Hello, I've got a custom board with TM4C1294NCPDT part running TI RTOS and trying to debug an issue with I2C3. For some reason, the I2C_transfer() call fails when running under the debugger and I see no data going out the pins. However, if I reboot outside the debugger I can see data clocking out to an EPROM I'm trying to communicate with. Any ideas? My read logic and I2C driver init code is listed below, but the device still doesn't seem to be responding when it runs outside the debugger even though I see data clocking out. I'm new the I2C EPROM also and may not be addressing it properly with the RTOS I2C calls also.
Thanks,
Bob
int ReadSerialNumber(uint8_t ui8SerialNumber[16])
{
bool ret;
uint8_t txBuf[2];
I2C_Handle handle;
I2C_Params params;
I2C_Transaction i2cTransaction;
/* default invalid serial number is all FF's */
memset(ui8SerialNumber, 0xFF, sizeof(ui8SerialNumber));
I2C_Params_init(¶ms);
params.transferMode = I2C_MODE_BLOCKING;
params.transferCallbackFxn = NULL;
params.bitRate = I2C_100kHz;
handle = I2C_open(Board_I2C_AT24CS01, ¶ms);
if (!handle) {
System_printf("I2C did not open\n");
System_flush();
return 0;
}
/* Note the Upper bit of the word address must be set
* in order to read the serial number. Thus 80H would
* set the starting address to zero prior to reading
* this sixteen bytes of serial number data.
*/
txBuf[0] = 0x80;
txBuf[1] = 0x00;
i2cTransaction.writeBuf = txBuf;
i2cTransaction.writeCount = 1;
i2cTransaction.readBuf = NULL;
i2cTransaction.readCount = 0;
i2cTransaction.slaveAddress = Board_AT24CS01_SERIAL_ADDR;
ret = I2C_transfer(handle, &i2cTransaction);
i2cTransaction.writeBuf = txBuf;
i2cTransaction.writeCount = 1;
i2cTransaction.readBuf = ui8SerialNumber;
i2cTransaction.readCount = 16;
i2cTransaction.slaveAddress = Board_AT24CS01_SERIAL_ADDR;
ret = I2C_transfer(handle, &i2cTransaction);
if (!ret)
{
System_printf("Unsuccessful I2C transfer\n");
System_flush();
}
I2C_close(handle);
return ret;
}
//// DRIVER INIT CODE ////////////////////////////////////////////////////
#include <ti/drivers/I2C.h>
#include <ti/drivers/i2c/I2CTiva.h>
/* I2C objects */
I2CTiva_Object i2cTivaObjects[PMX42_I2CCOUNT];
/* I2C configuration structure, describing which pins are to be used */
const I2CTiva_HWAttrs i2cTivaHWAttrs[PMX42_I2CCOUNT] = {
{I2C0_BASE, INT_I2C0},
{I2C1_BASE, INT_I2C1},
{I2C2_BASE, INT_I2C2},
{I2C3_BASE, INT_I2C3}
};
const I2C_Config I2C_config[] = {
{&I2CTiva_fxnTable, &i2cTivaObjects[0], &i2cTivaHWAttrs[0]},
{&I2CTiva_fxnTable, &i2cTivaObjects[1], &i2cTivaHWAttrs[1]},
{&I2CTiva_fxnTable, &i2cTivaObjects[2], &i2cTivaHWAttrs[2]},
{&I2CTiva_fxnTable, &i2cTivaObjects[3], &i2cTivaHWAttrs[3]},
{NULL, NULL, NULL}
};
/*
* ======== PMX42_initI2C ========
*/
void PMX42_initI2C(void)
{
/* I2C0 Init */
/* Enable the peripheral */
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0);
/* Configure the appropriate pins to be I2C instead of GPIO. */
GPIOPinConfigure(GPIO_PB2_I2C0SCL);
GPIOPinConfigure(GPIO_PB3_I2C0SDA);
GPIOPinTypeI2CSCL(GPIO_PORTB_BASE, GPIO_PIN_2);
GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_3);
