一下是can配置的源码
u8 CAN1_Mode_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
#if CAN1_RX0_INT_ENABLE
NVIC_InitTypeDef NVIC_InitStructure;
#endif
//使能相关时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//使能PORTA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);//使能CAN1时钟
//初始化GPIO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11| GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化PA11,PA12
//引脚复用映射配置
GPIO_PinAFConfig(GPIOA,GPIO_PinSource11,GPIO_AF_CAN1); //GPIOA11复用为CAN1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource12,GPIO_AF_CAN1); //GPIOA12复用为CAN1
//CAN单元设置
CAN_InitStructure.CAN_TTCM=DISABLE; //非时间触发通信模式
CAN_InitStructure.CAN_ABOM=DISABLE; //软件自动离线管理
CAN_InitStructure.CAN_AWUM=DISABLE;//睡眠模式通过软件唤醒(清除CAN->MCR的SLEEP位)
CAN_InitStructure.CAN_NART=ENABLE; //禁止报文自动传送
CAN_InitStructure.CAN_RFLM=DISABLE; //报文不锁定,新的覆盖旧的
CAN_InitStructure.CAN_TXFP=DISABLE; //优先级由报文标识符决定
CAN_InitStructure.CAN_Mode= CAN_Mode_Normal; //模式设置
CAN_InitStructure.CAN_SJW=CAN_SJW_2tq; //重新同步跳跃宽度(Tsjw)为tsjw+1个时间单位 CAN_SJW_1tq~CAN_SJW_4tq
CAN_InitStructure.CAN_BS1=CAN_BS1_5tq; //Tbs1范围CAN_BS1_1tq ~CAN_BS1_16tq
CAN_InitStructure.CAN_BS2=CAN_BS2_3tq;//Tbs2范围CAN_BS2_1tq ~ CAN_BS2_8tq
CAN_InitStructure.CAN_Prescaler=20; //分频系数(Fdiv)为brp+1
CAN_Init(CAN1, &CAN_InitStructure); // 初始化CAN1
//配置过滤器
CAN_FilterInitStructure.CAN_FilterNumber=0; //过滤器0
CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit; //32位
CAN_FilterInitStructure.CAN_FilterIdHigh=0x0000;////32位ID
CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x0000;//32位MASK
CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment=CAN_Filter_FIFO0;//过滤器0关联到FIFO0
CAN_FilterInitStructure.CAN_FilterActivation=ENABLE; //激活过滤器0
CAN_FilterInit(&CAN_FilterInitStructure);//滤波器初始化
#if CAN1_RX0_INT_ENABLE
CAN_ITConfig(CAN1,CAN_IT_FMP0,ENABLE);//FIFO0消息挂号中断允许.
NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; // 主优先级为1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; // 次优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif
return 0;
}
#if CAN1_RX0_INT_ENABLE //使能RX0中断
//中断服务函数
void CAN1_RX0_IRQHandler(void)
{
CanRxMsg RxMessage;
int i=0;
CAN_Receive(CAN1, 0, &RxMessage);
for(i=0;i<8;i++)
printf("rxbuf1[%d]:%d
",i,RxMessage.Data[i]);
}
#endif
//can发送一组数据(固定格式:ID为0X12,标准帧,数据帧)
//len:数据长度(最大为8)
//msg:数据指针,最大为8个字节.
//返回值:0,成功;
// 其他,失败;
u8 CAN1_Send_Msg(u8* msg,u8 len)
{
u8 mbox;
u16 i=0;
CanTxMsg TxMessage;
// TxMessage.StdId=0x12; // 标准标识符为0
TxMessage.ExtId=0x1314; // 设置扩展标示符（29位）
TxMessage.IDE=CAN_ID_EXT; // 使用扩展标识符
TxMessage.RTR=CAN_RTR_DATA; // 消息类型为数据帧，一帧8位
TxMessage.DLC=len; // 发送两帧信息
for(i=0;i<len;i++)
TxMessage.Data[i]=msg[i]; // 第一帧信息
mbox= CAN_Transmit(CAN1, &TxMessage);
i=0;
while((CAN_TransmitStatus(CAN1, mbox)==CAN_TxStatus_Failed)&&(i<0XFFF))i++; //等待发送结束
if(i>=0XFFF)return 1;
return 0;
}
//can口接收数据查询
//buf:数据缓存区;
//返回值:0,无数据被收到;
// 其他,接收的数据长度;
u8 CAN1_Receive_Msg(u8 *buf)
{
u32 i;
CanRxMsg RxMessage;
if( CAN_MessagePending(CAN1,CAN_FIFO0)==0)return 0; //没有接收到数据,直接退出
CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);//读取数据
for(i=0;i<RxMessage.DLC;i++)
buf[i]=RxMessage.Data[i];
return RxMessage.DLC;
}
///can2 初始化配置
