请各位朋友帮忙测试一下串口程序，谢谢。

ID:119239 · 发表于 2016-5-10 23:21

   我的串口2程序调不通（用STC12C5A60S2），怀疑是我的Keil  C，版本为UV4设置可能有问题。测试STC-ISP串口范例程序，串口1范例可正常执行，输出了字符串，串口2范例没有字符串输出，进入了死循环，不知何解？请朋友帮忙测试一下，究竟是何原因。

程序一：串口1例程（从STC-ISP烧写软件的范例中复制）
/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC12C5Axx Series MCU UART (8-bit/9-bit)Demo ----------------*/
/* --- Mobile: (86)13922805190 -------------------------------------*/
/* --- Fax: 86-0513-55012956,55012947,55012969 ---------------------*/
/* --- Tel: 86-0513-55012928,55012929,55012966----------------------*/
/* If you want to use the program or the program referenced in the  */
/* article, please specify in which data and procedures from STC */
/*------------------------------------------------------------------*/
#include "reg51.h"
#include "intrins.h"
typedef unsigned char BYTE;
typedef unsigned int WORD;
#define FOSC 11059200L    //System frequency
#define BAUD 9600          //UART baudrate
/*Define UART parity mode*/
#define NONE_PARITY    0 //None parity
#define ODD_PARITY    1 //Odd parity
#define EVEN_PARITY    2 //Even parity
#define MARK_PARITY    3 //Mark parity
#define SPACE_PARITY 4 //Space parity
#define PARITYBIT EVEN_PARITY //Testing even parity
sbit bit9 = P2^2;          //P2.2 show UART data bit9
bit busy;
void SendData(BYTE dat);
void SendString(char *s);
void main()
{
#if (PARITYBIT == NONE_PARITY)
SCON = 0x50;          //8-bit variable UART
#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
SCON = 0xda;          //9-bit variable UART, parity bit initial to 1
#elif (PARITYBIT == SPACE_PARITY)
SCON = 0xd2;          //9-bit variable UART, parity bit initial to 0
#endif
TMOD = 0x20;          //Set Timer1 as 8-bit auto reload mode
TH1 = TL1 = -(FOSC/12/32/BAUD); //Set auto-reload vaule
TR1 = 1;             //Timer1 start run
ES = 1;                //Enable UART interrupt
EA = 1;                //Open master interrupt switch
SendString("STC12C5A60S2\r\nUart Test !\r\n");
while(1);
}
/*----------------------------
UART interrupt service routine
----------------------------*/
void Uart_Isr() interrupt 4 using 1
{
if (RI)
{
      RI = 0;          //Clear receive interrupt flag
      P0 = SBUF;       //P0 show UART data
      bit9 = RB8;       //P2.2 show parity bit
}
if (TI)
{
      TI = 0;          //Clear transmit interrupt flag
      busy = 0;          //Clear transmit busy flag
}
}
/*----------------------------
Send a byte data to UART
Input: dat (data to be sent)
Output:None
----------------------------*/
void SendData(BYTE dat)
{
while (busy);          //Wait for the completion of the previous data is sent
ACC = dat;             //Calculate the even parity bit P (PSW.0)
if (P)                //Set the parity bit according to P
{
#if (PARITYBIT == ODD_PARITY)
      TB8 = 0;          //Set parity bit to 0
#elif (PARITYBIT == EVEN_PARITY)
      TB8 = 1;          //Set parity bit to 1
#endif
}
else
{
#if (PARITYBIT == ODD_PARITY)
      TB8 = 1;          //Set parity bit to 1
#elif (PARITYBIT == EVEN_PARITY)
      TB8 = 0;          //Set parity bit to 0
#endif
}
busy = 1;
SBUF = ACC;          //Send data to UART buffer
}
/*----------------------------
Send a string to UART
Input: s (address of string)
Output:None
----------------------------*/
void SendString(char *s)
{
while (*s)             //Check the end of the string
{
      SendData(*s++);    //Send current char and increment string ptr
}
}

