搜索单总线上多个DS18B20

#defineskiprom_cmd1820();wr_byte1820(0xcc);#definerdrom_cmd1820;wr_byte1820(0x33);#definesearch_cmd1820();wr_byte1820(0xf0);#definematchrom_cmd1820();wr_byte1820(0x55);#defineconvert_cmd1820();wr_byte1820(0x44);#definewrscrar_cmd1820();wr_byte1820(0x4e);#definerdscrat_cmd1820();wr_byte1820(0xbe);#definecopyscrat_cmd18