Atmega16 驱动LCD1602

//*************************************************************** #include "reg52.h" #include "intrins.h" #define uchar unsigned char #define uint unsigned int sbit DQ_DS18B20=P1^2; void Delay_ds18b20(uint Postpone) { while(Postpone--); } char Init_ds18b20() { uchar DQ; DQ_DS18B20=0; Delay_ds18b20(80); DQ_DS18B20=1; Delay_ds18b20(7); DQ=DQ_DS18B20; Delay_ds18b20(25); return DQ; } void Start_ds18b20() { char i=0; while(!i) { if(!Init_ds18b20()) i=1; } } void Wr_ds18b20(uchar COM_DS18B20) { uchar i; for(i=8;i>0;i--) { DQ_DS18B20=0; _nop_(); COM_DS18B20>>=1; DQ_DS18B20=CY; Delay_ds18b20(6); DQ_DS18B20=1; } } uchar *Re_ds18b20() { uchar i,j,Temp,Tem[2]; // uint temperature; for(j=2;j>0;j--) { for(i=8;i>0;i--) { DQ_DS18B20=0; _nop_(); DQ_DS18B20=1; _nop_(); Temp>>=1; if(DQ_DS18B20) Temp|=0X80; Delay_ds18b20(10); } if(j==1) Tem[1]=Temp; //高位 else Tem[0]=Temp; //低位 } return Tem; } /* 读取温度，大于10000时是负数，需要减去40000得出实际无符号值 */ uint Re_temperature() { bit sign=0; uchar *tem; uint temperature; Start_ds18b20(); Wr_ds18b20(0XCC); Wr_ds18b20(0X44); Start_ds18b20(); Wr_ds18b20(0XCC); Wr_ds18b20(0XBE); tem=Re_ds18b20(); if(tem[1]>0x0f) { sign=1; tem[1]=~tem[1]; tem[0]=~tem[0]+1; } temperature=(tem[1]*256.0+tem[0])*6.25; if(sign) temperature+=40000; return temperature; } //***************************************************************