STM 32 之can 实例+代码解析
时间:10-02
整理:3721RD
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- #include "sysdef.h"
-
- #define MAX_MAIL_NUM 3
- //CAN总线调试:0=运行 1=自环调试
- #define CAN_DEBUG 0
- //CAN总线波特率:0=250kbps,1=500kbps,2=1Mbps
- #define CAN1_BPS 0
-
- unsigned char can1_addr = 0;
-
- unsigned short Can1_Tx_Count =0;
- unsigned short Can1_Rx_Count =0;
-
- unsigned short Can1_Send_Delay =0;
-
- unsigned char Can1_Send_Buf[10]={0xeb,0x90,0x01,0x55,0xAA};
- unsigned char Can1_Recv_Buf[10]={0};
- extern int angle_num ;
- extern unsigned int angle_data ;
-
- static u8 CAN_msg_num[MAX_MAIL_NUM]; // 发送邮箱标记
-
- void CAN1_Config_init(void)
- {
- CAN_InitTypeDef CAN_InitStructure;
- CAN_FilterInitTypeDef CAN_FilterInitStructure;
-
- /* CAN register init */
- CAN_DeInit(CAN1);
- CAN_StructInit(&CAN_InitStructure);
-
- /* CAN cell init */ //36MHz 500Kbps
- CAN_InitStructure.CAN_TTCM=DISABLE;//禁止时间触发通信模式
- CAN_InitStructure.CAN_ABOM=DISABLE;//软件对CAN_MCR寄存器的INRQ位进行置1随后清0后,一旦硬件检测
- //到128次11位连续的隐性位,就退出离线状态
- CAN_InitStructure.CAN_AWUM=DISABLE;//睡眠模式通过清除CAN_MCR寄存器的SLEEP位,由软件唤醒
- CAN_InitStructure.CAN_NART=DISABLE;//CAN报文是否只发1次,不管发送的结果如何(成功/出错或仲裁丢失)
- CAN_InitStructure.CAN_RFLM=DISABLE;//在接收到溢出时FIFO未被锁定,当接收到FIFO报文未被读出,下一个收到的报文会覆盖原有的报文
- CAN_InitStructure.CAN_TXFP=DISABLE;//发送的FIFO优先级由报文的标识符来决定
-
- #if CAN_DEBUG
- CAN_InitStructure.CAN_Mode= CAN_Mode_LoopBack;
- #else
- CAN_InitStructure.CAN_Mode= CAN_Mode_Normal;
- #endif
- //传输波特率
-
- if(CAN1_BPS == 0)
- {
- CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;//重新同步跳跃宽度1个时间单位
- CAN_InitStructure.CAN_BS1=CAN_BS1_12tq;//时间段1为9个时间单位
- CAN_InitStructure.CAN_BS2=CAN_BS2_3tq;//时间段2为8个时间单位
- CAN_InitStructure.CAN_Prescaler= 9;//36M/(1+12+3)/9= 250kbps
- //36M/(1+5+2)/9 = 500kbps
- //36M(1+2+1)/9 = 1M
- }
- else if(CAN1_BPS == 1)
- {
- CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;//重新同步跳跃宽度1个时间单位
- CAN_InitStructure.CAN_BS1=CAN_BS1_5tq;//时间段1为9个时间单位
- CAN_InitStructure.CAN_BS2=CAN_BS2_2tq;//时间段2为8个时间单位
- CAN_InitStructure.CAN_Prescaler= 9;//36M/(1+12+3)/9= 250kbps
-
- }
- else
- {
- CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;//重新同步跳跃宽度1个时间单位
- CAN_InitStructure.CAN_BS1=CAN_BS1_2tq;//时间段1为9个时间单位
- CAN_InitStructure.CAN_BS2=CAN_BS2_1tq;//时间段2为8个时间单位
- CAN_InitStructure.CAN_Prescaler= 9;//36M/(1+12+3)/9= 250kbps
-
- }
- CAN_Init(CAN1,&CAN_InitStructure);
-
- /* CAN filter init */
- CAN_FilterInitStructure.CAN_FilterNumber=0; //指定了待初始化的过滤器0
- CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;//指定了过滤器将被初始化到的模式为标识符屏蔽位模式
- CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;;//给出了过滤器位宽1个32位过滤器
- CAN_FilterInitStructure.CAN_FilterIdHigh=0x0000;//用来设定过滤器标识符(32位位宽时为其高段位,16位位宽时为第一个)
- CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;;//用来设定过滤器标识符(32位位宽时为其低段位,16位位宽时为第二个)
- CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x0000;//用来设定过滤器屏蔽标识符或者过滤器标识符(32位位宽时为其高段位,16位位宽时为第一个)
- CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;//用来设定过滤器屏蔽标识符或者过滤器标识符(32位位宽时为其低段位,16位位宽时为第二个)
- CAN_FilterInitStructure.CAN_FilterFIFOAssignment=CAN_FIFO0;;//设定了指向过滤器的FIFO0
- CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;//使能过滤器
- CAN_FilterInit(&CAN_FilterInitStructure);
-
- }
-
- // ***************************************************************
- // BaudRate = 1 / NominalBitTime
- // NominalBitTime = 1tq + tBS1 + tBS2
- // tq = (BRP[9:0] + 1) x tPCLK
- // tPCLK = CAN's clock = APB1's clock
- // 1Mbps 速率下,采用点的位置在6tq位置处,BS1=5, BS2=2
- // 500kbps 速率下,采用点的位置在8tq位置处,BS1=7, BS2=3
- // 250kbps 速率下,采用点的位置在14tq位置处,BS1=13, BS2=2
- // 125k, 100k, 50k, 20k, 10k 的采用点位置与 250K 相同
- // ****************************************************************
-
- void CAN1_Com_init(void)
- {
- GPIO_InitTypeDef GPIO_InitStruct;
- NVIC_InitTypeDef NVIC_InitStructure;
-
- /* Enable CAN RX0 interrupt IRQ channel */
- NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
-
- NVIC_InitStructure.NVIC_IRQChannel = USB_HP_CAN1_TX_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
-
- NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX1_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
-
-
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
- //Can Rx
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_11;
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
- GPIO_Init(GPIOA,&GPIO_InitStruct);
-
- //Can Tx
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_12;
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOA,&GPIO_InitStruct);
-
- CAN1_Config_init();
-
- CAN_ITConfig(CAN1,CAN_IT_FMP0 | CAN_IT_FF0 | CAN_IT_FOV0, ENABLE); // fifo0中断
- CAN_ITConfig(CAN1,CAN_IT_FMP1 | CAN_IT_FF1 | CAN_IT_FOV1, ENABLE); // fifo1中断
- CAN_ITConfig(CAN1,CAN_IT_TME, DISABLE); // 发送中断
- CAN_ITConfig(CAN1,CAN_IT_EWG | CAN_IT_EPV | CAN_IT_BOF | CAN_IT_LEC | CAN_IT_ERR | CAN_IT_WKU | CAN_IT_SLK, ENABLE); // ERR中断
-
- // CAN缓存初始化
- memset(CAN_msg_num,0,MAX_MAIL_NUM);
- }
-
-
- int CAN1_Tx_msg(CanTxMsg TxMessage)
- {
- u8 TransmitMailbox = 0;
-
- TransmitMailbox = CAN_Transmit(CAN1,&TxMessage);
- if(CAN_NO_MB == TransmitMailbox)
- {
- //发送失败
- return 0;
- }
- else
- {
- CAN_msg_num[TransmitMailbox] = 1;
-
- }
- CAN_ITConfig(CAN1,CAN_IT_TME, ENABLE);
-
- return 1;
- }
-
-
- u16 angle=0,angle_h=0,angle_l=0;
- extern unsigned char angle_dir;
- int CAN1_Tx_data(void)
- {
- CanTxMsg TxMessage;
- u8 TransmitMailbox = 0,i=0;
-
- /* transmit */
- TxMessage.StdId=0x6f1;//设定标准标识符
- TxMessage.ExtId=0x1234;//设置扩展标识符
- TxMessage.RTR=CAN_RTR_DATA;//设定待传输消息的帧类型
- TxMessage.IDE=CAN_ID_STD;//设定消息标识符的类型
- TxMessage.DLC=6; //数据长度
-
- angle=angle_data/10;
- if(angle>9999) angle=9999;
- angle_h=angle/100;
