串口通訊 stm32

文件：mian.c

//功能：串口初始化、打開定時器中斷，而後一直接收數據狀態就行了。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，定義高速時鐘的啓動狀態
  RCC_DeInit();                   //RCC系統重置，用於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;    //複用推輓輸出
  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;   //複用浮空輸入
  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); //若是程序在RAM中調試那麼定義中斷向量表在RAM中不然在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;         //搶佔優先級 0
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;    //子優先級爲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;        //搶佔優先級 1
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;            //子優先級爲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;      //設置波特率爲115200bps
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;  //數據位8位
  USART_InitStructure.USART_StopBits = USART_StopBits_1;   //中止位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;  // 禁用最後一位,使對應的時鐘脈衝不會再輸出到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);    //使能發送緩衝空中斷
//USART_ITConfig(USART1, USART_IT_TC, ENABLE);    //使能發送完成中斷
  USART_ClearFlag(USART1,USART_FLAG_TC);         //清除發送完成標誌位
  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

//須要設置串口接收中斷和定時器3中斷，中斷時間爲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);    //接收字節到接收緩衝區
    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爲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)        //判斷是否爲定時器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從新清零       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;    }       }}