Reading RC Receiver Switch signal with an Arduino Zero

hey,

i stuck problem deals decoding of ppm-signals(i suppose) coming rc remote. rc transmitter model robbe futaba f-14, corresponding robbe futaba fp-r118f receiver, hooked arduino zero.

i can in fact decode pitch/roll/yaw/throttle stick signals given in seperate channels, remote control expandable multi-switch module 8 switches gets encoded onto single rc channel have decode. suspected ppm , informed myself bit, signal doesn't normal ppm me.
(attached files: pseudooscilloscopechange.png shows state of pin, returned interrupt routine, timechange.png shows time between 1 pin change; change indicates interrupt routine set change)

my code:

code: [select]



volatile unsigned long f_start_time = 0l;
volatile unsigned long f_now = 0l;
volatile unsigned long f_val = 0l;
volatile short f_values[9];
volatile int f_index = 0;
volatile boolean f = false;

int min_f = 200000;
int max_f = 0;

const int rc_functionpin = 12;

//############################################################################

void setup() {
  serial.begin(19200);
  setupinterrupts();
}

//############################################################################

void loop() {
//  serial.println(f_val);
  serial.println(f);
//  serial.print('\t');
//  serial.print(max_f);
//  serial.print('\t');
//  serial.println(min_f);
//  serial.print('\t');
//  for(int = 0; < 7; i++) {
//    serial.print(f_values[i]);
//    serial.print('\t');
//  }
//  serial.println(f_values[7]);
}

//############################################################################

void setupinterrupts() {
  pinmode(rc_functionpin, input);
  attachinterrupt(rc_functionpin, functionhandler, change);
}


void functionhandler() {
  f = !f;                                       /*f shows state of pin when interrupt set change, arduino can act oscilloscope*/
  f_now = micros();
  f_val = f_now - f_start_time;
  f_start_time = f_now;
//  
//  if(f_val >= 18000) {
//    f_index = 0;
//  }else {
//    f_values[f_index] = f_val;
//    f_index = ((f_index + 1) % 9);
//  }
}

the commented out stuff in loop() debugging various things, in functionhandler(), comments idea of parsing ppm-channels, didnt work since filled first index in array.

what correct way decode function of rc transmitter? normal ppm , kinda dumb or special? if of these cases apply, can explain mistake/give me directions work with?

any really appreciated, , feel free ask something,
thebeast

ok, record, solved it.
the reciever isn't using ppm, shifted pwm.

the new code needed 1 addition in isr:

code: [select]



volatile unsigned long f_start_time = 0l;
volatile unsigned long f_now = 0l;
volatile unsigned long f_val = 0l;
volatile short f_values[9];
volatile int f_index = 0;
volatile boolean f = false;

int min_f = 200000;
int max_f = 0;

const int rc_functionpin = 12;

//############################################################################

void setup() {
  serial.begin(19200);
  setupinterrupts();
}

//############################################################################

void loop() {
  serial.print('\t');
  serial.print(max_f);
  serial.print('\t');
  serial.println(min_f);
  serial.print('\t');
  for(int = 0; < 7; i++) {
    serial.print(f_values[i]);
    serial.print('\t');
  }
  serial.println(f_values[7]);
}

//############################################################################

void setupinterrupts() {
  pinmode(rc_functionpin, input);
  attachinterrupt(rc_functionpin, functionhandler, change);
}


void functionhandler() {
  f_now = micros();
  f_val = f_now - f_start_time;
  f_start_time = f_now;
 
  if(f_val < 1000) {
    f_index = -1;
  }else if(f_val >= 18000) {
    f_index = ((f_index + 1) % 10);
  }else {
    f_values[f_index] = f_val;
  }
}

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