA_INTR 0x0100
	Enable data interrupts. More...

#define	XUN_OPTION_MODEM_INTR 0x0080
	Enable modem interrupts. More...

#define	XUN_OPTION_FIFOS_ENABLE 0x0040
	Enable FIFOs. More...

#define	XUN_OPTION_RESET_TX_FIFO 0x0020
	Reset the transmit FIFO. More...

#define	XUN_OPTION_RESET_RX_FIFO 0x0010
	Reset the receive FIFO. More...

#define	XUN_OPTION_ASSERT_OUT2 0x0008
	Assert out2 signal. More...

#define	XUN_OPTION_ASSERT_OUT1 0x0004
	Assert out1 signal. More...

#define	XUN_OPTION_ASSERT_RTS 0x0002
	Assert RTS signal. More...

#define	XUN_OPTION_ASSERT_DTR 0x0001
	Assert DTR signal. More...

Data format values
#define	XUN_FORMAT_8_BITS 3
	These constants specify the data format that may be set or retrieved with the driver. More...

#define	XUN_FORMAT_7_BITS 2
	7 data bits More...

#define	XUN_FORMAT_6_BITS 1
	6 data bits More...

#define	XUN_FORMAT_5_BITS 0
	5 data bits More...

#define	XUN_FORMAT_EVEN_PARITY 2
	Even Parity. More...

#define	XUN_FORMAT_ODD_PARITY 1
	Odd Parity. More...

#define	XUN_FORMAT_NO_PARITY 0
	No Parity. More...

#define	XUN_FORMAT_2_STOP_BIT 1
	2 stop bits More...

#define	XUN_FORMAT_1_STOP_BIT 0
	1 stop bit More...

FIFO trigger values
#define	XUN_FIFO_TRIGGER_14 0xC0
	14 byte trigger level More...

#define	XUN_FIFO_TRIGGER_08 0x80
	8 byte trigger level More...

#define	XUN_FIFO_TRIGGER_04 0x40
	4 byte trigger level More...

#define	XUN_FIFO_TRIGGER_01 0x00
	1 byte trigger level More...

Modem status values
#define	XUN_MODEM_DCD_DELTA_MASK 0x08
	These constants specify the modem status that may be retrieved from the driver. More...

#define	XUN_MODEM_DSR_DELTA_MASK 0x02
	DSR signal changed state. More...

#define	XUN_MODEM_CTS_DELTA_MASK 0x01
	CTS signal changed state. More...

#define	XUN_MODEM_RINGING_MASK 0x40
	Ring signal is active. More...

#define	XUN_MODEM_DSR_MASK 0x20
	Current state of DSR signal. More...

#define	XUN_MODEM_CTS_MASK 0x10
	Current state of CTS signal. More...

#define	XUN_MODEM_DCD_MASK 0x80
	Current state of DCD signal. More...

#define	XUN_MODEM_RING_STOP_MASK 0x04
	Ringing has stopped. More...

Callback events
#define	XUN_EVENT_RECV_DATA 1
	These constants specify the handler events that are passed to a handler from the driver. More...

#define	XUN_EVENT_RECV_TIMEOUT 2
	A receive timeout occurred. More...

#define	XUN_EVENT_SENT_DATA 3
	Data has been sent. More...

#define	XUN_EVENT_RECV_ERROR 4
	A receive error was detected. More...

#define	XUN_EVENT_MODEM 5
	A change in modem status. More...

Error values
#define	XUN_ERROR_BREAK_MASK 0x10
	These constants specify the errors that may be retrieved from the driver using the XUartNs550_GetLastErrors function. More...

#define	XUN_ERROR_FRAMING_MASK 0x08
	Receive framing error. More...

#define	XUN_ERROR_PARITY_MASK 0x04
	Receive parity error. More...

#define	XUN_ERROR_OVERRUN_MASK 0x02
	Receive overrun error. More...

#define	XUN_ERROR_NONE 0x00
	No error. More...

Register Map
Register offsets for the 16450/16550 compatible UART device.
#define	XUN_RBR_OFFSET (XUN_REG_OFFSET)
	Receive buffer, read only. More...

#define	XUN_THR_OFFSET (XUN_REG_OFFSET)
	Transmit holding register. More...

#define	XUN_IER_OFFSET (XUN_REG_OFFSET + 0x04)
	Interrupt enable. More...

#define	XUN_IIR_OFFSET (XUN_REG_OFFSET + 0x08)
	Interrupt id, read only. More...

#define	XUN_FCR_OFFSET (XUN_REG_OFFSET + 0x08)
	Fifo control, write only. More...

#define	XUN_LCR_OFFSET (XUN_REG_OFFSET + 0x0C)
	Line Control Register. More...

#define	XUN_MCR_OFFSET (XUN_REG_OFFSET + 0x10)
	Modem Control Register. More...

#define	XUN_LSR_OFFSET (XUN_REG_OFFSET + 0x14)
	Line Status Register. More...

#define	XUN_MSR_OFFSET (XUN_REG_OFFSET + 0x18)
	Modem Status Register. More...

#define	XUN_DLL_OFFSET (XUN_REG_OFFSET + 0x00)
	Divisor Register LSB. More...

#define	XUN_DLM_OFFSET (XUN_REG_OFFSET + 0x04)
	Divisor Register MSB. More...

#define	XUN_DRLS_OFFSET (XUN_REG_OFFSET + 0x00)
	Divisor Register LSB. More...

#define	XUN_DRLM_OFFSET (XUN_REG_OFFSET + 0x04)
	Divisor Register MSB. More...

Interrupt Enable Register (IER) mask(s)
#define	XUN_IER_MODEM_STATUS 0x00000008
	Modem status interrupt. More...

#define	XUN_IER_RX_LINE 0x00000004
	Receive status interrupt. More...

#define	XUN_IER_TX_EMPTY 0x00000002
	Transmitter empty interrupt. More...

#define	XUN_IER_RX_DATA 0x00000001
	Receiver data available. More...

Interrupt ID Register (INT_ID) mask(s)
#define	XUN_INT_ID_MASK 0x0000000F
	Only the interrupt ID. More...

#define	XUN_INT_ID_FIFOS_ENABLED 0x000000C0
	Only the FIFOs enable. More...

FIFO Control Register mask(s)
#define	XUN_FIFO_RX_TRIG_MSB 0x00000080
	Trigger level MSB. More...

#define	XUN_FIFO_RX_TRIG_LSB 0x00000040
	Trigger level LSB. More...

#define	XUN_FIFO_TX_RESET 0x00000004
	Reset the transmit FIFO. More...

