Help with the RTC-8564 in ZC702 evaluation board of xilinx

#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_RTC_ADDR_WR		0xA2;
#define IIC_RTC_ADDR_RD		0xA3
//#define IIC_SCLK_RATE		400000 // 400KHz
#define IIC_SCLK_RATE		100000 // 100KHz
#define IIC_MUX_ADDRESS 	0x74

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

void IicPSComStart(void);
void RTCReadData(void);
void MuxInit(void);


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

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


/************************** Function Definitions *****************************/
int main(void)
{

	xil_printf("Start \r\n");

	// Launching I2C communication
	IicPSComStart();

	xil_printf("End\r\n");

	return 0;
}

void IicPSComStart(void)
{
	XIicPs_Config *ConfigPtr;	/* Pointer to configuration data */


	//Initialize the IIC driver so that it is ready to use.
	ConfigPtr = XIicPs_LookupConfig(IIC_DEVICE_ID);
	XIicPs_CfgInitialize(&IicInstance, ConfigPtr, ConfigPtr->BaseAddress);

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

	// Configure the IIC Switch
	Platform = XGetPlatform_Info();
	if(Platform == XPLAT_ZYNQ)
		MuxInit();

	RTCReadData();

}

void RTCReadData(void)
{
	u8 WriteBuffer;
	u8  RtcWrAddr = IIC_RTC_ADDR_WR;

	// Send Data
	WriteBuffer = 0x06;
	XIicPs_MasterSendPolled(&IicInstance, &WriteBuffer, 1, RtcWrAddr);

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

}

void MuxInit(void)
{
	u8 WriteBuffer;
	u8 MuxIicAddr = IIC_MUX_ADDRESS;
	u8 Buffer = 0;

	//Channel select value for RTC.
	WriteBuffer = 0x10;

	// Send the Data.
	XIicPs_MasterSendPolled(&IicInstance, &WriteBuffer,1, MuxIicAddr);

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

	//Receive the Data.
	XIicPs_MasterRecvPolled(&IicInstance, &Buffer,1, MuxIicAddr);

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

	//Wait some us
	usleep(100);
}

flote21 said:

Hello people,

I am trying to run this Real Time Clock module but I am not lucky. I have been using like starting point the xiicps_eeprom_polled_example.c provided by xilinx in the folder "drivers" of the installation path. I did some modifications to adpat this code to the RTC and I have trying to send just an address+data byte to the RTC using the function "XIicPs_MasterSendPolled". However I am only able to see that the Address is sent correctly, however the data byte is not sent. (See the code attached)

Some considerations:
- I want to connect to the RTC through a SDK standalone project.
- The switch is working properly because the oscilloscope pictures attached were taken directly in the I2C pins of the RTC-8564. I soldered two cables direcly on the chip to check if the signals were driven to the chip.

Regards,
Enrique Perez

Code:

#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_RTC_ADDR_WR		0xA2;
#define IIC_RTC_ADDR_RD		0xA3
//#define IIC_SCLK_RATE		400000 // 400KHz
#define IIC_SCLK_RATE		100000 // 100KHz
#define IIC_MUX_ADDRESS 	0x74

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

void IicPSComStart(void);
void RTCReadData(void);
void MuxInit(void);


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

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


/************************** Function Definitions *****************************/
int main(void)
{

	xil_printf("Start \r\n");

	// Launching I2C communication
	IicPSComStart();

	xil_printf("End\r\n");

	return 0;
}

void IicPSComStart(void)
{
	XIicPs_Config *ConfigPtr;	/* Pointer to configuration data */


	//Initialize the IIC driver so that it is ready to use.
	ConfigPtr = XIicPs_LookupConfig(IIC_DEVICE_ID);
	XIicPs_CfgInitialize(&IicInstance, ConfigPtr, ConfigPtr->BaseAddress);

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

	// Configure the IIC Switch
	Platform = XGetPlatform_Info();
	if(Platform == XPLAT_ZYNQ)
		MuxInit();

	RTCReadData();

}

void RTCReadData(void)
{
	u8 WriteBuffer;
	u8  RtcWrAddr = IIC_RTC_ADDR_WR;

	// Send Data
	WriteBuffer = 0x06;
	XIicPs_MasterSendPolled(&IicInstance, &WriteBuffer, 1, RtcWrAddr);

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

}

void MuxInit(void)
{
	u8 WriteBuffer;
	u8 MuxIicAddr = IIC_MUX_ADDRESS;
	u8 Buffer = 0;

	//Channel select value for RTC.
	WriteBuffer = 0x10;

	// Send the Data.
	XIicPs_MasterSendPolled(&IicInstance, &WriteBuffer,1, MuxIicAddr);

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

	//Receive the Data.
	XIicPs_MasterRecvPolled(&IicInstance, &Buffer,1, MuxIicAddr);

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

	//Wait some us
	usleep(100);
}

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