yychen的专栏

#include "reg51.h"#define FOSC 12000000L //晶振12M#define BAUD 9600#define NONE_PARITY 0 //无校验位#define ODD_PARITY 1 //奇校验#define EVEN_PARITY 2 //偶校验#define MARK_PARITY 3 //标记校验#define SPACE_PARITY 4 //空校验#define PARITYBIT EVEN_PARITY#define S2RI 0x01#define S2TI 0x02#define S2RB8 0x04#define S2TB8 0x08sfr AUXR = 0x8e;sfr S2CON = 0x9a;sfr S2BUF = 0x9b;sfr BRT = 0x9c;sfr IE2 = 0xaf;bit busy;void SendData(char dat);void SendString(char *s);unsigned char string[]={"hello world!\r\n"};void main(){#if (PARITYBIT == NONE_PARITY) S2CON = 0x5a; //8位可变波特率 (无校验位)#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY) S2CON = 0xda; //9位可变波特率,校验位初始为1#elif (PARITYBIT == SPACE_PARITY) S2CON = 0xd5; //9位可变波特率,校验位初始为0#endif//－－－－串口1初始化—————————— SCON=0x40; //设置串口方式1，，REN=0; PCON=0x80; //波特率加倍 TMOD=0x20; //定时器工作于方式2 TH1=0xf3; //波特率4800 TR1=1; //开启定时器1 //—————串口2初始化－－－－－－－－－－－－－ BRT = -(FOSC/32/BAUD); //设置独立波特率发生器的重载初值 AUXR = 0x14; //独立波特率发生器工作在1T模式 IE2 = 0x01; //使能串口2中断 EA = 1; //开总中断 SendString("STC12C5A60S2\r\nUart2 Test !\r\n"); //串口2发送 while(1) { unsigned char i=0; while(string[i]) //等待字符串发完//串口1发送 { SBUF= string[i++]; //数据装入缓冲区 while(TI==0); //等待发送完 TI=0; //清除发送标志位 } } while(1);}void Uart2() interrupt 8 using 1{ if (S2CON & S2RI) { S2CON &= ~S2RI; //清除接收完成标志 P0 = S2BUF; //P0显示串口数据 P2 = (S2CON & S2RB8); //P2.2显示校验位 } if (S2CON & S2TI) { S2CON &= ~S2TI; //清除发送完成标志 busy = 0; }}void SendData(char dat){ while (busy); //等待上个数据发送完成 ACC = dat; //取得偶校验位P if (P)//根据P来设置串口数据的校验位 {#if (PARITYBIT == ODD_PARITY) S2CON &= ~S2TB8; //置校验位为0#elif (PARITYBIT == EVEN_PARITY) S2CON |= S2TB8; //置校验位为1#endif } else {#if (PARITYBIT == ODD_PARITY) S2CON |= S2TB8; //置校验位为1#elif (PARITYBIT == EVEN_PARITY) S2CON &= ~S2TB8; //置校验位为0#endif } busy = 1; S2BUF = ACC; //发送数据}void SendString(char *s){ while (*s) //判断字符串结束标志 { SendData(*s++); //发送字符 }}

却坐在不足一平米的椅子上。