DS18B20溫度傳感器C程序

1、ds18b20溫度傳感器c程序ds18b20溫度傳感器c程序單片機型號：stc89c54rd+, stc89c52rc 測 試通過。晶震頻率：11.05924使用時只需要修改對應(yīng)的外部管腳即可。main.c：#include #include sbit io_18b20 = p3a2; /18b20 通訊引腳。extern void delayx1 ous(unsigned char t);extern bit getl8b20temp(int *temp);extern bit getl8b20ack();extern bit startl8b20();unsigned char code

2、ledchar = oxco, 0xf9, 0xa4, oxbo, 0x99, 0x92, 0x82, 0xf8,0x80, 0x90, 0x88, 0x83, 0xc6, oxal, 0x86,0x8e);數(shù)碼管編碼0-funsigned char ledbuff12 = oxff, oxff, oxff, oxff, oxff, oxff,oxff, oxff, oxff, oxff, oxff, oxff;int temp=l;unsigned char fig;unsigned char t0rh,t0rl;void configtimero(unsigned int ms) 開內(nèi) 部

3、定時器延時，到時間后觸發(fā)中斷。unsigned long tmp;tmp = 11059200 / 12;tmp = (tmp * ms) /1000;tmp = 65536 - tmp;tmp = tmp + 18;t0rh = (unsigned char)(tmp8);torl = (unsigned char)tmp;tmod &= oxfo;tmod |= 0x01;th0 = t0rh;tlo = torl;eto = 1;tro = x;)void ledscan()序。數(shù)碼管掃描程static unsigned char i = 0,a=0xf8;/pl是數(shù)碼pl = oxff

4、;管數(shù)據(jù)引腳，注意跟據(jù)實際情況修改 器數(shù)據(jù)輸入引腳，注意跟據(jù)實際情況修改 我這里12個數(shù)碼管，2個138譯碼器，所以最 大掃描到0x04.po = (p0 & a) i a;/po是138譯碼pl = ledbuffi;if (i sizeof(ledbuff)-l)i+；elsei = 0;if(a=0x04)a=0xf8,p0=0xf8;/12 個數(shù)碼管，范圍從0xf8到0x04,不用糾結(jié)這個，跟 電路有關(guān)系，12個數(shù)碼管得用2個138譯碼器。a+;) void main()unsigned char s=0;p0=0xf8;啟動檢測18b20器件,startl8b20();如有此器件，寫

5、入命令。啟動內(nèi)部定時器延configtimero(2);時。while(l)if(flg=l) 每中斷200次這里fig值1, 采集18b20的時間不要太快，建議大約延時1 秒一次。 startl8b20();s=getl8b20temp( & temp);/ 給18b20 一個存放數(shù)據(jù)的變量。flg=o；if(s)；取數(shù)ledbuff6=ledchar(temp4)/10據(jù)高位ledbuff5=ledchar(temp4) % 10&0x7f；取數(shù)據(jù)低位ledbuff4=ledchar(temp&0xf)*625/1000;取小數(shù)1位。)else;沒有檢測到器件時錯誤處理。)void int

6、errupttimero() interrupt 1 (static unsigned char n=0;tho = torh;tlo = torl;ledscan();n+;if(n=200)n=0,flg=l;)18b20.c#include #include sbit io 18b20 = p3a2; extern int temp;void delayx 10us(unsigned char t) (do _nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_(); while (t);)bit getl8b20ack

7、()(bit ack;ea = 0;io 18b20 = 0;delayx10us(50);io 18b20 = 1;delayx10us(6);ack = io 18b20; while(!io_18b20);ea=1;return ack;) void writel8b20(unsigned char dat)(unsigned char mask;ea = 0;for(mask=0x01; mask!= 0; mask=l) (io 18b20 = 0;_nop_();_nop_();if(mask&dat) = 0)io 18b20 = 0;elseio 18b20 = 1;delay

8、x10us(6);io 18b20 = l;)ea=1;)unsigned char readl8b20()(unsigned char dat;unsigned char mask;ea = 0;for(mask=0x01; mask!=0; mask=l) (io 18b20 = 0;_nop_();_nop_();io 18b20 = l;_nop_();_nop_();if(!io_18b20)dat &=mask;elsedat 1= mask;delayx10us(6);)ea=1;return dat;)bit startl8b20()(bit ack;ack = getl8b20ack();if(ack = 0)(writel8b20(0xcc);writel8b20(0x44);)return -ack;bit getl8b20temp(int *temp)(bit ack;unsigned char lsb, msb;ack =