51單片機串口接收和發送資料

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第一種方法：在中斷中處理

typedef unsigned char         UINT8;volatile  UINT8 u8Uart_Data;void InitialUART0_Timer1(){        SCON = 0x50;        //2015-05-04    TMOD = 0x20;        TH1 = 0XFD;                              // 9600BPS     2015-05-04     wangrong    TL1 = 0XFD;    TR1 = 1;                               // start timer0    ES = 1;                             // Enable serial interrupt    EA = 1;                             // Enable global interrupt}//-----------------------------------------------------------------------------------------------------------void main (void){    //--------------------------------------------------------------------------------    InitialUART0_Timer1();                   // 9600 Baud Rate @ 11.0592MHz                        while(1)    {         //    Receive_Data_From_PC();        //Send_Data_To_PC(Receive_Data_From_PC());        while(recv_data)        {            recv_data = 0;            TI = 0;            SBUF = u8Uart_Data;        }                }}//-----------------------------------------------------------------------------------------------------------void UART_ISR(void) interrupt 4{    if (RI)    {                                   // If reception occur        RI = 0;                         // Clear reception flag for next reception        u8Uart_Data = 0;        u8Uart_Data = SBUF;             // Read receive data        recv_data = 1;        //SBUF = u8Uart_Data;           // Send back same data on UART       }    if (TI)                                // If emission occur    {                                   // Clear emission flag for next emission        TI = 0;    }}//-----------------------------------------------------------------------------------------------------------

第二種方法：不在中斷中處理

//-----------------------------------------------------------------------------------------------------------// Use timer1 as baud rate generatorvoid InitialUART0_Timer1(){        SCON = 0x50;        //2015-05-04    TMOD = 0x20;#if 0#ifdef FOSC_110592    TH1 = 256 - (28800/u32Baudrate); /* 11.059M/384=28800 */#endif#ifdef FOSC_184320    TH1 = 256 - (48000/u32Baudrate); /* 18.4320M/384=48000 */#endif#ifdef FOSC_221184     TH1 = 256 - (57600/u32Baudrate); /* 22.1184M/384=57600 */#endif#ifdef FOSC_331776     TH1 = 256 - (86400/u32Baudrate); /* 33.1776M/384=86400 */#endif#ifdef FOSC_368640     TH1 = 256 - (96000/u32Baudrate); /* 36.8640M/384=96000 */#endif#endif /*    #if 0    */        TH1 = 0XFD;                              // 9600BPS     2015-05-04     wangrong    TL1 = 0XFD;    TR1 = 1;                               // start timer0    ES = 1;                             // Enable serial interrupt    EA = 1;                             // Enable global interrupt}//-----------------------------------------------------------------------------------------------------------UINT8 Receive_Data_From_PC(void){    UINT8 c;    while (!RI);    c = SBUF;    RI = 0;    return (c);}//-----------------------------------------------------------------------------------------------------------void Send_Data_To_PC (UINT8 c){    while (!TI);    TI = 0;    SBUF = c;}//-----------------------------------------------------------------------------------------------------------//-----------------------------------------------------------------------------------------------------------void main (void){    //--------------------------------------------------------------------------------        InitialUART0_Timer1();                   // 9600 Baud Rate @ 11.0592MHz                        //---------------------------------------------------------------------------------            while(1)    {                 Receive_Data_From_PC();        Send_Data_To_PC(Receive_Data_From_PC());    }}

 

51單片機串口接收和發送資料