TM4C129ENCPDT: I2C2 - I2CMasterBusy(I2C2_BASE)

Part Number: TM4C129ENCPDT

Hi all,

I'm trying to get some data from an I2C slave, but the program gets stuck in I2CMasterBusy(I2C2_BASE), when using I2C2. I can't get any signal with the scope. I have pull-up resistors in SCL and SDA.

When I try to use I2C5, it works fine.

I can get some direction in this issue, please?

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_i2c.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/i2c.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"

#define SLAVE_ADDRESS 0b10011010
#define REGISTER    0x00


//read specified register on slave device
uint32_t I2CReceive(uint8_t slave_addr, uint8_t reg)
{
    //specify that we are writing (a register address) to the
    //slave device
    I2CMasterSlaveAddrSet(I2C2_BASE, slave_addr, false);

    //specify register to be read
    I2CMasterDataPut(I2C2_BASE, reg);

    //send control byte and register address byte to slave device
    I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_SEND_START);

    SysCtlDelay(100);
    //wait for MCU to finish transaction
    while(!(I2CMasterBusy(I2C2_BASE)));
    SysCtlDelay(100);
    while(I2CMasterBusy(I2C2_BASE));

    //specify that we are going to read from slave device
    I2CMasterSlaveAddrSet(I2C2_BASE, slave_addr, true);

    //send control byte and read from the register we
    //specified
    I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE);

    SysCtlDelay(100);
    //wait for MCU to finish transaction
    while(!(I2CMasterBusy(I2C2_BASE)));
    SysCtlDelay(100);
    while(I2CMasterBusy(I2C2_BASE));

    //return data pulled from the specified register
    return I2CMasterDataGet(I2C2_BASE);
}

//*****************************************************************************
//
// Configure the I2C5 master.
//
//*****************************************************************************
volatile uint32_t test = 0;
void
main(void)
{
    uint32_t ui32SysClock;

    ui32SysClock =     SysCtlClockFreqSet((SYSCTL_OSC_INT | SYSCTL_USE_PLL |
            SYSCTL_CFG_VCO_480), 120000000);

    //
    // The I2C2 peripheral must be enabled before use.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C2);
    while(!SysCtlPeripheralReady(SYSCTL_PERIPH_I2C2))
    {}

    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPION);

    GPIOPinConfigure(GPIO_PN4_I2C2SDA);
    GPIOPinConfigure(GPIO_PN5_I2C2SCL);

    GPIOPinTypeI2CSCL(GPIO_PORTN_BASE, GPIO_PIN_5);
    GPIOPinTypeI2C(GPIO_PORTN_BASE, GPIO_PIN_4);

    I2CMasterInitExpClk(I2C2_BASE, ui32SysClock, false);


    // Enable Power in External Conector
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);
    GPIOPinTypeGPIOOutput(GPIO_PORTJ_BASE, GPIO_PIN_0);
    GPIOPinWrite(GPIO_PORTJ_BASE, GPIO_PIN_0, ~0);

    for(;;) {
        test = I2CReceive(REGISTER, ID_ADDRESS);
        SysCtlDelay(60000000); //~500 ms
    }

}