xspips_eeprom_polled_example.c File Reference

Overview

This file contains a design example using the SPI driver (XSpiPs) in polled mode and hardware device with a serial EEPROM device.

The hardware which this example runs on must have a serial EEPROM (Microchip 25XX320 or 25XX160) for it to run. This example has been tested with the SPI EEPROM on the EP4.5 ARM processor.

Note

None.

 MODIFICATION HISTORY:

 Ver   Who  Date     Changes



 1.00  sdm  03/09/10 First release
 1.00  sdm  10/25/11 Updated the chip select to be used to second chip select
       ms   04/05/17 Modified Comment lines in functions to
                     recognize it as documentation block for doxygen
                     generation and also modified filename tag to include
                     the file in doxygen examples.
 3.9   sb   07/05/23 Added support for system device-tree flow.

Functions
void	EepromRead (XSpiPs *SpiPtr, u16 Address, int ByteCount, EepromBuffer Buffer)
	This function reads from the serial EEPROM connected to the SPI interface. More...
void	EepromWrite (XSpiPs *SpiPtr, u16 Address, u8 ByteCount, EepromBuffer Buffer)
	This function writes to the serial EEPROM connected to the SPI interface. More...
int	SpiPsEepromPolledExample (XSpiPs *SpiInstancePtr, u16 SpiDeviceId)
	The purpose of this function is to illustrate how to use the XSpiPs device driver in polled mode. More...
int	main (void)
	Main function to call the Spi Eeprom example. More...

Function Documentation

void EepromRead	(	XSpiPs *	SpiPtr,
		u16	Address,
		int	ByteCount,
		EepromBuffer	Buffer
	)

This function reads from the serial EEPROM connected to the SPI interface.

Parameters

SpiPtr	is a pointer to the SPI driver component to use.
Address	contains the address to read data from in the EEPROM.
ByteCount	contains the number of bytes to read.
Buffer	is a buffer to read the data into.

Returns

None.

Note

None.

void EepromWrite	(	XSpiPs *	SpiPtr,
		u16	Address,
		u8	ByteCount,
		EepromBuffer	Buffer
	)

This function writes to the serial EEPROM connected to the SPI interface.

This function is not designed to be a driver to handle all the conditions of the EEPROM device. The EEPROM contains a 32 byte write buffer which can be filled and then a write is automatically performed by the device. All the data put into the buffer must be in the same page of the device with page boundaries being on 32 byte boundaries.

Parameters

SpiPtr	is a pointer to the SPI driver instance to use.
Address	contains the address to write data to in the EEPROM.
ByteCount	contains the number of bytes to write.
Buffer	is a buffer of data to write from.

Returns

None.

Note

None.

int main

(

void

)

Main function to call the Spi Eeprom example.

Returns

XST_SUCCESS if successful, otherwise XST_FAILURE.

Note

None

References SpiPsEepromPolledExample().

int SpiPsEepromPolledExample	(	XSpiPs *	SpiInstancePtr,
		u16	SpiDeviceId
	)

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

This test writes and reads data from a serial EEPROM. The serial EEPROM part must be present in the hardware to use this example.

Parameters

SpiInstancePtr	is a pointer to the Spi Instance.
SpiDeviceId	is the Device Id of Spi.

Returns

XST_SUCCESS if successful else XST_FAILURE.

Note

This function calls 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, EepromRead(), EepromWrite(), XSpiPs_CfgInitialize(), XSPIPS_CLK_PRESCALE_64, XSPIPS_FORCE_SSELECT_OPTION, XSpiPs_LookupConfig(), XSPIPS_MASTER_OPTION, XSpiPs_SelfTest(), XSpiPs_SetClkPrescaler(), XSpiPs_SetOptions(), and XSpiPs_SetSlaveSelect().

Referenced by main().