RTOS/TM4C123GH6PM: INA219 I2C Communication Problem with TIVA C EK-TM4C123GXL

Hi Ralph Jacobi,

For I2C Communication I have used I2C1Channel. Initialization as follows:

    SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C1);

    /* Configure the appropriate pins to be I2C instead of GPIO. */
    GPIOPinConfigure(GPIO_PA6_I2C1SCL);
    GPIOPinConfigure(GPIO_PA7_I2C1SDA);
    GPIOPinTypeI2CSCL(GPIO_PORTA_BASE, GPIO_PIN_6);
    GPIOPinTypeI2C(GPIO_PORTA_BASE, GPIO_PIN_7);

I have configured void currentTask() as task. In this task when I tried to do I2cwrite using writeRegister()

void writeRegister(I2C_Handle handle, uint16_t regAddr, uint16_t value)
{
    uint8_t             txBuffer[4];
    I2C_Transaction     i2cTransaction;

    i2cTransaction.slaveAddress = CURR_I2C_ADDR;

     //Write to a 16-bit status register
    i2cTransaction.writeBuf = txBuffer;
    i2cTransaction.writeCount = 3;
    i2cTransaction.readCount = 0;

    txBuffer[0] = regAddr & 0xFF; // 8- Bit address
    txBuffer[1] = value >> 8; // HB Addr
    txBuffer[2] = value & 0xFF; // LB Addr

    if (!I2C_transfer(handle, &i2cTransaction)) {
        GPIO_write(Board_LED2, Board_LED_ON);
        System_abort("Bad I2C transfer!");
    }
}

for writing a calibration value to the register of address 0x05 using

writeRegister(i2c,0x05, 8192);

In this function after executing 

I2C_transfer(handle, &i2cTransaction)

(while debugging....)

control is not executing next line of code. when i tried to pause the debug. control is in Load_IdleFxn() in Load.c,some times in Idle_loop() in Idle.c.

I haven't used any external pull-up resistors for SCL and SDA lines.(I'm using TIVA C EK-TM4C123GXL launchpad. Do i need to add external pull - up resistors?) 

and my read function as follows (haven't executed this function as I can't come out of the I2C_transfer() of write register):

void readRegister(I2C_Handle handle,
                  uint16_t regAddr,
                  uint16_t *data,
                  size_t   length)
{
    uint8_t             txBuffer[2];
    I2C_Transaction     i2cTransaction;

    i2cTransaction.slaveAddress = CURR_I2C_ADDR;

    /* Write to a 16-bit status register */
    i2cTransaction.writeBuf = txBuffer;
    i2cTransaction.readBuf = data;
    i2cTransaction.writeCount = 1;
    i2cTransaction.readCount = length;

    txBuffer[0] = regAddr & 0xFF; //LB Addr

    if (!I2C_transfer(handle, &i2cTransaction)) {
        GPIO_write(Board_LED2, Board_LED_ON);
        System_abort("Bad I2C transfer!");
    }
}

Please help me, where I'm going wrong.

I don't have an oscilloscope to see what communication going on them.

Regards,

Yashwanth.

Hi Todd,

As you told I added I2C.c and I2CTiva.c files.

While debugging in step by step mode . After executing

        /*
         * Wait for the transfer to complete here.
         * It's OK to block from here because the I2C's Hwi will unblock
         * upon errors
         */
        Semaphore_pend(Semaphore_handle(&(object->transferComplete)),
                                        BIOS_WAIT_FOREVER);

in bool I2CTiva_transfer(I2C_Handle handle, I2C_Transaction *transaction) function in I2CTiva.c file

PC didn't came out of this line.

This means i'm doing something wrong in writing slave address,register address and value ?

Regards,

Yashwanth Kumar Gandeti.

Hello Todd,

Yeah I tapped the lines using Oscilloscope. The address of registers are not correct. I'll send the screenshot of oscilloscope.

I'm trying to correct the register address structuring.

Regards,

Yashwanth

HI Todd,

Please find the attached projects denoted :

Working_Project - Working .

NotWorking_Project - not Working .

Regards,

Yashwanth

Edit: Projects removed due to privacy issues of project