TMS470MF06607: CAN error Notification

SHANKARNARAYAN PS

Part Number: TMS470MF06607
Other Parts Discussed in Thread: HALCOGEN

Hello,

I am currently developing a CAN sniffer in which an error on CAN is identified using CAN error notification. I tried to test this by not connecting anything on CAN and try to shoot Transmission.

For the first time, all is well I see that as soon as I try to transmit the very first message, an interrupt on CAN occurs and since there is error indication, it will jump to notification,

Now the problem is, second time I try to send the CAN, nothing happens and no notification. Am I supposed to clear some flag or something?

What I need is that I should hit error notification every time I try to transmit a CAN on an unconnected node. How do I achieve this?

Regards,

Shankar

over 7 years ago

0 Bob Crosby over 7 years ago

TI__Guru 72500 points

You do have to clear the pending interrupt flag in the CAN module. Have you looked at the interrupt code generated by HALCoGen?

/** @fn void can1HighLevelInterrupt(void)
*   @brief DCAN1 High Level Interrupt Handler
*/

/* USER CODE BEGIN (40) */
/* USER CODE END */

#pragma INTERRUPT(can1HighLevelInterrupt)
void can1HighLevelInterrupt(void)
{
    uint32 value = canREG1->INT;

/* USER CODE BEGIN (41) */
/* USER CODE END */

    if (value == 0x8000U)
    {
        canErrorNotification(canREG1, canREG1->ES & 0x1E0U);
        return;
    }

    /** - Setup IF1 for clear pending interrupt flag */
    while ((canREG1->IF1STAT & 0x80U) ==0x80U)
    { 
	} /* Wait */

    canREG1->IF1CMD = 0x08;
    canREG1->IF1NO  = value;

    while ((canREG1->IF1STAT & 0x80U) ==0x80U)
    { 
	} /* Wait */

    canREG1->IF1CMD = 0x87;

    canMessageNotification(canREG1, value);

/* USER CODE BEGIN (42) */
/* USER CODE END */
}

0 SHANKARNARAYAN PS over 7 years ago in reply to Bob Crosby

Intellectual 625 points

Thanks Bob. I see I have been a bit stupid!

#update

I guess I was too quick for a conclusion. Even After I changed the code as shown below, the interrupts never occur. Anything else missing?

void can2HighLevelInterrupt(void)
{
    uint32 value = canREG2->INT;

/* USER CODE BEGIN (47) */
/* USER CODE END */

    if (value == 0x8000U)
    {
        while ((canREG2->IF1STAT & 0x80U) ==0x80U)
        { 
	} /* Wait */

        canREG2->IF1CMD = 0x08;
        canREG2->IF1NO  = value;
        canErrorNotification(canREG2, canREG2->ES & 0x1E0U);
        return;
    }

0 Bob Crosby over 7 years ago in reply to SHANKARNARAYAN PS

TI__Guru 72500 points

OK, not sure what the issue is so let's look at your HALCoGen configuration and I have attached a simple example that works. The example transmits on CAN1 and receives on CAN2.

Did you enable interrupts for CAN2?

Did you enable VIM channel 29?

Here is my sample project:

/cfs-file/__key/communityserver-discussions-components-files/312/8407.InterruptCanCommunication.zip

0 SHANKARNARAYAN PS over 7 years ago in reply to Bob Crosby

Intellectual 625 points

Hello Bob,

Thanks for the response. Yes the interrupts are enabled. Infcat, am getting the message interrupts and notification like a charm. No issues when I have a healthy CAN node. The problem only is in the error notification.

Regards,

Shankar

0 Bob Crosby over 7 years ago in reply to SHANKARNARAYAN PS

TI__Guru 72500 points

Did the DCAN go into Bus-Off state? Did you configure the device to use the Auto-Bus-On feature?

0 SHANKARNARAYAN PS over 7 years ago in reply to Bob Crosby

Intellectual 625 points

Hello Bob,

Yes I did configure the bus for an auto recovery. And also since I left the CAN channel open (open Ckt) I am pretty sure it would have reached a BUss-off State. Wont it notify an error when it tries to transmit in Buss-off state?

Regards,

Shankar

Arm-based microcontrollers

Arm-based microcontrollers forum

TMS470MF06607: CAN error Notification