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【正文】 1302。unsigned char disbuf[]={0,0,0,0}。sbit k4=P1^3。sbit TMDAT=P3^4。//溫度入口void dmsec(unsigned int count)。void tmreset(void)。//ds18b20 reset void tmstart(void)。// void tmrtemp(void)。void Disbuf(unsigned int temper)。void displaytemper()。void delay(unsigned int)。main(){ display_buffer[0]=0x01。display_buffer[1]=0x00。display_buffer[2]=0x00。display_buffer[3]=0x08。display_buffer[4]=0x05。display_buffer[5]=0x00。display_buffer[6]=0x01。display_buffer[7]=0x04。display_buffer[8]=0x00。display_buffer[9]=0x05。display_buffer[10]=0x00。display_buffer[11]=0x01。display_buffer[12]=0x04。while(1){ tmstart()。tmrtemp()。displaytemper()。} }void tmreset(void){unsigned int i。TMDAT = 0。i = 103。while(i0)i。TMDAT = 1。i = 4。while(i0)i。}void tmpre(void){unsigned int i。while(TMDAT)。while(~TMDAT)。i = 4。while(i0)i。}bit tmrbit(void){// ds1820// Reset TXunsigned int i。bit dat。TMDAT = 0。i++。TMDAT = 1。i++。i++。dat = TMDAT。i = 8。while(i0)i。return(dat)。}unsigned char tmrbyte(void){unsigned char i,j,dat。dat = 0。for(i=1。ij = tmrbit()。dat =(j 1)。}return(dat)。}void tmwbyte(unsigned char dat){unsigned int i。unsigned char j。bit testb。for(j=1。jtestb = dat amp。 0x01。dat = dat 1。if(testb){TMDAT = 0。i++。i++。TMDAT = 1。i = 8。while(i0)i。}else {TMDAT = 0。i = 8。while(i0)i。TMDAT = 1。i++。i++。}} }void tmstart(void){tmreset()。tmpre()。// ds1820displaytemper()。//delay(100)。tmwbyte(0xcc)。tmwbyte(0x44)。}void tmrtemp(void){unsigned char a,xiao,b,y1,y2,y3。tmreset()。tmpre()。delay(1)。tmwbyte(0xcc)。tmwbyte(0xbe)。a = tmrbyte()。b = tmrbyte()。xiao=aamp。0x0f。//小數部分y1=a4。y2=by3=y1|y2。if((bamp。0x0f8)==0x0f8){y3=~y3+1。disbuf[0]=10。//顯示符號disbuf[1]=y3/10。disbuf[2]=y3%10。disbuf[3]=xiao*10*。} elsedisbuf[0]=11。//不顯示disbuf[1]=y3/10。disbuf[2]=y3%10。disbuf[3]=xiao*10*。}void displaytemper()//溫度顯示函數{ unsigned int i。unsigned char e=0x01。//{ switch(i){case 1:{SEGMENT=table[disbuf[1]]。BIT_LED=e。break。}case 2:{SEGMENT=table1[disbuf[2]]。BIT_LED=e。break。}case 3:{SEGMENT=table[disbuf[3]]。BIT_LED=e。break。}case 4:{SEGMENT=table[12]。BIT_LED=e。break。}case 5:{SEGMENT=table[13]。BIT_LED=e。break。}}e=edelay(80)。}BIT_LED=0。}void delay(unsigned int i)//delay函數 {while(i)。}測試結果：經傳感器及數碼管延時，溫度重新顯示八、時鐘日歷測試測試要求：本系統使用了時鐘日歷專用芯片，該芯片是以串行方式實現控制和數據傳輸的。編寫如下程序進行測試： include include include include define SEGMENT XBYTE[0x0c000]//段碼寄存器地址 define BIT_LED XBYTE[0x0a000]//位碼寄存器地址 define fosc unsigned char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x67,0x40,0x00,0x63,0x39,}。unsigned char table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef}。unsigned char table2[]={0x76,0x79,0x38,0x38,0x3f}。sbit k1=P1^0。sbit k2=P1^1。sbit k3=P1^2。sbit k4=P1^3。//利用開關量實現切換//頻率變量及子函數預定義 void displayfreq()。void read_freq()。unsigned char tcount=0,timecount=0。unsigned long freq=。bit freqflag=0。unsigned char fr[6]。unsigned int i=0,x=0。