最近做项目用需要用到两个串口，分别是串口1和串口2，
串口1接调试，传感器等，串口2对接蓝牙与APP通讯
芯片型号：STC8H3K64S4
#include "stc8h.h"
#define S2RI 0x01 //串口2接收中断请求标志位
#define S2TI 0x02 //串口2发送中断请求标志位
char flag = 0;
unsigned char UART2_ReceiveBuffer[10]={0};
void Uart2_Init(void) //9600bps@22.1184MHz
{
S2CON = 0x50; //8位数据,可变波特率
AUXR |= 0x04; //定时器2时钟为Fosc,即1T
T2L = 0xC0; //设定定时初值
T2H = 0xFD; //设定定时初值
AUXR |= 0x10; //启动定时器2
EA = 1;
IE2 = 0X01; //打开接收中断
}
void UART2_SendByte(unsigned char mydata)
{
IE2 = 0X00;
S2CON&=~S2TI; //TI = 1
S2BUF=mydata;
while((S2CON&S2TI)==0);
S2CON&=~S2TI; //TI = 1//清除发送标志位
IE2 = 0X01;
}
void Uart2_SendString(unsigned char *p) //串口2发送一个字符串
{
while(*p!='\0')
{
UART2_SendByte(*p);
p++;
}
}
void Uart2_InterruptService(void) interrupt 8
{
unsigned char temp;
static char i = 0;
if(S2CON&S2RI) //RI == 0
{
flag = 1;
S2CON&=~S2RI; //RI = 1
temp = S2BUF;
UART2_ReceiveBuffer[i] = temp;
if(i == 10)
{
i=0;
}else{
i++;
}
}
}
void main()
{
Uart2_Init();
Uart2_SendString("start\n");
while(1)
{
if(flag == 1)
{
IE2 &= ~S2RI;
S2BUF = temp;
while(!(S2CON&S2TI));
S2CON&=~S2TI;
IE2 |= S2RI;
flag = 0;
}
}
}
注意：
在用STC_60s2单片机进行双串口同时收发时，要注意一些容易配置错误的地方。
AUXR寄存器有很多功能。
在对其中的位置位和复位时，很可能在不同的地方多次进行，应该使用 AUXR |= bitx 和 AUXR &=~bitx 语句进行对某一位的置位和复位。
这样就不会影响其他功能位了。
附上程序：
#include <STC12C5A60S2.h>
//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 串口模式 允许接收
BRT = 236; //[24000000/(256-236)]/32 = 37500 error2.34%
AUXR |= 0x14; //BRTR=1使能BRT BRTx12=1 不分频 （AUXR 第二次出现，不能用‘=’应该用“|=”）
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 第一次出现
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;
}
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(tempdat=='$')
{
startflag = 1;
}
if(startflag)
{
ReceBuf[i] = tempdat;
i ;
if(i==6&&ReceBuf[3]!='R'&&ReceBuf[5]!='C') //判断是不是$GPRMC帧
{
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;
}