单片机CT107D"/>
蓝桥杯单片机CT107D
#include<reg52.h>
sfr AUXR = 0x8e; //设置辅助寄存器AUXR
unsigned char command; //用于接收上位机数据 void Select_HC138(unsigned char n)
{switch(n){case 4:P2 = (P2 & 0x1f) | 0x80;break;case 5:P2 = (P2 & 0x1f) | 0xa0;break;}
}void Send_byte(unsigned char dat) //发送一个字节
{SBUF = dat;while(TI == 0); //等待发送TI = 0; //清0
}void Send_string(unsigned char *str) //发送一个字符串
{while(*str != '\0'){Send_byte(*str++);}
}void LED_bright()
{if(command) {switch(command & 0xf0) //保留command的高4位,低4位清0{case 0xa0: //控制L1~L4P0 = (P0 & 0xf0) | (~command & 0x0f); //P0 = (P0 | 0x0f) & (~command | 0xf0); //保留P0的高4四位,取~command的低4位,然后组合break;case 0xb0: //控制L5~L8P0 = (P0 | 0xf0) & ((~command << 4) | 0x0f); //保留P0的低4位,取~command右移4位后的高4位,然后组合break;case 0xc0: //输出字符串Send_string("The system is running...\r\n");break;}}command = 0;
}void Init_uart() //串口初始化
{SCON = 0x50; //8位异步uart并允许接收AUXR = 0x00; //将AUXR置0TMOD = 0x20; //8位自动重装定时器(产生9600b/s波特率)TH1 = 0xfd;TL0 = 0xfd;TR1 = 1; //打开定时器1EA = 1; //打开总中断ES = 1; //打卡串口中断
}void Service_uart() interrupt 4 //串口中断服务函数
{if(RI == 1) //接收数据{RI = 0; //清0command = SBUF;LED_bright();}
}void main()
{Init_uart();Select_HC138(5);P0 = 0x00; //关闭蜂鸣器和继电器Select_HC138(4);P0 = 0xff;//Send_string("Welcom to x system!\r\n"); //在Windows下的串口助手要显示换行,需在字符串后加\r\n while(1);
}
更多推荐
蓝桥杯单片机CT107D
发布评论