#define	XUN_FIFO_RX_RESET 0x00000002
	Reset the receive FIFO. More...

#define	XUN_FIFO_ENABLE 0x00000001
	Enable the FIFOs. More...

#define	XUN_FIFO_RX_TRIGGER 0x000000C0
	Both trigger level bits. More...

Line Control Register(LCR) mask(s)
#define	XUN_LCR_DLAB 0x00000080
	Divisor latch access. More...

#define	XUN_LCR_SET_BREAK 0x00000040
	Cause a break condition. More...

#define	XUN_LCR_STICK_PARITY 0x00000020
	Stick Parity. More...

#define	XUN_LCR_EVEN_PARITY 0x00000010
	1 = even, 0 = odd parity More...

#define	XUN_LCR_ENABLE_PARITY 0x00000008
	1 = Enable, 0 = Disable parity More...

#define	XUN_LCR_2_STOP_BITS 0x00000004
	1= 2 stop bits,0 = 1 stop bit More...

#define	XUN_LCR_8_DATA_BITS 0x00000003
	8 Data bits selection More...

#define	XUN_LCR_7_DATA_BITS 0x00000002
	7 Data bits selection More...

#define	XUN_LCR_6_DATA_BITS 0x00000001
	6 Data bits selection More...

#define	XUN_LCR_LENGTH_MASK 0x00000003
	Both length bits mask. More...

#define	XUN_LCR_PARITY_MASK 0x00000018
	Both parity bits mask. More...

Mode Control Register(MCR) mask(s)
#define	XUN_MCR_LOOP 0x00000010
	Local loopback. More...

#define	XUN_MCR_OUT_2 0x00000008
	General output 2 signal. More...

#define	XUN_MCR_OUT_1 0x00000004
	General output 1 signal. More...

#define	XUN_MCR_RTS 0x00000002
	RTS signal. More...

#define	XUN_MCR_DTR 0x00000001
	DTR signal. More...

Line Status Register(LSR) mask(s)
#define	XUN_LSR_RX_FIFO_ERROR 0x00000080
	An errored byte is in FIFO. More...

#define	XUN_LSR_TX_EMPTY 0x00000040
	Transmitter is empty. More...

#define	XUN_LSR_TX_BUFFER_EMPTY 0x00000020
	Transmit holding reg empty. More...

#define	XUN_LSR_BREAK_INT 0x00000010
	Break detected interrupt. More...

#define	XUN_LSR_FRAMING_ERROR 0x00000008
	Framing error on current byte. More...

#define	XUN_LSR_PARITY_ERROR 0x00000004
	Parity error on current byte. More...

#define	XUN_LSR_OVERRUN_ERROR 0x00000002
	Overrun error on receive FIFO. More...

#define	XUN_LSR_DATA_READY 0x00000001
	Receive data ready. More...

#define	XUN_LSR_ERROR_BREAK 0x0000001E
	Errors except FIFO error and break detected. More...

Macro Definition Documentation

#define XUartNs550_DisableIntr ( BaseAddress )

Value:

XUartNs550_WriteReg((BaseAddress), XUN_IER_OFFSET,              \
                        XUartNs550_ReadReg((BaseAddress), XUN_IER_OFFSET) & \
                        ~(XUN_IER_RX_LINE | XUN_IER_TX_EMPTY | XUN_IER_RX_DATA))

Disable the transmit and receive interrupts of the UART.

Parameters

BaseAddress contains the base address of the device.

Returns: None.

Note: C-Style signature: void XUartNs550_DisableIntr(u32 BaseAddress);,

#define XUartNs550_EnableIntr ( BaseAddress )

Value:

XUartNs550_WriteReg((BaseAddress), XUN_IER_OFFSET,              \
                         XUartNs550_ReadReg((BaseAddress), XUN_IER_OFFSET) | \
                         (XUN_IER_RX_LINE | XUN_IER_TX_EMPTY | XUN_IER_RX_DATA))

Enable the transmit and receive interrupts of the UART.

Parameters

BaseAddress contains the base address of the device.

Returns: None.

Note: C-Style signature: void XUartNs550_EnableIntr(u32 BaseAddress);,

#define XUartNs550_GetLineControlReg ( BaseAddress ) XUartNs550_ReadReg((BaseAddress), XUN_LCR_OFFSET)

Get the UART Line Status Register.

Parameters

BaseAddress contains the base address of the device.

Returns: The value read from the register.

Note: C-Style signature: u32 XUartNs550_GetLineControlReg(u32 BaseAddress);

Referenced by XUartNs550_GetDataFormat(), XUartNs550_SetBaud(), and XUartNs550_SetDataFormat().

#define XUartNs550_GetLineStatusReg ( BaseAddress ) XUartNs550_ReadReg((BaseAddress), XUN_LSR_OFFSET)

Get the UART Line Status Register.

Parameters

BaseAddress contains the base address of the device.

Returns: The value read from the register.

Note: C-Style signature: u32 XUartNs550_GetLineStatusReg(u32 BaseAddress);

Referenced by XUartNs550_IsSending(), XUartNs550_ReceiveBuffer(), XUartNs550_SelfTest(), and XUartNs550_SendBuffer().

#define XUartNs550_IsReceiveData ( BaseAddress ) (XUartNs550_GetLineStatusReg(BaseAddress) & XUN_LSR_DATA_READY)

Determine if there is receive data in the receiver and/or FIFO.

Parameters

BaseAddress contains the base address of the device.

Returns: TRUE if there is receive data, FALSE otherwise.

Note: C-Style signature: int XUartNs550_IsReceiveData(u32 BaseAddress);,

Referenced by XUartNs550_RecvByte().

#define XUartNs550_IsTransmitEmpty ( BaseAddress ) (XUartNs550_GetLineStatusReg(BaseAddress) & XUN_LSR_TX_BUFFER_EMPTY)

Determine if a byte of data can be sent with the transmitter.

Parameters

BaseAddress contains the base address of the device.

Returns: TRUE if a byte can be sent, FALSE otherwise.

Note: C-Style signature: int XUartNs550_IsTransmitEmpty(u32 BaseAddress);,

Referenced by XUartNs550_SendByte().

#define XUartNs550_ReadReg	(	BaseAddress,
		RegOffset
	)	Xil_In32((BaseAddress) + (RegOffset))

Read a UART register.

