本帖最后由 yhy08090 于 2021-5-31 16:56 编辑
STC15F2K60S2串口2用定时器2做波特率发生器的问题：
1. STC15F2K60S2串口2用定时器2做波特率发生器
2. 用STC-ISP工具里面提供的例程
结果：通过PC端的串口助手发送数据，没有应答；重启就会收到0x00
求大神帮忙解惑，代码如下，源于例程，基本没有更改过
/* 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 9600 //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 NONE_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
-----------------------------*/
BYTE tempData;
void Uart2() interrupt 8
{
if (S2CON & S2RI)
{
S2CON &= ~S2RI; //清除S2RI位
P0 = S2BUF; //P0显示串口数据
S2BUF = P0;
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
}
}
|
