#include "reg52.h"
#include "onewire.h"sbit HC138_A = P2^5;
sbit HC138_B = P2^6;
sbit HC138_C = P2^7;        sbit S5 = P3^2;
sbit S4 = P3^3;        unsigned char code SMG_NoDot[18] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x80,0xc6,0xc0,0x86,0x8e,0xbf,0x7f};
unsigned char code SMG_IsDot[10] = {0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};unsigned int temp = 0;void DelaySMG(unsigned int time)
{while(time--);
}void Init74HC138(unsigned char n)
{switch(n){case 4:HC138_A = 0;HC138_B = 0;HC138_C = 1;break;case 5:HC138_A = 1;HC138_B = 0;HC138_C = 1;break;case 6:HC138_A = 0;HC138_B = 1;HC138_C = 1;break;case 7:HC138_A = 1;HC138_B = 1;HC138_C = 1;break;case 8:HC138_A = 0;HC138_B = 0;HC138_C = 0;break;}
}void DispaySMG_Bit(unsigned char value, unsigned char pos)
{Init74HC138(6);P0 = (0x01 << pos);Init74HC138(7);P0 = value;
}void ReadTemperature()
{unsigned char LSB,MSB ;Init_DS18B20(); Write_DS18B20(0xCC); Write_DS18B20(0x44); Init_DS18B20(); Write_DS18B20(0xCC); Write_DS18B20(0xBE); LSB = Read_DS18B20(); MSB = Read_DS18B20(); temp = 0x0000;temp = MSB;temp <<= 8;temp = temp | LSB;temp >>= 4;temp = temp*10;temp = temp + (LSB&0x0f)*0.625;if((MSB>>4) == 0x0f){temp |= 0x8000;}
}void ShowTemperature()
{DispaySMG_Bit(SMG_NoDot[temp%10],7);DelaySMG(500);DispaySMG_Bit(0xff,0);DispaySMG_Bit(SMG_IsDot[(temp/10)%10],6);DelaySMG(500);DispaySMG_Bit(0xff,0);DispaySMG_Bit(SMG_NoDot[(temp/100)%10],5);DelaySMG(500);DispaySMG_Bit(0xff,0);
}void main()
{while(1){ReadTemperature();ShowTemperature();}
}