1-wire_search.rar_romid搜索

#define TRUE 1; #define FALSE 0; unsigned char id_bit; unsigned char cmp_id_bit; unsigned char *id_bit_number; bit LastDeviceFlag; bit LastDiscrepancy; bit LastFamilyDiscrepancy; unsigned char last_zero; unsigned char ROM_NO[64]; bit search_direction; bit search_1_wire(){ bit flag; LastDeviceFlag=0; flag=bus_reset(); if(flag==0){ if(LastDeviceFlag==0) id_bit_number=ROM_NO; last_zero=0; send_matchRom(0x0f); for(;id_bit_number<=ROM_NO+63;id_bit_number++){ id_bit=read_bit(); cmp_id_bit=~id_bit+1; if((id_bit!=1)||(cmp_id_bit!=1)){ if((id_bit==0)&&(cmp_id_bit==0)) if(id_bit_number!=LastDiscrepancy) if(id_bit_number>LastDiscrepancy) search_direction=0; else search_direction=*id_bit_number; else search_direction=1; else search_direction=id_bit; if(search_direction==0){ last_zero=id_bit_number; if(last_zero<9) LastFamilyDiscrepancy=last_zero; } } *id_bit_number=search_direction; write_bit(id_bit_number); } LastDiscrepancy=last_zero; if(LastDiscrepancy==0) LastDeviceFlag=1; if(LastDiscrepancy==LastFamilyDiscrepancy) LastFamilyDiscrepancy=0; return TRUE; } else { LastDiscrepancy=0; LastFamilyDiscrepancy=0; LastDeviceFlag=0; return FALSE; } }