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

struct	XGpio
	The XGpio driver instance data. More...

Macros
#define	XGPIO_H
	by using protection macros More...

#define	XGPIO_I_H
	by using protection macros More...

#define	XGPIO_L_H
	by using protection macros More...

#define	XGPIO_CHAN_OFFSET 8
	Channel offeset. More...

#define	XGpio_In32 Xil_In32
	Input Operations. More...

#define	XGpio_Out32 Xil_Out32
	Output Operations. More...

#define	XGpio_WriteReg(BaseAddress, RegOffset, Data) XGpio_Out32((BaseAddress) + (RegOffset), (u32)(Data))
	Write a value to a GPIO register. More...

#define	XGpio_ReadReg(BaseAddress, RegOffset) XGpio_In32((BaseAddress) + (RegOffset))
	Read a value from a GPIO register. More...

#define	XPAR_XGPIO_NUM_INSTANCES 0
	GPIO instances. More...

Functions
int	XGpio_CfgInitialize (XGpio InstancePtr, XGpio_Config Config, UINTPTR EffectiveAddr)
	Initialize the XGpio instance provided by the caller based on the given configuration data. More...

void	XGpio_SetDataDirection (XGpio *InstancePtr, unsigned Channel, u32 DirectionMask)
	Set the input/output direction of all discrete signals for the specified GPIO channel. More...

u32	XGpio_GetDataDirection (XGpio *InstancePtr, unsigned Channel)
	Get the input/output direction of all discrete signals for the specified GPIO channel. More...

u32	XGpio_DiscreteRead (XGpio *InstancePtr, unsigned Channel)
	Read state of discretes for the specified GPIO channel. More...

void	XGpio_DiscreteWrite (XGpio *InstancePtr, unsigned Channel, u32 Mask)
	Write to discretes register for the specified GPIO channel. More...

int	XGpio_Initialize (XGpio *InstancePtr, u16 DeviceId)
	Initialize the XGpio instance provided by the caller based on the given DeviceID. More...

XGpio_Config *	XGpio_LookupConfig (u16 DeviceId)
	Lookup the device configuration based on the unique device ID. More...

void	XGpio_DiscreteSet (XGpio *InstancePtr, unsigned Channel, u32 Mask)
	Set output discrete(s) to logic 1 for the specified GPIO channel. More...

void	XGpio_DiscreteClear (XGpio *InstancePtr, unsigned Channel, u32 Mask)
	Set output discrete(s) to logic 0 for the specified GPIO channel. More...

int	XGpio_SelfTest (XGpio *InstancePtr)
	Run a self-test on the driver/device. More...

void	XGpio_InterruptGlobalEnable (XGpio *InstancePtr)
	Enable the interrupt output signal. More...

void	XGpio_InterruptGlobalDisable (XGpio *InstancePtr)
	Disable the interrupt output signal. More...

void	XGpio_InterruptEnable (XGpio *InstancePtr, u32 Mask)
	Enable interrupts. More...

void	XGpio_InterruptDisable (XGpio *InstancePtr, u32 Mask)
	Disable interrupts. More...

void	XGpio_InterruptClear (XGpio *InstancePtr, u32 Mask)
	Clear pending interrupts with the provided mask. More...

u32	XGpio_InterruptGetEnabled (XGpio *InstancePtr)
	Returns the interrupt enable mask. More...

u32	XGpio_InterruptGetStatus (XGpio *InstancePtr)
	Returns the status of interrupt signals. More...

Variables
XGpio_Config	XGpio_ConfigTable []
	This table contains configuration information for each GPIO device in the system. More...

XGpio_Config	XGpio_ConfigTable []
	This table contains configuration information for each GPIO device in the system. More...

Registers
Register offsets for this device.
#define	XGPIO_DATA_OFFSET 0x0
	Data register for 1st channel. More...

#define	XGPIO_TRI_OFFSET 0x4
	I/O direction reg for 1st channel. More...

#define	XGPIO_DATA2_OFFSET 0x8
	Data register for 2nd channel. More...

#define	XGPIO_TRI2_OFFSET 0xC
	I/O direction reg for 2nd channel. More...

#define	XGPIO_GIE_OFFSET 0x11C
	Glogal interrupt enable register. More...

#define	XGPIO_ISR_OFFSET 0x120
	Interrupt status register. More...

#define	XGPIO_IER_OFFSET 0x128
	Interrupt enable register. More...

