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      1. 專注電子技術學習與研究
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        stm32應用-簡單的串口接收與發送程序

        作者:碧海藍天   來源:來自碧海藍天   點擊數:  更新時間:2014年07月30日   【字體:
        與上位機的串口通信是一個很常用的程序。碧海藍天在剛剛接觸stm32芯片時寫的第一個簡單程序就是串口通信,現在把程序代碼甩出來與大家分享。完整的程序哦~一般人我不告訴他

         庫版本 ST3.0.0

        文件:mian.c

        //功能:串口初始化、打開定時器中斷,然后一直接收數據狀態就好了。發送在中斷中實現

        #include "stm32f10x.h"
        #include "usart.h"

        u8 USART_rx_data;
        int main(void)
        {
          
          RCC_Configuration();      //系統時鐘配置
          GPIO_Configuration();      //端口初始化
          NVIC_Configuration();      //中斷源配置
          USART_Configuration();     //串口1初始化
          Time_Init();            //定時器初始化
          #ifdef DEBUG
              debug();
          #endif
          TIM_Cmd(TIM3,ENABLE); 
           while(1)
           {

           }

        }

         

         

        文件:usart.c

        #include "stm32f10x.h"
        #include "stdio.h"
        #include "usart.h"
          unsigned char auchCRCHi [256] ={
          0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
          0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
          0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
          0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
          0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
          0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
          0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
          0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
          0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
          0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
          0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
          0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
          0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
          0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
          0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
          0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40};
          unsigned char auchCRCLo [256] ={
          0x00,0xC0,0xC1,0x01,0xC3,0x03,0x02,0xC2,0xC6,0x06,0x07,0xC7,0x05,0xC5,0xC4,0x04,
          0xCC,0x0C,0x0D,0xCD,0x0F,0xCF,0xCE,0x0E,0x0A,0xCA,0xCB,0x0B,0xC9,0x09,0x08,0xC8,
          0xD8,0x18,0x19,0xD9,0x1B,0xDB,0xDA,0x1A,0x1E,0xDE,0xDF,0x1F,0xDD,0x1D,0x1C,0xDC,
          0x14,0xD4,0xD5,0x15,0xD7,0x17,0x16,0xD6,0xD2,0x12,0x13,0xD3,0x11,0xD1,0xD0,0x10,
          0xF0,0x30,0x31,0xF1,0x33,0xF3,0xF2,0x32,0x36,0xF6,0xF7,0x37,0xF5,0x35,0x34,0xF4,
          0x3C,0xFC,0xFD,0x3D,0xFF,0x3F,0x3E,0xFE,0xFA,0x3A,0x3B,0xFB,0x39,0xF9,0xF8,0x38,
          0x28,0xE8,0xE9,0x29,0xEB,0x2B,0x2A,0xEA,0xEE,0x2E,0x2F,0xEF,0x2D,0xED,0xEC,0x2C,
          0xE4,0x24,0x25,0xE5,0x27,0xE7,0xE6,0x26,0x22,0xE2,0xE3,0x23,0xE1,0x21,0x20,0xE0,
          0xA0,0x60,0x61,0xA1,0x63,0xA3,0xA2,0x62,0x66,0xA6,0xA7,0x67,0xA5,0x65,0x64,0xA4,
          0x6C,0xAC,0xAD,0x6D,0xAF,0x6F,0x6E,0xAE,0xAA,0x6A,0x6B,0xAB,0x69,0xA9,0xA8,0x68,
          0x78,0xB8,0xB9,0x79,0xBB,0x7B,0x7A,0xBA,0xBE,0x7E,0x7F,0xBF,0x7D,0xBD,0xBC,0x7C,
          0xB4,0x74,0x75,0xB5,0x77,0xB7,0xB6,0x76,0x72,0xB2,0xB3,0x73,0xB1,0x71,0x70,0xB0,
          0x50,0x90,0x91,0x51,0x93,0x53,0x52,0x92,0x96,0x56,0x57,0x97,0x55,0x95,0x94,0x54,
          0x9C,0x5C,0x5D,0x9D,0x5F,0x9F,0x9E,0x5E,0x5A,0x9A,0x9B,0x5B,0x99,0x59,0x58,0x98,
          0x88,0x48,0x49,0x89,0x4B,0x8B,0x8A,0x4A,0x4E,0x8E,0x8F,0x4F,0x8D,0x4D,0x4C,0x8C,
          0x44,0x84,0x85,0x45,0x87,0x47,0x46,0x86,0x82,0x42,0x43,0x83,0x41,0x81,0x80,0x40};


        unsigned short CRC16(unsigned char* puchMsg, unsigned short usDataLen)
        {


          unsigned char uchCRCHi = 0xFF ;
          unsigned char uchCRCLo = 0xFF ;
          unsigned char uIndex ;
          while (usDataLen--)
          {
            uIndex = uchCRCHi^*puchMsg++;
            uchCRCHi = uchCRCLo^auchCRCHi[uIndex];
            uchCRCLo = auchCRCLo[uIndex];
          }
          return (uchCRCHi << 8 | uchCRCLo) ;
        }


