lcd16.c

pic16f877a使用iic总线方式驱动低价温度芯片tc74

#include"pic.h"
#include"i2c.c"
__CONFIG(HS&WDTDIS&PWRTDIS&BORDIS);
#define rs RA3 //液晶引脚定义
#define rw RA2 //同上
#define lcden RA1//同上
#define uchar unsigned char
unsigned char  table[]="0123456789";  //液晶列表
unsigned char table1[]="the temperature";  //同上
bank1 unsigned char  table2[]="start work time";  //同上
bank1 unsigned char table3[]="  wait to work ";  //同上
bank1 unsigned char  table4[]="    on work    ";  //同上
bank2 unsigned char  table5[]="    last set   ";  //同上

void init(void)//io口初始化
{
TRISD=0;
TRISB=0XF9;
CMCON=0X07;
ADCON1=0X07;
TRISA=0;
rw=0;
}
void delay()    //液晶延时
{
    unsigned int a,b;
	for(a=10;a>0;a--)
		for(b=10;b>0;b--); 
}

void delay1(int x)   //液晶延时
{
    unsigned int a1,b1;
    for(a1=x;a1>0;a1--)
    	for(b1=10;b1>0;b1--); 
}
/////////////液晶/////////////
void write_com(char com)   //液晶写指令（串行）
{
char port;
  port=com;
  port=port&0xf0;
  port>>=4;
//	PORTD=com|0x0f;
PORTD&=0Xf0;
PORTD=port|PORTD;
	rs=0;
	lcden=0;
	delay();
	lcden=1;
	delay();
    lcden=0;
    com<<=4;
  //  PORTD=com|0x0f;
 port=com;
  port=port&0xf0;
  port>>=4;
//	PORTD=com|0x0f;
PORTD&=0Xf0;
PORTD=port|PORTD;
	lcden=0;
    delay();
	lcden=1;
	delay();
    lcden=0;
	
}

void write_date(char date)   //液晶写数据（串行）
{
  char port;
//	PORTD=date|0x0f;
 port=date;
  port=port&0xf0;
 port>>=4;
//	PORTD=com|0x0f;
PORTD&=0Xf0;
PORTD=port|PORTD;
	rs=1;
	lcden=0;
    delay1(10);
	lcden=1;
	delay1(10);
   	lcden=0;
    date<<=4;
   // PORTD=date|0x0f;
   port=date;
  port=port&0xf0;
  port>>=4;
//	PORTD=com|0x0f;
PORTD&=0Xf0;
PORTD=port|PORTD;
	lcden=0;
    delay1(10);
	lcden=1;
	delay1(10);
    lcden=0;
}
void initsreen()    //液晶初始化
{
	write_com(0x28);
	delay1(10);
	write_com(0x0c);
	delay1(10);
	write_com(0x06);
	delay1(10);
	write_com(0x01);
	delay1(10);	
}
void display_char(uchar n1)   //display hour(n=0) and minute(n=3)
{
   uchar i=0;
	write_com(0x80); 
   for(i=0;i<15;i++)
   {
    if(n1==1)
     write_date(table1[i]);
    else if(n1==2)
     write_date(table2[i]);
	else if(n1==3)
    write_date(table3[i]);
	else if(n1==4)
    write_date(table4[i]);
	else 
	write_date(table5[i]);  ;

  }
   
}

void display_time(unsigned int y1,uchar n)   //display hour(n=0) and minute(n=3)
{
	unsigned int temp,temp1;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
    temp=y1;
   
    temp1=(temp/10)%10;
	write_com(0xC5+n);
	write_date(table[temp1]); 
  temp1=temp%10;
 	write_date(table[temp1]);    
}

void main(void)
{
unsigned int m;
init();
i2cint();
initsreen();

display_char(1);

while(1){

code=0x01;//figure word 
tem_read();

while(jdate&0x40==0)//whether ready for reading
{
code=0x01;
tem_read();
}
code=0x00;//temperature word 
tem_read();
display_time(jdate,1);//temperature display
delay();
}

}