Interrupt Status and Enable Register bitmaps and masks
Bit definitions for the interrupt status register and interrupt enable registers.
#define	XGPIO_IR_MASK 0x3
	Mask of all bits. More...

#define	XGPIO_IR_CH1_MASK 0x1
	Mask for the 1st channel. More...

#define	XGPIO_IR_CH2_MASK 0x2
	Mask for the 2nd channel. More...

Global Interrupt Enable Register bitmaps and masks
Bit definitions for the Global Interrupt Enable register
#define	XGPIO_GIE_GINTR_ENABLE_MASK 0x80000000
	Mask for Global Interrupt. More...

Macro Definition Documentation

#define XGPIO_CHAN_OFFSET 8

Channel offeset.

Referenced by main(), XGpio_DiscreteClear(), XGpio_DiscreteRead(), XGpio_DiscreteSet(), XGpio_DiscreteWrite(), XGpio_GetDataDirection(), and XGpio_SetDataDirection().

#define XGPIO_DATA2_OFFSET 0x8

Data register for 2nd channel.

#define XGPIO_DATA_OFFSET 0x0

Data register for 1st channel.

Referenced by main(), XGpio_DiscreteClear(), XGpio_DiscreteRead(), XGpio_DiscreteSet(), and XGpio_DiscreteWrite().

#define XGPIO_GIE_GINTR_ENABLE_MASK 0x80000000

Mask for Global Interrupt.

Referenced by XGpio_InterruptGlobalEnable().

#define XGPIO_GIE_OFFSET 0x11C

Glogal interrupt enable register.

Referenced by XGpio_InterruptGlobalDisable(), and XGpio_InterruptGlobalEnable().

#define XGPIO_H

by using protection macros

#define XGPIO_I_H

by using protection macros

#define XGPIO_IER_OFFSET 0x128

Interrupt enable register.

Referenced by XGpio_InterruptDisable(), XGpio_InterruptEnable(), and XGpio_InterruptGetEnabled().

#define XGpio_In32 Xil_In32

Input Operations.

#define XGPIO_IR_CH1_MASK 0x1

Mask for the 1st channel.

#define XGPIO_IR_CH2_MASK 0x2

Mask for the 2nd channel.

#define XGPIO_IR_MASK 0x3

Mask of all bits.

#define XGPIO_ISR_OFFSET 0x120

Interrupt status register.

Referenced by XGpio_InterruptClear(), and XGpio_InterruptGetStatus().

#define XGPIO_L_H

by using protection macros

#define XGpio_Out32 Xil_Out32

Output Operations.

#define XGpio_ReadReg	(	BaseAddress,
		RegOffset
	)	XGpio_In32((BaseAddress) + (RegOffset))

Read a value from a GPIO register.

A 32 bit read is performed. If the GPIO core is implemented in a smaller width, only the least significant data is read from the register. The most significant data will be read as 0.

Parameters

BaseAddress	is the base address of the GPIO device.
RegOffset	is the register offset from the base to read from.

Returns: Data read from the register.

Note: C-style signature: u32 XGpio_ReadReg(u32 BaseAddress, u32 RegOffset)

Referenced by main(), XGpio_DiscreteClear(), XGpio_DiscreteRead(), XGpio_DiscreteSet(), XGpio_GetDataDirection(), XGpio_InterruptClear(), XGpio_InterruptDisable(), XGpio_InterruptEnable(), XGpio_InterruptGetEnabled(), and XGpio_InterruptGetStatus().

#define XGPIO_TRI2_OFFSET 0xC

I/O direction reg for 2nd channel.

#define XGPIO_TRI_OFFSET 0x4

I/O direction reg for 1st channel.

Referenced by main(), XGpio_GetDataDirection(), and XGpio_SetDataDirection().

#define XGpio_WriteReg	(	BaseAddress,
		RegOffset,
		Data
	)	XGpio_Out32((BaseAddress) + (RegOffset), (u32)(Data))

Write a value to a GPIO register.

A 32 bit write is performed. If the GPIO core is implemented in a smaller width, only the least significant data is written.

Parameters

BaseAddress	is the base address of the GPIO device.
RegOffset	is the register offset from the base to write to.
Data	is the data written to the register.

Returns: None.

Note: C-style signature: void XGpio_WriteReg(u32 BaseAddress, u32 RegOffset, u32 Data)

Referenced by main(), XGpio_DiscreteClear(), XGpio_DiscreteSet(), XGpio_DiscreteWrite(), XGpio_InterruptClear(), XGpio_InterruptDisable(), XGpio_InterruptEnable(), XGpio_InterruptGlobalDisable(), XGpio_InterruptGlobalEnable(), and XGpio_SetDataDirection().

