stc89c52單片機串口通信如何用定時器2，請大俠指教一二

ID:420214 · 發(fā)表于 2019-1-10 18:01

采用定時器1時，單片機程序可以進行通信。改用定時器2時，就不行了。請大俠指教一二！！！

      uchar i;

//       TMOD = 0x20;//設置定時器1位工作方式2  ，8位自動重裝載
//       TH1 = 0xfd;       //裝入初值
//       TL1 = 0xfd;
//       TR1 = 1;
// 用以上定時器1是可以的

      T2CON = 0x30; //TF2 EXF2 RCLK = 1;TCLK = 1;       EXEN2 TR2; C/T2 CP/RL2

      RCAP2H =  (65536-main_fosc/ (32 * baudmy)) / 256 ;
      RCAP2L =  (65536-main_fosc/ (32 * baudmy)) % 256 ;
      TH2 = RCAP2H;
      TL2 = RCAP2L;
      T2MOD =0x00;
      TR2 =1;          //啟動定時器2
//用定時器2，按上述設置，就不行了

//SCON SM0 SM1 SM2 REN TB8 RB8 TI RI
      SM0 = 0;
      SM1 = 1;
      REN = 1;
      ES = 1;
      EA = 1;

ID:155507 · 發(fā)表于 2019-1-10 20:15

我給你來個程序試試

/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC89-90xx Series MCU UART (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"
sfr T2CON = 0xC8; //timer2 control register
sfr RCAP2L = 0xCA;
sfr RCAP2H = 0xCB;
sfr TL2 = 0xCC;
sfr TH2 = 0xCD;
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
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
TL2 = RCAP2L = (65536-(FOSC/32/BAUD)); //Set auto-reload vaule
TH2 = RCAP2H = (65536-(FOSC/32/BAUD)) >> 8;
T2CON = 0x34; //Timer2 start run
ES = 1; //Enable UART interrupt
EA = 1; //Open master interrupt switch
SendString("STC89-90xx\r\nUart Test !\r\n");
while(1);
}
/*----------------------------
UART interrupt service routine
----------------------------*/
void Uart_Isr() interrupt 4
{
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
}
}

復制代碼

ID:458411 · 發(fā)表于 2019-1-10 20:27

/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC89-90xx Series MCU UART (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"

sfr T2CON  = 0xC8;       //timer2 control register
sfr RCAP2L = 0xCA;
sfr RCAP2H = 0xCB;
sfr TL2 = 0xCC;
sfr TH2 = 0xCD;

typedef unsigned char BYTE;
typedef unsigned int WORD;
unsigned char num;
#define FOSC 11059200L    //System frequency
#define BAUD 9600    //UART baudrate
bit busy;
void main()
{
SCON = 0x50;          //8-bit variable UART
TL2 = RCAP2L = (65536-(FOSC/32/BAUD)); //Set auto-reload vaule
TH2 = RCAP2H = (65536-(FOSC/32/BAUD)) >> 8;
T2CON = 0x34;          //Timer2 start run
ES = 1;                //Enable UART interrupt
EA = 1;                //Open master interrupt switch
SendString("66666 !\r\n");
while(1);
}

void Uart_Isr() interrupt 4 using 1
{
if (RI)
{
num = SBUF;    //num è¡3ö½óêÕ»o′æÆ÷μÄÖμ
RI = 0;
SBUF = num;
}
if (TI)
{
      TI = 0;          //Clear transmit interrupt flag
      busy = 0;          //Clear transmit busy flag
}
}

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)
busy = 1;
SBUF = ACC;          //Send data to UART buffer
}
void SendString(char *s)
{
while (*s)             //Check the end of the string
{
      SendData(*s++);    //Send current char and increment string ptr
}
}

ID:213173 · 發(fā)表于 2019-1-10 20:33

ID:420214 · 發(fā)表于 2019-1-10 21:55

angmall 發(fā)表于 2019-1-10 20:15
我給你來個程序試試

謝謝！！
我試了一下，還不太好。我好好學習一下先。
多謝了！！

ID:420214 · 發(fā)表于 2019-1-10 21:57

xiaob123 發(fā)表于 2019-1-10 20:27
/*------------------------------------------------------------------*/
/* --- STC MCU Limited ----- ...

嗯，可以運行了！
感謝！！
我好好研究一下，是啥原因。

ID:420214 · 發(fā)表于 2019-1-10 22:00

wulin 發(fā)表于 2019-1-10 20:33

找到這個了，再次感謝！！

ID:420214 · 發(fā)表于 2019-1-10 22:02

解決了，謝謝兩位。
原因在查。

ID:607652 · 發(fā)表于 2019-9-17 11:09

樓主。你是什么問題a?

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stc89c52單片機串口通信如何用定時器2，請大俠指教一二