Parameters

BaseAddress	contains the base address of the device.
RegOffset	contains 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 XUartNs550_ReadReg(u32 BaseAddress, u32 RegOffset);

Referenced by XUartNs550_GetModemStatus(), XUartNs550_GetOptions(), XUartNs550_InterruptHandler(), XUartNs550_ReceiveBuffer(), XUartNs550_Recv(), XUartNs550_RecvByte(), XUartNs550_SelfTest(), XUartNs550_Send(), XUartNs550_SendBuffer(), and XUartNs550_SetOptions().

#define XUartNs550_SetLineControlReg	(	BaseAddress,
		RegisterValue
	)	XUartNs550_WriteReg((BaseAddress), XUN_LCR_OFFSET, (RegisterValue))

Set the UART Line Status Register.

Parameters

BaseAddress	contains the base address of the device.
RegisterValue	is the value to be written to the register.

Returns: None.

Note: C-Style signature: void XUartNs550_SetLineControlReg(u32 BaseAddress, u32 RegisterValue);

Referenced by XUartNs550_CfgInitialize(), XUartNs550_LowLevelExample(), XUartNs550_SetBaud(), and XUartNs550_SetDataFormat().

#define XUartNs550_WriteReg	(	BaseAddress,
		RegOffset,
		RegisterValue
	)	Xil_Out32((BaseAddress) + (RegOffset), (RegisterValue))

Write to a UART register.

Parameters

BaseAddress	contains the base address of the device.
RegOffset	contains the offset from the 1st register of the device to select the specific register.
RegisterValue	is the value to be written to the register.

Returns: None.

Note: C-Style signature: u32 XUartNs550_WriteReg(u32 BaseAddress, u32 RegOffset, u32 RegisterValue);

Referenced by XUartNs550_CfgInitialize(), XUartNs550_LowLevelExample(), XUartNs550_Recv(), XUartNs550_SelfTest(), XUartNs550_Send(), XUartNs550_SendBuffer(), XUartNs550_SendByte(), XUartNs550_SetBaud(), XUartNs550_SetFifoThreshold(), and XUartNs550_SetOptions().

#define XUN_DLL_OFFSET (XUN_REG_OFFSET + 0x00)

Divisor Register LSB.

Referenced by XUartNs550_SetBaud().

#define XUN_DLM_OFFSET (XUN_REG_OFFSET + 0x04)

Divisor Register MSB.

Referenced by XUartNs550_SetBaud().

#define XUN_DRLM_OFFSET (XUN_REG_OFFSET + 0x04)

Divisor Register MSB.

#define XUN_DRLS_OFFSET (XUN_REG_OFFSET + 0x00)

Divisor Register LSB.

#define XUN_ERROR_BREAK_MASK 0x10

These constants specify the errors that may be retrieved from the driver using the XUartNs550_GetLastErrors function.

All of them are bit masks, except no error, such that multiple errors may be specified.Break detected

#define XUN_ERROR_FRAMING_MASK 0x08

Receive framing error.

#define XUN_ERROR_NONE 0x00

No error.

#define XUN_ERROR_OVERRUN_MASK 0x02

Receive overrun error.

#define XUN_ERROR_PARITY_MASK 0x04

Receive parity error.

#define XUN_EVENT_MODEM 5

A change in modem status.

#define XUN_EVENT_RECV_DATA 1

These constants specify the handler events that are passed to a handler from the driver.

These constants are not bit masks such that only one will be passed at a time to the handler.Data has been received

Referenced by UartNs550IntrHandler().

#define XUN_EVENT_RECV_ERROR 4

A receive error was detected.

Referenced by UartNs550IntrHandler().

#define XUN_EVENT_RECV_TIMEOUT 2

A receive timeout occurred.

Referenced by UartNs550IntrHandler().

#define XUN_EVENT_SENT_DATA 3

Data has been sent.

Referenced by UartNs550IntrHandler().

#define XUN_FCR_OFFSET (XUN_REG_OFFSET + 0x08)

Fifo control, write only.

Referenced by XUartNs550_CfgInitialize(), XUartNs550_GetOptions(), XUartNs550_LowLevelExample(), XUartNs550_SetFifoThreshold(), and XUartNs550_SetOptions().

#define XUN_FIFO_ENABLE 0x00000001

Enable the FIFOs.

Referenced by XUartNs550_CfgInitialize(), XUartNs550_LowLevelExample(), and XUartNs550_SetFifoThreshold().

#define XUN_FIFO_RX_RESET 0x00000002

Reset the receive FIFO.

#define XUN_FIFO_RX_TRIG_LSB 0x00000040

Trigger level LSB.

#define XUN_FIFO_RX_TRIG_MSB 0x00000080

Trigger level MSB.

Referenced by XUartNs550_CfgInitialize().

#define XUN_FIFO_RX_TRIGGER 0x000000C0

Both trigger level bits.

Referenced by XUartNs550_GetFifoThreshold(), and XUartNs550_SetFifoThreshold().

#define XUN_FIFO_TRIGGER_01 0x00

1 byte trigger level

Referenced by XUartNs550_SetFifoThreshold().

#define XUN_FIFO_TRIGGER_04 0x40

4 byte trigger level

Referenced by XUartNs550_SetFifoThreshold().

#define XUN_FIFO_TRIGGER_08 0x80

8 byte trigger level

Referenced by XUartNs550_SetFifoThreshold().

#define XUN_FIFO_TRIGGER_14 0xC0

14 byte trigger level

Referenced by XUartNs550_SetFifoThreshold().

#define XUN_FIFO_TX_RESET 0x00000004

Reset the transmit FIFO.

#define XUN_FORMAT_1_STOP_BIT 0

1 stop bit

Referenced by XUartNs550_GetDataFormat(), and XUartNs550_SetDataFormat().

#define XUN_FORMAT_2_STOP_BIT 1

2 stop bits

Referenced by XUartNs550_GetDataFormat(), and XUartNs550_SetDataFormat().

#define XUN_FORMAT_5_BITS 0

5 data bits

#define XUN_FORMAT_6_BITS 1

6 data bits

#define XUN_FORMAT_7_BITS 2

7 data bits

#define XUN_FORMAT_8_BITS 3

These constants specify the data format that may be set or retrieved with the driver.

The data format includes the number of data bits, the number of stop bits and parity.8 data bits

Referenced by XUartNs550_CfgInitialize(), and XUartNs550_SetDataFormat().

#define XUN_FORMAT_EVEN_PARITY 2

Even Parity.

Referenced by XUartNs550_GetDataFormat(), and XUartNs550_SetDataFormat().

#define XUN_FORMAT_NO_PARITY 0

No Parity.

Referenced by XUartNs550_GetDataFormat(), and XUartNs550_SetDataFormat().