#define XPAR_XGPIO_NUM_INSTANCES 0

GPIO instances.

Referenced by XGpio_LookupConfig().

Function Documentation

int XGpio_CfgInitialize	(	XGpio *	InstancePtr,
		XGpio_Config *	Config,
		UINTPTR	EffectiveAddr
	)

Initialize the XGpio instance provided by the caller based on the given configuration data.

Nothing is done except to initialize the InstancePtr.

Parameters

InstancePtr	is a pointer to an XGpio instance. The memory the pointer references must be pre-allocated by the caller. Further calls to manipulate the driver through the XGpio API must be made with this pointer.
Config	is a reference to a structure containing information about a specific GPIO device. This function initializes an InstancePtr object for a specific device specified by the contents of Config. This function 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 the initialization is successful.

Note: None.

References XGpio::BaseAddress, XGpio_Config::InterruptPresent, XGpio::InterruptPresent, XGpio_Config::IsDual, XGpio::IsDual, and XGpio::IsReady.

Referenced by XGpio_Initialize().

void XGpio_DiscreteClear	(	XGpio *	InstancePtr,
		unsigned	Channel,
		u32	Mask
	)

Set output discrete(s) to logic 0 for the specified GPIO channel.

Parameters

InstancePtr	is a pointer to an XGpio instance to be worked on.
Channel	contains the channel of the GPIO (1 or 2) to operate on.
Mask	is the set of bits that will be set to 0 in the discrete data register. All other bits in the data register are unaffected.

Returns: None.

Note

The hardware must be built for dual channels if this function is used with any channel other than 1. If it is not, this function will assert.

This API can only be used if the GPIO_IO ports in the IP are used for connecting to the external output ports.

References XGpio::BaseAddress, XGpio::IsDual, XGpio::IsReady, XGPIO_CHAN_OFFSET, XGPIO_DATA_OFFSET, XGpio_ReadReg, and XGpio_WriteReg.

Referenced by GpioOutputExample(), and main().

u32 XGpio_DiscreteRead	(	XGpio *	InstancePtr,
		unsigned	Channel
	)

Read state of discretes for the specified GPIO channel.

Parameters

InstancePtr	is a pointer to an XGpio instance to be worked on.
Channel	contains the channel of the GPIO (1 or 2) to operate on.

Returns: Current copy of the discretes register.

Note: The hardware must be built for dual channels if this function is used with any channel other than 1. If it is not, this function will assert.

References XGpio::BaseAddress, XGpio::IsDual, XGpio::IsReady, XGPIO_CHAN_OFFSET, XGPIO_DATA_OFFSET, and XGpio_ReadReg.

Referenced by GpioInputExample(), and XGpio_SelfTest().

void XGpio_DiscreteSet	(	XGpio *	InstancePtr,
		unsigned	Channel,
		u32	Mask
	)

Set output discrete(s) to logic 1 for the specified GPIO channel.

Parameters

InstancePtr	is a pointer to an XGpio instance to be worked on.
Channel	contains the channel of the GPIO (1 or 2) to operate on.
Mask	is the set of bits that will be set to 1 in the discrete data register. All other bits in the data register are unaffected.

Returns: None.

Note

The hardware must be built for dual channels if this function is used with any channel other than 1. If it is not, this function will assert.

This API can only be used if the GPIO_IO ports in the IP are used for connecting to the external output ports.

References XGpio::BaseAddress, XGpio::IsDual, XGpio::IsReady, XGPIO_CHAN_OFFSET, XGPIO_DATA_OFFSET, XGpio_ReadReg, and XGpio_WriteReg.

void XGpio_DiscreteWrite	(	XGpio *	InstancePtr,
		unsigned	Channel,
		u32	Mask
	)

Write to discretes register for the specified GPIO channel.

Parameters

InstancePtr	is a pointer to an XGpio instance to be worked on.
Channel	contains the channel of the GPIO (1 or 2) to operate on.
Mask	is the value to be written to the discretes register.

Returns: None.

Note: The hardware must be built for dual channels if this function is used with any channel other than 1. If it is not, this function will assert. See also XGpio_DiscreteSet() and XGpio_DiscreteClear().

References XGpio::BaseAddress, XGpio::IsDual, XGpio::IsReady, XGPIO_CHAN_OFFSET, XGPIO_DATA_OFFSET, and XGpio_WriteReg.

