Reading RC channels from mega 2560 - arduino

Question

I'm trying to read signals from fs-ct6b using Mega 2560 with this code:
int val;
int ch_in[6] = {2, 3, 4, 5, 6, 7};
int ch_out[6] = {8, 9, 10, 11, 12, 13};
void setup() {
for (int i = 0; i < 6; i++){
pinMode(ch_in[i], INPUT);
pinMode(ch_out[i], OUTPUT);
}
Serial.begin(9600);
}
void loop() {
for (int i = 0; i < 6; i++){
val = pulseIn(ch_in[i], HIGH);
Serial.print("Ch #");
Serial.print(i + 1, DEC);
Serial.print(" = ");
Serial.println(val, DEC);
};
Serial.println("\n");
delay(100);
}
but the received values are grater by 300-400 than I expect. For example throttle values changes between 1418 and 2442, but the same RC connected to my quad in Mission Planner\multiwii GUI gives ~1100 - 1950. What is my problem?

Answer 1

This version of pulseIn() works fine:
ulong pulseIn(int pin, int timeout){
ulong uStart, uEnd, _timer, _pass;
_timer = micros();
while (HIGH == digitalRead(pin)){
_pass = micros() - _timer;
if (_pass > TIME_OUT)
return 0;
};
while (LOW == digitalRead(pin)){
_pass = micros() - _timer;
if (_pass > TIME_OUT)
return 0;
};
uStart = micros();
while (HIGH == digitalRead(pin)){
_pass = micros() - _timer;
if (_pass > TIME_OUT)
return 0;
};
uEnd = micros();
return uEnd - uStart;
}
The other way is to use interrupts as shown here:
http://rcarduino.blogspot.ru/2012/01/how-to-read-rc-receiver-with.html
UPD. The problem was in Arduino IDE version installed by package manager. The "original" version from arduino.cc works fine.