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ardupilot/ArduPlane/radio.cpp

347 lines
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C++
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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
#include "Plane.h"
//Function that will read the radio data, limit servos and trigger a failsafe
// ----------------------------------------------------------------------------
/*
allow for runtime change of control channel ordering
*/
void Plane::set_control_channels(void)
{
if (g.rudder_only) {
// in rudder only mode the roll and rudder channels are the
// same.
channel_roll = RC_Channel::rc_channel(rcmap.yaw()-1);
} else {
channel_roll = RC_Channel::rc_channel(rcmap.roll()-1);
}
channel_pitch = RC_Channel::rc_channel(rcmap.pitch()-1);
channel_throttle = RC_Channel::rc_channel(rcmap.throttle()-1);
channel_rudder = RC_Channel::rc_channel(rcmap.yaw()-1);
// set rc channel ranges
channel_roll->set_angle(SERVO_MAX);
channel_pitch->set_angle(SERVO_MAX);
channel_rudder->set_angle(SERVO_MAX);
channel_throttle->set_range(0, 100);
if (!arming.is_armed() && arming.arming_required() == AP_Arming::YES_MIN_PWM) {
hal.rcout->set_safety_pwm(1UL<<(rcmap.throttle()-1), throttle_min());
}
// setup correct scaling for ESCs like the UAVCAN PX4ESC which
// take a proportion of speed
hal.rcout->set_esc_scaling(channel_throttle->radio_min, channel_throttle->radio_max);
}
/*
initialise RC input channels
*/
void Plane::init_rc_in()
{
// set rc dead zones
channel_roll->set_default_dead_zone(30);
channel_pitch->set_default_dead_zone(30);
channel_rudder->set_default_dead_zone(30);
channel_throttle->set_default_dead_zone(30);
}
/*
initialise RC output channels
*/
void Plane::init_rc_out()
{
channel_roll->enable_out();
channel_pitch->enable_out();
/*
change throttle trim to minimum throttle. This prevents a
configuration error where the user sets CH3_TRIM incorrectly and
the motor may start on power up
*/
channel_throttle->radio_trim = throttle_min();
if (arming.arming_required() != AP_Arming::YES_ZERO_PWM) {
channel_throttle->enable_out();
}
channel_rudder->enable_out();
update_aux();
RC_Channel_aux::enable_aux_servos();
// Initialization of servo outputs
RC_Channel::output_trim_all();
// setup PWM values to send if the FMU firmware dies
RC_Channel::setup_failsafe_trim_all();
// setup PX4 to output the min throttle when safety off if arming
// is setup for min on disarm
if (arming.arming_required() == AP_Arming::YES_MIN_PWM) {
hal.rcout->set_safety_pwm(1UL<<(rcmap.throttle()-1), throttle_min());
}
}
/*
check for pilot input on rudder stick for arming/disarming
*/
void Plane::rudder_arm_disarm_check()
{
AP_Arming::ArmingRudder arming_rudder = arming.rudder_arming();
if (arming_rudder == AP_Arming::ARMING_RUDDER_DISABLED) {
//parameter disallows rudder arming/disabling
return;
}
// if throttle is not down, then pilot cannot rudder arm/disarm
if (channel_throttle->control_in > 0) {
rudder_arm_timer = 0;
return;
}
// if not in a manual throttle mode then disallow rudder arming/disarming
if (auto_throttle_mode ) {
rudder_arm_timer = 0;
return;
}
if (!arming.is_armed()) {
// when not armed, full right rudder starts arming counter
if (channel_rudder->control_in > 4000) {
uint32_t now = millis();
if (rudder_arm_timer == 0 ||
now - rudder_arm_timer < 3000) {
if (rudder_arm_timer == 0) {
rudder_arm_timer = now;
}
} else {
//time to arm!
arm_motors(AP_Arming::RUDDER);
rudder_arm_timer = 0;
}
} else {
// not at full right rudder
rudder_arm_timer = 0;
}
} else if (arming_rudder == AP_Arming::ARMING_RUDDER_ARMDISARM && !is_flying()) {
// when armed and not flying, full left rudder starts disarming counter
if (channel_rudder->control_in < -4000) {
uint32_t now = millis();
if (rudder_arm_timer == 0 ||
now - rudder_arm_timer < 3000) {
if (rudder_arm_timer == 0) {
rudder_arm_timer = now;
}
} else {
//time to disarm!
