PIC单片机使用1602显示DS18B20温度数据

#include <pic.h> __CONFIG(HS&WDTDIS&LVPDIS); #define _XTAL_FREQ 40000000 #define E RB3 #define RW RB4 #define RS RB5 const unsigned char table[16]={0,6,12,18,25,31,37,43,50,56,62,68,75,81,87,93}; unsigned char temp1,temp2; void delay(unsigned int n) { unsigned int i; for(i=0;i<n;i++); } void test(void) { TRISD7=1; RS=0; RW=1; E=1; while(RD7==1); E=0; TRISD7=0; } void write_data(unsigned char data) { RS=1; RW=0; PORTD=data; E=1; E=0; } void write_data_test(unsigned char data) { test(); RS=1; RW=0; PORTD=data; E=1; E=0; } void write_command(unsigned char command) { RS=0; RW=0; PORTD=command; E=1; E=0; } void write_command_test(unsigned char command) { test(); RS=0; RW=0; PORTD=command; E=1; E=0; } void write_address(unsigned char x,unsigned char y) { x&=0X0F; y&=0X01; if(y==0) write_command_test(0X80|x); if(y==1) write_command_test((0X40+x)|0X80); } void display(unsigned char x,unsigned char y,unsigned char data) { write_address(x,y); write_data_test(data); } void init(void) { delay(1500); write_command(0X38); delay(500); write_command(0X38); delay(500); write_command(0X38); write_command_test(0X38); write_command_test(0X08); write_command_test(0X01); write_command_test(0X06); write_command_test(0X0C); } unsigned char reset(void) { unsigned int i; unsigned char k; TRISA4=0; RA4=0; i=67; while(i>0) i--; TRISA4=1; i=6; while(i>0) i--; if(RA4==0) k=0; else k=1; i=31; while(i>0) i--; return k; } void writebyte(unsigned char data) { unsigned char i; unsigned char j; for(j=0;j<8;j++) { if(data&0x01) { TRISA4=0; RA4=0; NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); TRISA4=1; i=5; while(i>0) i--; } else { TRISA4=0; RA4=0; i=5; while(i>0) i--; TRISA4=1; NOP(); NOP(); } data=data>>1; } } unsigned char readbyte(void) { unsigned char buf=0; unsigned char i,j; for(j=1;j<=8;j++) { buf=buf>>1; TRISA4=0; RA4=0; NOP(); NOP(); TRISA4=1; NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); if(RA4==1) buf|=0x80; i=4; while(i>0) i--; } return buf; } unsigned char convert(void) { unsigned int i; if(reset()==0) { i=77; while(i>0) i--; writebyte(0xcc); writebyte(0x44); return 1; } else { return 0; } } void readflash(void) { unsigned int i; unsigned char low,high; if(reset()==0) { i=77; while(i>0) i--; writebyte(0xcc); writebyte(0xbe); low=readbyte(); high=readbyte(); temp2=low&0x0f; temp1=(low>>4)|(high<<4); } else { temp1=0; temp2=0; } } void main(void) { unsigned char buf; double temperature; TRISA=0B11101111; PORTA=0B00000000; TRISB=0B11000111; TRISD=0B00000000; PORTB=0B00000000; PORTD=0B00000000; TRISC=0B11111011; PORTC=0B00000000; init(); display(2,0,'T'); display(3,0,'E'); display(4,0,'M'); display(5,0,'P'); display(6,0,'E'); display(7,0,'R'); display(8,0,'A'); display(9,0,'T'); display(10,0,'U'); display(11,0,'R'); display(12,0,'E'); while(1) { if(convert()==1) { readflash(); if(temp1>99) temp1=99; if(temp2>15) temp2=0; display(5,1,temp1/10+'0'); display(6,1,temp1%10+'0'); display(7,1,'.'); display(8,1,table[temp2]/10+'0'); display(9,1,table[temp2]%10+'0'); temperature=temp1+(double)table[temp2]*0.01; if(temperature>30) { PORTC=0B00000100; __delay_ms(40); PORTC=0B00000000; __delay_ms(15); } } } }