2019-07-20 13:40发布
yuanxinfei 发表于 2016-1-14 11:20 can芯片没问题的情况下,你示波器一端接H一端接L看有波形吗,没波形的话,那么绝对是你can配置有问题
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没有示波器,只有电压表测电压是2.5V,我把f103和f407的配置贴出来
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
#if CAN_RX0_INT_ENABLE
NVIC_InitTypeDef NVIC_InitStructure;
#endif
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//使能PORTA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);//使能CAN1时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化IO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;//上拉输入
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化IO
//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= mode; //模式设置: mode:0,普通模式;1,回环模式; //
//设置波特率
CAN_InitStructure.CAN_SJW=tsjw; //重新同步跳跃宽度(Tsjw)为tsjw+1个时间单位 CAN_SJW_1tq CAN_SJW_2tq CAN_SJW_3tq CAN_SJW_4tq
CAN_InitStructure.CAN_BS1=tbs1; //Tbs1=tbs1+1个时间单位CAN_BS1_1tq ~CAN_BS1_16tq
CAN_InitStructure.CAN_BS2=tbs2;//Tbs2=tbs2+1个时间单位CAN_BS2_1tq ~ CAN_BS2_8tq
CAN_InitStructure.CAN_Prescaler=brp; //分频系数(Fdiv)为brp+1 //
CAN_Init(CAN1, &CAN_InitStructure); // 初始化CAN1
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 CAN_RX0_INT_ENABLE
CAN_ITConfig(CAN1,CAN_IT_FMP0,ENABLE);//FIFO0消息挂号中断允许.
NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; // 主优先级为1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; // 次优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif
return 0;
}
#if CAN_RX0_INT_ENABLE //使能RX0中断
//中断服务函数
void USB_LP_CAN1_RX0_IRQHandler(void)
{
CanRxMsg RxMessage;
int i=0;
CAN_Receive(CAN1, 0, &RxMessage);
for(i=0;i<8;i++)
printf("rxbuf[%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 Can_Send_Msg(u8* msg,u8 len)
{
u8 mbox;
u16 i=0;
CanTxMsg TxMessage;
TxMessage.StdId=0x12; // 标准标识符
TxMessage.ExtId=0x12; // 设置扩展标示符
TxMessage.IDE=CAN_Id_Standard; // 标准帧
TxMessage.RTR=CAN_RTR_Data; // 数据帧
TxMessage.DLC=len; // 要发送的数据长度
for(i=0;i<len;i++)
TxMessage.Data[i]=msg[i];
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
下面 是f4的:
u8 CAN1_Mode_Init(u8 tsjw,u8 tbs2,u8 tbs1,u16 brp,u8 mode)
{
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= mode; //模式设置
CAN_InitStructure.CAN_SJW=tsjw; //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=tbs1; //Tbs1范围CAN_BS1_1tq ~CAN_BS1_16tq
CAN_InitStructure.CAN_BS2=tbs2;//Tbs2范围CAN_BS2_1tq ~ CAN_BS2_8tq
CAN_InitStructure.CAN_Prescaler=brp; //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 = 0; // 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,CAN_FIFO0,&RxMessage);
// for(i=0;i<8;i++)
// printf("rxbuf[%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=0x12; // 设置扩展标示符(29位)
TxMessage.IDE=CAN_ID_STD; // 使用扩展标识符
TxMessage.RTR=0; // 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;
printf("RX==1: ");
if( CAN_MessagePending(CAN1,CAN_FIFO0)==0)
{
printf("RX==2: ");
return 0; //没有接收到数据,直接退出
}
else
{
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;
}
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