topic lpc54616 can bus error managment in LPC Microcontrollers

lpc54616 can bus error managment

ali3 — Mon, 08 Jun 2020 21:37:05 GMT

How can dedect bus off state an other can bus error im lpc 54616? im try in mcan interrupt transfer like this:

case kStatus_MCAN_ErrorStatus:
{
uint32_t bo, lec;

if ((base->PSR&CAN_PSR_BO_MASK)>>CAN_PSR_BO_SHIFT)
{

/* Reset INIT bit to enter normal mode. */
base->CCCR &= ~CAN_CCCR_INIT_MASK;
while (0U != (base->CCCR & CAN_CCCR_INIT_MASK))
{
}

while ( (((base->PSR&CAN_PSR_LEC_MASK)==5) ) || (((base->PSR&CAN_PSR_BO_MASK)>>CAN_PSR_BO_SHIFT==1)) )
{

}

MCAN_Init(EXAMPLE_MCAN, &mcanConfig, MCAN_CLK_FREQ);
//MCAN_Deinit(base);
}

//MCAN_Init(EXAMPLE_MCAN, &mcanConfig, MCAN_CLK_FREQ);
//MCAN_Deinit(base);//Init(EXAMPLE_MCAN, &mcanConfig, MCAN_CLK_FREQ);

}

But PSR_BO always is 1

Re: lpc54616 can bus error managment

frank_m — Tue, 09 Jun 2020 05:43:53 GMT

Check the error counter values (TEC and REC).

These values are implemented according to the CAN bus standard.

"Bus off" means a counter (usually TEC) has hit 255.

It seems you have a physical problem, perhaps your termination is not correct, or you swapped CANH and CANL at one bus participant.

Re: lpc54616 can bus error managment

xiangjun_rong — Tue, 09 Jun 2020 06:26:44 GMT

Hi, Ali,

For the CAN bus off error, pls check the CAN bus network, the CANx_TD and CANx_RD must be connected to a CAN transceiver, as Frank said that the 120 ohm terminating resistor between CAN_H and CAN_L pins of CAN transceiver is required.

XiangJun Rong

Re: lpc54616 can bus error managment

ali3 — Tue, 09 Jun 2020 11:34:31 GMT

My can cominication work.İ neede manupilating can buss error state. I can try in sdk example . Can work normal but if i can short circuit can bus can goes bus off state . How can i reset cominication and other error state.

Re: lpc54616 can bus error managment

xiangjun_rong — Wed, 10 Jun 2020 02:41:39 GMT

Hi, Ali,

I see that you just want to handle various error.

You can manipulate the NCAN0_RST in PRESETCTRL1 REG to reset the CAN module, then reinitialize the CAN module.

Hope it can help you

XiangJun Rong

Re: lpc54616 can bus error managment

ali3 — Wed, 10 Jun 2020 12:42:11 GMT

i can solve this problem . I can grab error in calback function. after ican restart can modul with bus_off. But important function sendnonblocking method. if user use like sdk is hangup in while statement

while (!txComplete)
{

}
txComplete = false;

user must control sendnonblocikng methode return value. If valu is sucsec u can use while statement.

sts=MCAN_TransferSendNonBlocking(EXAMPLE_MCAN, &mcanHandle, &txXfer);

switch (sts)
{

case kStatus_Success:
{
while (!txComplete)
{

}
txComplete = false;

}
break;

case kStatus_Fail:
{
psr=EXAMPLE_MCAN->PSR&CAN_PSR_LEC_MASK;
ecer=EXAMPLE_MCAN->ECR&CAN_ECR_TEC_MASK;
busof=(EXAMPLE_MCAN->PSR&CAN_PSR_BO_MASK)>>CAN_PSR_BO_SHIFT;
ccr=EXAMPLE_MCAN->CCCR;
sts=0;

}

break;
case kStatus_MCAN_TxBusy:
{

}

default:
break;

}

call back func:

static void mcan_callback(CAN_Type *base, mcan_handle_t *handle, status_t status, uint32_t result, void *userData)
{
BaseType_t xHigherPriorityTaskWoken;

/* The xHigherPriorityTaskWoken parameter must be initialized to pdFALSE as
it will get set to pdTRUE inside the interrupt safe API function if a
context switch is required. */
xHigherPriorityTaskWoken = pdFALSE;

/* 'Give' the semaphore to unblock the task. */

/* Pass the xHigherPriorityTaskWoken value into portYIELD_FROM_ISR(). If
xHigherPriorityTaskWoken was set to pdTRUE inside xSemaphoreGiveFromISR()
then calling portYIELD_FROM_ISR() will request a context switch. If
xHigherPriorityTaskWoken is still pdFALSE then calling
portYIELD_FROM_ISR() will have no effect. The implementation of
portYIELD_FROM_ISR() used by the Windows port includes a return statement,
which is why this function does not explicitly return a value. */

// printf("Callback status: 0x%x", status);
//printf(" IR: 0x%x \r\n", base->IR);

switch (status)
{

case kStatus_MCAN_RxFifo0Idle:
{

xSemaphoreGiveFromISR( semaphoreRX, &xHigherPriorityTaskWoken );
rxComplete = true;
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}
break;

case kStatus_MCAN_TxIdle:
{
xSemaphoreGiveFromISR( semaphorum, &xHigherPriorityTaskWoken );
txComplete = true;
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}
break;

case kStatus_MCAN_ErrorStatus:
{
if (EXAMPLE_MCAN->CCCR &= CAN_CCCR_INIT_MASK)
{
EXAMPLE_MCAN->CCCR &= ~CAN_CCCR_INIT_MASK;
while (0U != (EXAMPLE_MCAN->CCCR & CAN_CCCR_INIT_MASK))
{
}
}

mcanreset();
//txError=true;
txComplete = true;
xSemaphoreGiveFromISR( semaphorum, &xHigherPriorityTaskWoken );
txComplete = true;
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );

}

default:
break;
}
}

in calback function i send xsemaphore to my rtos but this is only evaluate .

sory this code only evaluate. im writing all is next day.