- angle_h=angle_h/10*16+angle_h%10;
- angle_l=angle%100;
- angle_l=angle_l/10*16+angle_l%10;
- Can1_Send_Buf[0]=angle_num; //圈数
- Can1_Send_Buf[1]=angle_h; //总角度
- Can1_Send_Buf[2]=angle_l;
- Can1_Send_Buf[3]=0;
- Can1_Send_Buf[4]=0;
- Can1_Send_Buf[5]=angle_dir;
-
- for(i=0;i < TxMessage.DLC;i++)
- {
- TxMessage.Data[i] = Can1_Send_Buf[i];
- }
-
- TransmitMailbox = CAN_Transmit(CAN1,&TxMessage);
- if(CAN_NO_MB == TransmitMailbox)
- {
- //发送失败,没有空邮箱
- return 0;
- }
- else
- {
- CAN_msg_num[TransmitMailbox] = 1;
- }
- CAN_ITConfig(CAN1,CAN_IT_TME, ENABLE);
-
- Can1_Tx_Count++;
- if(Can1_Tx_Count > 10000)
- Can1_Tx_Count =0;
-
- Can1_Send_Delay =200;
- return 1;
- }
-
- //解析数据
- void CAN1_Rx_Data(CanRxMsg RxMessage)
- {
- u8 i =0;
- if((RxMessage.StdId==0x6f1) && (RxMessage.IDE==CAN_ID_STD) && ((RxMessage.Data[1]|RxMessage.Data[0]<<8)==0xEB90))
- {
-
- for(i=0;i < RxMessage.DLC;i++)
- {
- Can1_Recv_Buf[i] = RxMessage.Data[i];
- }
-
- Can1_Rx_Count++;
- if(Can1_Rx_Count > 10000)
- Can1_Rx_Count =0;
- }
- }
- //发送完中断函数
- void CAN1_Send(void)
- {
- if(CAN_msg_num[0])
- {
- if(CAN_GetITStatus(CAN1,CAN_IT_RQCP0))
- {
- CAN_ClearITPendingBit(CAN1,CAN_IT_RQCP0);
- CAN_ITConfig(CAN1,CAN_IT_TME, DISABLE);
- CAN_msg_num[0] = 0;
- }
- }
- if(CAN_msg_num[1])
- {
- if(CAN_GetITStatus(CAN1,CAN_IT_RQCP1))
- {
- CAN_ClearITPendingBit(CAN1,CAN_IT_RQCP1);
- CAN_ITConfig(CAN1,CAN_IT_TME, DISABLE);
- CAN_msg_num[1] = 0;
- }
- }
- if(CAN_msg_num[2])
- {
- if(CAN_GetITStatus(CAN1,CAN_IT_RQCP2))
- {
- CAN_ClearITPendingBit(CAN1,CAN_IT_RQCP2);
- CAN_ITConfig(CAN1,CAN_IT_TME, DISABLE);
- CAN_msg_num[2] = 0;
- }
- }
- }
- //接收中断函数
- void CAN1_Recv(unsigned char num)
- {
- CanRxMsg RxMessage;
- switch(num)
- {
- case 0:
- if(CAN_GetITStatus(CAN1,CAN_IT_FF0))
- {
- CAN_ClearITPendingBit(CAN1,CAN_IT_FF0);
- }
- else if(CAN_GetITStatus(CAN1,CAN_IT_FOV0))
- {
- CAN_ClearITPendingBit(CAN1,CAN_IT_FOV0);
- }
- else
- {
- CAN_Receive(CAN1,CAN_FIFO0, &RxMessage);
- //解析数据:
- CAN1_Rx_Data(RxMessage);
- }
- break;
- case 1:
- if(CAN_GetITStatus(CAN1,CAN_IT_FF1))
- {
- CAN_ClearITPendingBit(CAN1,CAN_IT_FF1);
- }
- else if(CAN_GetITStatus(CAN1,CAN_IT_FOV1))
- {
- CAN_ClearITPendingBit(CAN1,CAN_IT_FOV1);
- }
- else
- {
- CAN_Receive(CAN1,CAN_FIFO1, &RxMessage);
- //解析数据
- CAN1_Rx_Data(RxMessage);
- }
- break;
- }
- }
-
- void CAN1_Main(unsigned char flg )
- {
- if(flg)
- {
- if(Can1_Send_Delay == 0)
- CAN1_Tx_data();
- }
- }
谢谢分享学习一下
谢谢分享学习一下
高手! 学习学习!
谢谢分享学习一下
谢谢分享学习
看不懂啊看不懂啊
确实 没有说明啊 没有说明
初学者谢过!非常有用!谢谢前辈
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好的代码风格,会有注释说明,起码会在重要语句
为毛一点注释也没有呢?
小编辛苦了,感谢分享。
看看,,,,,,,,,,,,,
谢谢小编分享受
小编辛苦了,感谢分享。
小编辛苦了,感谢分享
辛苦了,谢谢分享。
请问要如何实现这个功能:A和B两块开发板,A首先给B发送数据,B收到数据后,B重新发送一个新的数据给A,A收到后再发送一个新的数据给B,如此循环。
小编的程序似乎无法满足这个功能。
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