CAN LOOPBACK测试通过。NORMAL接收不到

53299621 · 发表于 2015-5-8 18:50:03

硬件连接。我直接用杜邦线连接在一起的。。H和H连接。L和L连接。。。。用loopback模式自己可以接受到自己的。但另一边接收不到。。。弄成normal。接收中断函数都进不去。。测试接收端波形也没有波形。。。就算发送端的波形也没有

程序如下所示：

void CAN_Configuration(void)
{
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;

/* CAN register init */
CAN_DeInit(CAN1);
CAN_StructInit(&CAN_InitStructure);

/* CAN cell init */
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 = ENABLE;
// CAN_InitStructure.CAN_Mode = CAN_Mode_LoopBack;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_4tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_3tq;
CAN_InitStructure.CAN_Prescaler = 45;

CAN_Init(CAN1,&CAN_InitStructure);

CAN_FilterInitStructure.CAN_FilterNumber=0;
CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;
CAN_FilterInitStructure.CAN_FilterIdHigh=(((u32)0x0a0<<21)&0xffff0000)>>16;
CAN_FilterInitStructure.CAN_FilterIdLow=(((u32)0x0a0<<21)|CAN_ID_STD|CAN_RTR_DATA)&0xffff;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0xffff;
CAN_FilterInitStructure.CAN_FilterMaskIdLow=0xffff;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment=0;
CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;

CAN_ITConfig(CAN1,CAN_IT_FMP0, ENABLE); //接收中断使能

CAN_FilterInit(&CAN_FilterInitStructure);
}

IO口：
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;                  //PA11:CAN-RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;        //输入上拉
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;      //PA12:CAN-TX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    //复用模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

中断：

NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;