温度传感器论文--杨双卉(3)

void Write_LCD_Data(uchar dat) { while(LCD_Busy_Check()); LCD_RS = 1; LCD_RW = 0; LCD_EN = 0; P0 = dat; delayNOP(); LCD_EN = 1; delayNOP(); LCD_EN = 0; }

void LCD_Initialise() {

Write_LCD_Command(0x01); DelayXus(5); Write_LCD_Command(0x38); DelayXus(5); Write_LCD_Command(0x0c); DelayXus(5);

数字测温;温度传感器DS18B20;单片机STC89C52;LCD1602显示器

Write_LCD_Command(0x06); DelayXus(5); }

void Set_LCD_POS(uchar pos) {

Write_LCD_Command(pos|0x80); }

void Delay(uint x) {

while(--x); }

uchar Init_DS18B20() {

uchar status; DQ = 1; Delay(8); DQ = 0; Delay(90); DQ = 1; Delay(8); DQ = 1; return status; }

uchar ReadOneByte() {

uchar i,dat=0; DQ = 1; _nop_(); for(i=0;i<8;i++) { DQ = 0; dat >>= 1; DQ = 1; _nop_(); _nop_(); if(DQ) dat |= 0X80; Delay(30); DQ = 1; }

数字测温;温度传感器DS18B20;单片机STC89C52;LCD1602显示器

return dat; }

void WriteOneByte(uchar dat) {

uchar i; for(i=0;i<8;i++) { DQ = 0; DQ = dat& 0x01; Delay(5); DQ = 1; dat >>= 1; } }

void Read_Temperature() {

if(Init_DS18B20()==1) DS18B20_IS_OK=0; else { WriteOneByte(0xcc); WriteOneByte(0x44); Init_DS18B20(); WriteOneByte(0xcc); WriteOneByte(0xbe); Temp_Value[0] = ReadOneByte(); Temp_Value[1] = ReadOneByte(); DS18B20_IS_OK=1; } }

void Display_Temperature() {

uchar i; uchar t = 150, ng = 0; if((Temp_Value[1]&0xf8)==0xf8) { Temp_Value[1] = ~Temp_Value[1]; Temp_Value[0] = ~Temp_Value[0]+1; if(Temp_Value[0]==0x00) Temp_Value[1]++; ng = 1;