iic
Xilinx Vitis Drivers API Documentation
xiic_low_level_eeprom_example.c File Reference

Overview

This file consists of a polled mode design example which uses the Xilinx IIC device and low-level driver to exercise the EEPROM.

This example writes/reads from the lower 256 bytes of the IIC EEPROMS. Please refer to the datasheets of the IIC EEPROM's for details about the internal addressing and page size of these devices.

The XIic_Send() API is used to transmit the data and XIic_Recv() API is used to receive the data.

This example is tested on ML300/ML310/ML403/ML501/ML507/ML510/ML605/SP601 and SP605 Xilinx boards.

The ML310/ML410/ML510 boards have a on-board 64 Kb serial IIC EEPROM (Microchip 24LC64A). The WP pin of the IIC EEPROM is hardwired to ground on this board.

The ML300 board has an on-board 32 Kb serial IIC EEPROM(Microchip 24LC32A). The WP pin of the IIC EEPROM has to be connected to ground for this example. The WP is connected to pin Y3 of the FPGA.

The ML403 board has an on-board 4 Kb serial IIC EEPROM(Microchip 24LC04A). The WP pin of the IIC EEPROM is hardwired to ground on this board.

The ML501/ML505/ML507/ML605/SP601/SP605 boards have an on-board 8 Kb serial IIC EEPROM(STM M24C08). The WP pin of the IIC EEPROM is hardwired to ground on these boards.

The AddressType for ML300/ML310/ML410/ML510 boards should be u16 as the address pointer in the on board EEPROM is 2 bytes.

The AddressType for ML403/ML501/ML505/ML507/ML605/SP601/SP605 boards should be u8 as the address pointer for the on board EEPROM is 1 byte.

The 7 bit IIC Slave address of the IIC EEPROM on the ML300/ML310/ML403/ML410/ ML501/ML505/ML507/ML510 boards is 0x50. The 7 bit IIC Slave address of the IIC EEPROM on the ML605/SP601/SP605 boards is 0x54. Refer to the User Guide's of the respective boards for further information about the IIC slave address of IIC EEPROM's.

The define EEPROM_ADDRESS in this file needs to be changed depending on the board on which this example is to be run.

This code assumes that no Operating System is being used.

Note
None
MODIFICATION HISTORY:
Ver     Who  Date        Changes


1.00a jhl 09/10/03 Created 1.00a sv 05/09/05 Minor changes to comply to Doxygen and coding guidelines 1.00a mta 03/09/06 Minor updates due to changes in the low level driver for supporting repeated start functionality. 2.00a sdm 09/22/09 Converted all register accesses to 32 bit access and minor modifications as per coding guidelines. 2.01a ktn 03/17/10 Updated the information about the EEPROM's used on ML605/SP601/SP605 boards. Updated the example so that it can be used to access the entire IIC EEPROM for devices like M24C04/M24C08 that use LSB bits of the IIC device select code (IIC slave address) to specify the higher address bits of the EEPROM internal address. 2.01a sdm 06/13/11 Updated the example to flush the Tx FIFO when waiting for the previous command to be completed for CR612546. 3.4 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. 3.5 sd 08/29/18 Update the fifo flush.

Functions

int IicLowLevelEeprom (void)
 The function uses the low level driver of IIC to read and write to the IIC EEPROM board. More...
 
int ReadWriteVerify (AddressType Address)
 This function writes, reads, and verifies the read to the IIC EEPROM. More...
 
unsigned EepromWriteByte (AddressType Address, u8 *BufferPtr, u16 ByteCount)
 This function writes a buffer of bytes to the IIC serial EEPROM. More...
 
unsigned EepromReadByte (AddressType Address, u8 *BufferPtr, u16 ByteCount)
 This function reads a number of bytes from the IIC serial EEPROM into a specified buffer. More...
 
int main (void)
 Main function to call the low level EEPROM example. More...
 

Function Documentation

unsigned EepromReadByte ( AddressType  Address,
u8 *  BufferPtr,
u16  ByteCount 
)

This function reads a number of bytes from the IIC serial EEPROM into a specified buffer.

Parameters
Addresscontains the address in the EEPROM to read from.
BufferPtrcontains the address of the data buffer to be filled.
ByteCountcontains the number of bytes in the buffer to be read. This value is not constrained by the page size of the device such that up to 64K may be read in one call.
Returns
The number of bytes read. A value less than the specified input value indicates an error.
Note
None.

References XIIC_CR_ENABLE_DEVICE_MASK, XIIC_CR_REG_OFFSET, XIIC_CR_TX_FIFO_RESET_MASK, XIic_ReadReg, XIic_Recv(), XIic_Send(), XIIC_SR_BUS_BUSY_MASK, XIIC_SR_REG_OFFSET, XIIC_STOP, and XIic_WriteReg.

Referenced by IicLowLevelEeprom(), and ReadWriteVerify().

unsigned EepromWriteByte ( AddressType  Address,
u8 *  BufferPtr,
u16  ByteCount 
)

This function writes a buffer of bytes to the IIC serial EEPROM.

Parameters
Addresscontains the address in the EEPROM to write to.
BufferPtrcontains the address of the data to write.
ByteCountcontains the number of bytes in the buffer to be written. Note that this should not exceed the page size of the EEPROM as noted by the constant PAGE_SIZE.
Returns
The number of bytes written, a value less than that which was specified as an input indicates an error.
Note
None.

References XIIC_CR_ENABLE_DEVICE_MASK, XIIC_CR_REG_OFFSET, XIIC_CR_TX_FIFO_RESET_MASK, XIic_ReadReg, XIic_Send(), XIIC_STOP, and XIic_WriteReg.

int IicLowLevelEeprom ( void  )

The function uses the low level driver of IIC to read and write to the IIC EEPROM board.

The addresses tested are from 128 to 192.

Returns
XST_SUCCESS if successful, XST_FAILURE if unsuccessful.
Note
None.

References EepromReadByte(), and ReadWriteVerify().

Referenced by main().

int main ( void  )

Main function to call the low level EEPROM example.

Returns
XST_SUCCESS if successful, XST_FAILURE if unsuccessful.
Note
None.

References IicLowLevelEeprom().

int ReadWriteVerify ( AddressType  Address)

This function writes, reads, and verifies the read to the IIC EEPROM.

It does the write as a single page write, performs a buffered read, and also performs byte reads.

Parameters
Addressis the starting address of the page in the EEPROM device to which the data is to be written.
Returns
XST_FAILURE if the test fails, XST_SUCCESS if the test passes.
Note
None.

References EepromReadByte(), and EepromWriteByte().

Referenced by IicLowLevelEeprom().