自发自收，设置发送速率为36M/((1+3+4)*1)=36/8,那接收速率是多少？如果把发送速率降低，接收到数据时，发送数据没有发送完，
CAN_InitStructure.CAN_TTCM = DISABLE;
 CAN_InitStructure.CAN_ABOM = DISABLE;
 CAN_InitStructure.CAN_AWUM = DISABLE;
 CAN_InitStructure.CAN_NART = DISABLE;
 CAN_InitStructure.CAN_RFLM = DISABLE;
 CAN_InitStructure.CAN_TXFP = DISABLE;
 CAN_InitStructure.CAN_Mode = CAN_Mode_LoopBack;
 CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
 CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
 CAN_InitStructure.CAN_BS2 = CAN_BS2_4tq;
 CAN_InitStructure.CAN_Prescaler =1;      //不能为零
 CAN_Init(CAN1,&CAN_InitStructure); 

接受和发送的速率是一样的。你这样设置的是CAN模块的速率。

接受硬件缓冲的，你这中情况不会出现的。只有完整的接受到一帧数据，CAN才会通知你已经收到数据。