程序二：串口2例程（从STC-ISP烧写软件的范例中复制）
/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC12C5Axx Series MCU UART2 (8-bit/9-bit)Demo ---------------*/
/* --- Mobile: (86)13922805190 -------------------------------------*/
/* --- Fax: 86-0513-55012956,55012947,55012969 ---------------------*/
/* --- Tel: 86-0513-55012928,55012929,55012966----------------------*/
/* --- Web: www.STCMCU.com -----------------------------------------*/
/* --- Web: www.GXWMCU.com -----------------------------------------*/
/* If you want to use the program or the program referenced in the  */
/* article, please specify in which data and procedures from STC */
/*------------------------------------------------------------------*/
#include "reg51.h"
#include "intrins.h"
typedef unsigned char BYTE;
typedef unsigned int WORD;
#define FOSC 11059200L    //System frequency
#define BAUD 115200       //UART baudrate
/*Define UART parity mode*/
#define NONE_PARITY    0 //None parity
#define ODD_PARITY    1 //Odd parity
#define EVEN_PARITY    2 //Even parity
#define MARK_PARITY    3 //Mark parity
#define SPACE_PARITY 4 //Space parity
#define PARITYBIT EVEN_PARITY //Testing even parity
/*Declare SFR associated with the UART2 */
sfr AUXR  = 0x8e;          //Auxiliary register
sfr S2CON = 0x9a;          //UART2 control register
sfr S2BUF = 0x9b;          //UART2 data buffer
sfr BRT = 0x9c;          //Baudrate generator
sfr IE2 = 0xaf;          //Interrupt control 2
#define S2RI  0x01       //S2CON.0
#define S2TI  0x02       //S2CON.1
#define S2RB8 0x04       //S2CON.2
#define S2TB8 0x08       //S2CON.3
bit busy;
void SendData(BYTE dat);
void SendString(char *s);
void main()
{
#if (PARITYBIT == NONE_PARITY)
S2CON = 0x50;          //8-bit variable UART
#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
S2CON = 0xda;          //9-bit variable UART, parity bit initial to 1
#elif (PARITYBIT == SPACE_PARITY)
S2CON = 0xd2;          //9-bit variable UART, parity bit initial to 0
#endif
BRT = -(FOSC/32/BAUD);  //Set auto-reload vaule of baudrate generator
AUXR = 0x14;          //Baudrate generator work in 1T mode
IE2 = 0x01;          //Enable UART2 interrupt
EA = 1;                //Open master interrupt switch
SendString("STC12C5A60S2\r\nUart2 Test !\r\n");
while(1);
}
/*----------------------------
UART2 interrupt service routine
----------------------------*/
void Uart2() interrupt 8 using 1
{
if (S2CON & S2RI)
{
      S2CON &= ~S2RI;    //Clear receive interrupt flag
      P0 = S2BUF;       //P0 show UART data
      P2 = (S2CON & S2RB8);//P2.2 show parity bit
}
if (S2CON & S2TI)
{
      S2CON &= ~S2TI;    //Clear transmit interrupt flag
      busy = 0;          //Clear transmit busy flag
}
}
/*----------------------------
Send a byte data to UART
Input: dat (data to be sent)
Output:None
----------------------------*/
void SendData(BYTE dat)
{
while (busy);          //Wait for the completion of the previous data is sent
ACC = dat;             //Calculate the even parity bit P (PSW.0)
if (P)                //Set the parity bit according to P
{
#if (PARITYBIT == ODD_PARITY)
      S2CON &= ~S2TB8; //Set parity bit to 0
#elif (PARITYBIT == EVEN_PARITY)
      S2CON |= S2TB8;    //Set parity bit to 1
#endif
}
else
{
#if (PARITYBIT == ODD_PARITY)
      S2CON |= S2TB8;    //Set parity bit to 1
#elif (PARITYBIT == EVEN_PARITY)
      S2CON &= ~S2TB8; //Set parity bit to 0
#endif
}
busy = 1;
S2BUF = ACC;          //Send data to UART2 buffer
}
/*----------------------------
Send a string to UART
Input: s (address of string)
Output:None
----------------------------*/
void SendString(char *s)
{
while (*s)             //Check the end of the string
{
      SendData(*s++);    //Send current char and increment string ptr
}
}