大大们好，最近在撸关于CAN总线那些事，现在对于CAN的接受数据有一些不懂，如果我只接收数据，例如来自汽车的CAN数据，根据接收的数据，来做一些功能的话，那么我的接收函数应该配置勒，下面是一些自己写的代码配置，接收一位数据并将其保存在一个缓冲区，有什么问题，请多多指！
void CAN_RCC_Config(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1,ENABLE);
}
void CAN_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//GPIO_PinRemapConfig(GPIO_Remap1_CAN1,ENABLE);
}
void CAN_NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel=USB_LP_CAN1_RX0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void CAN_Config(void)
{
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
CAN_DeInit(CAN1);
CAN_StructInit(&CAN_InitStructure);
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_Normal;
/* CAN Baudrate */
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
#if 1 // 125K
CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
CAN_InitStructure.CAN_Prescaler = 32;
#endif
#if 0 // 250K
CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
CAN_InitStructure.CAN_Prescaler = 16;
#endif
#if 0 // 500K
CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
CAN_InitStructure.CAN_Prescaler = 8;
#endif
#if 0 // 1MBps
CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
CAN_InitStructure.CAN_Prescaler = 4;
#endif
CAN_Init(CAN1,&CAN_InitStructure);
CAN_FilterInitStructure.CAN_FilterNumber=1;
CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;
CAN_FilterInitStructure.CAN_FilterIdHigh=0 ;
CAN_FilterInitStructure.CAN_FilterIdLow=0 ;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0 ;
CAN_FilterInitStructure.CAN_FilterMaskIdLow=0 ;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment= 0 ;
CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
/* CAN FIFO0 message pending interrupt enable */
CAN_ITConfig(CAN1,CAN_IT_FMP0, ENABLE);
}
void USB_LP_CAN1_RX0_IRQHandler(void)
{
CanRxMsg RxMessage;
CAN_Receive(CAN1,CAN_FIFO0,&RxMessage);
RxMessage.StdId = 0 ; //选择标准ID
RxMessage.ExtId = 0 ; //选择扩展ID
RxMessage.IDE = CAN_ID_STD; //选择接收标准帧
RxMessage.DLC = 1 ; //将接收数据长度
RxMessage.RTR = CAN_RTR_DATA ; //选择接收数据帧
CAN_Receive(CAN1,CAN_FIFO0, &RxMessage); //接收FIFO0数据
if(Rx_flag == 0)
{
if(RxMessage.DLC == 1)
{
CAN_RX_BUF[0] = RxMessage.Data[0]; //将接收的数据保存进缓冲区
}
}
}
u8 CAN_GetMsg(u8 *msg)
{
if(Rx_flag == 1)
{
*msg = CAN_RX_BUF[0] ;
Rx_flag = 0;
return 1;
}
else
return 0;
}
void Clear_CanBuffer(void)
{
Rx_flag = 0; //清楚接收标志位
memset(CAN_RX_BUF, 0 ,sizeof(u8)*CAN_RX_LEN); //清空缓冲区
}
u8 Check_CanRx(void)
{
return (Rx_flag == 6);
}
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