代码如下:
#include “mycan.h”
//CAN初始化
//tsjw:重新同步跳跃时间单元。范围:1~3; CAN_SJW_1tq CAN_SJW_2tq CAN_SJW_3tq CAN_SJW_4tq
//tbs2:时间段2的时间单元。范围:1~8;
//tbs1:时间段1的时间单元。范围:1~16; CAN_BS1_1tq ~CAN_BS1_16tq
//brp :波特率分频器。范围:1~1024;(实际要加1,也就是1~1024) tq=(brp)*tpclk1
//注意以上参数任何一个都不能设为0,否则会乱。
//波特率=Fpclk1/((tsjw+tbs1+tbs2)*brp);
//mode:0,普通模式;1,回环模式;
//Fpclk1的时钟在初始化的时候设置为36M,如果设置CAN_Normal_Init(1,8,7,5,1);
//则波特率为:48M/((1+8+7)*5)=450Kbps
void CAN_Mode_Init(uint8_t tsjw,uint8_t tbs2,uint8_t tbs1,uint16_t brp,uint8_t mode)
{
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_SYSCFG, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);//使能PORTA时钟
SYSCFG-》CFGR1 |= SYSCFG_CFGR1_PA11_PA12_RMP; //RMAP
GPIO_PinAFConfig(GPIOA,GPIO_PinSource12,GPIO_AF_4);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource11,GPIO_AF_4);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);//使能CAN时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11|GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
CAN_DeInit(CAN);
//CAN单元设置
CAN_InitStructure.CAN_TTCM=DISABLE; //非时间触发通信模式 //
CAN_InitStructure.CAN_ABOM=ENABLE; //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(CAN, &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
}
#if CAN_RX0_INT_ENABLE //使能RX0中断
//中断服务函数
void CEC_CAN_IRQHandler(void)
{
CanRxMsg RxMessage;
int i=0;
CAN_Receive(CAN, 0, &RxMessage);
//for(i=0;i《8;i++)
//printf(“rxbuf[%d]:%drn”,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;
uint8_t Can_Send_Msg(uint8_t* msg,uint8_t len)
{
uint8_t mbox;
uint16_t 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=0; // 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(CAN, &TxMessage);
i=0;
while((CAN_TransmitStatus(CAN, 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;
uint8_t Can_Receive_Msg(uint8_t *buf)
{
uint32_t i;
CanRxMsg RxMessage;
if( CAN_MessagePending(CAN,CAN_FIFO0)==0)return 0; //没有接收到数据,直接退出
CAN_Receive(CAN, CAN_FIFO0, &RxMessage);//读取数据
for(i=0;i《8;i++)
buf[i]=RxMessage.Data[i];
return RxMessage.DLC;
}
注意:一定要根据自己的封装来设置
SYSCFG-》CFGR1 |= SYSCFG_CFGR1_PA11_PA12_RMP;
如果不设置 CAN_Init(CAN, &CAN_InitStructure);会初始化失败
代码如下:
#include “mycan.h”
//CAN初始化
//tsjw:重新同步跳跃时间单元。范围:1~3; CAN_SJW_1tq CAN_SJW_2tq CAN_SJW_3tq CAN_SJW_4tq
//tbs2:时间段2的时间单元。范围:1~8;
//tbs1:时间段1的时间单元。范围:1~16; CAN_BS1_1tq ~CAN_BS1_16tq
//brp :波特率分频器。范围:1~1024;(实际要加1,也就是1~1024) tq=(brp)*tpclk1
//注意以上参数任何一个都不能设为0,否则会乱。
//波特率=Fpclk1/((tsjw+tbs1+tbs2)*brp);
//mode:0,普通模式;1,回环模式;
//Fpclk1的时钟在初始化的时候设置为36M,如果设置CAN_Normal_Init(1,8,7,5,1);
//则波特率为:48M/((1+8+7)*5)=450Kbps
void CAN_Mode_Init(uint8_t tsjw,uint8_t tbs2,uint8_t tbs1,uint16_t brp,uint8_t mode)
{
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_SYSCFG, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);//使能PORTA时钟
SYSCFG-》CFGR1 |= SYSCFG_CFGR1_PA11_PA12_RMP; //RMAP
GPIO_PinAFConfig(GPIOA,GPIO_PinSource12,GPIO_AF_4);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource11,GPIO_AF_4);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);//使能CAN时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11|GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
CAN_DeInit(CAN);
//CAN单元设置
CAN_InitStructure.CAN_TTCM=DISABLE; //非时间触发通信模式 //
CAN_InitStructure.CAN_ABOM=ENABLE; //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(CAN, &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
}
#if CAN_RX0_INT_ENABLE //使能RX0中断
//中断服务函数
void CEC_CAN_IRQHandler(void)
{
CanRxMsg RxMessage;
int i=0;
CAN_Receive(CAN, 0, &RxMessage);
//for(i=0;i《8;i++)
//printf(“rxbuf[%d]:%drn”,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;
uint8_t Can_Send_Msg(uint8_t* msg,uint8_t len)
{
uint8_t mbox;
uint16_t 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=0; // 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(CAN, &TxMessage);
i=0;
while((CAN_TransmitStatus(CAN, 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;
uint8_t Can_Receive_Msg(uint8_t *buf)
{
uint32_t i;
CanRxMsg RxMessage;
if( CAN_MessagePending(CAN,CAN_FIFO0)==0)return 0; //没有接收到数据,直接退出
CAN_Receive(CAN, CAN_FIFO0, &RxMessage);//读取数据
for(i=0;i《8;i++)
buf[i]=RxMessage.Data[i];
return RxMessage.DLC;
}
注意:一定要根据自己的封装来设置
SYSCFG-》CFGR1 |= SYSCFG_CFGR1_PA11_PA12_RMP;
如果不设置 CAN_Init(CAN, &CAN_InitStructure);会初始化失败
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