I2C hanging after sending address byte

[jose_asensio]

Hello everyone.

I am using MQX 4.2 and KSDK 1.3. Using the following code I am getting a hard fault exception but I am not sure where it comes from:

/////////////////////////////////////////

void I2C0_IRQHandler(void)

{

int i;

I2C_DRV_IRQHandler(I2C0_IDX);

}

void InitI2C(void)

{

MUTEX_ATTR_STRUCT mutexattr;

uint8_t txBuff[10], cmd[4];

uint8_t count = 3;

I2C_DRV_MasterInit(BOARD_I2C_INSTANCE, &i2cmaster);

I2C_DRV_MasterSendData(BOARD_I2C_INSTANCE, &device, cmd, 0, txBuff, 1);

}j

/////////////////////////////////////////

It seems to be happening at this point:

////////////////////////////////////////

static i2c_status_t I2C_DRV_MasterWait(uint32_t instance, uint32_t timeout_ms)

{

i2c_master_state_t * master = (i2c_master_state_t *)g_i2cStatePtr[instance];

osa_status_t syncStatus;

do {

    syncStatus = OSA_SemaWait(&master->irqSync, timeout_ms);   // After this point I2C hangs

} while(syncStatus == kStatus_OSA_Idle);

if (syncStatus != kStatus_OSA_Success)

    master->status = kStatus_I2C_Timeout;

return master->status;

}

////////////////////////////////////////

[jose_asensio]

Hi Daniel.

Thanks for your time.

I finally solved it installing an isr handler with this code:

void I2C_IRQHandler(void)
{
    OSA_SemaPost(&i2cmaster.irqSync);
    I2C_HAL_ClearInt(i2cbase);
}

[danielchen]

That's great, thanks for sharing

[jose_asensio]

I am trying to debug the exception. CFSR and HFSR registers contain:

CFSR = 0x00040000 (INVPC = 1)

HFSR = 0x40000000 (FORCED = 1)

I implemented my own handler for the exception and used it to dump stack contents and see what is going on. The offending instruction, located at 0x572:

bx lr

lr register contains value 0x92fb.Instruction at 0x92fa is:

adds r7, #8

So I  do not know what else I can do and why the exception is happening

[danielchen]

Hi Jose:

I copied your code into my project, and tested in TWR-K64 , not found this issue, could you create a simple project for us to reproduce your issue?

Regards

Daniel

[jose_asensio]

I checked with the scope that the address byte is being sent, but after that, unhandled interrupt happens and task is blocked.

Any idea?

Thanks