/* I2C1 Init */
/* Enable the peripheral */
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C1);
/* Configure the appropriate pins to be I2C instead of GPIO. */
GPIOPinConfigure(GPIO_PG0_I2C1SCL);
GPIOPinConfigure(GPIO_PG1_I2C1SDA);
GPIOPinTypeI2CSCL(GPIO_PORTG_BASE, GPIO_PIN_0);
GPIOPinTypeI2C(GPIO_PORTG_BASE, GPIO_PIN_1);
/* I2C2 Init */
/* Enable the peripheral */
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C2);
/* Configure the appropriate pins to be I2C instead of GPIO. */
GPIOPinConfigure(GPIO_PL1_I2C2SCL);
GPIOPinConfigure(GPIO_PL0_I2C2SDA);
GPIOPinTypeI2CSCL(GPIO_PORTL_BASE, GPIO_PIN_1);
GPIOPinTypeI2C(GPIO_PORTL_BASE, GPIO_PIN_0);
/* I2C3 Init */
/* Enable the peripheral */
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C3);
/* Configure the appropriate pins to be I2C instead of GPIO. */
GPIOPinConfigure(GPIO_PK4_I2C3SCL);
GPIOPinConfigure(GPIO_PK5_I2C3SDA);
GPIOPinTypeI2CSCL(GPIO_PORTK_BASE, GPIO_PIN_4);
GPIOPinTypeI2C(GPIO_PORTK_BASE, GPIO_PIN_5);
I2C_init();
}
#include <ti/drivers/I2C.h>
#include <ti/drivers/i2c/I2CTiva.h>
/* I2C objects */
I2CTiva_Object i2cTivaObjects[PMX42_I2CCOUNT];
/* I2C configuration structure, describing which pins are to be used */
const I2CTiva_HWAttrs i2cTivaHWAttrs[PMX42_I2CCOUNT] = {
{I2C0_BASE, INT_I2C0},
{I2C1_BASE, INT_I2C1},
{I2C2_BASE, INT_I2C2},
{I2C3_BASE, INT_I2C3}
};
const I2C_Config I2C_config[] = {
{&I2CTiva_fxnTable, &i2cTivaObjects[0], &i2cTivaHWAttrs[0]},
{&I2CTiva_fxnTable, &i2cTivaObjects[1], &i2cTivaHWAttrs[1]},
{&I2CTiva_fxnTable, &i2cTivaObjects[2], &i2cTivaHWAttrs[2]},
{&I2CTiva_fxnTable, &i2cTivaObjects[3], &i2cTivaHWAttrs[3]},
{NULL, NULL, NULL}
};
/*
* ======== PMX42_initI2C ========
*/
void PMX42_initI2C(void)
{
/* I2C0 Init */
/* Enable the peripheral */
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0);
/* Configure the appropriate pins to be I2C instead of GPIO. */
GPIOPinConfigure(GPIO_PB2_I2C0SCL);
GPIOPinConfigure(GPIO_PB3_I2C0SDA);
GPIOPinTypeI2CSCL(GPIO_PORTB_BASE, GPIO_PIN_2);
GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_3);
/* I2C1 Init */
/* Enable the peripheral */
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C1);
/* Configure the appropriate pins to be I2C instead of GPIO. */
GPIOPinConfigure(GPIO_PG0_I2C1SCL);
GPIOPinConfigure(GPIO_PG1_I2C1SDA);
GPIOPinTypeI2CSCL(GPIO_PORTG_BASE, GPIO_PIN_0);
GPIOPinTypeI2C(GPIO_PORTG_BASE, GPIO_PIN_1);
/* I2C2 Init */
/* Enable the peripheral */
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C2);
/* Configure the appropriate pins to be I2C instead of GPIO. */
GPIOPinConfigure(GPIO_PL1_I2C2SCL);
GPIOPinConfigure(GPIO_PL0_I2C2SDA);
GPIOPinTypeI2CSCL(GPIO_PORTL_BASE, GPIO_PIN_1);
GPIOPinTypeI2C(GPIO_PORTL_BASE, GPIO_PIN_0);
/* I2C3 Init */
/* Enable the peripheral */
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C3);
/* Configure the appropriate pins to be I2C instead of GPIO. */
GPIOPinConfigure(GPIO_PK4_I2C3SCL);
GPIOPinConfigure(GPIO_PK5_I2C3SDA);
GPIOPinTypeI2CSCL(GPIO_PORTK_BASE, GPIO_PIN_4);
GPIOPinTypeI2C(GPIO_PORTK_BASE, GPIO_PIN_5);
I2C_init();
}
