embeddedsw/XilinxProcessorIPLib/drivers/iicps/examples/xiicps_eeprom_polled_example.c

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/*****************************************************************************/
/**
* @file xiicps_eeprom_polled_example.c
*
* This file consists of a polled mode design example which uses the Xilinx PS
* IIC device and XIicPs driver to exercise the EEPROM.
*
* The XIicPs_MasterSendPolled() API is used to transmit the data and
* XIicPs_MasterRecvPolled() API is used to receive the data.
*
* The example is tested with a 2Kb/8Kb serial IIC EEPROM (ST M24C02/M24C08).
* The WP pin of this EEPROM is hardwired to ground in the HW in which this
* was tested.
*
* The AddressType should be u8 as the address pointer in the on-board
* EEPROM is 1 bytes.
*
* This code assumes that no Operating System is being used.
*
* @note
*
* None.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date     Changes
* ----- ---- -------- ---------------------------------------------------------
* 1.00a sdm  03/15/10 First release
* 1.01a sg   04/13/12 Added MuxInit function for initializing the IIC Mux
*		      on the ZC702 board and to configure it for accessing
*		      the IIC EEPROM.
*                     Updated to use usleep instead of delay loop
* 1.04a hk   09/03/13 Removed GPIO code to pull MUX out of reset - CR#722425.
* 2.3 	sk	 10/07/14 Removed multiple initializations for read buffer.
* </pre>
*
******************************************************************************/

/***************************** Include Files *********************************/

#include "xparameters.h"
#include "sleep.h"
#include "xiicps.h"
#include "xil_printf.h"
#include "xplatform_info.h"

/************************** Constant Definitions *****************************/

/*
 * The following constants map to the XPAR parameters created in the
 * xparameters.h file. They are defined here such that a user can easily
 * change all the needed parameters in one place.
 */
#define IIC_DEVICE_ID	XPAR_XIICPS_0_DEVICE_ID

/*
 * The following constant defines the address of the IIC Slave device on the
 * IIC bus. Note that since the address is only 7 bits, this constant is the
 * address divided by 2.
 */
#define IIC_SLAVE_ADDR		0x54
#define IIC_SCLK_RATE		100000
#define IIC_MUX_ADDRESS 	0x74

/*
 * The page size determines how much data should be written at a time.
 * The write function should be called with this as a maximum byte count.
 */
#define PAGE_SIZE		16

/*
 * The Starting address in the IIC EEPROM on which this test is performed.
 */
#define EEPROM_START_ADDRESS	128

/**************************** Type Definitions *******************************/

/*
 * The AddressType should be u8 as the address pointer in the on-board
 * EEPROM is 1 bytes.
 */
typedef u16 AddressType;

/***************** Macros (Inline Functions) Definitions *********************/

/************************** Function Prototypes ******************************/

int IicPsEepromPolledExample(void);
int EepromWriteData(u16 ByteCount);
int MuxInit(void);
int EepromReadData(u8 *BufferPtr, u16 ByteCount);

/************************** Variable Definitions *****************************/

XIicPs IicInstance;		/* The instance of the IIC device. */
u32 Platform;

/*
 * Write buffer for writing a page.
 */
u8 WriteBuffer[sizeof(AddressType) + PAGE_SIZE];

u8 ReadBuffer[PAGE_SIZE];	/* Read buffer for reading a page. */

/************************** Function Definitions *****************************/

/*****************************************************************************/
/**
* Main function to call the Iic EEPROM polled example.
*
* @param	None.
*
* @return	XST_SUCCESS if successful else XST_FAILURE.
*
* @note		None.
*
******************************************************************************/
int main(void)
{
	int Status;

	xil_printf("IIC EEPROM Polled Mode Example Test \r\n");

	/*
	 * Run the Iic EEPROM Polled Mode example.
	 */
	Status = IicPsEepromPolledExample();
	if (Status != XST_SUCCESS) {
		xil_printf("IIC EEPROM Polled Mode Example Test Failed\r\n");
		return XST_FAILURE;
	}

	xil_printf("Successfully ran IIC EEPROM Polled Mode Example Test\r\n");
	return XST_SUCCESS;
}

/*****************************************************************************/
/**
* This function writes, reads, and verifies the data to the IIC EEPROM. It
* does the write as a single page write, performs a buffered read.
*
* @param	None.
*
* @return	XST_SUCCESS if successful else XST_FAILURE.
*
* @note		None.
*
******************************************************************************/
int IicPsEepromPolledExample(void)
{
	u32 Index;
	int Status;
	XIicPs_Config *ConfigPtr;	/* Pointer to configuration data */
	AddressType Address = EEPROM_START_ADDRESS;
	int WrBfrOffset;

	/*
	 * Initialize the IIC driver so that it is ready to use.
	 */
	ConfigPtr = XIicPs_LookupConfig(IIC_DEVICE_ID);
	if (ConfigPtr == NULL) {
		return XST_FAILURE;
	}

	Status = XIicPs_CfgInitialize(&IicInstance, ConfigPtr,
					ConfigPtr->BaseAddress);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Set the IIC serial clock rate.
	 */
	XIicPs_SetSClk(&IicInstance, IIC_SCLK_RATE);

	/*
	 * Set the channel value in IIC Mux if
	 * it is Zynq platform
	 */
	Platform = XGetPlatform_Info();
	if(Platform == XPLAT_ZYNQ) {
		Status = MuxInit();
		if (Status != XST_SUCCESS) {
			return XST_FAILURE;
		}
	}

