[技术问答] HC32F4A0芯片CAN接口硬件问题

    stc_can_init_t stcCanInit;

    stc_can_filter_config_t astcFilter[CAN1_FILTER_NUM] = {

        {CAN1_FILTER1_ID, CAN1_FILTER1_ID_MASK, CAN1_FILTER1_ID_TYPE},

//        {CAN1_FILTER2_ID, CAN1_FILTER2_ID_MASK, CAN1_FILTER2_ID_TYPE},

//        {CAN1_FILTER3_ID, CAN1_FILTER3_ID_MASK, CAN1_FILTER3_ID_TYPE},

    };

    stc_irq_signin_config_t stcIrq;

    

    CAN_DeInit(CM_CAN1);



    /************************* Configure CAN1***************************/

    CLK_SetCANClockSrc(CLK_CAN1, CLK_CANCLK_SYSCLK_DIV6);  // can1 clock = 240/6 MHz = 40MHz

    

    /* GPIO definition */

    GPIO_SetFunc(GPIO_PORT_A,GPIO_PIN_06,GPIO_FUNC_60);//CAN1-TX

    GPIO_SetFunc(GPIO_PORT_A,GPIO_PIN_07,GPIO_FUNC_61);//CAN1-RX



    /* Initializes CAN. */

    (void)CAN_StructInit(&stcCanInit);

    //BaudRate = 40MHz / 20 / (16 + 4)=100K

    //SamplePoint = TS1/(TS1+TS2) = 16/(16+4)= 80%

    //BaudRate = 40MHz / 40 / (16 + 4)=50K

    //SamplePoint = TS1/(TS1+TS2) = 16/(16+4)= 80%

    //TS1 >= (TS2+1)

    //TS2 >= SJW

    stcCanInit.stcBitCfg.u32Prescaler = 20U;        // 100kbps,80%   

    stcCanInit.stcBitCfg.u32TimeSeg1  = 16U;        

    stcCanInit.stcBitCfg.u32TimeSeg2  = 4U;

    stcCanInit.stcBitCfg.u32SJW       = 4U;

    /*!< Only receives correct frames. */

    stcCanInit.u8RxAllFrame           = CAN_RX_ALL_FRAME_DISABLE;

    /*!< Saves the newly received data and the oldest frame will be overwritten. */

    stcCanInit.u8RxOvfMode            = CAN_RX_OVF_SAVE_NEW;

    stcCanInit.pstcFilter             = astcFilter;

    stcCanInit.u16FilterSelect        = CAN1_FILTER_SEL;

    stcCanInit.u8WorkMode             = CAN_WORK_MD_ELB;

    if(stcCanInit.u8WorkMode == CAN_WORK_MD_NORMAL){

        stcCanInit.u8SelfAck              = CAN_SELF_ACK_DISABLE;

    }else if(stcCanInit.u8WorkMode == CAN_WORK_MD_ELB){

        stcCanInit.u8SelfAck              = CAN_SELF_ACK_ENABLE;

    }



    /* Enable peripheral clock of CAN1. */

    FCG_Fcg1PeriphClockCmd(FCG1_PERIPH_CAN1, ENABLE);

    (void)CAN_Init(CM_CAN1, &stcCanInit);

    /* Enable the interrupts, the status flags can be read. */

//    CAN_IntCmd(CM_CAN1, CAN_INT_ALL, DISABLE);

//    CAN_IntCmd(CM_CAN1, CAN_INT_RX | CAN_INT_ERR_INT, ENABLE);      

    CAN_IntCmd(CM_CAN1, CAN_INT_ALL, ENABLE);



    stcIrq.enIntSrc    = CAN1_INT_SRC;

    stcIrq.enIRQn      = CAN1_INT_IRQn;

    stcIrq.pfnCallback = &CAN1_IrqCallback;

    INTC_IrqInstalHandler(&stcIrq, DDL_IRQ_PRIO_DEFAULT);