u8 CAN2_Mode_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//使能相关时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//使能PORTA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN2, ENABLE);//使能CAN1时钟
// RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOB, ENABLE);
//初始化GPIO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12| GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化PA11,PA12
//引脚复用映射配置
GPIO_PinAFConfig(GPIOB,GPIO_PinSource12,GPIO_AF_CAN2); //GPIOA11复用为CAN1
GPIO_PinAFConfig(GPIOB,GPIO_PinSource13,GPIO_AF_CAN2); //GPIOA12复用为CAN1
//CAN单元设置
CAN_InitStructure.CAN_TTCM=DISABLE; //非时间触发通信模式
CAN_InitStructure.CAN_ABOM=DISABLE; //软件自动离线管理
CAN_InitStructure.CAN_AWUM=DISABLE;//睡眠模式通过软件唤醒(清除CAN->MCR的SLEEP位)
CAN_InitStructure.CAN_NART=ENABLE; //禁止报文自动传送
CAN_InitStructure.CAN_RFLM=DISABLE; //报文不锁定,新的覆盖旧的
CAN_InitStructure.CAN_TXFP=DISABLE; //优先级由报文标识符决定
CAN_InitStructure.CAN_Mode= CAN_Mode_Normal; //模式设置
CAN_InitStructure.CAN_SJW=CAN_SJW_2tq; //重新同步跳跃宽度(Tsjw)为tsjw+1个时间单位 CAN_SJW_1tq~CAN_SJW_4tq
CAN_InitStructure.CAN_BS1=CAN_BS1_5tq; //Tbs1范围CAN_BS1_1tq ~CAN_BS1_16tq
CAN_InitStructure.CAN_BS2=CAN_BS2_3tq;//Tbs2范围CAN_BS2_1tq ~ CAN_BS2_8tq
CAN_InitStructure.CAN_Prescaler=20; //分频系数(Fdiv)为brp+1
CAN_Init(CAN2, &CAN_InitStructure); // 初始化CAN2
//配置过滤器
CAN_FilterInitStructure.CAN_FilterNumber=14; //过滤器14
CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit; //32位
CAN_FilterInitStructure.CAN_FilterIdHigh=0x0000;////32位ID
CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x0000;//32位MASK
CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment=CAN_Filter_FIFO0;//过滤器0关联到FIFO0
CAN_FilterInitStructure.CAN_FilterActivation=ENABLE; //激活过滤器0
CAN_FilterInit(&CAN_FilterInitStructure);//滤波器初始化
CAN_ITConfig(CAN2,CAN_IT_FMP0,ENABLE);//FIFO0消息挂号中断允许.
NVIC_InitStructure.NVIC_IRQChannel = CAN2_RX0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; // 主优先级为1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; // 次优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
return 0;
}
//中断服务函数
void CAN2_RX0_IRQHandler(void)
{
CanRxMsg Rx2Message;
int i=0;
CAN_Receive(CAN2, 0, &Rx2Message);
for(i=0;i<8;i++)
printf("rxbuf2[%d]:%d
",i,Rx2Message.Data[i]);
}
//can发送一组数据(固定格式:ID为0X12,标准帧,数据帧)
//len:数据长度(最大为8)
//msg:数据指针,最大为8个字节.
//返回值:0,成功;
// 其他,失败;
u8 CAN2_Send_Msg(u8* msg,u8 len)
{
u8 mbox;
u16 i=0;
CanTxMsg Tx2Message;
// TxMessage.StdId=0x12; // 标准标识符为0
Tx2Message.ExtId=0x1314; // 设置扩展标示符（29位）
Tx2Message.IDE=CAN_ID_EXT; // 使用扩展标识符
Tx2Message.RTR=CAN_RTR_DATA; // 消息类型为数据帧，一帧8位
Tx2Message.DLC=len; // 发送两帧信息
for(i=0;i<len;i++)
Tx2Message.Data[i]=msg[i]; // 第一帧信息
mbox= CAN_Transmit(CAN2, &Tx2Message);
i=0;
while((CAN_TransmitStatus(CAN2, mbox)==CAN_TxStatus_Failed)&&(i<0XFFF))i++; //等待发送结束
if(i>=0XFFF)return 1;
return 0;
}
//can口接收数据查询
//buf:数据缓存区;
//返回值:0,无数据被收到;
// 其他,接收的数据长度;
u8 CAN2_Receive_Msg(u8 *buf)
{
u32 i;
CanRxMsg Rx2Message;
if( CAN_MessagePending(CAN2,CAN_FIFO0)==0)return 0; //没有接收到数据,直接退出
CAN_Receive(CAN2, CAN_FIFO0, &Rx2Message);//读取数据
for(i=0;i<Rx2Message.DLC;i++)
buf[i]=Rx2Message.Data[i];
return Rx2Message.DLC;
}
目前已经全部调试通过
但是 这里很奇怪uint8_t CAN_FilterNumber; /*!< Specifies the filter which will be initialized. It ranges from 0 to 13. */ 这个是库里面写的，请问这里我必须设置为14才可以，can2才可以工作，请问原子哥这是怎么什么原因？我买的是原子哥的开发板 请教原子哥
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