CAN transmit Interrupt Not Working

[Alok Nigam]

Posted on July 21, 2017 at 08:40

Hi

I am working on SPC560B50x controller and trying to send CAN messages from the controller to the busmaster tool.I am unable to hit CAN transmit ISR breakpoint, but messages transmitted through my controller is getting reflected in the busmaster tool. CAN configuration is as follows-: 1) Using CAN channel 0.2) Baudrate 500 kbps.3) No FIFO being used.4) Lowest Buffer transmitted first5) Max Message Buffers used are 32 for all IMASK1 is enabled ( value given = 0xFFFFFFFF).6) Bus Off, Error, Tx Warning, Rx Warning all are enabled.7) All being done in the freeze mode. In CAN_Transmit function I am setting appropriate code for transmission.I am using 32 message buff to transmit 32 different data, same message ID over CAN bus and clearing all IFLAG1 after transmission. Code snippet is attached. Please help so that I may be able to hit the CAN transmit ISR breakpoint and I may proceed further.

[Erwan YVIN]

Posted on August 09, 2017 at 14:15

Hello Alok ,

Sorry for the late answer ,

Did you try set the corresponding INTC PSR (Priority Select Register) ?

(cf below) SPC5RLA Can Driver from SPC5Studio Suite Development

/**
 * @brief Low level CAN driver initialization.
 *
 * @notapi
 */
void can_lld_init(void) {
#if (SPC5_CAN_USE_FLEXCAN0 == TRUE)
 /* Driver initialization.*/
 CAND1.config = NULL;
 CAND1.flexcan = &SPC5_FLEXCAN_0;
#if (SPC5_FLEXCAN0_SHARED_IRQ == FALSE)
 INTC_PSR(SPC5_FLEXCAN0_ESR_ERR_INT_NUMBER) =
 SPC5_CAN_FLEXCAN0_IRQ_PRIORITY;
 INTC_PSR(SPC5_FLEXCAN0_ESR_BOFF_NUMBER) =
 SPC5_CAN_FLEXCAN0_IRQ_PRIORITY;
 INTC_PSR(SPC5_FLEXCAN0_BUF_00_NUMBER) =
 SPC5_CAN_FLEXCAN0_IRQ_PRIORITY;
 INTC_PSR(SPC5_FLEXCAN0_BUF_01_NUMBER) =
 SPC5_CAN_FLEXCAN0_IRQ_PRIORITY;
 INTC_PSR(SPC5_FLEXCAN0_BUF_02_NUMBER) =
 SPC5_CAN_FLEXCAN0_IRQ_PRIORITY;
 INTC_PSR(SPC5_FLEXCAN0_BUF_03_NUMBER) =
 SPC5_CAN_FLEXCAN0_IRQ_PRIORITY;�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?

Best regards

Erwan