请高手指教串口问题，谢谢。 -

标题: 请高手指教串口问题，谢谢。 [打印本页]

作者: yyg123321a 时间: 2016-5-14 12:26
标题: 请高手指教串口问题，谢谢。
SC12C5A60S2单片机，KEIL 4运行串口2程序，无法进入中断，串口1则可正常进入中断，不知何解。程序是正确的（是范例），包括从网上下载的多个串口2程序一样是无法进入中断服务程序，已困扰多日，请高手指点，谢谢。

作者: 狂奔的菜鸟 时间: 2016-5-14 21:15
程序发上来看看

作者: yyg123321a 时间: 2016-5-15 09:59
烦请帮忙测试，谢谢。

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
   }
}

作者: yyg123321a 时间: 2016-5-15 13:13
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
   }
}

作者: 狂奔的菜鸟 时间: 2016-5-15 15:44
你换SC12C5A60S2的头文件试试呢？

作者: yyg123321a 时间: 2016-5-15 21:55
已换STC12C5A60S2头文件还是一样串口2进入不了中断服务程序，清不了“busy”忙标志，程序进入while(busy);死循环，不知何解，能否帮忙测一下串口2程序能否正常运行，从串口2窗中观察到输出的字符串，谢谢。

作者: yyg123321a 时间: 2016-5-16 15:07
一周都无人解答，花1分钟帮忙测试都不愿意，真失望。

作者: 亘黑鹿 时间: 2016-5-16 16:44
耐心等待吧！会有大神出现的！这个应该很难吧！
这论坛资料挺多的我还考虑开会员现在........

作者: yyg123321a 时间: 2016-5-16 17:02
亘黑鹿你好，能否帮忙测试一下程序2是否正常运行，输出字符串STC12C5A60S2\r\nUart Test !，谢谢。

作者: 亘黑鹿 时间: 2016-5-16 20:23

yyg123321a 发表于 2016-5-16 17:02
亘黑鹿你好，能否帮忙测试一下程序2是否正常运行，输出字符串STC12C5A60S2\r\nUart Test !，谢谢。

我帮测？太看得起我了！我刚学不久的你写哪些太高级呀！要我咋帮你！

作者: 亘黑鹿 时间: 2016-5-16 20:26

yyg123321a 发表于 2016-5-16 17:02
亘黑鹿你好，能否帮忙测试一下程序2是否正常运行，输出字符串STC12C5A60S2\r\nUart Test !，谢谢。

我有keil软件呀！你是想我帮你运行程序有没有错误提示？？？

作者: 亘黑鹿 时间: 2016-5-16 20:31

yyg123321a 发表于 2016-5-16 17:02
亘黑鹿你好，能否帮忙测试一下程序2是否正常运行，输出字符串STC12C5A60S2\r\nUart Test !，谢谢。

我用keil测了程序吾错误无警告！

作者: baofu 时间: 2016-5-16 21:14
本帖最后由 baofu 于 2016-5-16 21:35 编辑

我编译链接中没有发现问题，但在debug中确实发现你所说的情况。但这也不能证明程序就有问题，只有实际运行才能确定，所以建议你搭建实际电路验证。并且建议初学者不要在模拟调试上花费很多时间，因为有些东西即使模拟调试成功，到了真实环境中也不一定就好用，结果也仅仅是参考性的，特别像这种含有中断的程序，模拟调试与实际情况相去甚远。
还有一种情况，STC单片机在Keilc的型号数据库中没有被收录，都是借用相近型号，然后在程序中自定义特殊功能寄存器。这就造成两者不相符合。我没有实际验证，仅仅是猜测，供你参考。

作者: yyg123321a 时间: 2016-5-16 22:36
谢谢两位朋友回复，我也是下载了多个串口2的程序，编译链接都无错误，调试时都出现死循环（程序应是正确的，不可能都有错吧）。折腾多天也没头绪，一般我是先调试好软件再弄硬件的，再次谢谢baofu，我弄个硬件验证。

作者: yyg123321a 时间: 2016-5-20 09:42
问题已解决，在最少系统运行串口2程序，可以通过串口助手观察到输出的字符串，非常感谢baofu。
但是还有点遗憾，不能DEBUG了，第一次用STC单片机，感觉其兼容性不佳，不能很好适应KEIL。还有STC公司做事不严紧，其官方发布的PDF资料和STC-ISP头文件关于中断优先级有误，一个写IPH2，另一个写IP2H，致电STC公司，其客服人员回复查证后更改。这说明STC公司对其发行的软件根本未做测试，否则不可能发生如此低级错误，也没有任何提示性信息，对于一间技术性公司来说是很不负责任的。

欢迎光临 (http://www.51hei.com/bbs/)