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Unable to receive CAN data

Question asked by ebommer on Sep 8, 2014
Latest reply on Jan 26, 2015 by ABCD

I am working on the STM32F302 Micro and I currently unable to receive data on the CAN bus, I have a break point set on the interrupt routine.  I am able to transmit data.  I am seeing the micro sends an acknowledge bit when I send data from my CAN tool, so I know the message is getting there, but when I look at the receive buffer I see nothing.  I figure since my CAN tool receives the data from the micro without error I have all the timing set appropriately.

 

I am set for interrupt on Tx and Rx:

 

    /*  Transmit */

 

    HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_0);

 

    HAL_NVIC_SetPriority(USB_HP_CAN_TX_IRQn, 0, 0);

 

    HAL_NVIC_EnableIRQ(USB_HP_CAN_TX_IRQn);

 

    /*  Receive */

 

    HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_0);

 

    HAL_NVIC_SetPriority(USB_LP_CAN_RX0_IRQn, 0, 0);

 

    HAL_NVIC_EnableIRQ(USB_LP_CAN_RX0_IRQn);

 

Interrupt routine:

 

void USB_LP_CAN_RX0_IRQHandler(void)

 

{

 

  HAL_NVIC_ClearPendingIRQ(USB_LP_CAN_RX0_IRQn);

 

  HAL_CAN_IRQHandler(&hcan);

 

}

 

I have F0R1 and F0R2 set to 0x04, I am using an extended ID.

 

I have CAN transmitting and receiving on a STM32F103 and I have compared my setup and see no difference.  So I am running out of guesses.


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