RTC Enabling in TM4C123

Hi,

I am using external FRAM(FM3164) for RTC. I did the program using i2c communication,but I am getting error status as 0x0000000C and the output as garbage value. What this error status means. why it is coming.I am using pull up resistor(4.7K) in SCL and SDA lines.

I am attaching the code below,

#define RTC_SLAVE_ADDRESS 0xD0  
void FRAM_I2C_Config()
{
	ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0);
	while (!SysCtlPeripheralReady(SYSCTL_PERIPH_I2C0));
	
	
	ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
	while (!SysCtlPeripheralReady(SYSCTL_PERIPH_GPIOB));
	
	ROM_GPIOPinConfigure(GPIO_PB2_I2C0SCL);
	ROM_GPIOPinTypeI2CSCL(GPIO_PORTB_BASE, GPIO_PIN_2);		
	
	ROM_GPIOPinConfigure(GPIO_PB3_I2C0SDA);
	ROM_GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_3);			 
	
	
	ROM_I2CMasterInitExpClk(I2C0_BASE, SysCtlClockGet(), true);	/* Set clock speed for I2C command , ture=400kHz, false=100kHz*/
	
}
int main()
{
    system_init();
while(1)
{

    TimerBuffer[0]= FRAM_RTCRead_Bck(0x00);//RTC Control
    TimerBuffer[0]= FRAM_RTCRead_Bck(0x01);//CAL control
    TimerBuffer[0]= FRAM_RTCRead_Bck(0x02);//seconds

    TimerBuffer[0]= FRAM_RTCRead_Bck(0x03);//minute

    TimerBuffer[0]= FRAM_RTCRead_Bck(0x04);//Hour
    TimerBuffer[0]= FRAM_RTCRead_Bck(0x05);//Day
    TimerBuffer[0]= FRAM_RTCRead_Bck(0x06);//Date
    TimerBuffer[0]= FRAM_RTCRead_Bck(0x07);//Month
     TimerBuffer[0]= FRAM_RTCRead_Bck(0x08);//Year

}
}

unsigned char FRAM_RTCRead_Bck(unsigned char Ctrl_reg_addrss)
{
	volatile unsigned int error_status = 0;
	unsigned char Read_Bck_Value = 0;
	
	/***************************************SEND WRITE LOCATION TO FRAM********************************************************/
	ROM_I2CMasterSlaveAddrSet(I2C0_BASE, RTC_SLAVE_ADDRESS, false);		// I2C in Master Transit Mode, true=Receive mode, false=Transit mode
		
	ROM_I2CMasterDataPut(I2C0_BASE, Ctrl_reg_addrss);												// Send MSB Address Byte
	ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_START);
	while (ROM_I2CMasterBusy(I2C0_BASE));
	error_status = ROM_I2CMasterErr(I2C0_BASE);
	
	ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);
	while (ROM_I2CMasterBusy(I2C0_BASE));
	error_status = ROM_I2CMasterErr(I2C0_BASE);
	
	/***************************************READ FROM FRAM*********************************************************************/
	ROM_I2CMasterSlaveAddrSet(I2C0_BASE, RTC_SLAVE_ADDRESS, true);			// I2C in Receive Mode, true=Receive mode, false=Transit mode
	
	ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);		// Start Receive
	while (ROM_I2CMasterBusy(I2C0_BASE));
	error_status = ROM_I2CMasterErr(I2C0_BASE);
	
	Read_Bck_Value = ROM_I2CMasterDataGet(I2C0_BASE);												// get the Data from the FRAM
	ROM_I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
	while (ROM_I2CMasterBusy(I2C0_BASE));
	error_status = ROM_I2CMasterErr(I2C0_BASE);
	
	return Read_Bck_Value;	
}

Please let me know why that error is coming and how to solve the issue.

Thank you,

Alphy

Hi sir,

Thank you sir,The slave address what you gave is right only. I am able to read and write data in to the registers. But if I am writing 0x05 to register 0x02 and 0x08 to register 0x03 then while reading from the register I will get 0x00 from register 0x02 and 0x05 from 0x03. similarly for all other registers I am getting previous write values. Why the write value to a register is coming in the next register. Is there any issue with the program.

Another issue I am facing is with RTC. The RTC is not changing values. I have connected a 32.768KHz crystall at the X1 and X2 terminal of the IC and made the OSEN pin low in programming(Oscillator Enable. When set to ‘1’, the oscillator is halted. When set to ‘0’, the oscillator starts running after tOSC time). but not getting any time change output while reading the register. Is there any other configuration is for enabling the RTC. If anyone in this forum worked on FM3164 FRAM please let me know what we need to do for making the RTC working properly. 

Thank you,

Alphy

Sorry, Texas Instruments does not make the  FM3164 FRAM device and I have no experience with it. Perhaps some member of this forum has used it before, but I did not see any other posts that referenced this device. Your best bet would be to contact the manufacturer of that device.