最近做项目用到STC单片机，型号是IAP15W4K58S4，在做串口通信时发现每次我发送指令给单片机以后，单片机确实执行了，但是会返回我发送的指令，然后在STC-ISP烧录程序的“范例程序”中找到串口通信例程直接烧录自带的HEX程序同样存在这样的问题，求解。官方的例程是这样的，用串口助手测试，我发个数据给单片机，单片机会返回我发的数据：
/*---------------------------------------------------------------------*/
/* --- STC MCU Limited ------------------------------------------------*/
/* --- STC15F4K60S4 系列 定时器2用作串口2的波特率发生器举例------------*/
/* --- Mobile: (86)13922805190 ----------------------------------------*/
/* --- Fax: 86-0513-55012956,55012947,55012969 ------------------------*/
/* --- Tel: 86-0513-55012928,55012929,55012966-------------------------*/
/* 如果要在程序中使用此代码,请在程序中注明使用了STC的资料及程序 */
/* 如果要在文章中应用此代码,请在文章中注明使用了STC的资料及程序 */
/*---------------------------------------------------------------------*/
//本示例在Keil开发环境下请选择Intel的8058芯片型号进行编译
//若无特别说明,工作频率一般为11.0592MHz
#include "reg51.h"
#include "intrins.h"
typedef unsigned char BYTE;
typedef unsigned int WORD;
#define FOSC 11059200L //系统频率
#define BAUD 115200 //串口波特率
#define NONE_PARITY 0 //无校验
#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 //空白校验
#define PARITYBIT EVEN_PARITY //定义校验位
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xC9;
sfr P5M0 = 0xCA;
sfr P6M1 = 0xCB;
sfr P6M0 = 0xCC;
sfr P7M1 = 0xE1;
sfr P7M0 = 0xE2;
sfr AUXR = 0x8e; //辅助寄存器
sfr S2CON = 0x9a; //UART2 控制寄存器
sfr S2BUF = 0x9b; //UART2 数据寄存器
sfr T2H = 0xd6; //定时器2高8位
sfr T2L = 0xd7; //定时器2低8位
sfr IE2 = 0xaf; //中断控制寄存器2
#define S2RI 0x01 //S2CON.0
#define S2TI 0x02 //S2CON.1
#define S2RB8 0x04 //S2CON.2
#define S2TB8 0x08 //S2CON.3
sfr P_SW2 = 0xBA; //外设功能切换寄存器2
#define S2_S0 0x01 //P_SW2.0
bit busy;
void SendData(BYTE dat);
void SendString(char *s);
void main()
{
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
P6M0 = 0x00;
P6M1 = 0x00;
P7M0 = 0x00;
P7M1 = 0x00;
P_SW2 &= ~S2_S0; //S2_S0=0 (P1.0/RxD2, P1.1/TxD2)
// P_SW2 |= S2_S0; //S2_S0=1 (P4.6/RxD2_2, P4.7/TxD2_2)
#if (PARITYBIT == NONE_PARITY)
S2CON = 0x50; //8位可变波特率
#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 = 0xd2; //9位可变波特率,校验位初始为0
#endif
T2L = (65536 - (FOSC/4/BAUD)); //设置波特率重装值
T2H = (65536 - (FOSC/4/BAUD))>>8;
AUXR = 0x14; //T2为1T模式, 并启动定时器2
IE2 = 0x01; //使能串口2中断
EA = 1;
SendString("STC15F2K60S2\r\nUart2 Test !\r\n");
while(1);
}
/*----------------------------
UART2 中断服务程序
-----------------------------*/
void Uart2() interrupt 8 using 1
{
if (S2CON & S2RI)
{
S2CON &= ~S2RI; //清除S2RI位
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S2TI位
busy = 0; //清忙标志
}
}
/*----------------------------
发送串口数据
----------------------------*/
void SendData(BYTE dat)
{
while (busy); //等待前面的数据发送完成
ACC = dat; //获取校验位P (PSW.0)
if (P) //根据P来设置校验位
{
#if (PARITYBIT == ODD_PARITY)
S2CON &= ~S2TB8; //设置校验位为0
#elif (PARITYBIT == EVEN_PARITY)
S2CON |= S2TB8; //设置校验位为1
#endif
}
else
{
#if (PARITYBIT == ODD_PARITY)
S2CON |= S2TB8; //设置校验位为1
#elif (PARITYBIT == EVEN_PARITY)
S2CON &= ~S2TB8; //设置校验位为0
#endif
}
busy = 1;
S2BUF = ACC; //写数据到UART2数据寄存器
}
/*----------------------------
发送字符串
----------------------------*/
void SendString(char *s)
{
while (*s) //检测字符串结束标志
{
SendData(*s++); //发送当前字符
}
}
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