Part Number: CC2640R2F
Other Parts Discussed in Thread: TMP102
Dear sir ,
i am trying to interface EEPROM IC 24C16A using I2C.
i am getting FF reading from the EEPROM. please check my code & suggest.
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/*
* ======== i2ctmp007.c ========
*/
#include <stdint.h>
#include <stddef.h>
#include <unistd.h>
/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/I2C.h>
#include <ti/display/Display.h>
/* Example/Board Header files */
#include "Board.h"
#define TASKSTACKSIZE 640
#define TMP007_DIE_TEMP 0x01 //0x0000 /* Die Temp Result Register */
#define TMP007_OBJ_TEMP 0x0003 /* Object Temp Result Register */
static Display_Handle display;
/*
* ======== mainThread ========
*/
void *mainThread(void *arg0)
{
unsigned int i;
uint8_t EEDATA0;
uint8_t EEDATA1;
uint8_t txBuffer1[1];
uint8_t txBuffer2[1];
uint8_t txBuffer3[1];
uint8_t rxBuffer[2];
I2C_Handle i2c;
I2C_Params i2cParams;
I2C_Transaction i2cTransaction;
/* Call driver init functions */
Display_init();
GPIO_init();
I2C_init();
/* Open the HOST display for output */
display = Display_open(Display_Type_UART, NULL);
if (display == NULL) {
while (1);
}
/* Turn on user LED */
GPIO_write(Board_GPIO_LED0, Board_GPIO_LED_ON);
Display_printf(display, 0, 0, "Starting the i2ctmp007 example\n");
/* Create I2C for usage */
I2C_Params_init(&i2cParams);
// i2cParams.bitRate = I2C_400kHz;
i2c = I2C_open(Board_I2C_TMP, &i2cParams);
if (i2c == NULL)
{
Display_printf(display, 0, 0, "Error Initializing I2C\n");
while (1);
}
else
{
Display_printf(display, 0, 0, "I2C Initialized!\n");
}
//--------------------------------------------------------------------------------------
/* Point to the T ambient register and read its 2 bytes */
// txBuffer[0] = 0xA0; //EEPROM Device address + Write
// txBuffer[1] = 0xA0;
txBuffer1[0] = 0x55; //EEPROM Word Address
txBuffer2[0] = 0xAA; //EEPROM Data
txBuffer3[0] = 0xA1; //EEPROM Device address + Read
/* Take 20 samples and print them out onto the console */
while(1) {
i2cTransaction.slaveAddress = 0xA0;
usleep(2);
i2cTransaction.writeBuf = txBuffer1;
usleep(2);
i2cTransaction.writeBuf = txBuffer2;
usleep(2);
i2cTransaction.writeBuf = txBuffer3; //
i2cTransaction.writeCount = 1;
usleep(2);
i2cTransaction.readBuf = rxBuffer;
i2cTransaction.readCount = 1;
I2C_transfer(i2c, &i2cTransaction);
// if (I2C_transfer(i2c, &i2cTransaction))
// {
/* Extract degrees C from the received data; see TMP102 datasheet */
// temperature = (rxBuffer[0] << 6) | (rxBuffer[1] >> 2);
/*
* If the MSB is set '1', then we have a 2's complement
* negative value which needs to be sign extended
*/
// if (rxBuffer[0] & 0x80) {
// temperature |= 0xF000;
// }
/*
* For simplicity, divide the temperature value by 32 to get rid of
* the decimal precision; see TI's TMP007 datasheet
*/
// temperature /= 32;
EEDATA0 = rxBuffer[0];
EEDATA1 = rxBuffer[1];
Display_printf(display, 0, 0, "Sample %u: %d \n", i, EEDATA0);
Display_printf(display, 0, 0, "Sample %u: %d \n", i, EEDATA1);
// }
// else {
// Display_printf(display, 0, 0, "I2C Bus fault\n");
// }
/* Sleep for 1 second */
sleep(2);
}//End while1
/* Deinitialized I2C */
I2C_close(i2c);
Display_printf(display, 0, 0, "I2C closed!\n");
return (NULL);
}//end main
