那位兄弟对AT89C51RD2的寄存器熟悉

只看该作者 · 2007-11-27 12:31

我有ATMEL的两个串口例程，要转到STC的实验板上晶振18.432
而例程是11.0592，,波特率改成9600，我对寄存器不太熟悉

那位兄弟能改一下，函数的功能是串口把接收到的字符再发回去

DEMO1:

include "reg_c51.h"

char uart_data;

void main (void)
{
   SCON = 0x50; /* uart in mode 1 (8 bit), REN=1 */
   BDRCON &=0xEC;               /* BRR=0; SRC=0; */
   BDRCON |=0x0C;               /* TBCK=1;RBCK=1; SPD=0 */
   BRL=0xFD;                    /* 9600 Bds at 11.059MHz */
     ES = 1;                              /* Enable serial interrupt    */
    EA = 1;                             /* Enable global interrupt */
   BDRCON |=0x10;               /* Baud rate generator run*/

   while(1);                    /* endless */
}

void serial_IT(void) interrupt 4
{

    if (RI == 1)
    {        /* if reception occur */
      RI = 0;   /* clear reception flag for next reception */
      uart_data = SBUF;          /* Read receive data */
      SBUF = uart_data;    /* Send back same data on uart*/
    }
    else TI = 0;                  /* if emission occur */
      /* clear emission flag for next emission*/
}

//////////////////////////////////////////////////////////////////////

DEMO2:

#include "reg_c51.h"

char uart_data;

/void main (void)
{
    SCON = 0x50;    /*uart in mode 1 (8 bit), REN=1 */
   T2CON &= 0xF0;               /* EXEN2=0; TR2=0;C/T2#=0;CP/RL2#=0;*/
   T2CON |= 0x30;               /* RCLK = 1; TCLK=1; */
   TH2=0xFF;                    /* init value */
   TL2=0xFD;                    /* init value */
   RCAP2H=0xFF;             /* reload value, 115200 Bds at11.059MHz */
   RCAP2L=0xFD;            /* reload value, 115200 Bds at 11.059MHz */
    ES = 1;                              /* Enable serial interrupt */
    EA = 1;                             /* Enable global interrupt */
   TR2 = 1;                     /* Timer 2 run */

   while(1);                    /* endless */
}

void serial_IT(void) interrupt 4
{

    if (RI == 1)
    {                                 /* if reception occur */
      RI = 0;                        /* clear reception flag for next reception */
      uart_data = SBUF;          /* Read receive data */
      SBUF = uart_data;             /* Send back same data on uart*/
    }
    else TI = 0;                   /* if emission occur */
                                    /* clear emission flag for next emission*/
}