#define XUN_FORMAT_ODD_PARITY 1

Odd Parity.

Referenced by XUartNs550_GetDataFormat().

#define XUN_IER_MODEM_STATUS 0x00000008

Modem status interrupt.

#define XUN_IER_OFFSET (XUN_REG_OFFSET + 0x04)

Interrupt enable.

Referenced by XUartNs550_Recv(), XUartNs550_SelfTest(), XUartNs550_Send(), and XUartNs550_SendBuffer().

#define XUN_IER_RX_DATA 0x00000001

Receiver data available.

Referenced by XUartNs550_SendBuffer().

#define XUN_IER_RX_LINE 0x00000004

Receive status interrupt.

#define XUN_IER_TX_EMPTY 0x00000002

Transmitter empty interrupt.

Referenced by XUartNs550_Send(), and XUartNs550_SendBuffer().

#define XUN_IIR_OFFSET (XUN_REG_OFFSET + 0x08)

Interrupt id, read only.

Referenced by XUartNs550_InterruptHandler(), and XUartNs550_SendBuffer().

#define XUN_INT_ID_FIFOS_ENABLED 0x000000C0

Only the FIFOs enable.

Referenced by XUartNs550_SendBuffer().

#define XUN_INT_ID_MASK 0x0000000F

Only the interrupt ID.

Referenced by XUartNs550_InterruptHandler().

#define XUN_LCR_2_STOP_BITS 0x00000004

1= 2 stop bits,0 = 1 stop bit

Referenced by XUartNs550_GetDataFormat(), and XUartNs550_SetDataFormat().

#define XUN_LCR_6_DATA_BITS 0x00000001

6 Data bits selection

#define XUN_LCR_7_DATA_BITS 0x00000002

7 Data bits selection

#define XUN_LCR_8_DATA_BITS 0x00000003

8 Data bits selection

Referenced by XUartNs550_LowLevelExample().

#define XUN_LCR_DLAB 0x00000080

Divisor latch access.

Referenced by XUartNs550_SetBaud().

#define XUN_LCR_ENABLE_PARITY 0x00000008

1 = Enable, 0 = Disable parity

Referenced by XUartNs550_GetDataFormat(), and XUartNs550_SetDataFormat().

#define XUN_LCR_EVEN_PARITY 0x00000010

1 = even, 0 = odd parity

Referenced by XUartNs550_GetDataFormat(), and XUartNs550_SetDataFormat().

#define XUN_LCR_LENGTH_MASK 0x00000003

Both length bits mask.

Referenced by XUartNs550_GetDataFormat(), and XUartNs550_SetDataFormat().

#define XUN_LCR_OFFSET (XUN_REG_OFFSET + 0x0C)

Line Control Register.

#define XUN_LCR_PARITY_MASK 0x00000018

Both parity bits mask.

Referenced by XUartNs550_SetDataFormat().

#define XUN_LCR_SET_BREAK 0x00000040

Cause a break condition.

#define XUN_LCR_STICK_PARITY 0x00000020

Stick Parity.

#define XUN_LSR_BREAK_INT 0x00000010

Break detected interrupt.

Referenced by XUartNs550_ReceiveBuffer().

#define XUN_LSR_DATA_READY 0x00000001

Receive data ready.

Referenced by XUartNs550_ReceiveBuffer(), and XUartNs550_SelfTest().

#define XUN_LSR_ERROR_BREAK 0x0000001E

Errors except FIFO error and break detected.

Referenced by XUartNs550_GetLastErrors().

#define XUN_LSR_FRAMING_ERROR 0x00000008

Framing error on current byte.

#define XUN_LSR_OFFSET (XUN_REG_OFFSET + 0x14)

Line Status Register.

#define XUN_LSR_OVERRUN_ERROR 0x00000002

Overrun error on receive FIFO.

#define XUN_LSR_PARITY_ERROR 0x00000004

Parity error on current byte.

#define XUN_LSR_RX_FIFO_ERROR 0x00000080

An errored byte is in FIFO.

#define XUN_LSR_TX_BUFFER_EMPTY 0x00000020

Transmit holding reg empty.

Referenced by XUartNs550_SendBuffer().

#define XUN_LSR_TX_EMPTY 0x00000040

Transmitter is empty.

Referenced by XUartNs550_IsSending(), and XUartNs550_SendBuffer().

#define XUN_MCR_DTR 0x00000001

DTR signal.

#define XUN_MCR_LOOP 0x00000010

Local loopback.

Referenced by XUartNs550_SelfTest().

#define XUN_MCR_OFFSET (XUN_REG_OFFSET + 0x10)

Modem Control Register.

Referenced by XUartNs550_SelfTest().

#define XUN_MCR_OUT_1 0x00000004

General output 1 signal.

#define XUN_MCR_OUT_2 0x00000008

General output 2 signal.

#define XUN_MCR_RTS 0x00000002

RTS signal.

#define XUN_MODEM_CTS_DELTA_MASK 0x01

CTS signal changed state.

#define XUN_MODEM_CTS_MASK 0x10

Current state of CTS signal.

#define XUN_MODEM_DCD_DELTA_MASK 0x08

These constants specify the modem status that may be retrieved from the driver.

DCD signal changed state

#define XUN_MODEM_DCD_MASK 0x80

Current state of DCD signal.

#define XUN_MODEM_DSR_DELTA_MASK 0x02

DSR signal changed state.

#define XUN_MODEM_DSR_MASK 0x20

Current state of DSR signal.

#define XUN_MODEM_RING_STOP_MASK 0x04

Ringing has stopped.

#define XUN_MODEM_RINGING_MASK 0x40

Ring signal is active.

#define XUN_MSR_OFFSET (XUN_REG_OFFSET + 0x18)

Modem Status Register.

Referenced by XUartNs550_GetModemStatus().

#define XUN_OPTION_ASSERT_DTR 0x0001

Assert DTR signal.

#define XUN_OPTION_ASSERT_OUT1 0x0004

Assert out1 signal.

#define XUN_OPTION_ASSERT_OUT2 0x0008

Assert out2 signal.

#define XUN_OPTION_ASSERT_RTS 0x0002

Assert RTS signal.

#define XUN_OPTION_DATA_INTR 0x0100

Enable data interrupts.

Referenced by UartNs550IntrExample().

#define XUN_OPTION_FIFOS_ENABLE 0x0040

Enable FIFOs.

Referenced by UartNs550IntrExample(), and UartNs550PolledExample().

#define XUN_OPTION_LOOPBACK 0x0200

Enable local loopback.

Referenced by UartNs550IntrExample(), and UartNs550PolledExample().

