typedef struct _DVE_SN { uint8_t vendor; uint8_t dev_type:5; uint8_t subcode:3;
uint8_t year;
uint8_t month;
uint8_t day;
uint8_t num_h;
uint8_t num_l;
uint8_t check_sum;
}DVE_SN;
uint8_t GetSnCheckSum(const DVE_SN * sn) { uint8_t * point=(uint8_t *)sn; sn->check_sum=0; for(uint8_t i=0;i<sizeof(DVE_SN)-1;i++) { if(i==0) { sn->check_sum=(point[i]*point[i])-1; } else if(i==1) { sn->check_sum=(~point[i]); } else if(i==2) { sn->check_sum=(point[i])-point[6]; } else if(i==5) { sn->check_sum=(~point[i])*point[i]+12; } else if(i==6) { sn->check_sum=(~point[i])*point[i]+48; } else { sn->check_sum=point[i]; } } }
void GenSn(const DVE_SN * sn) { sn->check_sum= GetSnCheckSum(sn); }
uint8_t CheckSnValid(uint8_t *sn) { const DVE_SN * point=(DVE_SN *)sn; uint8_t ret=0; if(GetSnCheckSum(point)!==point->check_sum) { ret=1; } } return ret;