//日期變量及子函數預定義 sbit SCL_ds1302=P2^0。sbit IO_ds1302=P2^1。sbit RST_ds1302=P2^2。unsigned char data display_buffer[13]。unsigned char bdata data_ds1302。//傳輸符unsigned char disbuf[]={0,0,0,0}。void open_write_bit()。void initial_ds1302()。unsigned char read_ds1302(char mand)。void close_write_bit()。void read_time()。void set_time()。void delay(unsigned int i)。void delayms(unsigned int i)。void displaytime()。void displaydate()。main(){ initial_ds1302()。//上電走時read_time()。//讀取當前時間，放到數組中display_buffer[0]=0x01。display_buffer[1]=0x05。display_buffer[2]=0x01。display_buffer[3]=0x07。display_buffer[4]=0x04。display_buffer[5]=0x00。display_buffer[6]=0x01。display_buffer[7]=0x06。display_buffer[8]=0x00。display_buffer[9]=0x05。display_buffer[10]=0x00。display_buffer[11]=0x01。display_buffer[12]=0x04。set_time()。//設置時間while(1){if(k1==0){while(1){read_time()。displaytime()。if(k2==0)break。}}read_time()。displaydate()。} }void close_write_bit()//close write { unsigned int i。SCL_ds1302=0。_nop_()。RST_ds1302=1。_nop_()。_nop_()。data_ds1302=0x8e。for(i=1。iSCL_ds1302=0。IO_ds1302=(data_ds1302amp。0x01)。_nop_()。SCL_ds1302=1。data_ds1302=data_ds13021。} data_ds1302=0x80。IO_ds1302=0。for(i=1。iSCL_ds1302=0。IO_ds1302=(data_ds1302amp。0x01)。_nop_()。SCL_ds1302=1。data_ds1302=data_ds13021。} }void open_write_bit()//open write { unsigned int i。SCL_ds1302=0。_nop_()。//打開寫保護//關閉寫保護RST_ds1302=1。_nop_()。_nop_()。data_ds1302=0x8e。for(i=1。iSCL_ds1302=0。IO_ds1302=data_ds1302amp。0x01。_nop_()。SCL_ds1302=1。data_ds1302=data_ds13021。} data_ds1302=0x00。//0x00，書上為0x80 IO_ds1302=0。for(i=1。iSCL_ds1302=0。IO_ds1302=data_ds1302amp。0x01。_nop_()。SCL_ds1302=1。data_ds1302=data_ds13021。} }void initial_ds1302()//初始化函數 { unsigned int i。SCL_ds1302=0。_nop_()。RST_ds1302=1。_nop_()。_nop_()。data_ds1302=0x8e。for(i=1。iSCL_ds1302=0。IO_ds1302=data_ds1302amp。0x01。_nop_()。SCL_ds1302=1。data_ds1302=data_ds13021。} IO_ds1302=0。data_ds1302=0x00。for(i=1。iSCL_ds1302=0。IO_ds1302=data_ds1302amp。0x01。_nop_()。SCL_ds1302=1。data_ds1302=data_ds13021。} RST_ds1302=0。SCL_ds1302=0。_nop_()。RST_ds1302=1。_nop_()。_nop_()。data_ds1302=0x90。for(i=1。i1。}data_ds1302=0x0a4。for(i=1。i1。} RST_ds1302=0。_nop_()。SCL_ds1302=0。_nop_()。RST_ds1302=1。data_ds1302=0x8e。for(i=1。i1。}data_ds1302=0x80。for(i=1。i1。} RST_ds1302=0。_nop_()。SCL_ds1302=0。}unsigned char read_ds1302(char mand)//read函數 { unsigned int i。data_ds1302=mand。SCL_ds1302=0。_nop_()。RST_ds1302=1。for(i=1。iSCL_ds1302=0。IO_ds1302=data_ds1302amp。0x01。_nop_()。SCL_ds1302=1。data_ds1302=data_ds13021。}SCL_ds1302=1。for(i=1。iSCL_ds1302=0。if(IO_ds1302)data_ds1302=(data_ds13021)|0x80。//送入到data_ds1302中，準備送出else data_ds1302=1。SCL_ds1302=1。} RST_ds1302=0。_nop_()。SCL_ds1302=0。return(data_ds1302)。}void write_ds1302(unsigned char address,unsigned char numb){unsigned int i。SCL_ds1302=0。RST_ds1302=0。RST_ds1302=1。data_ds1302=address。for(i=1。iSCL_ds1302=0。I