【文章內(nèi)容簡介】 isplay_Buffer[]= { SET: }。int sel=0。void Comparison()。//////////////////////定時///////////////////////////////void timer0_init(void){TMOD = 0x00 。 //設置定時器 0 的工作方式TH0 = (81925000)/32。//單片機晶振為 12MHz，機器周期為 1us，t=5ms ， //N=5000/1=5000TL0 = (81925000)%32。IE = 0x82。TR0=1。}void timer0() interrupt 1 { TH0 = (81925000)/32。TL0 = (81925000)%32。 if(++T_Count == 100) //////100 為 { TR0=0。Read_Temperature()。Display_Temperature() 。T_Count=0。if(++P_Count == 6){ N_Count=1。} TR0=1。}}////////////////////主程序///////////////////////////////void main()19{init_lcd()。Init_DS18B20()。timer0_init()。while(1){Print()。set_num()。Comparison()。}}void Comparison(){if(N_Countamp。amp。M_Count){if(TEMP_NOWTEMP_SET){warm=1。cold=0。}if(TEMP_NOWTEMP_SET){cold=1。warm=0。}if(TEMP_NOW==TEMP_SET){cold=0。warm=0。}}}:ifndef _18B20_H20define _18B20_Hincludeextern uchar Init_DS18B20()。 extern void Read_Temperature()。extern void Display_Temperature()。endif:includeinclude define delayNOP() {_nop_()。_nop_()。_nop_()。_nop_()。}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 Delay_INI(uint x){ while(x)。}void Delay(unsigned int n){do{_nop_()。_nop_()。_nop_()。_nop_()。_nop_()。_nop_()。_nop_()。_nop_()。_nop_()。21n。}while(n)。}uchar Init_DS18B20() { uchar status。DQ = 1。Delay_INI(8)。DQ = 0。Delay_INI(90)。DQ = 1。Delay_INI(8)。status=DQ。Delay_INI(100)。DQ = 1。return status。}uchar ReadOneByte(){ uchar i,dat=0。DQ = 1。_nop_()。for(i=0。i8。i++){ DQ = 0。dat = 1。DQ = 1。_nop_()。_nop_()。if(DQ)dat |= 0X80。Delay(30)。22DQ = 1。}return dat。}void WriteOneByte(uchar dat){ uchar i。for(i=0。i8。i++){ DQ = 0。DQ = datamp。 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(){23uchar t = 150, ng = 0。if((Temp_Value[1]amp。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]amp。0x0f]。CurrentT = ((Temp_Value[0]amp。0xf0)4) | ((Temp_Value[1]amp。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] + 39。039。Current_Temp_Display_Buffer[10] = 39。.39。Current_Temp_Display_Buffer[9] = Display_Digit[1] + 39。039。Current_Temp_Display_Buffer[8] = Display_Digit[2] + 39。039。Current_Temp_Display_Buffer[7] = Display_Digit[3] + 39。039。TEMP_NOW=Display_Digit[2]*10+Display_Digit[1]+Display_Digit[0]* 。if(Display_Digit[3] == 0)Current_Temp_Display_Buffer[7] = 39。 39。if(Display_Digit[2] == 0amp。amp。Display_Digit[3]==0)Current_Temp_Display_Buffer[8] = 39。 39。if(ng){TEMP_NOW=(Display_Digit[2]*10+Display_Digit[1]+Display_Digit[0]*)。 if(Current_Temp_Display_Buffer[8] == 39。 39。)Current_Temp_Display_Buffer[8] = 39。39。else if(Current_Temp_Display_Buffer[7] == 39。 39。)Current_Temp_Display_Buffer[7] = 39。39。else 24Current_Temp_Display_Buffer[6] = 39。39。} }：ifndef _KEY_Hdefine _KEY_Hincludeextern unsigned char Keys_Scan()。extern void set_num()。extern void set()。endif：include include include includeuchar code KeyCodeTable[]={ 0x11,0x12,0x14,0x18,0x21,0x22,0x24,0x28,0x41,0x42,0x44,0x48,0x81,0x82,0x84,0x88}。void Delay_key(){ uchar i。for(i=0。i200。i++)。}uchar Keys_Scan(){ uchar sCode,kCode,k。P3 = 0xf0。if((P3amp。0xf0)!=0xf0)25{ Delay_key()。if((P3amp。0xf0)!=0xf0){ sCode = 0xfe。for(k=0。k4。k++){ P3 = sCode。if((P3amp。0xf0)!=0xf0){ kCode = ~P3。if(kCode == KeyCodeTable[0]) return K_ONE。 else if(kCode == KeyCodeTable[1]) return K_TWO。else if(kCode == KeyCodeTable[2]) return K_THREE。else if(kCode == KeyCodeTable[3]) return K_FOUR。else if(kCode == KeyCodeTable[4]) return K_FIVE。else if(kCode == KeyCodeTable[5]) return K_SIX。else if(kCode == KeyCodeTable[6]) return K_SEVEN。else if(kCode == KeyCodeTable[7]) return K_EIGHT。else if(kCode == KeyCodeTable[8]) return K_NINE。else if(kCode == KeyCodeTable[9]) return K_UP。else if(kCode == KeyCodeTable[10]) return K_DOWN。else if(kCode == KeyCodeTable[11]) return K_CLEAR。else if(kCode == KeyCodeTable[12]) return K_OK。else if(kCode == KeyCodeTable[13]) return K_ZERO。else if(kCode == KeyCodeTable[14]) return K_POINT。else if(kCode == KeyCodeTable[15]) return K_SET。}else sCode = _crol_(sCode,1)。}}}return 1。}26void set_num(){uchar key。if(sel==0){key = Keys_Sc