Referenced by GpioOutputExample(), and main().

u32 XGpio_GetDataDirection	(	XGpio *	InstancePtr,
		unsigned	Channel
	)

Get the input/output direction of all discrete signals for the specified GPIO channel.

Parameters

InstancePtr	is a pointer to an XGpio instance to be worked on.
Channel	contains the channel of the GPIO (1 or 2) to operate on.

Returns: Bitmask specifying which discretes are input and which are output. Bits set to 0 are output and bits set to 1 are input.

Note

The hardware must be built for dual channels if this function is used with any channel other than 1. If it is not, this function will assert.

References XGpio::BaseAddress, XGpio::IsDual, XGpio::IsReady, XGPIO_CHAN_OFFSET, XGpio_ReadReg, and XGPIO_TRI_OFFSET.

int XGpio_Initialize	(	XGpio *	InstancePtr,
		u16	DeviceId
	)

Initialize the XGpio instance provided by the caller based on the given DeviceID.

Nothing is done except to initialize the InstancePtr.

Parameters

InstancePtr	is a pointer to an XGpio instance. The memory the pointer references must be pre-allocated by the caller. Further calls to manipulate the instance/driver through the XGpio API must be made with this pointer.
DeviceId	is the unique id of the device controlled by this XGpio instance. Passing in a device id associates the generic XGpio instance to a specific device, as chosen by the caller or application developer.

Returns

XST_SUCCESS if the initialization was successful.
XST_DEVICE_NOT_FOUND if the device configuration data was not found for a device with the supplied device ID.

Note: None.

References XGpio_Config::BaseAddress, XGpio::IsReady, XGpio_CfgInitialize(), and XGpio_LookupConfig().

Referenced by GpioInputExample(), GpioIntrExample(), GpioOutputExample(), and main().

void XGpio_InterruptClear	(	XGpio *	InstancePtr,
		u32	Mask
	)

Clear pending interrupts with the provided mask.

This function should be called after the software has serviced the interrupts that are pending. This function will assert if the hardware device has not been built with interrupt capabilities.

Parameters

InstancePtr	is the GPIO instance to operate on.
Mask	is the mask to clear pending interrupts for. Bit positions of 1 are cleared. This mask is formed by OR'ing bits from XGPIO_IR* bits which are contained in xgpio_l.h.

Returns: None.

Note: None.

References XGpio::BaseAddress, XGpio::InterruptPresent, XGpio::IsReady, XGPIO_ISR_OFFSET, XGpio_ReadReg, and XGpio_WriteReg.

Referenced by GpioHandler().

void XGpio_InterruptDisable	(	XGpio *	InstancePtr,
		u32	Mask
	)

Disable interrupts.

This function allows specific interrupts for each channel to be disabled. This function will assert if the hardware device has not been built with interrupt capabilities.

Parameters

InstancePtr	is the GPIO instance to operate on.
Mask	is the mask to disable. Bits set to 1 are disabled. This mask is formed by OR'ing bits from XGPIO_IR* bits which are contained in xgpio_l.h.

Returns: None.

Note: None.

References XGpio::BaseAddress, XGpio::InterruptPresent, XGpio::IsReady, XGPIO_IER_OFFSET, XGpio_ReadReg, and XGpio_WriteReg.

Referenced by GpioDisableIntr().

void XGpio_InterruptEnable	(	XGpio *	InstancePtr,
		u32	Mask
	)

Enable interrupts.

The global interrupt must also be enabled by calling XGpio_InterruptGlobalEnable() for interrupts to occur. This function will assert if the hardware device has not been built with interrupt capabilities.

Parameters

InstancePtr	is the GPIO instance to operate on.
Mask	is the mask to enable. Bit positions of 1 are enabled. This mask is formed by OR'ing bits from XGPIO_IR* bits which are contained in xgpio_l.h.

Returns: None.

Note: None.

References XGpio::BaseAddress, XGpio::InterruptPresent, XGpio::IsReady, XGPIO_IER_OFFSET, XGpio_ReadReg, and XGpio_WriteReg.

Referenced by GpioSetupIntrSystem().

u32 XGpio_InterruptGetEnabled ( XGpio * InstancePtr )

Returns the interrupt enable mask.

This function will assert if the hardware device has not been built with interrupt capabilities.

Parameters

InstancePtr is the GPIO instance to operate on.

Returns: A mask of bits made from XGPIO_IR* bits which are contained in xgpio_l.h.; None.