        void RCC_Configuration(void)
        {
          ErrorStatus HSEStartUpStatus;      //枚舉變量,定義高速時鐘的啟動狀態
          RCC_DeInit();                   //RCC系統重置,用于Debug目的
          RCC_HSEConfig(RCC_HSE_ON);                 //使能高速時鐘源HSE  
          HSEStartUpStatus = RCC_WaitForHSEStartUp();    //等待HSE穩定
          if(HSEStartUpStatus == SUCCESS)
          {
            FLASH_SetLatency(FLASH_Latency_2);     
         FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);     
           
            RCC_HCLKConfig(RCC_SYSCLK_Div1);         // HCLK = SYSCLK
            RCC_PCLK2Config(RCC_HCLK_Div1);          // PCLK2 = HCLK
            RCC_PCLK1Config(RCC_HCLK_Div2);         ///PCLK1 = HCLK/2
         
            RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
            RCC_PLLCmd(ENABLE);
            while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET){}

           
            RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
            while(RCC_GetSYSCLKSource() != 0x08){}
          }
          RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 |RCC_APB2Periph_GPIOA |RCC_APB2Periph_AFIO |RCC_APB2Periph_GPIOB , ENABLE);
          RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
        }
        //------------------------------------------------------------------
        //函數名:void GPIO_Configuration()
        //輸入參數:null
        //返回參數:null
        //說明:GPIO初始化函數
        //------------------------------------------------------------------
        void GPIO_Configuration(void)
        {
          GPIO_InitTypeDef GPIO_InitStructure;     //GPIO初始化結構體聲明
         
         
          GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;          //USART1 TX
          GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    //復用推挽輸出
          GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  
          GPIO_Init(GPIOA, &GPIO_InitStructure);      //A端口
         
          GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;          //USART1 RX
          GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   //復用浮空輸入
          GPIO_Init(GPIOA, &GPIO_InitStructure);           //A端口

         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; 
         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  
         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
         GPIO_Init(GPIOB, &GPIO_InitStructure);
        }

        //------------------------------------------------------------------
        //函數名:void NVIC_Configuration()
        //輸入參數:null
        //返回參數:null
        //說明:NVIC初始化函數
        //------------------------------------------------------------------
        void NVIC_Configuration(void)
                     
          NVIC_InitTypeDef NVIC_InitStructure;       //NVIC初始化結構體聲明
         
          #ifdef VECT_TAB_RAM       
           
            NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); //如果程序在RAM中調試那么定義中斷向量表在RAM中否則在Flash中
          #else 
           
            NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);  
          #endif

           
          NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

          
          NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;         //設置串口1中斷
          NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;         //搶占優先級 0
          NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;    //子優先級為0
          NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;     //使能
          NVIC_Init(&NVIC_InitStructure);

          NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;           //設置定時器3全局中斷
          NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;        //搶占優先級 1
          NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;            //子優先級為0
          NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;           //使能
          NVIC_Init(&NVIC_InitStructure);
        }
        //------------------------------------------------------------------
        //函數名:void USART_Configuration()
        //輸入參數:null
        //返回參數:null
        //說明:串口初始化函數
        //------------------------------------------------------------------
        void USART_Configuration(void){
          USART_InitTypeDef USART_InitStructure;                   //串口初始化結構體聲明
          USART_ClockInitTypeDef USART_ClockInitStruct;
          USART_InitStructure.USART_BaudRate = 115200;      //設置波特率為115200bps
          USART_InitStructure.USART_WordLength = USART_WordLength_8b;  //數據位8位
          USART_InitStructure.USART_StopBits = USART_StopBits_1;   //停止位1位
          USART_InitStructure.USART_Parity = USART_Parity_No;    //無校驗位
          USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;   //無硬件流控
          USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;     //接受和發送模式都打開

          USART_ClockInitStruct.USART_Clock=USART_Clock_Disable;      //串口時鐘禁止
          USART_ClockInitStruct.USART_CPOL=USART_CPOL_Low;        //數據低電平有效
          USART_ClockInitStruct.USART_CPHA=USART_CPHA_2Edge;    //配置CPHA使數據在第2個邊沿的時候被捕獲
          USART_ClockInitStruct.USART_LastBit=USART_LastBit_Disable;  // 禁用最后一位,使對應的時鐘脈沖不會再輸出到SCLK引腳
          USART_ClockInit(USART1, &USART_ClockInitStruct);      //配置USART與時鐘相關的設置

