gpio: xgpio_intr_tapp_example.c File Reference

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xgpio_intr_tapp_example.c File Reference

## Overview

This file contains a design example using the GPIO driver (XGpio) in an interrupt driven mode of operation.

This example does assume that there is an interrupt controller in the hardware system and the GPIO device is connected to the interrupt controller.

This file is used in the Peripheral Tests Application in SDK to include a simplified test for gpio interrupts.

The buttons and LEDs are on 2 separate channels of the GPIO so that interrupts are not caused when the LEDs are turned on and off.

     MODIFICATION HISTORY:

     Ver   Who  Date         Changes

     2.01a sn   05/09/06 Modified to be used by TestAppGen to include test for
                          interrupts.
     3.00a ktn  11/21/09 Updated to use HAL Processor APIs and minor changes
                          as per coding guidelines.
     3.00a sdm  02/16/11 Updated to support ARM Generic Interrupt Controller
     4.1   lks  11/18/15 Updated to use canonical xparameters and
                          clean up of the comments and code for CR 900381
     4.3   ms   01/23/17 Modified xil_printf statement in main function to
                         ensure that "Successfully ran" and "Failed" strings
                         are available in all examples. This is a fix for
                         CR-965028.

## Functions
void | GpioHandler (void *CallbackRef)
| This is the interrupt handler routine for the GPIO for this example. More...
int | GpioIntrExample (INTC *IntcInstancePtr, XGpio *InstancePtr, u16 DeviceId, u16 IntrId, u16 IntrMask, u32 *DataRead)
| This is the entry function from the TestAppGen tool generated application which tests the interrupts when enabled in the GPIO. More...
int | GpioSetupIntrSystem (INTC *IntcInstancePtr, XGpio *InstancePtr, u16 DeviceId, u16 IntrId, u16 IntrMask)
| This function performs the GPIO set up for Interrupts. More...
void | GpioDisableIntr (INTC *IntcInstancePtr, XGpio *InstancePtr, u16 IntrId, u16 IntrMask)
| This function disables the interrupts for the GPIO. More...
int | main (void)
| This function is the main function of the GPIO example. More...

## Function Documentation

void GpioDisableIntr | ( | INTC * | IntcInstancePtr,
|  | XGpio * | InstancePtr,
|  | u16 | IntrId,
|  | u16 | IntrMask
| ) |  |

This function disables the interrupts for the GPIO.

Parameters

  IntcInstancePtr | is a pointer to the Interrupt Controller driver Instance
  InstancePtr | is a pointer to the GPIO driver Instance
  IntrId | is XPAR_<INTC_instance>_<GPIO_instance>_VEC value from xparameters.h
  IntrMask | is the GPIO channel mask

Returns
  None

Note
  None.

References XGpio_InterruptDisable().

Referenced by GpioIntrExample().

void GpioHandler | ( | void * | CallbackRef | ) |

This is the interrupt handler routine for the GPIO for this example.

Parameters

  CallbackRef | is the Callback reference for the handler.

Returns
  None.

Note
  None.

References XGpio_InterruptClear().

Referenced by GpioSetupIntrSystem().

int GpioIntrExample | ( | INTC * | IntcInstancePtr,
|  | XGpio * | InstancePtr,
|  | u16 | DeviceId,
|  | u16 | IntrId,
|  | u16 | IntrMask,
|  | u32 * | DataRead
| ) |  |

This is the entry function from the TestAppGen tool generated application which tests the interrupts when enabled in the GPIO.

Parameters

  IntcInstancePtr | is a reference to the Interrupt Controller driver Instance
  InstancePtr | is a reference to the GPIO driver Instance
  DeviceId | is the XPAR_<GPIO_instance>_DEVICE_ID value from xparameters.h
  IntrId | is XPAR_<INTC_instance>_<GPIO_instance>_IP2INTC_IRPT_INTR value from xparameters.h
  IntrMask | is the GPIO channel mask
  DataRead | is the pointer where the data read from GPIO Input is returned

Returns
  - XST_SUCCESS if the Test is successful
  - XST_FAILURE if the test is not successful

Note
  None.

References GpioDisableIntr(), GpioSetupIntrSystem(), and XGpio_Initialize().

Referenced by main().

int GpioSetupIntrSystem | ( | INTC * | IntcInstancePtr,
|  | XGpio * | InstancePtr,
|  | u16 | DeviceId,
|  | u16 | IntrId,
|  | u16 | IntrMask
| ) |  |

This function performs the GPIO set up for Interrupts.

Parameters

  IntcInstancePtr | is a reference to the Interrupt Controller driver Instance
  InstancePtr | is a reference to the GPIO driver Instance
  DeviceId | is the XPAR_<GPIO_instance>_DEVICE_ID value from xparameters.h
  IntrId | is XPAR_<INTC_instance>_<GPIO_instance>_IP2INTC_IRPT_INTR value from xparameters.h
  IntrMask | is the GPIO channel mask

Returns
  XST_SUCCESS if the Test is successful, otherwise XST_FAILURE

Note
  None.

References GpioHandler(), XGpio_InterruptEnable(), and XGpio_InterruptGlobalEnable().

Referenced by GpioIntrExample().

int main | ( | void |  | ) |

This function is the main function of the GPIO example.

It is responsible for initializing the GPIO device, setting up interrupts and providing a foreground loop such that interrupt can occur in the background.

Parameters

  None. |

Returns
  - XST_SUCCESS to indicate success.
  - XST_FAILURE to indicate failure.

Note
  None.

References GpioIntrExample().