#define XUN_OPTION_MODEM_INTR 0x0080

Enable modem interrupts.

#define XUN_OPTION_RESET_RX_FIFO 0x0010

Reset the receive FIFO.

#define XUN_OPTION_RESET_TX_FIFO 0x0020

Reset the transmit FIFO.

#define XUN_OPTION_RXLINE_INTR 0x0800

These constants specify the options that may be set or retrieved with the driver, each is a unique bit mask such that multiple options may be specified.

These constants indicate the function of the option when in the active state.Enable status interrupt

#define XUN_OPTION_SET_BREAK 0x0400

Set a break condition.

#define XUN_RBR_OFFSET (XUN_REG_OFFSET)

Receive buffer, read only.

Referenced by XUartNs550_ReceiveBuffer(), and XUartNs550_RecvByte().

#define XUN_THR_OFFSET (XUN_REG_OFFSET)

Transmit holding register.

Referenced by XUartNs550_SendBuffer(), and XUartNs550_SendByte().

Typedef Documentation

typedef void(* XUartNs550_Handler)(void *CallBackRef, u32 Event, unsigned int EventData)

This data type defines a handler which the application must define when using interrupt mode.

The handler will be called from the driver in an interrupt context to handle application specific processing.

Parameters

CallBackRef	is a callback reference passed in by the upper layer when setting the handler, and is passed back to the upper layer when the handler is called.
Event	contains one of the event constants indicating why the handler is being called.
EventData	contains the number of bytes sent or received at the time of the call for send and receive events and contains the modem status for modem events.

Function Documentation

int XUartNs550_CfgInitialize	(	XUartNs550 *	InstancePtr,
		XUartNs550_Config *	Config,
		UINTPTR	EffectiveAddr
	)

Initializes a specific XUartNs550 instance such that it is ready to be used.

The data format of the device is setup for 8 data bits, 1 stop bit, and no parity by default. The baud rate is set to a default value specified by Config->DefaultBaudRate if set, otherwise it is set to 19.2K baud. If the device has FIFOs (16550), they are enabled and the a receive FIFO threshold is set for 8 bytes. The default operating mode of the driver is polled mode.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance.
Config	is a reference to a structure containing information about a specific UART 16450/16550 device. XUartNs550_Init initializes an InstancePtr object for a specific device specified by the contents f Config. XUartNs550_Init can initialize multiple instance objects with the use of multiple calls giving different Config information on each call.
EffectiveAddr	is 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 if initialization was successful.
XST_UART_BAUD_ERROR if the baud rate is not possible because the input clock frequency is not divisible with an acceptable amount of error.

Note: None.

References XUartNs550::BaseAddress, XUartNs550_Config::DefaultBaudRate, XUartNs550::Handler, XUartNs550_Config::InputClockHz, XUartNs550::InputClockHz, XUartNs550::IsReady, XUartNs550::ReceiveBuffer, XUartNs550::SendBuffer, XUartNs550_ClearStats(), XUartNs550_SetLineControlReg, XUartNs550_WriteReg, XUN_FCR_OFFSET, XUN_FIFO_ENABLE, XUN_FIFO_RX_TRIG_MSB, and XUN_FORMAT_8_BITS.

Referenced by XUartNs550_Initialize().

void XUartNs550_ClearStats ( XUartNs550 * InstancePtr )

This function zeros the statistics for the given instance.

Parameters

InstancePtr is a pointer to the XUartNs550 instance.

Returns: None.

Note: None.

References XUartNs550Stats::CharactersReceived, XUartNs550Stats::CharactersTransmitted, XUartNs550::IsReady, XUartNs550Stats::ModemInterrupts, XUartNs550Stats::ReceiveBreakDetected, XUartNs550Stats::ReceiveFramingErrors, XUartNs550Stats::ReceiveInterrupts, XUartNs550Stats::ReceiveOverrunErrors, XUartNs550Stats::ReceiveParityErrors, XUartNs550::Stats, XUartNs550Stats::StatusInterrupts, and XUartNs550Stats::TransmitInterrupts.

Referenced by XUartNs550_CfgInitialize(), and XUartNs550_SelfTest().

void XUartNs550_GetDataFormat	(	XUartNs550 *	InstancePtr,
		XUartNs550Format *	FormatPtr
	)

Gets the data format for the specified UART.

The data format includes the baud rate, number of data bits, number of stop bits, and parity.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance.
FormatPtr	is a pointer to a format structure that will contain the data format after this call completes.

Returns: None.

Note: None.

References XUartNs550::BaseAddress, XUartNs550Format::BaudRate, XUartNs550::BaudRate, XUartNs550Format::DataBits, XUartNs550::IsReady, XUartNs550Format::Parity, XUartNs550Format::StopBits, XUartNs550_GetLineControlReg, XUN_FORMAT_1_STOP_BIT, XUN_FORMAT_2_STOP_BIT, XUN_FORMAT_EVEN_PARITY, XUN_FORMAT_NO_PARITY, XUN_FORMAT_ODD_PARITY, XUN_LCR_2_STOP_BITS, XUN_LCR_ENABLE_PARITY, XUN_LCR_EVEN_PARITY, and XUN_LCR_LENGTH_MASK.

u8 XUartNs550_GetFifoThreshold ( XUartNs550 * InstancePtr )

This function gets the receive FIFO trigger level.

The receive trigger level indicates the number of bytes in the receive FIFO that cause a receive data event (interrupt) to be generated.

Parameters

InstancePtr is a pointer to the XUartNs550 instance.

Returns: The current receive FIFO trigger level. Constants which define each trigger level are contained in the file xuartns550.h and named XUN_FIFO_TRIGGER_*.

Note: None.

References XUartNs550::BaseAddress, XUartNs550::IsReady, and XUN_FIFO_RX_TRIGGER.

u8 XUartNs550_GetLastErrors ( XUartNs550 * InstancePtr )

This function returns the last errors that have occurred in the specified UART.

It also clears the errors such that they cannot be retrieved again. The errors include parity error, receive overrun error, framing error, and break detection.

The last errors is an accumulation of the errors each time an error is discovered in the driver. A status is checked for each received byte and this status is accumulated in the last errors.

If this function is called after receiving a buffer of data, it will indicate any errors that occurred for the bytes of the buffer. It does not indicate which bytes contained errors.

Parameters

InstancePtr is a pointer to the XUartNs550 instance.

Returns: The last errors that occurred. The errors are bit masks that are contained in the file xuartns550.h and named XUN_ERROR_*.

Note: None.

