ardupilot/ArduCopter/control_acro.pde

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/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
/*
* control_acro.pde - init and run calls for acro flight mode
*/
// acro_init - initialise acro controller
static bool acro_init(bool ignore_checks)
{
// always successfully enter acro
return true;
}
// acro_run - runs the acro controller
// should be called at 100hz or more
static void acro_run()
{
float target_roll, target_pitch, target_yaw;
int16_t pilot_throttle_scaled;
// if motors not running reset angle targets
if(!motors.armed() || g.rc_3.control_in <= 0) {
attitude_control.relax_bf_rate_controller();
attitude_control.set_yaw_target_to_current_heading();
attitude_control.set_throttle_out(0, false);
return;
}
// convert the input to the desired body frame rate
get_pilot_desired_angle_rates(g.rc_1.control_in, g.rc_2.control_in, g.rc_4.control_in, target_roll, target_pitch, target_yaw);
// get pilot's desired throttle
pilot_throttle_scaled = get_pilot_desired_throttle(g.rc_3.control_in);
// run attitude controller
attitude_control.rate_bf_roll_pitch_yaw(target_roll, target_pitch, target_yaw);
// output pilot's throttle without angle boost
attitude_control.set_throttle_out(pilot_throttle_scaled, false);
}
// get_pilot_desired_angle_rates - transform pilot's roll pitch and yaw input into a desired lean angle rates
// returns desired angle rates in centi-degrees-per-second
static void get_pilot_desired_angle_rates(int16_t roll_in, int16_t pitch_in, int16_t yaw_in, float &roll_out, float &pitch_out, float &yaw_out)
{
// Calculate trainer mode earth frame rate command for roll
float rate_limit;
Vector3f rate_ef_level, rate_bf_level, rate_bf_request;
// calculate rate requests
rate_bf_request.x = roll_in * g.acro_rp_p;
rate_bf_request.y = pitch_in * g.acro_rp_p;
rate_bf_request.z = yaw_in * g.acro_yaw_p;
// calculate earth frame rate corrections to pull the copter back to level while in ACRO mode
if (g.acro_trainer != ACRO_TRAINER_DISABLED) {
// Calculate trainer mode earth frame rate command for roll
int32_t roll_angle = wrap_180_cd(ahrs.roll_sensor);
rate_ef_level.x = -constrain_int32(roll_angle, -ACRO_LEVEL_MAX_ANGLE, ACRO_LEVEL_MAX_ANGLE) * g.acro_balance_roll;
// Calculate trainer mode earth frame rate command for pitch
int32_t pitch_angle = wrap_180_cd(ahrs.pitch_sensor);
rate_ef_level.y = -constrain_int32(pitch_angle, -ACRO_LEVEL_MAX_ANGLE, ACRO_LEVEL_MAX_ANGLE) * g.acro_balance_pitch;
// Calculate trainer mode earth frame rate command for yaw
rate_ef_level.z = 0;
// Calculate angle limiting earth frame rate commands
if (g.acro_trainer == ACRO_TRAINER_LIMITED) {
if (roll_angle > aparm.angle_max){
rate_ef_level.x -= g.acro_balance_roll*(roll_angle-aparm.angle_max);
}else if (roll_angle < -aparm.angle_max) {
rate_ef_level.x -= g.acro_balance_roll*(roll_angle+aparm.angle_max);
}
if (pitch_angle > aparm.angle_max){
rate_ef_level.y -= g.acro_balance_pitch*(pitch_angle-aparm.angle_max);
}else if (pitch_angle < -aparm.angle_max) {
rate_ef_level.y -= g.acro_balance_pitch*(pitch_angle+aparm.angle_max);
}
}
// convert earth-frame level rates to body-frame level rates
attitude_control.frame_conversion_ef_to_bf(rate_ef_level, rate_bf_level);
// combine earth frame rate corrections with rate requests
if (g.acro_trainer == ACRO_TRAINER_LIMITED) {
rate_bf_request.x += rate_bf_level.x;
rate_bf_request.y += rate_bf_level.y;
rate_bf_request.z += rate_bf_level.z;
}else{
acro_level_mix = constrain_float(1-max(max(abs(roll_in), abs(pitch_in)), abs(yaw_in))/4500.0, 0, 1)*ahrs.cos_pitch();
// Scale leveling rates by stick input
rate_bf_level = rate_bf_level*acro_level_mix;
// Calculate rate limit to prevent change of rate through inverted
rate_limit = fabs(fabs(rate_bf_request.x)-fabs(rate_bf_level.x));
rate_bf_request.x += rate_bf_level.x;
rate_bf_request.x = constrain_float(rate_bf_request.x, -rate_limit, rate_limit);
// Calculate rate limit to prevent change of rate through inverted
rate_limit = fabs(fabs(rate_bf_request.y)-fabs(rate_bf_level.y));
rate_bf_request.y += rate_bf_level.y;
rate_bf_request.y = constrain_float(rate_bf_request.y, -rate_limit, rate_limit);
// Calculate rate limit to prevent change of rate through inverted
rate_limit = fabs(fabs(rate_bf_request.z)-fabs(rate_bf_level.z));
rate_bf_request.z += rate_bf_level.z;
rate_bf_request.z = constrain_float(rate_bf_request.z, -rate_limit, rate_limit);
}
}
// hand back rate request
roll_out = rate_bf_request.x;
pitch_out = rate_bf_request.y;
yaw_out = rate_bf_request.z;
}