#include<reg51.h>
#include<string.h>
#include "LCD1604.H"
#define _SUCC_ 0x0f//数据传送成功
#define _ERR_ 0xf0//数据传送失败
unsigned char aa=0xff;//主机与从机之间通信标志
unsigned char temp=0xff;
unsigned char Buff[20];//数据缓冲区
unsigned char recive[6]; //用于保存从机发送的数据
sbit KEY1=P1^3;
//bit KEY1=1;
unsigned int C,V;
//延时1ms函数
void delay_1ms(unsigned int i)
{
unsigned int x,y;
for(x=i;x>0;x--)
for(y=110;y>0;y--);
}
//串口初始化函数
void init()
{
TMOD=0x20; //定时器1工作于方式2
TH1=0xfd;
TL1=0xfd; //波特率为9600
PCON=0;
SCON=0xd0; //串口工作于方式3
TR1=1; //开启定时器
TI=0;
RI=0;
}
//发送数据函数
void SEND_data(unsigned char *Buff)
{
unsigned char i,lenth,check;
lenth=strlen(Buff); //计算数据长度
check=lenth;
TI=0; //发送数据长度
TB8=0; //发送数据帧
SBUF=lenth;
while(!TI);
TI=0;
for(i=0;i<lenth;i++) //发送数据
{
check=check^Buff[i];
TB8=0;
SBUF=Buff[i];
while(!TI);
TI=0;
}
TB8=0; //发送校验字节
SBUF=check;
while(!TI);
TI=0;
}
//接收数据函数
unsigned char RECE_data(unsigned char *Buff)
{
unsigned char i;
unsigned char lenth;
unsigned char check;
RI=0; //接收数据长度
while(!RI);
if(RB8==1)
{
RI = 0;
return 0xfe; //若接收到地址帧,则返回0xfe
}
lenth=SBUF;
RI=0;
check=lenth;
for(i=0;i<lenth;i++) //接收数据
{
while(!RI);
if(RB8==1) //若接收到地址帧,则返回0xfe
return 0xfe;
Buff[i]=SBUF;
check=check^(Buff[i]);
RI=0;
}
while(!RI); //接收校验字节
if(RB8==1) //若接收到地址帧,则返回0xfe
return 0xfe;
temp=SBUF;
RI=0;
check=temp^check; //将从主机接收到的校验码与自己计算的校验码比对
if(check!=0) //校验码不一致,表明数据接收错误,向主机发送错误信号,函数返回0xff
{
TI=0;
TB8=0;
SBUF=_ERR_;
while(!TI);
TI=0;
return 0xff;
}
TI=0; //校验码一致,表明数据接收正确,向主机发送成功信号,函数返回0x00
TB8=0;
SBUF=_SUCC_;
while(!TI);
TI=0;
return 0;
}
//发送从机地址
void ADDR_data(unsigned addr)
{
while(temp!=addr) //主机等待从机返回其地址作为应答信号
{
TI=0; //发送从机地址
TB8=1; //发送地址帧
SBUF=addr;
while(!TI);
TI=0;
RI=0;
while(!RI);
temp=SBUF;
RI=0;
}
}
void keyscan()
{
if(KEY1==0)
{
// LcdWriteCom(0x01); //清屏
delay_1ms(5);
if(KEY1==0)
{
// while(!KEY1);
ADDR_data(0x01);//发送从机地址
temp=_ERR_; //主机等待从机数据接收成功信号
while(temp!=_SUCC_)
{
unsigned char Buff[]={0xfe};
SEND_data(Buff);//发送数据
RI=0;
while(!RI);
temp=SBUF;
RI=0;
}
SM2=0; //接收数据帧
aa=0xff; //从机接收数据,并将数据保存到数据缓冲区
while(aa==0xff)
{
aa=RECE_data(Buff);
// P0 = 0xff;
}
// P0 = 0xfe;
recive[0] = Buff[0];
recive[1] = Buff[1];
recive[2] = Buff[2];
}
}
}
void main()
{
bit buff_v=0;
init();
LCD1602_Init(); //初始化LCD1602
LCD1602_ShowString(1,1,"Current: A");
LCD1602_ShowString(2,1,"Voltage: V");
while(1)
{
// delay_1ms(50);
KEY1=0;
keyscan();
delay_1ms(50);
C=recive[0];
V=recive[2];
C=C*1.31+5;
V=V*0.5;
LCD1602_ShowNum(1,10,3,C);
// LCD1602_ShowNum(2,10,3,V);
if(V<38 || V>55 && buff_v==0) {LCD1602_ShowString(2,1,"WARN!!!! ");buff_v=1;}
else if(V>=38 && V<=55 && buff_v==1){LCD1602_ShowString(2,1,"Voltage: V");buff_v=0;}
else if(V>=38 && V<=55 && buff_v==0) LCD1602_ShowFloat_Num(2,10,2,V);
KEY1=1;
}
}
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温馨提示
C51单片机的串口主从机通信在LCD1602液晶屏幕上实时显示电流并监测电压KEIL软件源码+仿真,主机能够监测电压电流值,并在l1206液晶屏幕上实时显示电流和工作状态。运行电压正常时(3.8-5.5V)主机液晶屏幕显示Normal(正常),从机亮绿灯;当电压过高或者过低时,主机液晶屏幕显示Warning(报警),从机亮红灯,同时继电器动作,启用备用电源;当原电路电压恢复正常时,继电器恢复,正常运行。
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