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溫度傳感器液晶顯示程序：
- /*************** 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);
- }
- }
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