Note: None.

References XGpio::BaseAddress, XGpio::InterruptPresent, XGpio::IsReady, XGPIO_IER_OFFSET, and XGpio_ReadReg.

u32 XGpio_InterruptGetStatus ( XGpio * InstancePtr )

Returns the status of interrupt signals.

Any bit in the mask set to 1 indicates that the channel associated with the bit has asserted an interrupt condition. This function will assert if the hardware device has not been built with interrupt capabilities.

Parameters

InstancePtr is the GPIO instance to operate on.

Returns: A pointer to a mask of bits made from XGPIO_IR* bits which are contained in xgpio_l.h.

Note

The interrupt status indicates the status of the device regardless if the interrupts from the devices have been enabled or not through XGpio_InterruptEnable().

References XGpio::BaseAddress, XGpio::InterruptPresent, XGpio::IsReady, XGPIO_ISR_OFFSET, and XGpio_ReadReg.

void XGpio_InterruptGlobalDisable ( XGpio * InstancePtr )

Disable the interrupt output signal.

Interrupts enabled through XGpio_InterruptEnable() will no longer be passed through until the global enable bit is set by XGpio_InterruptGlobalEnable(). This function is designed to allow all interrupts (both channels) to be disabled easily for entering a critical section. This function will assert if the hardware device has not been built with interrupt capabilities.

Parameters

InstancePtr is the GPIO instance to operate on.

Returns: None.

Note: None.

References XGpio::BaseAddress, XGpio::InterruptPresent, XGpio::IsReady, XGPIO_GIE_OFFSET, and XGpio_WriteReg.

void XGpio_InterruptGlobalEnable ( XGpio * InstancePtr )

Enable the interrupt output signal.

Interrupts enabled through XGpio_InterruptEnable() will not be passed through until the global enable bit is set by this function. This function is designed to allow all interrupts (both channels) to be enabled easily for exiting a critical section. This function will assert if the hardware device has not been built with interrupt capabilities.

Parameters

InstancePtr is the GPIO instance to operate on.

Returns: None.

Note: None.

References XGpio::BaseAddress, XGpio::InterruptPresent, XGpio::IsReady, XGPIO_GIE_GINTR_ENABLE_MASK, XGPIO_GIE_OFFSET, and XGpio_WriteReg.

Referenced by GpioSetupIntrSystem().

XGpio_Config * XGpio_LookupConfig ( u16 DeviceId )

Lookup the device configuration based on the unique device ID.

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

Parameters

DeviceId is the device identifier to lookup.

Returns

A pointer of data type XGpio_Config which points to the device configuration if DeviceID is found.
NULL if DeviceID is not found.

Note: None.

References XGpio_ConfigTable, and XPAR_XGPIO_NUM_INSTANCES.

Referenced by GpioIntrExample(), GpioOutputExample(), and XGpio_Initialize().

int XGpio_SelfTest ( XGpio * InstancePtr )

Run a self-test on the driver/device.

This function does a minimal test in which the data register is read. It only does a read without any kind of test because the hardware has been parameterized such that it may be only an input such that the state of the inputs won't be known.

All other hardware features of the device are not guaranteed to be in the hardware since they are parameterizable.

Parameters

InstancePtr is a pointer to the XGpio instance to be worked on. This parameter must have been previously initialized with XGpio_Initialize().

Returns: XST_SUCCESS always. If the GPIO device was not present in the hardware a bus error could be generated. Other indicators of a bus error, such as registers in bridges or buses, may be necessary to determine if this function caused a bus error.

Note: None.

References XGpio::IsReady, and XGpio_DiscreteRead().

void XGpio_SetDataDirection	(	XGpio *	InstancePtr,
		unsigned	Channel,
		u32	DirectionMask
	)

Set the input/output direction of all discrete signals for the specified GPIO channel.

Parameters

InstancePtr	is a pointer to an XGpio instance to be worked on.
Channel	contains the channel of the GPIO (1 or 2) to operate on.
DirectionMask	is a bitmask specifying which discretes are input and which are output. Bits set to 0 are output and bits set to 1 are input.

Returns: None.

Note: The hardware must be built for dual channels if this function is used with any channel other than 1. If it is not, this function will assert.

References XGpio::BaseAddress, XGpio::IsDual, XGpio::IsReady, XGPIO_CHAN_OFFSET, XGPIO_TRI_OFFSET, and XGpio_WriteReg.

Referenced by GpioInputExample(), GpioOutputExample(), and main().