References XUartNs550::LastErrors, and XUN_LSR_ERROR_BREAK.

Referenced by UartNs550IntrHandler().

u8 XUartNs550_GetModemStatus ( XUartNs550 * InstancePtr )

This function gets the modem status from the specified UART.

The modem status indicates any changes of the modem signals. This function allows the modem status to be read in a polled mode. The modem status is updated whenever it is read such that reading it twice may not yield the same results.

Parameters

InstancePtr is a pointer to the XUartNs550 instance .

Returns: The modem status which are bit masks that are contained in the file xuartns550.h and named XUN_MODEM_*.

Note

The bit masks used for the modem status are the exact bits of the modem status register with no abstraction.

References XUartNs550::BaseAddress, XUartNs550_ReadReg, and XUN_MSR_OFFSET.

u16 XUartNs550_GetOptions ( XUartNs550 * InstancePtr )

Gets the options for the specified driver instance.

The options are implemented as bit masks such that multiple options may be enabled or disabled simultaneously.

Parameters

InstancePtr is a pointer to the XUartNs550 instance.

Returns: The current options for the UART. The options are bit masks that are contained in the file xuartns550.h and named XUN_OPTION_*.

Note: None.

References XUartNs550::BaseAddress, XUartNs550::IsReady, XUartNs550_ReadReg, and XUN_FCR_OFFSET.

Referenced by UartNs550IntrExample(), and UartNs550PolledExample().

void XUartNs550_GetStats	(	XUartNs550 *	InstancePtr,
		XUartNs550Stats *	StatsPtr
	)

This functions returns a snapshot of the current statistics in the area provided.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance.
StatsPtr	is a pointer to a XUartNs550Stats structure to where the statistics are to be copied to.

Returns: None.

Note: None.

References XUartNs550Stats::CharactersReceived, XUartNs550Stats::CharactersTransmitted, XUartNs550::IsReady, XUartNs550Stats::ModemInterrupts, XUartNs550Stats::ReceiveBreakDetected, XUartNs550Stats::ReceiveFramingErrors, XUartNs550Stats::ReceiveInterrupts, XUartNs550Stats::ReceiveOverrunErrors, XUartNs550Stats::ReceiveParityErrors, XUartNs550::Stats, XUartNs550Stats::StatusInterrupts, and XUartNs550Stats::TransmitInterrupts.

int XUartNs550_Initialize	(	XUartNs550 *	InstancePtr,
		u16	DeviceId
	)

Initializes a specific XUartNs550 instance such that it is ready to be used.

The data format of the device is setup for 8 data bits, 1 stop bit, and no parity by default. The baud rate is set to a default value specified by XPAR_DEFAULT_BAUD_RATE if the symbol is defined, otherwise it is set to 19.2K baud. If the device has FIFOs (16550), they are enabled and the a receive FIFO threshold is set for 8 bytes. The default operating mode of the driver is polled mode.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance .
DeviceId	is the unique id of the device controlled by this XUartNs550 instance. Passing in a device id associates the generic XUartNs550 instance to a specific device, as chosen by the caller or application developer.

Returns

            - XST_SUCCESS if initialization was successful
            - XST_DEVICE_NOT_FOUND if the device ID could not be found in
    the configuration table
            - XST_UART_BAUD_ERROR if the baud rate is not possible because
    the input clock frequency is not divisible with an acceptable
    amount of error

Note: None.

References XUartNs550_Config::BaseAddress, XUartNs550_Config::DefaultBaudRate, XUartNs550_CfgInitialize(), and XUartNs550_LookupConfig().

Referenced by UartNs550HelloWorldExample(), UartNs550IntrExample(), UartNs550PolledExample(), and UartNs550SelfTestExample().

void XUartNs550_InterruptHandler ( XUartNs550 * InstancePtr )

This function is the interrupt handler for the 16450/16550 UART driver.

It must be connected to an interrupt system by the user such that it is called when an interrupt for any 16450/16550 UART occurs. This function does not save or restore the processor context such that the user must ensure this occurs.

Parameters

InstancePtr contains a pointer to the instance of the UART that the interrupt is for.

Returns: None.

Note: None.

References XUartNs550::BaseAddress, XUartNs550_ReadReg, XUN_IIR_OFFSET, and XUN_INT_ID_MASK.

int XUartNs550_IsSending ( XUartNs550 * InstancePtr )

This function determines if the specified UART is sending data.

If the transmitter register is not empty, it is sending data.

Parameters

InstancePtr is a pointer to the XUartNs550 instance.

Returns: A value of TRUE if the UART is sending data, otherwise FALSE.

Note: None.

References XUartNs550::BaseAddress, XUartNs550_GetLineStatusReg, and XUN_LSR_TX_EMPTY.

XUartNs550_Config * XUartNs550_LookupConfig ( u16 DeviceId )

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

A table contains the configuration info for each device in the system.

Parameters

DeviceId contains the ID of the device to look up the configuration for.

Returns: A pointer to the configuration found or NULL if the specified device ID was not found.

Note: None.

References XUartNs550_ConfigTable.

Referenced by UartNs550IntrExample(), and XUartNs550_Initialize().

unsigned int XUartNs550_ReceiveBuffer ( XUartNs550 * InstancePtr )

This function receives a buffer that has been previously specified by setting up the instance variables of the instance.

This function is designed to be an internal function for the XUartNs550 component such that it may be called from a shell function that sets up the buffer or from an interrupt handler.

This function will attempt to receive a specified number of bytes of data from the UART and store it into the specified buffer. This function is designed for either polled or interrupt driven modes. It is non-blocking such that it will return if there is no data has already received by the UART.

In a polled mode, this function will only receive as much data as the UART can buffer, either in the receiver or in the FIFO if present and enabled. The application may need to call it repeatedly to receive a buffer. Polled mode is the default mode of operation for the driver.

In interrupt mode, this function will start receiving and then the interrupt handler of the driver will continue until the buffer has been received. A callback function, as specified by the application, will be called to indicate the completion of receiving the buffer or when any receive errors or timeouts occur. Interrupt mode must be enabled using the SetOptions function.

Parameters

InstancePtr is a pointer to the XUartNs550 instance.

Returns: The number of bytes received.

Note: None.

References XUartNs550::BaseAddress, XUartNs550Stats::CharactersReceived, XUartNs550::ReceiveBuffer, XUartNs550::Stats, XUartNs550_GetLineStatusReg, XUartNs550_ReadReg, XUN_LSR_BREAK_INT, XUN_LSR_DATA_READY, and XUN_RBR_OFFSET.

