xspips_slave_polled_example.c File Reference

Overview

This file contains a design example using the SPI controller in slave mode.

This examples performs transfers in polled mode and has been tested with Aardvark Analyzer as Master. This example echoes data which it receives from the master. The slave controller expects MAX_DATA bytes of data from the master to transmit onto the SPI bus which the slave will receive into its Rx buffer. It will poll until the Rx FIFO is filled with the Threshold limit of data which is set to MAX_DATA. On sending data, the master will receive dummy bytes in response. Master has to send MAX_DATA dummy bytes to read back the echoed data.

Note

The slave mode test needs an external master to send data to the Spi device. This example has been tested with Aardvark Analyzer as Master. The Clock Polarity and Phase should match between master and the slave.

MODIFICATION HISTORY:

Ver   Who Date     Changes



2.0   sb  08/22/14  First release
      ms   04/05/17 Modified Comment lines in functions to
                    recognize it as documentation block for doxygen
                    generation.
3.9   sb   07/05/23 Added support for system device-tree flow.
3.13  sb   09/09/25 Fix GCC warnings.
3.14 vlt  12/18/25 Update Doxygen comments to include SDT flow details.

#include "xparameters.h"
#include "xspips.h"
#include "xil_printf.h"

Functions
int	SpiPsSlavePolledExample (UINTPTR BaseAddress)
	The purpose of this function is to illustrate how to use the XSpiPs device driver in Slave mode. More...
int	main (void)
	Main function to call the SPI Slave Example. More...

Function Documentation

int main

(

void

)

Main function to call the SPI Slave Example.

Returns

• XST_SUCCESS if successful
• XST_FAILURE if not successful

Note

None

References SpiPsSlavePolledExample().

int SpiPsSlavePolledExample

(

UINTPTR

BaseAddress

)

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

This function reads data from a SPI Master and will echo it back to the Master.

Parameters

BaseAddress

contains the base address of the device

Returns

• XST_SUCCESS if successful
• XST_FAILURE if not successful

Note

In XSCT/classic flow, DeviceId is used to look up the device configuration.

References XSpiPs_Config::BaseAddress, XSpiPs_CfgInitialize(), XSpiPs_LookupConfig(), and XSpiPs_PolledTransfer().

Referenced by main().