ardupilot/ArduCopter/heli.pde

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/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
#if FRAME_CONFIG == HELI_FRAME
#define HELI_SERVO_AVERAGING_DIGITAL 0 // 250Hz
#define HELI_SERVO_AVERAGING_ANALOG 2 // 125Hz
static int heli_manual_override = false;
// heli_servo_averaging:
// 0 or 1 = no averaging, 250hz
// 2 = average two samples, 125hz
// 3 = averaging three samples = 83.3 hz
// 4 = averaging four samples = 62.5 hz
// 5 = averaging 5 samples = 50hz
// digital = 0 / 250hz, analog = 2 / 83.3
static void heli_init_swash()
{
int i;
int tilt_max[CH_3+1];
int total_tilt_max = 0;
// swash servo initialisation
g.heli_servo_1.set_range(0,1000);
g.heli_servo_2.set_range(0,1000);
g.heli_servo_3.set_range(0,1000);
g.heli_servo_4.set_angle(4500);
// pitch factors
heli_pitchFactor[CH_1] = cos(radians(g.heli_servo1_pos));
heli_pitchFactor[CH_2] = cos(radians(g.heli_servo2_pos));
heli_pitchFactor[CH_3] = cos(radians(g.heli_servo3_pos));
// roll factors
heli_rollFactor[CH_1] = cos(radians(g.heli_servo1_pos + 90));
heli_rollFactor[CH_2] = cos(radians(g.heli_servo2_pos + 90));
heli_rollFactor[CH_3] = cos(radians(g.heli_servo3_pos + 90));
// collective min / max
total_tilt_max = 0;
for( i=CH_1; i<=CH_3; i++ ) {
tilt_max[i] = max(abs(heli_rollFactor[i]*g.heli_roll_max), abs(heli_pitchFactor[i]*g.heli_pitch_max))/100;
total_tilt_max = max(total_tilt_max,tilt_max[i]);
}
// servo min/max values - or should I use set_range?
g.heli_servo_1.radio_min = g.heli_coll_min - tilt_max[CH_1];
g.heli_servo_1.radio_max = g.heli_coll_max + tilt_max[CH_1];
g.heli_servo_2.radio_min = g.heli_coll_min - tilt_max[CH_2];
g.heli_servo_2.radio_max = g.heli_coll_max + tilt_max[CH_2];
g.heli_servo_3.radio_min = g.heli_coll_min - tilt_max[CH_3];
g.heli_servo_3.radio_max = g.heli_coll_max + tilt_max[CH_3];
// reset the servo averaging
for( i=0; i<=3; i++ )
heli_servo_out[i] = 0;
// double check heli_servo_averaging is reasonable
if( g.heli_servo_averaging < 0 || g.heli_servo_averaging < 0 > 5 ) {
g.heli_servo_averaging = 0;
g.heli_servo_averaging.save();
}
}
static void heli_move_servos_to_mid()
{
heli_move_swash(0,0,1500,0);
}
//
// heli_move_swash - moves swash plate to attitude of parameters passed in
// - expected ranges:
// roll : -4500 ~ 4500
// pitch: -4500 ~ 4500
// collective: 1000 ~ 2000
// yaw: -4500 ~ 4500
//
static void heli_move_swash(int roll_out, int pitch_out, int coll_out, int yaw_out)
{
// ensure values are acceptable:
roll_out = constrain(roll_out, (int)-g.heli_roll_max, (int)g.heli_roll_max);
pitch_out = constrain(pitch_out, (int)-g.heli_pitch_max, (int)g.heli_pitch_max);
coll_out = constrain(coll_out, (int)g.heli_coll_min, (int)g.heli_coll_max);
// swashplate servos
g.heli_servo_1.servo_out = (heli_rollFactor[CH_1] * roll_out + heli_pitchFactor[CH_1] * pitch_out)/10 + coll_out + (g.heli_servo_1.radio_trim-1500);
