ardupilot/ArduCopterMega/radio.pde

void init_rc_in()
{
	read_EEPROM_radio();		// read Radio limits
	g.rc_1.set_angle(4500);
	g.rc_2.set_angle(4500);
	g.rc_3.set_range(0,1000);
	g.rc_3.scale_output = .9;
	g.rc_4.set_angle(6000);

	g.rc_1.dead_zone = 60;		// 60 = .6 degrees
	g.rc_2.dead_zone = 60;
	g.rc_3.dead_zone = 20;
	g.rc_4.dead_zone = 500;

	g.rc_5.set_range(0,1000);
	g.rc_5.set_filter(false);
	g.rc_6.set_range(0,1000);
	g.rc_7.set_range(0,1000);
	g.rc_8.set_range(0,1000);
}

void init_rc_out()
{
	#if ARM_AT_STARTUP == 1
		motor_armed = 1;
	#endif

	APM_RC.OutputCh(CH_1, 	g.rc_3.radio_min);					// Initialization of servo outputs
	APM_RC.OutputCh(CH_2, 	g.rc_3.radio_min);
	APM_RC.OutputCh(CH_3, 	g.rc_3.radio_min);
	APM_RC.OutputCh(CH_4, 	g.rc_3.radio_min);

	APM_RC.OutputCh(CH_7,     g.rc_3.radio_min);
    APM_RC.OutputCh(CH_8,     g.rc_3.radio_min);

	APM_RC.Init();		// APM Radio initialization

	APM_RC.OutputCh(CH_1, 	g.rc_3.radio_min);					// Initialization of servo outputs
	APM_RC.OutputCh(CH_2, 	g.rc_3.radio_min);
	APM_RC.OutputCh(CH_3, 	g.rc_3.radio_min);
	APM_RC.OutputCh(CH_4, 	g.rc_3.radio_min);


	APM_RC.OutputCh(CH_7,     g.rc_3.radio_min);
    APM_RC.OutputCh(CH_8,     g.rc_3.radio_min);

}

void read_radio()
{
	g.rc_1.set_pwm(APM_RC.InputCh(CH_1));
	g.rc_2.set_pwm(APM_RC.InputCh(CH_2));
	g.rc_3.set_pwm(APM_RC.InputCh(CH_3));
	g.rc_4.set_pwm(APM_RC.InputCh(CH_4));
	g.rc_5.set_pwm(APM_RC.InputCh(CH_5));
	g.rc_6.set_pwm(APM_RC.InputCh(CH_6));
	g.rc_7.set_pwm(APM_RC.InputCh(CH_7));
	g.rc_8.set_pwm(APM_RC.InputCh(CH_8));
	//Serial.printf_P(PSTR("OUT 1: %d\t2: %d\t3: %d\t4: %d \n"), g.rc_1.control_in, g.rc_2.control_in, g.rc_3.control_in, g.rc_4.control_in);
}

/*
void throttle_failsafe(uint16_t pwm)
{
	if(g.throttle_fs_enabled == 0)
		return;

	//check for failsafe and debounce funky reads
	// ------------------------------------------
	if (pwm < g.throttle_fs_value){
		// we detect a failsafe from radio
		// throttle has dropped below the mark
		failsafeCounter++;
		if (failsafeCounter == 9){
			SendDebug("MSG FS ON ");
			SendDebugln(pwm, DEC);
		}else if(failsafeCounter == 10) {
			ch3_failsafe = true;
			//set_failsafe(true);
			//failsafeCounter = 10;
		}else if (failsafeCounter > 10){
			failsafeCounter = 11;
		}

	}else if(failsafeCounter > 0){
		// we are no longer in failsafe condition
		// but we need to recover quickly
		failsafeCounter--;
		if (failsafeCounter > 3){
			failsafeCounter = 3;
		}
		if (failsafeCounter == 1){
			SendDebug("MSG FS OFF ");
			SendDebugln(pwm, DEC);
		}else if(failsafeCounter == 0) {
			ch3_failsafe = false;
			//set_failsafe(false);
			//failsafeCounter = -1;
		}else if (failsafeCounter <0){
			failsafeCounter = -1;
		}
	}
}
*/

void trim_radio()
{
	for (byte i = 0; i < 30; i++){
		read_radio();
	}

	g.rc_1.trim();	// roll
	g.rc_2.trim();	// pitch
	g.rc_4.trim();	// yaw

	g.rc_1.save_eeprom();
	g.rc_2.save_eeprom();
	g.rc_4.save_eeprom();
}

void trim_yaw()
{
	for (byte i = 0; i < 30; i++){
		read_radio();
	}
	g.rc_4.trim();	// yaw
}