spips: xspips_flash_intr_example.c File Reference

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xspips_flash_intr_example.c File Reference

## Overview

This file contains a design example using the SPI driver (XSpiPs) in interrupt mode with a serial flash device.

This examples performs transfers in Manual start mode using interrupts. The hardware which this example runs on, must have a serial flash for it to run. This example has been tested with SST25W080.

Note

None.

     MODIFICATION HISTORY:

     Ver   Who Date     Changes

     1.00  sg  1/30/13  First release
           ms  04/05/17 Modified Comment lines in functions to
                        recognize it as documentation block for doxygen
                        generation.
     3.2  nsk  03/26/19 Add support for versal

## Functions
void | SpiPsHandler (void *CallBackRef, u32 StatusEvent, unsigned int ByteCount)
| This function is the handler which performs processing for the SPI driver. More...
int | SpiPsFlashIntrExample (XScuGic *IntcInstancePtr, XSpiPs *SpiInstancePtr, u16 SpiDeviceId, u16 SpiIntrId)
| The purpose of this function is to illustrate how to use the XSpiPs device driver in interrupt mode. More...
int | main (void)
| Main function to call the SPI Flash example. More...

## Function Documentation

int main | ( | void |  | ) |

Main function to call the SPI Flash example.

Parameters

  None |

Returns
  - XST_SUCCESS if successful
  - XST_FAILURE if not successful

Note
  None

References SpiPsFlashIntrExample().

int SpiPsFlashIntrExample | ( | XScuGic * | IntcInstancePtr,
|  | XSpiPs * | SpiInstancePtr,
|  | u16 | SpiDeviceId,
|  | u16 | SpiIntrId
| ) |  |

The purpose of this function is to illustrate how to use the XSpiPs device driver in interrupt mode.

This function writes and reads data from a serial flash.

Parameters

  IntcInstancePtr | is a pointer to Interrupt Controller instance.
  SpiInstancePtr | is a pointer to the SPI driver instance to use.
  SpiDeviceId | is the Instance Id of SPI in the system.
  SpiIntrId | is the Interrupt Id for SPI in the system.
  None. |

Returns
  - XST_SUCCESS if successful
  - XST_FAILURE if not successful

Note

This function calls other functions which contain loops that may be infinite if interrupts are not working such that it may not return. If the device slave select is not correct and the device is not responding on bus it will read a status of 0xFF for the status register as the bus is pulled up.

References XSpiPs_Config::BaseAddress, SpiPsHandler(), XSpiPs_CfgInitialize(), XSPIPS_CLK_PRESCALE_8, XSPIPS_FORCE_SSELECT_OPTION, XSpiPs_LookupConfig(), XSPIPS_MANUAL_START_OPTION, XSPIPS_MASTER_OPTION, XSpiPs_SelfTest(), XSpiPs_SetClkPrescaler(), XSpiPs_SetOptions(), XSpiPs_SetSlaveSelect(), and XSpiPs_SetStatusHandler().

Referenced by main().

void SpiPsHandler | ( | void * | CallBackRef,
|  | u32 | StatusEvent,
|  | unsigned int | ByteCount
| ) |  |

This function is the handler which performs processing for the SPI driver.

It is called from an interrupt context such that the amount of processing performed should be minimized. It is called when a transfer of SPI data completes or an error occurs.

This handler provides an example of how to handle SPI interrupts but is application specific.

Parameters

  CallBackRef | is a reference passed to the handler.
  StatusEvent | is the status of the SPI .
  ByteCount | is the number of bytes transferred.

Returns
  None

Note
  None.

Referenced by SpiPsFlashIntrExample().