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  475531072 2016-05-21 16:28:43

  /*************** writer:shopping.w ******************/ #include <reg52.h> #include <intrins.h> #define uint unsigned int #define uchar unsigned char #define delayNOP() {_nop_();_nop_();_nop_();_nop_();} sbit DQ = P3^3; sbit LCD_RS = P2^0; sbit LCD_RW = P2^1; sbit LCD_EN = P2^2; uchar code Temp_Disp_Title[]={"Current Temp : "}; uchar Current_Temp_Display_Buffer[]={" TEMP: "}; uchar code Temperature_Char[8] = { 0x0c，0x12，0x12，0x0c，0x00，0x00，0x00，0x00 }; uchar code df_Table[]= { 0，1，1，2，3，3，4，4，5，6，6，7，8，8，9，9 }; uchar CurrentT = 0; uchar Temp_Value[]={0x00，0x00}; uchar Display_Digit[]={0，0，0，0}; bit DS18B20_IS_OK = 1; void DelayXus(uint x) { uchar i; while(x--) { for(i=0;i<200;i++); } } bit LCD_Busy_Check() { bit result; LCD_RS = 0; LCD_RW = 1; LCD_EN = 1; delayNOP(); result = (bit)(P0&0x80); LCD_EN=0; return result; } void Write_LCD_Command(uchar cmd) { while(LCD_Busy_Check()); LCD_RS = 0; LCD_RW = 0; LCD_EN = 0; _nop_(); _nop_(); P0 = cmd; delayNOP(); LCD_EN = 1; delayNOP(); LCD_EN = 0; } 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); 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; } 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; } Display_Digit[0] = df_Table[Temp_Value[0]&0x0f]; CurrentT = ((Temp_Value[0]&0xf0)>>4) | ((Temp_Value[1]&0x07)<<4); Display_Digit[3] = CurrentT/100; Display_Digit[2] = CurrentT%100/10; Display_Digit[1] = CurrentT%10; Current_Temp_Display_Buffer[11] = Display_Digit[0] + '0'; Current_Temp_Display_Buffer[10] = '.'; Current_Temp_Display_Buffer[9] = Display_Digit[1] + '0'; Current_Temp_Display_Buffer[8] = Display_Digit[2] + '0'; Current_Temp_Display_Buffer[7] = Display_Digit[3] + '0'; if(Display_Digit[3] == 0) Current_Temp_Display_Buffer[7] = ' '; if(Display_Digit[2] == 0&&Display_Digit[3]==0) Current_Temp_Display_Buffer[8] = ' '; if(ng) { if(Current_Temp_Display_Buffer[8] == ' ') Current_Temp_Display_Buffer[8] = '-'; else if(Current_Temp_Display_Buffer[7] == ' ') Current_Temp_Display_Buffer[7] = '-'; else Current_Temp_Display_Buffer[6] = '-'; } Set_LCD_POS(0x00); for(i=0;i<16;i++) { Write_LCD_Data(Temp_Disp_Title[i]); } Set_LCD_POS(0x40); for(i=0;i<16;i++) { Write_LCD_Data(Current_Temp_Display_Buffer[i]); } Set_LCD_POS(0x4d); Write_LCD_Data(0x00); Set_LCD_POS(0x4e); Write_LCD_Data('C'); } void main() { LCD_Initialise(); Read_Temperature(); Delay(50000); Delay(50000); while(1) { Read_Temperature(); if(DS18B20_IS_OK) Display_Temperature(); DelayXus(100); } } 以上程序來自《單片機(jī)C語(yǔ)言程序設(shè)計(jì)實(shí)訓(xùn)100例基于8051+Proteus仿真》

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