Teensyduino code to output swtich data on PPM

ppm.c

#include <PulsePosition.h>
#define PIN_PPM;
const int pin_ppm = 10;
const int pin_led = 13;
const int pin_master = 22;
PulsePositionOutput ppmOut;
int master_switch_on;
int save_state[9];

void setup() {
  pinMode(pin_led, OUTPUT);
  digitalWrite(pin_led, HIGH);
  ppmOut.begin(pin_ppm);
  master_switch_on = 0;
  // initialize the save state for the analog switches
  for(int i=0; i<9; ++i) {
    save_state[i] = analogRead(14+i);
  }
}

// calcuate PPM value to output given an analog value input
int calc_ppm(int val) {
  if (val < 300) return 1000;
  else if (val < 900) return 2000;
  else return 1500;
}

// check if the master switch has changed
// return true if so
boolean master_changed() {
  int val = analogRead(pin_master);
  if(abs(val - save_state[8]) >= 100) {
    return true;
  }
  return false;
}

// check if any slave switch has changed
// return true if so
boolean slave_changed() {
  boolean changed = false;
  for(int i=0; i<8; ++i) {
    int val = analogRead(14+i);
    if(abs(val - save_state[i]) >= 100) {
      return true;
    } 
  }
  return false;
}

void loop() {  
  if (master_switch_on == 1) {
    // master switch mode
    if(slave_changed()) {
        master_switch_on = 0;
    } else {
      int master_read=analogRead(pin_master);
      for(int i=0; i<8; ++i) {
        ppmOut.write(i+1, calc_ppm(master_read));
      }
      save_state[8]=master_read;
      delay(100);
    }
  } else {
    // slave switch mode
    if(master_changed()) {
        master_switch_on = 1;
    } else {
      for(int i=0; i<8; ++i) {
        int pin_read=analogRead(14+i);
        ppmOut.write(i+1, calc_ppm(pin_read));
        save_state[i]=pin_read;
      }
      delay(100);
    }
  }
}