Reading RC Receiver PPM Signal Using Arduino

1unsigned long int a,b,c;
2int x[15],ch1[15],ch[7],i;
3//specifing  arrays and variables to store values 
4
5void setup() {
6Serial.begin(9600);
7  pinMode(2, INPUT_PULLUP);
8  attachInterrupt(digitalPinToInterrupt(2), read_me,  FALLING);
9  // enabling interrupt at pin 2
10}
11
12void loop() {
13read_rc();
14
15Serial.print(ch[1]);Serial.print("\	");
16Serial.print(ch[2]);Serial.print("\	");
17Serial.print(ch[3]);Serial.print("\	");
18Serial.print(ch[4]);Serial.print("\	");
19Serial.print(ch[5]);Serial.print("\	");
20Serial.print(ch[6]);Serial.print("\
21");
22
23delay(100);
24}
25
26
27void  read_me()  {
28 //this code reads value from RC reciever from PPM pin (Pin 2 or  3)
29 //this code gives channel values from 0-1000 values 
30 //    -: ABHILASH  :-    //
31a=micros(); //store time value a when pin value falling
32c=a-b;      //calculating  time inbetween two peaks
33b=a;        // 
34x[i]=c;     //storing 15 value in  array
35i=i+1;       if(i==15){for(int j=0;j<15;j++) {ch1[j]=x[j];}
36             i=0;}}//copy  store all values from temporary array another array after 15 reading  
37void read_rc(){
38int  i,j,k=0;
39  for(k=14;k>-1;k--){if(ch1[k]>10000){j=k;}}  //detecting separation  space 10000us in that another array                     
40  for(i=1;i<=6;i++){ch[i]=(ch1[i+j]-1000);}}     //assign 6 channel values after separation space