About the use of CAN interrupt in STM32

    "If you are using PA11 and PA12 CAN pins, use CAN1_RX0_IRQn for receive interrupts. If PB8 and PB9 are used as CAN pins, that is, redefined pins, use CAN1_RX1_IRQn for receive interrupts. Since PA11 and PA12 are also USB pins, the library file for non-interconnected microcontrollers with CAN controllers uses USB_LP_CAN1_RX0_IRQn when naming them." For specific definitions, please refer to the stm32F10x.h file, which has specific definitions for interrupts of different models.

 

Here is an example:

1. Configure filters

 CAN_FilterInitStructure.CAN_FilterNumber = 0;

 CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;

   CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;

 CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0000;

 CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;

 CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;
 CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;

 CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_FIFO0;   //关联FIFO0

 CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;

 CAN_FilterInit(&CAN_FilterInitStructure);

  
 CAN_FilterInitStructure.CAN_FilterNumber = 14;

 CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_FIFO1;   //关联FIFO1

 CAN_FilterInit(&CAN_FilterInitStructure);

 

2. Enable CAN interrupt

     

   CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);

   CAN_ITConfig(CAN1, CAN_IT_FMP1, ENABLE);
 

   CAN_ITConfig(CAN2, CAN_IT_FMP0, ENABLE);

   CAN_ITConfig(CAN2, CAN_IT_FMP1, ENABLE);

 

3. Interrupt handling function

void CAN1_RX0_IRQHandler(void)

{
        CAN_Receive(CAN1, CAN_FIFO0, &CAN1_RxMsg);

 //
}

void CAN1_RX1_IRQHandler(void)

{
        CAN_Receive(CAN1, CAN_FIFO1, &CAN1_RxMsg);

        //
}

void CAN2_RX0_IRQHandler(void)

{

        CAN_Receive(CAN2, CAN_FIFO0, &CAN2_RxMsg);
       //
}

void CAN2_RX1_IRQHandler(void)

{
        CAN_Receive(CAN2, CAN_FIFO1, &CAN2_RxMsg);
        //
}