最近做項目用到STC單片機，型號是IAP15W4K58S4，在做串口通信時發現每次我發送指令給單片機以后，單片機確實執行了，但是會返回我發送的指令，然后在STC-ISP燒錄程序的“范例程序”中找到串口通信例程直接燒錄自帶的HEX程序同樣存在這樣的問題，求解。官方的例程是這樣的，用串口助手測試，我發個數據給單片機，單片機會返回我發的數據：
/*---------------------------------------------------------------------*/
/* --- STC MCU Limited ------------------------------------------------*/
/* --- STC15F4K60S4 系列 定時器2用作串口2的波特率發生器舉例------------*/
/* --- 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碼,請在程序中注明使用了STC的資料及程序 */
/* 如果要在文章中應用此代碼,請在文章中注明使用了STC的資料及程序 */
/*---------------------------------------------------------------------*/
//本示例在Keil開發環境下請選擇Intel的8058芯片型號進行編譯
//若無特別說明,工作頻率一般為11.0592MHz
#include "reg51.h"
#include "intrins.h"
typedef unsigned char BYTE;
typedef unsigned int WORD;
#define FOSC 11059200L //系統頻率
#define BAUD 115200 //串口波特率
#define NONE_PARITY 0 //無校驗
#define ODD_PARITY 1 //奇校驗
#define EVEN_PARITY 2 //偶校驗
#define MARK_PARITY 3 //標記校驗
#define SPACE_PARITY 4 //空白校驗
#define PARITYBIT EVEN_PARITY //定義校驗位
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; //輔助寄存器
sfr S2CON = 0x9a; //UART2 控制寄存器
sfr S2BUF = 0x9b; //UART2 數據寄存器
sfr T2H = 0xd6; //定時器2高8位
sfr T2L = 0xd7; //定時器2低8位
sfr IE2 = 0xaf; //中斷控制寄存器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; //外設功能切換寄存器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位可變波特率
#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
S2CON = 0xda; //9位可變波特率,校驗位初始為1
#elif (PARITYBIT == SPACE_PARITY)
S2CON = 0xd2; //9位可變波特率,校驗位初始為0
#endif
T2L = (65536 - (FOSC/4/BAUD)); //設置波特率重裝值
T2H = (65536 - (FOSC/4/BAUD))>>8;
AUXR = 0x14; //T2為1T模式, 并啟動定時器2
IE2 = 0x01; //使能串口2中斷
EA = 1;
SendString("STC15F2K60S2\r\nUart2 Test !\r\n");
while(1);
}
/*----------------------------
UART2 中斷服務程序
-----------------------------*/
void Uart2() interrupt 8 using 1
{
if (S2CON & S2RI)
{
S2CON &= ~S2RI; //清除S2RI位
P0 = S2BUF; //P0顯示串口數據
P2 = (S2CON & S2RB8); //P2.2顯示校驗位
}
if (S2CON & S2TI)
{
S2CON &= ~S2TI; //清除S2TI位
busy = 0; //清忙標志
}
}
/*----------------------------
發送串口數據
----------------------------*/
void SendData(BYTE dat)
{
while (busy); //等待前面的數據發送完成
ACC = dat; //獲取校驗位P (PSW.0)
if (P) //根據P來設置校驗位
{
#if (PARITYBIT == ODD_PARITY)
S2CON &= ~S2TB8; //設置校驗位為0
#elif (PARITYBIT == EVEN_PARITY)
S2CON |= S2TB8; //設置校驗位為1
#endif
}
else
{
#if (PARITYBIT == ODD_PARITY)
S2CON |= S2TB8; //設置校驗位為1
#elif (PARITYBIT == EVEN_PARITY)
S2CON &= ~S2TB8; //設置校驗位為0
#endif
}
busy = 1;
S2BUF = ACC; //寫數據到UART2數據寄存器
}
/*----------------------------
發送字符串
----------------------------*/
void SendString(char *s)
{
while (*s) //檢測字符串結束標志
{
SendData(*s++); //發送當前字符
}
}
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