topic Re: Having a lockup in the I2C code in LPC Microcontrollers

Having a lockup in the I2C code

jeffjacobson — Wed, 21 Mar 2018 18:42:37 GMT

I am using lpcopen_2_10_keil_iar_nxp_lpcxpresso_1769 and having random lockups in this code in bold:

/* Chip event handler interrupt based */
void Chip_I2C_EventHandler(I2C_ID_T id, I2C_EVENT_T event)
{
struct i2c_interface *iic = &i2c[id];
volatile I2C_STATUS_T *stat;

   /* Only WAIT event needs to be handled */
   if (event != I2C_EVENT_WAIT) {
       return;
   }

   stat = &iic->mXfer->status;
   /* Wait for the status to change */
   while (*stat == I2C_STATUS_BUSY) {}
}

My code will run sometimes minute, sometimes once. When it hangs it is always there. The fact that a library has a dead loop is bad enough.

Has anyone seen issues with these libraries? Any thoughts on could be hanging the I2C bus? I scoped the lines and power and all are very clean.

Any direction would be great.

Thanks, Jeff

Re: Having a lockup in the I2C code

kerryzhou — Fri, 23 Mar 2018 09:30:21 GMT

Hi Jeff,

When you scope the I2C lines, and the problem happens, any abnormal things? You also can insert your I2C bus wave.

Please tell me your LPC1769 is the I2C master or the slave? Then I will do the test on my side.

Have a great day,
Kerry

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Re: Having a lockup in the I2C code

asobralg1 — Mon, 30 Sep 2019 23:10:06 GMT

Dear Community, specially Kerry:

I still have this problem, the code is running on a loop during the while while (*stat == I2C_STATUS_BUSY).

I'm using a LPC1769. I'll attacht the configuration function, just to share, i think that the problem isn't there.

void Chip_I2C_EventHandlerPolling(I2C_ID_T id, I2C_EVENT_T event)
{
struct i2c_interface *iic = &i2c[id];
volatile I2C_STATUS_T *stat;

/* Only WAIT event needs to be handled */
if (event != I2C_EVENT_WAIT) {
return;
}

stat = &iic->mXfer->status;
/* Call the state change handler till xfer is done */
while (*stat == I2C_STATUS_BUSY) {
if (Chip_I2C_IsStateChanged(id)) {
Chip_I2C_MasterStateHandler(id);
}
}
}

void init_memoriai2c (void)
{
//Inicializo i2c de la memoria
Chip_IOCON_PinMux(LPC_IOCON, I2C_DEVICE_PORT, I2C_SDA_PIN, IOCON_MODE_INACT, IOCON_FUNC3);
Chip_IOCON_PinMux(LPC_IOCON, I2C_DEVICE_PORT, I2C_SCL_PIN, IOCON_MODE_INACT, IOCON_FUNC3);
Chip_IOCON_EnableOD(LPC_IOCON,I2C_DEVICE_PORT, I2C_SDA_PIN);
Chip_I2C_Init(I2C_DEVICE_NUM_MEMR);
Chip_I2C_SetClockRate(I2C_DEVICE_NUM_MEMR,I2C_SPEED_MMR);
Chip_I2C_SetMasterEventHandler(I2C_DEVICE_2,Chip_I2C_EventHandlerPolling);

}

Port 0, SDAPin = 0, SCLPin = 1, I2C_DEVICE_NUM_MEMR = 2, I2C_SPEED_MMR = 256000, I2C_DEVICE_2 = IC2C

Re: Having a lockup in the I2C code

kerryzhou — Thu, 03 Oct 2019 04:01:20 GMT

Hi Alejandro Sobral,

Please create a new question post about your own question, then our LPC engineer will help you.

I don't support the LPC product now, thanks a lot for your understanding.

Best Regards,

kerry