DS18B20组网程序

#include "ds18b20.h" const char crc_code[256]={ 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65, 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220, 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98, 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255, 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7, 219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154, 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36, 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185, 140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205, 17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80, 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238, 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115, 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139, 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22, 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168, 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53 }; uchar init_ds18b20() { uchar temp=0 ; DoutDir=0 ; Dout=1 ; DelayUs(1) ; Dout=0 ; DelayUs(600) ; Dout=1 ; DoutDir=1 ; while(Dout) ; while(!Dout) ///这里使用了超时设置 { DelayUs(24) if(temp==10) { if(Dout) { DoutDir=0 ; return 1 ; } else { return 0 ; } } temp++ ; } DoutDir=0 ; return 1 ; } uchar read_ds18b20() { uchar temp,i ; temp= 0 ; DoutDir=0 ; for(i=0;i<8;i++) { Dout=1 ; DelayUs(1) ; temp=temp>>1 ; Dout=0 ; DelayUs(1) ; Dout=1 ; DoutDir=1 ; DelayUs(8) ; if(Dout) temp=temp|0x80 ; DelayUs(60) ; DoutDir=0 ; } Dout=1 ; return temp ; } void write_ds18b20(uchar data) { uchar temp ,i ; DoutDir=0 ; for(i=0;i<8;i++) { temp=data&0x01 ; if(temp) { Dout=0 ; DelayUs(2) ; Dout=1 ; DelayUs(57) ; } else { Dout=0 ; DelayUs(57) ; Dout=1 ; DelayUs(2) ; } data=data>>1 ; } Dout=1 ; } uint get_temp() { uchar th,tl ; uint temp ; th=0 ; tl=0 ; init_ds18b20() ; write_ds18b20(ROM_SKIP) ; write_ds18b20(MEM_CONVERT) ; init_ds18b20() ; write_ds18b20(ROM_SKIP) ; write_ds18b20(MEM_READ) ; tl=read_ds18b20() ; th=read_ds18b20() ; if(!(th&0xf0)) { th=th&07 ; temp=th*256+tl ; return temp ; } else { th=th&0x07 ; temp=th*256 +tl ; return temp ; } } void get_sequence(uchar *seq) { uchar i ; uchar *temp ; temp=seq ; init_ds18b20() ; write_ds18b20(ROM_READ) ; for(i=0;i<8;i++) { *temp++=read_ds18b20() ; } return ; } char get_configure() { char temp,i ; i=0 ; init_ds18b20() ; write_ds18b20(ROM_SKIP) ; write_ds18b20(MEM_READ) ; temp=0 ; while(++i) { temp=read_ds18b20() ; if(i==5) return temp ; } } float process_temp(uint data) { return data*0.0625 ; } void configure_ds18b20(uchar flag) { uchar tmp1,tmp2 ; init_ds18b20() ; write_ds18b20(ROM_SKIP) ; write_ds18b20(MEM_READ) ; tmp1=read_ds18b20() ; tmp2=read_ds18b20() ; tmp1=read_ds18b20() ;//get TH tmp2=read_ds18b20() ;//get Tl init_ds18b20() ;// reset bus write_ds18b20(ROM_SKIP) ;//skip rom write_ds18b20(MEM_WRITE) ;//write command write_ds18b20(tmp1) ;// write_ds18b20(tmp2) ;// switch(flag) { case 0 : write_ds18b20(0x1F) ; break ; case 1 : write_ds18b20(0x3F) ; break ; case 2 : write_ds18b20(0x5F) ; break ; case 3 : write_ds18b20(0x7F) ; break ; default : write_ds18b20(0x1F) ; break ; } init_ds18b20() ;//reset bus write_ds18b20(ROM_SKIP) ;//skip rom write_ds18b20(MEM_COPY) ;//copy ram to eeprom write_ds18b20(MEM_RECALL) ;//recopy eeprom to ram } uchar crc_check(uchar *data) { uchar temp ,i; uchar *p=data ; //complement ; temp=0 ; for(i=0;i<7;i++) { temp=crc_code[temp^*p] ; p++ ; } if(temp==data[7]) return 1 ; else return 0 ; } void start_convert() { init_ds18b20() ; write_ds18b20(ROM_SKIP) ; write_ds18b20(MEM_CONVERT) ; } uint read_temp() { uchar tl,th ; uint temp ; tl=0 ; th=0 ; // init_ds18b20() ; // write_ds18b20(0xcc) ;//note that don't skip rom command here ; write_ds18b20(MEM_READ) ; tl=read_ds18b20() ; th=read_ds18b20() ; if(!(th&0xf0)) { th=th&07 ; temp=th*256+tl ; return temp ; } else { th=th&0x07 ; temp=th*256 +tl ; return temp ; } } void match_rom(uchar data[8]) { //uchar *temp=data ; uchar i ; init_ds18b20() ; write_ds18b20(ROM_MATCH) ; for(i=0;i<8;i++) write_ds18b20(data[i]) ; } uint test(const uchar *data)//注意这里一定要用const关键字 { uint temp ; uchar t,tl,th; tl=0 ; th=0 ; // start_convert() ; init_ds18b20() ; write_ds18b20(ROM_MATCH) ; for(t=0;t<8;t++) { write_ds18b20(*data++) ; } write_ds18b20(MEM_READ) ; tl=read_ds18b20() ; th=read_ds18b20() ; if(!(th&0xf0)) { th=th&07 ; temp=th*256+tl ; return temp ; } else { th=th&0x07 ; temp=th*256 +tl ; return temp ; } }