          USART_Init(USART1, &USART_InitStructure);       //配置串口參數函數

          USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);       //使能接收中斷
        //USART_ITConfig(USART1, USART_IT_TXE, ENABLE);    //使能發送緩沖空中斷
        //USART_ITConfig(USART1, USART_IT_TC, ENABLE);    //使能發送完成中斷
          USART_ClearFlag(USART1,USART_FLAG_TC);         //清除發送完成標志位
          USART_Cmd(USART1, ENABLE);         //使能串口1
        }
        //------------------------------------------------------------------
        //函數名:void Time_Init()
        //輸入參數:null
        //返回參數:null
        //說明:定時器初始化函數
        //------------------------------------------------------------------
        void Time_Init(void)
        {
          TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

          TIM_DeInit(TIM3);            //復位TIM3定時器
          TIM_TimeBaseStructure.TIM_Period =7999;          //設置自動重裝載寄存器鎖存值,1ms溢出      
          TIM_TimeBaseStructure.TIM_Prescaler = 8;      //9分頻 
          TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;       //時鐘分頻因子           
          TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //計數器向上計數模式                     
          
          TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);    //寫TIM3各寄存器參數

          TIM_ClearFlag(TIM3,TIM_FLAG_Update);

          TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);

        }

         

         

        文件:usart.h

        #ifndef _USART_H
        #define _USART_H

        #include
        #include "stm32f10x.h"


        void RCC_Configuration(void);   //聲明RCC初始化函數
        void GPIO_Configuration(void);   //聲明GPIO初始化函數
        void NVIC_Configuration(void);   //聲明NVIC初始化函數
        void USART_Configuration(void);   //聲明串口初始化函數
        void Time_Init(void);     //聲明定時器初始化函數
        unsigned short CRC16(unsigned char* puchMsg, unsigned short usDataLen);

         

        #endif

         

         

        文件:stm32f103x_it.c

        //需要設置串口接收中斷和定時器3中斷,中斷時間為1ms

        //------------------------------------------------------------------
        //函數名:void USART1_IRQHandler(void)
        //輸入參數:null
        //返回參數:null
        //說明:串口接收中斷服務
        //------------------------------------------------------------------
        void USART1_IRQHandler(void)
        {
          
          if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)          //判斷讀寄存器是否非空
               
        //    GPIO_SetBits(GPIOB,GPIO_Pin_6);
            rx_data[RbufCounter++]=USART_ReceiveData(USART1);    //接收字節到接收緩沖區
            if(USART_Rsv_Status==0)
            {
              if(RbufCounter>1)
              {
                if(rx_data[0]==0xA5&&rx_data[1]==0x5A)    //當接收到的數據幀頭兩個字節同時為0xA5和0x5A時
                {
                  USART_Rsv_Status=1;
        //           USART_SendData(USART1, rx_data[0]);
                }
                else
                {
                  rx_data[0]=rx_data[1];
                  RbufCounter=1;
                 
                }
              }
            }
            else
            {
              USART_1ms_Cnt=0;
                          
                  
        }
        //------------------------------------------------------------------
        //函數名:void TIM2_IRQHandler(void)
        //輸入參數:null
        //返回參數:null
        //說明:定時器2中斷服務
        //------------------------------------------------------------------
        void TIM2_IRQHandler(void)
        {

         

        }
        //------------------------------------------------------------------
        //函數名:void TIM3_IRQHandler(void)
        //輸入參數:null
        //返回參數:null
        //說明:定時器3中斷服務
        //------------------------------------------------------------------
        void TIM3_IRQHandler(void)

          if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET)        //判斷是否為定時器3溢出中斷
          {
            
            GPIO_SetBits(GPIOB,GPIO_Pin_6);
            TIM_ClearITPendingBit(TIM3, TIM_IT_Update);  //清中斷標記

            if(USART_Rsv_Status==1)
            USART_1ms_Cnt++;
            if(USART_1ms_Cnt>5)     
            {
        //      USART_SendData(USART1,0xAA);
              USART_Rsv_Status=0;     //連續計數超過5次對USART_Rsv_Status置0,繼續等待接收
              USART_1ms_Cnt=0;         //當USART_1ms_Cnt>5時對USART_1ms_Cnt重新清零 
              if(RbufCounter==(u16)rx_data[4]+7)              //檢驗數據的完整性
              {
                 int i;     //定義循環變量
                int j;
                data_length=rx_data[4];
                for(i=0;i
                {
                  data[i]=rx_data[i];
                
                CRC_data_Hi=rx_data[RbufCounter-1];
                CRC_data_Lo=rx_data[RbufCounter-2];
                CRC_data=CRC16((unsigned char*)data,data_length+5);
                CRC_data_Hi1=CRC_data>>8;
                CRC_data_Lo1=CRC_data&0x00ff;
                 if(CRC_data_Hi==(u8)CRC_data_Hi1 && CRC_data_Lo==CRC_data_Lo1)
                 {
                   for(j=0;rx_data[j]!='\0';j++)   //循環逐字輸出,到結束字'\0'
                         
                     USART_SendData(USART1, rx_data[j]);     //發送字符
                     while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
                     {
                     } //等待字符發送完畢
                   }
                }
              }
              RbufCounter=0;
                
          }
        }

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