	/*
	 * Initialize the data to write and the read buffer.
	 */
	if (Platform == XPLAT_ZYNQ) {
		WriteBuffer[0] = (u8) (Address);
		WrBfrOffset = 1;
	} else {
		WriteBuffer[0] = (u8) (Address >> 8);
		WriteBuffer[1] = (u8) (Address);
		WrBfrOffset = 2;
	}

	for (Index = 0; Index < PAGE_SIZE; Index++) {
		WriteBuffer[WrBfrOffset + Index] = 0xFF;
		ReadBuffer[Index] = 0;
	}

	/*
	 * Write to the EEPROM.
	 */
	Status = EepromWriteData(WrBfrOffset + PAGE_SIZE);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Read from the EEPROM.
	 */
	Status = EepromReadData(ReadBuffer, PAGE_SIZE);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Verify the data read against the data written.
	 */
	for (Index = 0; Index < PAGE_SIZE; Index++) {
		if (ReadBuffer[Index] != WriteBuffer[Index + WrBfrOffset]) {
			return XST_FAILURE;
		}
	}

	/*
	 * Initialize the data to write and the read buffer.
	 */
	if (Platform == XPLAT_ZYNQ) {
		WriteBuffer[0] = (u8) (Address);
		WrBfrOffset = 1;
	} else {
		WriteBuffer[0] = (u8) (Address >> 8);
		WriteBuffer[1] = (u8) (Address);
		WrBfrOffset = 2;
	}

	for (Index = 0; Index < PAGE_SIZE; Index++) {
		WriteBuffer[WrBfrOffset + Index] = Index + 10;
		ReadBuffer[Index] = 0;
	}

	/*
	 * Write to the EEPROM.
	 */
	Status = EepromWriteData(WrBfrOffset + PAGE_SIZE);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Read from the EEPROM.
	 */
	Status = EepromReadData(ReadBuffer, PAGE_SIZE);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Verify the data read against the data written.
	 */
	for (Index = 0; Index < PAGE_SIZE; Index++) {
		if (ReadBuffer[Index] != WriteBuffer[Index + WrBfrOffset]) {
			return XST_FAILURE;
		}
	}

	return XST_SUCCESS;
}

/*****************************************************************************/
/**
* This function writes a buffer of data to the IIC serial EEPROM.
*
* @param	ByteCount contains the number of bytes in the buffer to be
*		written.
*
* @return	XST_SUCCESS if successful else XST_FAILURE.
*
* @note		The Byte count should not exceed the page size of the EEPROM as
*		noted by the constant PAGE_SIZE.
*
******************************************************************************/
int EepromWriteData(u16 ByteCount)
{
	int Status;

	/*
	 * Send the Data.
	 */
	Status = XIicPs_MasterSendPolled(&IicInstance, WriteBuffer,
					  ByteCount, IIC_SLAVE_ADDR);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Wait until bus is idle to start another transfer.
	 */
	while (XIicPs_BusIsBusy(&IicInstance));

	/*
	 * Wait for a bit of time to allow the programming to complete
	 */
	usleep(250000);

	return XST_SUCCESS;
}

/*****************************************************************************/
/**
* This function reads data from the IIC serial EEPROM into a specified buffer.
*
* @param	BufferPtr contains the address of the data buffer to be filled.
* @param	ByteCount contains the number of bytes in the buffer to be read.
*
* @return	XST_SUCCESS if successful else XST_FAILURE.
*
* @note		None.
*
******************************************************************************/
int EepromReadData(u8 *BufferPtr, u16 ByteCount)
{
	int Status;
	AddressType Address = EEPROM_START_ADDRESS;
	int WrBfrOffset;

	/*
	 * Position the Pointer in EEPROM.
	 */
	if (Platform == XPLAT_ZYNQ) {
		WriteBuffer[0] = (u8) (Address);
		WrBfrOffset = 1;
	} else {
		WriteBuffer[0] = (u8) (Address >> 8);
		WriteBuffer[1] = (u8) (Address);
		WrBfrOffset = 2;
	}

	Status = EepromWriteData(WrBfrOffset);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Receive the Data.
	 */
	Status = XIicPs_MasterRecvPolled(&IicInstance, BufferPtr,
					  ByteCount, IIC_SLAVE_ADDR);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Wait until bus is idle to start another transfer.
	 */
	while (XIicPs_BusIsBusy(&IicInstance));

	return XST_SUCCESS;
}

/*****************************************************************************/
/**
* This function initializes the IIC MUX to select EEPROM.
*
* @param	None.
*
* @return	XST_SUCCESS if pass, otherwise XST_FAILURE.
*
* @note		None.
*
****************************************************************************/
int MuxInit(void)
{
	u8 WriteBuffer;
	u8 MuxIicAddr = IIC_MUX_ADDRESS;
	u8 Buffer = 0;
	int Status = 0;

	/*
	 * Channel select value for EEPROM.
	 */
	WriteBuffer = 0x04;

	/*
	 * Send the Data.
	 */
	Status = XIicPs_MasterSendPolled(&IicInstance, &WriteBuffer,1,
					MuxIicAddr);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Wait until bus is idle to start another transfer.
	 */
	while (XIicPs_BusIsBusy(&IicInstance));

	/*
	 * Receive the Data.
	 */
	Status = XIicPs_MasterRecvPolled(&IicInstance, &Buffer,1, MuxIicAddr);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Wait until bus is idle to start another transfer.
	 */
	while (XIicPs_BusIsBusy(&IicInstance));

	return XST_SUCCESS;
}