DSMX channels list for Frequency Shift Hopping

#include <stdio.h>
/*
  DSMX channels list for Frequency Shift Hopping
  math by Alexandr Alexandrov
  code by Sergey Gimaev
  some function (like RadioSetFrequency) from Cypress old assember lib for CYRF transivers
  they used in OrangeRX DSM2 6 channel and AR6110 clone receiver
*/

int main(void){
unsigned int manufacturerID = 0x92C65809;//inverted 0x6D39A7F6;
// manufacturerID - this is that we see in the first 4 bytes of BIND packet
unsigned int calc;
unsigned int channel;
int c = 0, k, part1 = 8, part2 = 7, part3 = 8, flag = 0;
unsigned char channel_list[23];

    for(k = 0; k < 23; k++){
        channel_list[k] = 0xFF; //init channel list
    }

    calc = manufacturerID; //init randomize function
    do{
        calc *= 0x0019660D; //randomize function
        calc += 0x3C6EF35F; //from wiki, liniux, gcc, etc

        channel = calc >> 8;
        channel = channel % 0x49;

/* 1. If the 4-th byte of ManufacturerID - is even ("0" in the low-bit), then the channel
should be even (or odd channel for odd 4-th byte of ManufacturerID).
If it's not - continue (generate at calc the next number.) */
//i need to compare last bit in manufacturerID and last bit in channel for both even/odd

        if((unsigned char)(channel & 1) == (unsigned char)(manufacturerID & 1)){

/* 2. If the channel matches with any of the already obtained channel numbers
in the array, then continue */

            for(k = 0; k < 23; k++){
                if(channel_list[k] == (channel + 3)){flag = 1; k = 0xFF;}
                else    flag = 0;
            }
            if(flag == 0){
                flag = 1;

/* 3. Check to which subband the channel is related (0 .. 24, 25 .. 48 or 49 .. 72).
At the beginning of the work - set 3 counters (for each sub-band) and set them to 8, 7 and 8
(7 - at the counter for subband 25 .. 48). In which sub-band is channel - check to see 
if counter is not equal 0. If it's equal 0 - continue */
                if(channel < 25){
                    if(part1){
                        part1--;
                        flag = 0;
                    }
                }else{
                    if(channel < 49){
                        if(part2){
                            part2--;
                            flag = 0;
                        }
                    }else {
                        if(part3){
                            part3--;
                            flag = 0;
                        }
                    }
                }
                if(flag == 0){
/* Procedure returns, then add to that the 4 (as opposed to 2 for DSM2),
and with it will call RadioSetFrequency, which will subtract another 1, and will write it to the transceiver. */
//i don`t use Cypress lib, write my self to CYRF. therefore i need +3
                    channel_list[c] = channel + 3; //therefore +3
                    printf ("0x%.2x ", channel + 3);
                    c++;
                }
            }
        }

    }while(c < 23);
    return 7;
}