STC15F2K60S2單片機串口2用定時器2做波特率發(fā)生器的問題

ID:911776 · 發(fā)表于 2021-5-26 14:25

本帖最后由 yhy08090 于 2021-5-31 16:56 編輯

STC15F2K60S2串口2用定時器2做波特率發(fā)生器的問題：
1. STC15F2K60S2串口2用定時器2做波特率發(fā)生器
2. 用STC-ISP工具里面提供的例程
結(jié)果：通過PC端的串口助手發(fā)送數(shù)據(jù)，沒有應(yīng)答；重啟就會收到0x00

求大神幫忙解惑，代碼如下，源于例程，基本沒有更改過
/* 如果要在文章中應(yīng)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(fā)環(huán)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(tǒng)頻率
#define BAUD 9600          //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(biāo)記校驗
#define SPACE_PARITY 4    //空白校驗

#define PARITYBIT NONE_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(shù)據(jù)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(shè)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(shè)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(wù)程序
-----------------------------*/
BYTE tempData;

void Uart2() interrupt 8
{
if (S2CON & S2RI)
{
      S2CON &= ~S2RI;       //清除S2RI位
      P0 = S2BUF;          //P0顯示串口數(shù)據(jù)
      S2BUF = P0;

      P2 = (S2CON & S2RB8); //P2.2顯示校驗位

}
if (S2CON & S2TI)
{
      S2CON &= ~S2TI;       //清除S2TI位
      busy = 0;             //清忙標(biāo)志
}
}

/*----------------------------
發(fā)送串口數(shù)據(jù)
----------------------------*/
void SendData(BYTE dat)
{
while (busy);             //等待前面的數(shù)據(jù)發(fā)送完成
ACC = dat;                //獲取校驗位P (PSW.0)
if (P)                   //根據(jù)P來設(shè)置校驗位
{
#if (PARITYBIT == ODD_PARITY)
      S2CON &= ~S2TB8;       //設(shè)置校驗位為0
#elif (PARITYBIT == EVEN_PARITY)
      S2CON |= S2TB8;       //設(shè)置校驗位為1
#endif
}
else
{
#if (PARITYBIT == ODD_PARITY)
      S2CON |= S2TB8;       //設(shè)置校驗位為1
#elif (PARITYBIT == EVEN_PARITY)
      S2CON &= ~S2TB8;       //設(shè)置校驗位為0
#endif
}
busy = 1;
S2BUF = ACC;             //寫數(shù)據(jù)到UART2數(shù)據(jù)寄存器
}

/*----------------------------
發(fā)送字符串
----------------------------*/
void SendString(char *s)
{
while (*s)                //檢測字符串結(jié)束標(biāo)志
{
      SendData(*s++);       //發(fā)送當(dāng)前字符
}
}