if( g.heli_servo_1.get_reverse() )
g.heli_servo_1.servo_out = 3000 - g.heli_servo_1.servo_out;
g.heli_servo_2.servo_out = (heli_rollFactor[CH_2] * roll_out + heli_pitchFactor[CH_2] * pitch_out)/10 + coll_out + (g.heli_servo_2.radio_trim-1500);
if( g.heli_servo_2.get_reverse() )
g.heli_servo_2.servo_out = 3000 - g.heli_servo_2.servo_out;
g.heli_servo_3.servo_out = (heli_rollFactor[CH_3] * roll_out + heli_pitchFactor[CH_3] * pitch_out)/10 + coll_out + (g.heli_servo_3.radio_trim-1500);
if( g.heli_servo_3.get_reverse() )
g.heli_servo_3.servo_out = 3000 - g.heli_servo_3.servo_out;
if( g.heli_servo_4.get_reverse() )
g.heli_servo_4.servo_out = -yaw_out; // should probably just use rc_4 directly like we do for a tricopter
else
g.heli_servo_4.servo_out = yaw_out;
// use servo_out to calculate pwm_out and radio_out
g.heli_servo_1.calc_pwm();
g.heli_servo_2.calc_pwm();
g.heli_servo_3.calc_pwm();
g.heli_servo_4.calc_pwm();
// add the servo values to the averaging
heli_servo_out[0] += g.heli_servo_1.servo_out;
heli_servo_out[1] += g.heli_servo_2.servo_out;
heli_servo_out[2] += g.heli_servo_3.servo_out;
heli_servo_out[3] += g.heli_servo_4.radio_out;
heli_servo_out_count++;
// is it time to move the servos?
if( heli_servo_out_count >= g.heli_servo_averaging ) {
// average the values if necessary
if( g.heli_servo_averaging >= 2 ) {
heli_servo_out[0] /= g.heli_servo_averaging;
heli_servo_out[1] /= g.heli_servo_averaging;
heli_servo_out[2] /= g.heli_servo_averaging;
heli_servo_out[3] /= g.heli_servo_averaging;
}
// actually move the servos
APM_RC.OutputCh(CH_1, heli_servo_out[0]);
APM_RC.OutputCh(CH_2, heli_servo_out[1]);
APM_RC.OutputCh(CH_3, heli_servo_out[2]);
APM_RC.OutputCh(CH_4, heli_servo_out[3]);
// output gyro value
if( g.heli_ext_gyro_enabled ) {
APM_RC.OutputCh(CH_7, g.heli_ext_gyro_gain);
}
// InstantPWM - force message to the servos
APM_RC.Force_Out0_Out1();
APM_RC.Force_Out2_Out3();
// reset the averaging
heli_servo_out_count = 0;
heli_servo_out[0] = 0;
heli_servo_out[1] = 0;
heli_servo_out[2] = 0;
heli_servo_out[3] = 0;
}
}
// these are not really motors, they're servos but we don't rename the function because it fits with the rest of the code better
static void output_motors_armed()
{
//static int counter = 0;
g.rc_1.calc_pwm();
g.rc_2.calc_pwm();
g.rc_3.calc_pwm();
g.rc_4.calc_pwm();
if( heli_manual_override ) {
// straight pass through from radio inputs to swash plate
heli_move_swash( g.rc_1.control_in, g.rc_2.control_in, g.rc_3.radio_in, g.rc_4.control_in );
}else{
// source inputs from attitude controller
heli_move_swash( g.rc_1.servo_out, g.rc_2.servo_out, g.rc_3.radio_out, g.rc_4.servo_out );
}
}
// for helis - armed or disarmed we allow servos to move
static void output_motors_disarmed()
{
if(g.rc_3.control_in > 0){
// we have pushed up the throttle, remove safety
motor_auto_armed = true;
}
output_motors_armed();
}
static void output_motor_test()
{
}
#endif // HELI_FRAME