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@@ -0,0 +1,114 @@
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+#include "can.h"
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+#include <string.h>
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+
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+/**
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+ * @brief CAN配置
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+ * @param
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+ * @retval None
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+ * @note 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
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+ tbs2:时间段2的时间单元.范围:1~8;
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+ tbs1:时间段1的时间单元.范围:1~16; CAN_BS1_1tq ~CAN_BS1_16tq
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+ brp :波特率分频器.范围:1~1024;(实际要加1,也就是1~1024) tq=(brp)*tpclk1
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+ 注意以上参数任何一个都不能设为0,否则会乱.
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+ 波特率=Fpclk1/((tsjw+tbs1+tbs2)*brp);
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+ mode:0,普通模式;1,回环模式;
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+ 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);
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+ 则波特率为:36M/((1+8+7)*5)=450Kbps
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+ */
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+u8 CAN_Mode_Init(u8 tsjw,u8 tbs1,u8 tbs2,u16 brp,u8 mode)
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+{
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+ GPIO_InitTypeDef GPIO_InitStructure;
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+ CAN_InitTypeDef CAN_InitStructure;
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+ CAN_FilterInitTypeDef CAN_FilterInitStructure;
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+ NVIC_InitTypeDef NVIC_InitStructure;
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+
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+ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); //使能PORTA时钟
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+ RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE); //使能CAN1时钟
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+ // CAN_Tx
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+ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
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+ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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+ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽
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+ GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化IO
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+ // CAN_Rx
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+ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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+ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入
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+ GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化IO
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+
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+ //CAN单元设置 MCR
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+ CAN_InitStructure.CAN_TTCM=DISABLE; //非时间触发通信模式 //
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+ CAN_InitStructure.CAN_ABOM=ENABLE; //软件自动离线管理 //
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+ CAN_InitStructure.CAN_AWUM=DISABLE; //睡眠模式通过软件唤醒(清除CAN->MCR的SLEEP位)//
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+ CAN_InitStructure.CAN_NART=ENABLE; //禁止报文自动传送 //只发一次,不管成功与否
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+ CAN_InitStructure.CAN_RFLM=DISABLE; //报文不锁定,新的覆盖旧的 //
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+ CAN_InitStructure.CAN_TXFP=DISABLE; //优先级由报文标识符决定 //
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+ //设置CAN1波特率
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+ CAN_InitStructure.CAN_Mode= mode; //模式设置: mode:0,普通模式;1,回环模式; //
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+ 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
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+ CAN_InitStructure.CAN_BS1=tbs1; //Tbs1=tbs1+1个时间单位CAN_BS1_1tq ~CAN_BS1_16tq
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+ CAN_InitStructure.CAN_BS2=tbs2; //Tbs2=tbs2+1个时间单位CAN_BS2_1tq ~ CAN_BS2_8tq
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+ CAN_InitStructure.CAN_Prescaler=brp;//分频系数(Fdiv)为brp+1 //
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+ CAN_Init(CAN1, &CAN_InitStructure);
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+ //配置滤波器组0
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+ CAN_FilterInitStructure.CAN_FilterNumber=0; //过滤器0 共28组
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+ CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask; //标志位ID模式 CAN_FilterMode_IdList
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+ CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit; //32位 CAN_FilterScale_16bit
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+// CAN_FilterInitStructure.CAN_FilterIdHigh=0x111<<5; //32位ID //基本ID放入到STID中
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+// CAN_FilterInitStructure.CAN_FilterIdLow=0|CAN_ID_STD;
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+// CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x222<<5; //32位MASK
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+// CAN_FilterInitStructure.CAN_FilterMaskIdLow=0|CAN_ID_STD;
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+ CAN_FilterInitStructure.CAN_FilterIdHigh=0x0000; //32位ID //基本ID放入到STID中
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+ CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;
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+ CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x0000; //32位MASK
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+ CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;
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+ CAN_FilterInitStructure.CAN_FilterFIFOAssignment=CAN_Filter_FIFO0; //过滤器0关联到FIFO0
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+ CAN_FilterInitStructure.CAN_FilterActivation=ENABLE; //激活过滤器0
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+ CAN_FilterInit(&CAN_FilterInitStructure); //滤波器初始化
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+
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+ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
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+
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+ NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
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+ NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; // 主优先级为1
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+ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; // 次优先级为0
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+ NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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+ NVIC_Init(&NVIC_InitStructure);
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+
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+ CAN_ITConfig(CAN1,CAN_IT_FMP0,ENABLE); //FIFO0消息挂号中断允许
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+ return 0;
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+}
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+u8 canbuff[8];
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+//CAN1接收中断服务函数
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+void USB_LP_CAN1_RX0_IRQHandler(void)
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+{
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+ CanRxMsg RxMessage;
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+
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+ CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);
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+
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+ if(RxMessage.StdId == 0x200)
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+ {
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+ memcpy(canbuff,RxMessage.Data,8);
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+ }
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+}
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+//len:数据长度(最大为8)
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+//msg:数据指针,最大为8个字节.
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+//返回值:0,成功;
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+// 其他,失败;
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+u8 Can_Send_Msg(u32 canid,u8* msg,u8 len)
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+{
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+ u8 mbox;
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+ u16 i=0;
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+ CanTxMsg TxMessage;
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+ TxMessage.StdId=canid; // 标准标识符为0
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+ TxMessage.ExtId=0x1012; // 设置扩展标示符(29位)
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+ TxMessage.IDE=CAN_Id_Standard; // 使用扩展标识符
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+ TxMessage.RTR=CAN_RTR_Data; // 消息类型为数据帧,一帧8位
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+ TxMessage.DLC=len; // 发送两帧信息
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+ for(i=0;i<len;i++)
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+ TxMessage.Data[i]=msg[i]; // 第一帧信息
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+ mbox= CAN_Transmit(CAN1, &TxMessage);
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+ i=0;
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+ while((CAN_TransmitStatus(CAN1, mbox)!=CAN_TxStatus_Ok)&&(i<0XFFF))i++; //等待发送结束
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+ if(i>=0XFFF)return 1;
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+ return 0;
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+
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+}
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+
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