S3C2440——使用URAT0查询方式发送和接收字符串

• UART初始化函数

  void Uart_Init(int pclk,int baud)
  {
        
        
      int i;
      rGPHCON|=0xa0; //GPH2,GPH3 as TXD0,RXD0
      rGPHUP = 0x0;    //GPH2,GPH3内部上拉
      if(pclk == 0)
      pclk = PCLK;
      rUFCON0 = 0x0; //禁止3个通道的FIFO控制寄存器
      rUFCON1 = 0x0;
      rUFCON2 = 0x0;
      rUMCON0 = 0x0;
      rUMCON1 = 0x0;
      rUMCON2 = 0x0;    //初始化3个通道的MODEM控制寄存器，禁止AFC
      //Line control register 0: Normal,No parity,1 stop,8 bits.
      rULCON0=0x3;
      // Control register 0
      rUCON0  = 0x5;
      //Baud rate divisior register 0
      rUBRDIV0=( (int)(pclk/16./baud+0.5) -1 );
  }
  

• 接收1字节数据

  //接收一字节数据
  char Uart_Getch(void)
  {
        
        
      while(!(rUTRSTAT0 & 0x1)); //等待就绪
      //读错误状态寄存器UERSTATn
      if ((rUERSTAT0 & 0x1)|| (rUERSTAT0 & 0x4))
          return -1;
      return RdURXH0;  //0x50000027
  }
  

• 接收1个字符串

  //接收一个字符串
  void Uart_GetString(char *string)
  {
        
        
      char *string2 = string;
      char c;
      while((c = Uart_Getch())!=‘\r’)   //回车符
          *string++ = c;
  }
  

• 接收1个字符串，转换为数字

  int Uart_GetIntNum(void)
  {
        
        
      char str[30];
      char *string = str;
      int base     = 10;  //进制
      int minus    = 0;   //是否负数
      int result   = 0;    //转换的结果
      int lastIndex;       //字符串长度
      int i;
      Uart_GetString(string);
      if(string[0]=='-')
      {
        
        
          minus = 1;
          string++;
      }
  
      if(string[0]=='0' && (string[1]=='x' || string[1]=='X'))
      {
        
        
          base    = 16;
          string += 2;
      }
  
      lastIndex = strlen(string) - 1;
  
      if(lastIndex<0)
              return -1;
      if(string[lastIndex]=='h' || string[lastIndex]=='H' )
      {
        
        
          base = 16;
          string[lastIndex] = 0;
          lastIndex--;
      }
      if(base==10)
      {
        
        
          result = atoi(string);
          result = minus ? (-1*result):result;
      }
      else {
        
        
          for(i=0;i<=lastIndex;i++) {
        
        
              if(isalpha(string[i]))
              {
        
        
                  if(isupper(string[i]))
                      result = (result<<4) + string[i] - ‘A’ + 10;//之前的结果乘16，再加当前数字
                  else
                      result = (result<<4) + string[i] - 'a' + 10;
              }
              else
              {
        
        
                  result = (result<<4) + string[i] - '0';
              }
              result = minus ? (-1*result):result;
      }
      return result;
  }
  

• 发送一字节

  //发送一字节
  //#define WrUTXH0(ch)  ( * (volatile unsigned char * )0x50000023)=(unsigned char)(ch)
  
  void Uart_SendByte(int data)
  {
        
        
      while(!(rUTRSTAT0 & 0x4));
      Delay(10);  //because the slow response of hyper_terminal
      WrUTXH0(data);
  }
  

