iomodule: xiomodule_low_level_example.c File Reference

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xiomodule_low_level_example.c File Reference

## Overview

This file contains a design example using the low level-0 driver, interface of the IO Module driver.

Note

None

    MODIFICATION HISTORY:

    Ver   Who  Date     Changes

    1.00a sa   07/15/11 First release
    2.4   ms   01/23/17 Added 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
XStatus | IOModuleLowLevelExample (u32 IOModuleBaseAddress)
| This function is an example of how to use the IO Module driver component (XIOModule) and the hardware device. More...
void | SetupInterruptSystem ()
| This function connects the interrupt handler of the IO Module to the processor. More...
void | DeviceDriverHandler (void *CallbackRef)
| This function is designed to look like an interrupt handler in a device driver. More...
int | main (void)
| This is the main function for the IO Module Low Level example. More...

## Function Documentation

void DeviceDriverHandler | ( | void * | CallbackRef | ) |

This function is designed to look like an interrupt handler in a device driver.

This is typically a 2nd level handler that is called from the IO Module interrupt handler. This handler would typically perform device specific processing such as reading and writing the registers of the device to clear the interrupt condition and pass any data to an application using the device driver. Many drivers already provide this handler and the user is not required to create it.

Parameters

  CallbackRef | is passed back to the device driver's interrupt handler by the XIOModule driver. It was given to the XIOModule driver in the XIOModule_Connect() function call. It is typically a pointer to the device driver instance variable if using the Xilinx Level 1 device drivers. In this example, we do not care about the callback reference, so we passed it a 0 when connecting the handler to the XIOModule driver and we make no use of it here.

Returns
  None.

Note
  None.

XStatus IOModuleLowLevelExample | ( | u32 | IOModuleBaseAddress | ) |

This function is an example of how to use the IO Module driver component (XIOModule) and the hardware device.

This function is designed to work without external hardware devices to cause interrupts. It may not return if the IO Module is not properly connected to the processor in either software or hardware.

Parameters

  IOModuleBaseAddress | is Base Address of the the IO Module Device

Returns
  XST_SUCCESS to indicate success, otherwise XST_FAILURE

Note
  None.

References DeviceDriverHandler(), SetupInterruptSystem(), XIN_ISR_OFFSET, XIOModule_EnableIntr, and XIOModule_RegisterHandler().

Referenced by main().

int main | ( | void |  | ) |

This is the main function for the IO Module Low Level example.

Parameters

  None. |

Returns
  XST_SUCCESS to indicate success, otherwise XST_FAILURE.

Note
  None.

References IOModuleLowLevelExample().

void SetupInterruptSystem | ( |  | ) |

This function connects the interrupt handler of the IO Module to the processor.

This function is separate to allow it to be customized for each application. Each processor or RTOS may require unique processing to connect the interrupt handler.

Parameters

  None. |

Returns
  None.

Note
  None.

Referenced by IOModuleLowLevelExample().