蓝桥杯单片机必备知识-----(12)串口通讯
串口初始化函数
//主程序中调用
void UartInit(void) //[email protected]
{
SCON = 0x50; //8位数据,可变波特率
AUXR |= 0x01; //串口1选择定时器2为波特率发生器
AUXR &= 0xFB; //定时器2时钟为Fosc/12,即12T
T2L = 0xE8; //设定定时初值
T2H = 0xFF; //设定定时初值
AUXR |= 0x10; //启动定时器2
}
发送字符串
void sendstring(unsigned char *str)//发送字符串
{
while(*str !='\0')//等待\0
{
//sendbyte(*str++);//发送下一个字符
SBUF=*str++; //将数据放进SBUF缓冲器
while(TI==0); //等待发送数据完成
TI=0; //清除发送完成标志
}
}
串口中断
void s() interrupt 4
{
if(RI)
{
str1[scount++]=SBUF; RI=1时接收数据，将数据放入SBUF
RI = 0;
}
}
整个代码粘贴
#include <stc15f2k60s2.h>
#include <stdio.h>
#define uchar unsigned char
#define uint unsigned int
uchar tab[] = {
0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff};
uchar dspbuf[] = {
10,10,10,10,10,10,10,10};
uchar temperature = 12;
unsigned char str1[20];
unsigned char scount = 0;
unsigned char str[20];
void load();
void sendstring(unsigned char *str);
void sendbyte(unsigned char dat);
void display();
void uart_proc();
void cls()
{
P2 = (P2 & 0x1f) | 0x80;
P0 = 0xff;
P2 = 0x1f;
P2 = (P2 & 0x1f) | 0xa0;
P0 = 0x00;
P2 = 0x1f;
}
void UartInit(void) //[email protected]
{
SCON = 0x50; //8位数据,可变波特率
AUXR |= 0x01; //串口1选择定时器2为波特率发生器
AUXR &= 0xFB; //定时器2时钟为Fosc/12,即12T
T2L = 0xE8; //设定定时初值
T2H = 0xFF; //设定定时初值
AUXR |= 0x10; //启动定时器2
}
void main()
{
cls();
AUXR = 0xc0;
TMOD = 0x00;
TL0 = 0xcd;
TH0 = 0xd4;
TR0 = 1;
ET1 = 1;
ES = 1;
EA = 1;
UartInit();
while(1)
{
uart_proc();
}
}
void s() interrupt 4
{
if(RI)
{
str1[scount++]=SBUF;
RI = 0;
}
}
void uart_proc()
{
if(scount > 0)
{
//sendstring(str1);
if(str1[scount-1] == 0xa)
{
sendstring(str1);
if((str1[0] =='s') && (str1[1] == 0xd))
{
sprintf(str,"#temperature:%02u\r\n",(uint)(temperature));//发送Hello
sendstring(str);
}
scount = 0;
}
else
if(scount==6)
{
sendstring(str1);
scount = 0;
}
}
}
void sendstring(unsigned char *str)//发送字符串
{
while(*str !='\0')//等待\0
{
//sendbyte(*str++);//发送下一个字符
SBUF=*str++; //将数据放进SBUF缓冲器
while(TI==0); //等待发送数据完成
TI=0; //清除发送完成标志
}
}