• 送一个字符串

  //发送一个字符串
  void Uart_SendString(char *pt)
  {
        
        
      while(*pt)
          Uart_SendByte(*pt++);
  }
  

• 2410addr.h 定义UART各个寄存器的头文件

  //2410addr.h  定义UART各个寄存器的头文件
  #define rULCON0 ( * (volatile unsigned * )0x50000000)  //UART 0 Line control
  #define rUCON0 ( * (volatile unsigned * )0x50000004)  //UART 0 control
  #define rUFCON0 ( * (volatile unsigned * )0x50000008)  //UART 0 FIFO control
  #define rUMCON0 ( * (volatile unsigned * )0x5000000c)  //UART 0 Modem control
  #define rUTRSTAT0 ( * (volatile unsigned * )0x50000010)  //UART 0 Tx/Rx status
  #define rUERSTAT0 ( * (volatile unsigned * )0x50000014)  //UART 0 Rx error status
  #define rUFSTAT0 ( * (volatile unsigned * )0x50000018)  //UART 0 FIFO status
  #define rUMSTAT0 ( * (volatile unsigned * )0x5000001c)  //UART 0 Modem status
  #define rUBRDIV0 ( * (volatile unsigned * )0x50000028)  //UART 0 Baud rate diviaor
  #define rULCON1 ( * (volatile unsigned * )0x50004000)  //UART 1 Line control
  #define rUCON1 ( * (volatile unsigned * )0x50004004)  //UART 1 Control
  #define rUFCON1 ( * (volatile unsigned * )0x50004008)  //UART 1 FIFO control
  #define rUMCON1 ( * (volatile unsigned * )0x5000400c)  //UART 1 Modem control
  #define rUTRSTAT1  ( * (volatile unsigned * )0x50004010)  //UART 1 Tx/Rx status
  #define rUERSTAT1  ( * (volatile unsigned * )0x50004014)  //UART 1 Rx error status
  #define rUFSTAT1 ( * (volatile unsigned * )0x50004018)  //UART 1 FIFO status
  #define rUMSTAT1  ( * (volatile unsigned * )0x5000401c)  //UART 1 Modem status
  #define rUBRDIV1  ( * (volatile unsigned * )0x50004028)  //UART 1 Baud rate divisor
  #define rULCON2  ( * (volatile unsigned * )0x50008000)  //UART 2 Line control
  #define rUCON2 ( * (volatile unsigned * )0x50008004)  //UART 2 Control
  #define rUFCON2 ( * (volatile unsigned * )0x50008008)  //UART 2 FIFO control
  #define rUMCON2 ( * (volatile unsigned * )0x5000800c)   //UART 2 Modem control
  #define rUTRSTAT2  ( * (volatile unsigned * )0x50008010)  //UART 2 Tx/Rx status
  #define rUERSTAT2  ( * (volatile unsigned * )0x50008014)  //UART 2 Rx error status
  #define rUFSTAT2 ( * (volatile unsigned * )0x50008018)  //UART 2 FIFO status
  #define rUMSTAT2  ( * (volatile unsigned * )0x5000801c)  //UART 2 Modem status
  #define rUBRDIV2  ( * (volatile unsigned * )0x50008028)  //UART 2 Baud rate divisor
  #if def_BIG_ENDIAN
  #define rUTXH0  ( * (volatile unsigned char * )0x50000023)  //UART 0 Transmission Hold
  #define rURXH0  ( * (volatile unsigned char * )0x50000027)  //UART 0 Receive buffer
  #define rUTXH1  ( * (volatile unsigned char * )0x50004023)  //UART 1 Transmission Hold
  #define rURXH1  ( * (volatile unsigned char * )0x50004027)  //UART 1 Receive buffer
  #define rUTXH2  ( * (volatile unsigned char * )0x50008023)  //UART 2 Transmission Hold
  #define rURXH2  ( * (volatile unsigned char * )0x50008027)  //UART 2 Receive buffer
  #define WrUTXH0(ch)  ( * (volatile unsigned char * )0x50000023)=(unsigned char)(ch)
  #define RdURXH0  ( * (volatile unsigned char * )0x50000027)
  #define WrUTXH1(ch)  ( * (volatile unsigned char * )0x50004023)=(unsigned char)(ch)
  #define RdURXH1()  ( * (volatile unsigned char * )0x50004027)
  #define WrUTXH20(ch)  ( * (volatile unsigned char * )0x50008023)=(unsigned char)(ch)
  #define RdURXH2()  ( * (volatile unsigned char * )0x50008027)
  #define UTXH0     (0x50000020+3)  //Byte_access address by DMA
  #define URXH0     (0x50000024+3)
  #define UTXH1     (0x50004020+3)
  #define URXH1     (0x50004024+3)
  #define UTXH2     (0x50008020+3 )
  #define URXH2     (0x50008024+3)
  #else//Little Endian
  #define rUTXH0  ( * (volatile unsigned char * )0x50000020)//UART 0 Transmission Hold
  #define rURXH0  ( * (volatile unsigned char * )0x50000024)//UART 0 Receive buffer
  #define rUTXH1  ( * (volatile unsigned char * )0x50004020)//UART 1 Transmission Hold
  #define rURXH1  ( * (volatile unsigned char * )0x50004024)//UART 1 Receive buffer
  #define rUTXH2  ( * (volatile unsigned char * )0x50000820)//UART 2 Transmission Hold
  #define rURXH2  ( * (volatile unsigned char * )0x50008024)//UART 2 Receive buffer
  #define WrUTXH0(ch)  ( * (volatile unsigned char * )0x50000020)=(unsigned char)(ch)
  #define RdURXH0  ( * (volatile unsigned char * )0x50000024)
  #define WrUTXH1(ch)  ( * (volatile unsigned char * )0x50004020)=(unsigned char)(ch)
  #define RdURXH1()  ( * (volatile unsigned char * )0x50004024)
  #define WrUTXH2(ch)  ( * (volatile unsigned char * )0x50008020)=(unsigned char)(ch)
  #define RdURXH2()  ( * (volatile unsigned char * )0x50008024)
  #define UTXH0     (0x50000020+3)  //Byte_access address by DMA
  #define URXH0     (0x50000024+3)
  #define UTXH1     (0x50004020+3)
  #define URXH1     (0x50004024+3)
  #define UTXH2     (0x50008020+3 )
  #define URXH2     (0x50008024+3)
  #endif