Referenced by XUartNs550_Recv().

unsigned int XUartNs550_Recv	(	XUartNs550 *	InstancePtr,
		u8 *	BufferPtr,
		unsigned int	NumBytes
	)

This function will attempt to receive a specified number of bytes of data from the UART and store it into the specified buffer.

This function is designed for either polled or interrupt driven modes. It is non-blocking such that it will return if no data has already received by the UART.

In a polled mode, this function will only receive as much data as the UART can buffer, either in the receiver or in the FIFO if present and enabled. The application may need to call it repeatedly to receive a buffer. Polled mode is the default mode of operation for the driver.

In interrupt mode, this function will start receiving and then the interrupt handler of the driver will continue receiving data until the buffer has been received. A callback function, as specified by the application, will be called to indicate the completion of receiving the buffer or when any receive errors or timeouts occur. Interrupt mode must be enabled using the SetOptions function.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance.
BufferPtr	is pointer to buffer for data to be received into
NumBytes	is the number of bytes to be received. A value of zero will stop a previous receive operation that is in progress in interrupt mode.

Returns: The number of bytes received.

Note

The number of bytes is not asserted so that this function may be called with a value of zero to stop an operation that is already in progress.

References XUartNs550::BaseAddress, XUartNs550::IsReady, XUartNs550::ReceiveBuffer, XUartNs550_ReadReg, XUartNs550_ReceiveBuffer(), XUartNs550_WriteReg, and XUN_IER_OFFSET.

Referenced by UartNs550IntrExample(), UartNs550PolledExample(), and XUartNs550_SelfTest().

u8 XUartNs550_RecvByte ( UINTPTR BaseAddress )

This function receives a byte from the UART.

It operates in a polling mode and blocks until a byte of data is received.

Parameters

BaseAddress contains the base address of the UART.

Returns: The data byte received by the UART.

Note: None.

References XUartNs550_IsReceiveData, XUartNs550_ReadReg, and XUN_RBR_OFFSET.

Referenced by XUartNs550_LowLevelExample().

int XUartNs550_SelfTest ( XUartNs550 * InstancePtr )

This functions runs a self-test on the driver and hardware device.

This self test performs a local loopback and verifies data can be sent and received.

The statistics are cleared at the end of the test. The time for this test to execute is proportional to the baud rate that has been set prior to calling this function.

Parameters

InstancePtr is a pointer to the XUartNs550 instance.

Returns

            - XST_SUCCESS if the test was successful
            - XST_UART_TEST_FAIL if the test failed looping back the data

Note: This function can hang if the hardware is not functioning properly.

References XUartNs550::BaseAddress, XUartNs550::IsReady, XUartNs550_ClearStats(), XUartNs550_GetLineStatusReg, XUartNs550_ReadReg, XUartNs550_Recv(), XUartNs550_Send(), XUartNs550_WriteReg, XUN_IER_OFFSET, XUN_LSR_DATA_READY, XUN_MCR_LOOP, and XUN_MCR_OFFSET.

Referenced by UartNs550IntrExample(), UartNs550PolledExample(), and UartNs550SelfTestExample().

unsigned int XUartNs550_Send	(	XUartNs550 *	InstancePtr,
		u8 *	BufferPtr,
		unsigned int	NumBytes
	)

This functions sends the specified buffer of data using the UART in either polled or interrupt driven modes.

This function is non-blocking such that it will return before the data has been sent by the UART. If the UART is busy sending data, it will return and indicate zero bytes were sent.

In a polled mode, this function will only send as much data as the UART can buffer, either in the transmitter or in the FIFO if present and enabled. The application may need to call it repeatedly to send a buffer.

In interrupt mode, this function will start sending the specified buffer and then the interrupt handler of the driver will continue sending data until the buffer has been sent. A callback function, as specified by the application, will be called to indicate the completion of sending the buffer.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance.
BufferPtr	is pointer to a buffer of data to be sent.
NumBytes	contains the number of bytes to be sent. A value of zero will stop a previous send operation that is in progress in interrupt mode. Any data that was already put into the transmit FIFO will be sent.

Returns: The number of bytes actually sent.

Note

The number of bytes is not asserted so that this function may be called with a value of zero to stop an operation that is already in progress.

This function and the XUartNs550_SetOptions() function modify shared data such that there may be a need for mutual exclusion in a multithreaded environment and if XUartNs550_SetOptions() if called from a handler.

References XUartNs550::BaseAddress, XUartNs550::IsReady, XUartNs550::SendBuffer, XUartNs550_ReadReg, XUartNs550_SendBuffer(), XUartNs550_WriteReg, XUN_IER_OFFSET, and XUN_IER_TX_EMPTY.

Referenced by UartNs550HelloWorldExample(), UartNs550IntrExample(), UartNs550PolledExample(), and XUartNs550_SelfTest().

unsigned int XUartNs550_SendBuffer ( XUartNs550 * InstancePtr )

This function sends a buffer that has been previously specified by setting up the instance variables of the instance.

This function is designed to be an internal function for the XUartNs550 component such that it may be called from a shell function that sets up the buffer or from an interrupt handler.

This function sends the specified buffer of data to the UART in either polled or interrupt driven modes. This function is non-blocking such that it will return before the data has been sent by the UART.

In a polled mode, this function will only send as much data as the UART can buffer, either in the transmitter or in the FIFO if present and enabled. The application may need to call it repeatedly to send a buffer.

In interrupt mode, this function will start sending the specified buffer and then the interrupt handler of the driver will continue until the buffer has been sent. A callback function, as specified by the application, will be called to indicate the completion of sending the buffer.

Parameters

InstancePtr is a pointer to the XUartNs550 instance.

Returns: NumBytes is the number of bytes actually sent (put into the UART tranmitter and/or FIFO).

Note: None.

References XUartNs550::BaseAddress, XUartNs550Stats::CharactersTransmitted, XUartNs550::SendBuffer, XUartNs550::Stats, XUartNs550_GetLineStatusReg, XUartNs550_ReadReg, XUartNs550_WriteReg, XUN_IER_OFFSET, XUN_IER_RX_DATA, XUN_IER_TX_EMPTY, XUN_IIR_OFFSET, XUN_INT_ID_FIFOS_ENABLED, XUN_LSR_TX_BUFFER_EMPTY, XUN_LSR_TX_EMPTY, and XUN_THR_OFFSET.

Referenced by XUartNs550_Send().

void XUartNs550_SendByte	(	UINTPTR	BaseAddress,
		u8	Data
	)

This function sends a data byte with the UART.

