DS18B20温度传感器C程序

1、DS18B20温度传感器C程序DS18B20温度传感器C程序单片机型号：STC89c54RD+, STC89c52RC 测 试通过。晶震频率：11.05924使用时只需要修改对应的外部管脚即可。MAIN.C：#include #include sbit IO_18B20 = P3A2; /18B20 通讯引脚。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);数码管编码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) 开内 部

3、定时器延时，到时间后触发中断。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。数码管扫描程static unsigned char i = 0,a=0xF8;/Pl是数码Pl = OxFF

4、;管数据引脚，注意跟据实际情况修改 器数据输入引脚，注意跟据实际情况修改 我这里12个数码管，2个138译码器，所以最 大扫描到0x04.PO = (P0 & a) I a;/PO是138译码Pl = LedBuffi;if (i sizeof(LedBuff)-l)i+；elsei = 0;if(a=0x04)a=0xF8,P0=0xF8;/12 个数码管，范围从0xF8到0x04,不用纠结这个，跟 电路有关系，12个数码管得用2个138译码器。a+;) void main()unsigned char s=0;P0=0xF8;启动检测18B20器件,Startl8B20();如有此器件，写

5、入命令。启动内部定时器延ConfigTimerO(2);时。while(l)if(flg=l) 每中断200次这里fig值1, 采集18B20的时间不要太快，建议大约延时1 秒一次。 Startl8B20();s=Getl8B20Temp( & temp);/ 给18B20 一个存放数据的变量。flg=o；if(s)；取数LedBuff6=LedChar(temp4)/10据高位LedBuff5=LedChar(temp4) % 10&0x7F；取数据低位LedBuff4=LedChar(temp&0xF)*625/1000;取小数1位。)else;没有检测到器件时错误处理。)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 =