STM32 CAN第一次上电无法发送，但是插拔一下电源就可以了，是什么原因呢？

MasterWang

我用两个设备A和B，A用CAN1发送给B，B处理后用CAN2返回给A，现在第一次上电时A都无法发送，打印TxMailBox是4，CAN_TransmitStatus是CAN_TxStatus_Pending。但是拔插电源后又可以发送了，但还是CAN_TxStatus_Pending，有大神能说一下什么原因吗
        NVIC_InitTypeDef  NVIC_InitStructure;
        NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX0_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);

        CAN_InitStructure.CAN_TTCM = DISABLE;
        CAN_InitStructure.CAN_ABOM = ENABLE;
        CAN_InitStructure.CAN_AWUM = DISABLE;
        CAN_InitStructure.CAN_NART = DISABLE;
        CAN_InitStructure.CAN_RFLM = DISABLE;
        CAN_InitStructure.CAN_TXFP = ENABLE;        // 把TXFP设为ENABLE，各帧按先到先发送的顺序发送
        CAN_InitStructure.CAN_Mode = mode;
        CAN_InitStructure.CAN_SJW = baudRate[br_index].CAN_SJW;
        CAN_InitStructure.CAN_BS1 = baudRate[br_index].CAN_BS1;
        CAN_InitStructure.CAN_BS2 = baudRate[br_index].CAN_BS2;
        CAN_InitStructure.CAN_Prescaler = baudRate[br_index].CAN_Prescaler;


        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 = 0;
        CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
        CAN_FilterInit(&CAN_FilterInitStructure);