This function operates in the polling mode and blocks until the data has been put into the UART transmit holding register.

Parameters

BaseAddress	contains the base address of the UART.
Data	contains the data byte to be sent.

Returns: None.

Note: None.

References XUartNs550_IsTransmitEmpty, XUartNs550_WriteReg, and XUN_THR_OFFSET.

Referenced by XUartNs550_LowLevelExample().

void XUartNs550_SetBaud	(	UINTPTR	BaseAddress,
		u32	InputClockHz,
		u32	BaudRate
	)

Set the baud rate for the UART.

Parameters

BaseAddress	contains the base address of the UART.
InputClockHz	is the frequency of the input clock to the device in Hertz.
BaudRate	is the baud rate to be set.

Returns: None.

Note: None.

References XUartNs550_GetLineControlReg, XUartNs550_SetLineControlReg, XUartNs550_WriteReg, XUN_DLL_OFFSET, XUN_DLM_OFFSET, and XUN_LCR_DLAB.

Referenced by XUartNs550_LowLevelExample().

int XUartNs550_SetDataFormat	(	XUartNs550 *	InstancePtr,
		XUartNs550Format *	FormatPtr
	)

Sets the data format for the specified UART.

The data format includes the baud rate, number of data bits, number of stop bits, and parity. It is the caller's responsibility to ensure that the UART is not sending or receiving data when this function is called.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance .
FormatPtr	is a pointer to a format structure containing the data format to be set.

Returns

    - XST_SUCCESS if the data format was successfully set.
    - XST_UART_BAUD_ERROR indicates the baud rate could not be set
    because of the amount of error with the baud rate and the input
    clock frequency.
    - XST_INVALID_PARAM if one of the parameters was not valid.

Note

The data types in the format type, data bits and parity, are 32 bit fields to prevent a compiler warning that is a bug with the GNU PowerPC compiler. The asserts in this function will cause a warning if these fields are bytes.

The baud rates tested include: 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200.

References XUartNs550::BaseAddress, XUartNs550Format::BaudRate, XUartNs550Format::DataBits, XUartNs550Format::Parity, XUartNs550Format::StopBits, XUartNs550_GetLineControlReg, XUartNs550_SetLineControlReg, XUN_FORMAT_1_STOP_BIT, XUN_FORMAT_2_STOP_BIT, XUN_FORMAT_8_BITS, XUN_FORMAT_EVEN_PARITY, XUN_FORMAT_NO_PARITY, XUN_LCR_2_STOP_BITS, XUN_LCR_ENABLE_PARITY, XUN_LCR_EVEN_PARITY, XUN_LCR_LENGTH_MASK, and XUN_LCR_PARITY_MASK.

int XUartNs550_SetFifoThreshold	(	XUartNs550 *	InstancePtr,
		u8	TriggerLevel
	)

This functions sets the receive FIFO trigger level.

The receive trigger level specifies the number of bytes in the receive FIFO that cause a receive data event (interrupt) to be generated. The FIFOs must be enabled to set the trigger level.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance.
TriggerLevel	contains the trigger level to set. Constants which define each trigger level are contained in the file xuartns550.h and named XUN_FIFO_TRIGGER_*.

Returns

XST_SUCCESS if the trigger level was set
XST_UART_CONFIG_ERROR if the trigger level could not be set, either the hardware does not support the FIFOs or FIFOs are not enabled

Note: None.

References XUartNs550::BaseAddress, XUartNs550::IsReady, XUartNs550_WriteReg, XUN_FCR_OFFSET, XUN_FIFO_ENABLE, XUN_FIFO_RX_TRIGGER, XUN_FIFO_TRIGGER_01, XUN_FIFO_TRIGGER_04, XUN_FIFO_TRIGGER_08, and XUN_FIFO_TRIGGER_14.

void XUartNs550_SetHandler	(	XUartNs550 *	InstancePtr,
		XUartNs550_Handler	FuncPtr,
		void *	CallBackRef
	)

This function sets the handler that will be called when an event (interrupt) occurs in the driver.

The purpose of the handler is to allow application specific processing to be performed.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance.
FuncPtr	is the pointer to the callback function.
CallBackRef	is the upper layer callback reference passed back when the callback function is invoked.

Returns: None.

Note

There is no assert on the CallBackRef since the driver doesn't know what it is (nor should it)

References XUartNs550::Handler, and XUartNs550::IsReady.

Referenced by UartNs550IntrExample().

int XUartNs550_SetOptions	(	XUartNs550 *	InstancePtr,
		u16	Options
	)

Sets the options for the specified driver instance.

The options are implemented as bit masks such that multiple options may be enabled or disabled simultaneously.

The GetOptions function may be called to retrieve the currently enabled options. The result is ORed in the desired new settings to be enabled and ANDed with the inverse to clear the settings to be disabled. The resulting value is then used as the options for the SetOption function call.

Parameters

InstancePtr	is a pointer to the XUartNs550 instance.
Options	contains the options to be set which are bit masks contained in the file xuartns550.h and named XUN_OPTION_*.

Returns

XST_SUCCESS if the options were set successfully.
XST_UART_CONFIG_ERROR if the options could not be set because the hardware does not support FIFOs

Note: None.

References XUartNs550::BaseAddress, XUartNs550::IsReady, XUartNs550_ReadReg, XUartNs550_WriteReg, and XUN_FCR_OFFSET.

Referenced by UartNs550IntrExample(), and UartNs550PolledExample().

Variable Documentation

XUartNs550_Config XUartNs550_ConfigTable[]

Initial value:

=
{
        {
                XPAR_UARTNS550_0_DEVICE_ID,
                XPAR_UARTNS550_0_BASEADDR,
                XPAR_UARTNS550_0_CLOCK_HZ
        }
}

The configuration table for UART 16550/16450 devices in the table.

Each device should have an entry in this table.

Referenced by XUartNs550_LookupConfig().

XUartNs550_Config XUartNs550_ConfigTable[]

The configuration table for UART 16550/16450 devices in the table.

Each device should have an entry in this table.

Referenced by XUartNs550_LookupConfig().

Data Structures

Macros

Typedefs

Functions

Variables

Configuration options

Data format values

FIFO trigger values

Modem status values

Callback events

Error values

Register Map

Interrupt Enable Register (IER) mask(s)

Interrupt ID Register (INT_ID) mask(s)

FIFO Control Register mask(s)

Line Control Register(LCR) mask(s)

Mode Control Register(MCR) mask(s)

Line Status Register(LSR) mask(s)

Macro Definition Documentation

Typedef Documentation

Function Documentation

Variable Documentation