STC MCU dual serial port usage settings and routines-EEWORLD

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When using the STC_60s2 microcontroller to transmit and receive dual serial ports simultaneously, pay attention to some places where configuration errors are easy to occur. The AUXR register has many functions. When setting and resetting a bit, it is likely to be done multiple times in different places. You should use the AUXR |= bitx and AUXR &=~bitx statements to set and reset a certain bit. This will not affect other function bits.

Attached program:

#include

//sfr AUXR = 0x8E;

#define uchar unsigned char //

#define uint unsigned int //

#define BUADRATE 38400

#define FOSC 24000000

#define S2RI 0x01

#define S2TI 0x02

sbit LED1 = P2^7;

uchar ReceBuf[200]={0};

bit finishflag = 0;

uchar revcnt = 0;

uchar startflag = 0;

void InitUART1(void) //baudrate 115200

{

TMOD = 0x20;

SCON = 0x50;

TH1 = 0xf3; //115384

TL1 = TH1;

PCON = 0x80; //SMOD = 1;

ES = 1;

TR1 = 1;

}

void InitUART2() //baudrate 38400

{

S2CON = 0x50; //8-Bit serial port mode allows receiving

BRT = 236; //[24000000/(256-236)]/32 = 37500 error2.34%

AUXR |= 0x14; //BRTR=1 enables BRT BRTx12=1 does not divide the frequency (AUXR appears for the second time, cannot use '=' should use "|=")

IE2 = 0x01; //enable UART2 interrupt

AUXR1 = 0; //UART2 TXD->P1.3 RXD->P1.2

}

void SendOneByte(unsigned char c)

{

SBUF = c;

while(!TI);

TI = 0;

}

void U1SendString(uchar *dat)

{

while(*(dat)!='\0')

{

SendOneByte(*dat);

dat ;

}

void U2SendOneByte(unsigned char c)

{

S2BUF = c;

while(!(S2CON & S2TI));

S2CON &= ~S2TI;

}

void U2SendString(uchar *dat)

{

while(*(dat)!='\0')

{

U2SendOneByte(*dat);

dat ;

}

void main()

{ uchar temp = 0x01;

AUXR = AUXR|0x40; // T1, 1T Mode AUXR appears for the first time

InitUART1();

EA = 1;

SendOneByte(0xaa);

SendOneByte(0xbb);

SendOneByte(0xcc);

InitUART2();

SendOneByte(0xdd);

while(1)

{// temp = ~temp;

// U2SendOneByte(temp);

if(finishflag)

{ LED1 = 1;

finishflag = 0;

U1SendString(ReceBuf);

LED1 = 0;

}

void UART1ISR(void) interrupt 4

{

if(RI)

{

RI = 0;

//add your code here!

}

else

TI = 0;

}

void UART2ISR(void) interrupt 8

{ static bit flash=0;

static uchar i=0;

static uchar endcnt = 0;

uchar tempdat = 0;

if(S2CON & S2RI)

{

S2CON &= ~S2RI;

if(~finishflag)

{

flash=~flash;

//LED1 = flash;

tempdat = S2BUF;

if(tempdate=='$')

{

startflag = 1;

}

///////////////////////////////////////////////////// //////////

if(startflag)

{

ReceBuf[i] = tempdat;

i ;

///////////////////////////////////////////////////// //////////

if(i==6&&ReceBuf[3]!='R'&&ReceBuf[5]!='C') //Judge whether it is a $GPRMC frame

{

startflag = 0;

i = 0;

}

else if(ReceBuf[i-1]=='*')

{

endcnt ;

if(endcnt==2)

{

revcnt = i;

endcnt = 0;

i = 0;

finishflag = 1;

startflag = 0;

}

else ;

}

else ;

}

else

S2CON &= ~S2TI;

}

Reference address：STC MCU dual serial port usage settings and routines

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