disarm_motors();
rudder_arm_timer = 0;
}
} else {
// not at full left rudder
rudder_arm_timer = 0;
}
}
}
void Plane::read_radio()
{
if (!hal.rcin->new_input()) {
control_failsafe(channel_throttle->radio_in);
return;
}
failsafe.last_valid_rc_ms = millis();
elevon.ch1_temp = channel_roll->read();
elevon.ch2_temp = channel_pitch->read();
uint16_t pwm_roll, pwm_pitch;
if (g.mix_mode == 0) {
pwm_roll = elevon.ch1_temp;
pwm_pitch = elevon.ch2_temp;
}else{
pwm_roll = BOOL_TO_SIGN(g.reverse_elevons) * (BOOL_TO_SIGN(g.reverse_ch2_elevon) * int16_t(elevon.ch2_temp - elevon.trim2) - BOOL_TO_SIGN(g.reverse_ch1_elevon) * int16_t(elevon.ch1_temp - elevon.trim1)) / 2 + 1500;
pwm_pitch = (BOOL_TO_SIGN(g.reverse_ch2_elevon) * int16_t(elevon.ch2_temp - elevon.trim2) + BOOL_TO_SIGN(g.reverse_ch1_elevon) * int16_t(elevon.ch1_temp - elevon.trim1)) / 2 + 1500;
}
RC_Channel::set_pwm_all();
if (control_mode == TRAINING) {
// in training mode we don't want to use a deadzone, as we
// want manual pass through when not exceeding attitude limits
channel_roll->set_pwm_no_deadzone(pwm_roll);
channel_pitch->set_pwm_no_deadzone(pwm_pitch);
channel_throttle->set_pwm_no_deadzone(channel_throttle->read());
channel_rudder->set_pwm_no_deadzone(channel_rudder->read());
} else {
channel_roll->set_pwm(pwm_roll);
channel_pitch->set_pwm(pwm_pitch);
}
control_failsafe(channel_throttle->radio_in);
channel_throttle->servo_out = channel_throttle->control_in;
if (g.throttle_nudge && channel_throttle->servo_out > 50) {
float nudge = (channel_throttle->servo_out - 50) * 0.02f;
if (ahrs.airspeed_sensor_enabled()) {
airspeed_nudge_cm = (aparm.airspeed_max * 100 - g.airspeed_cruise_cm) * nudge;
} else {
throttle_nudge = (aparm.throttle_max - aparm.throttle_cruise) * nudge;
}
} else {
airspeed_nudge_cm = 0;
throttle_nudge = 0;
}
rudder_arm_disarm_check();
if (g.rudder_only != 0) {
// in rudder only mode we discard rudder input and get target
// attitude from the roll channel.
rudder_input = 0;
} else {
rudder_input = channel_rudder->control_in;
}
}
void Plane::control_failsafe(uint16_t pwm)
{
if (millis() - failsafe.last_valid_rc_ms > 1000 || rc_failsafe_active()) {
// we do not have valid RC input. Set all primary channel
// control inputs to the trim value and throttle to min
channel_roll->radio_in = channel_roll->radio_trim;
channel_pitch->radio_in = channel_pitch->radio_trim;
channel_rudder->radio_in = channel_rudder->radio_trim;
// note that we don't set channel_throttle->radio_in to radio_trim,
// as that would cause throttle failsafe to not activate
channel_roll->control_in = 0;
channel_pitch->control_in = 0;
channel_rudder->control_in = 0;
channel_throttle->control_in = 0;
}
if(g.throttle_fs_enabled == 0)
return;
if (g.throttle_fs_enabled) {
if (rc_failsafe_active()) {
// we detect a failsafe from radio
// throttle has dropped below the mark
failsafe.ch3_counter++;
if (failsafe.ch3_counter == 10) {
gcs_send_text_fmt(MAV_SEVERITY_WARNING, "MSG FS ON %u", (unsigned)pwm);
failsafe.ch3_failsafe = true;
AP_Notify::flags.failsafe_radio = true;
}
if (failsafe.ch3_counter > 10) {
failsafe.ch3_counter = 10;
}
}else if(failsafe.ch3_counter > 0) {
// we are no longer in failsafe condition
// but we need to recover quickly
failsafe.ch3_counter--;
if (failsafe.ch3_counter > 3) {
failsafe.ch3_counter = 3;
}
if (failsafe.ch3_counter == 1) {
gcs_send_text_fmt(MAV_SEVERITY_WARNING, "MSG FS OFF %u", (unsigned)pwm);
} else if(failsafe.ch3_counter == 0) {
failsafe.ch3_failsafe = false;
AP_Notify::flags.failsafe_radio = false;
}
}
}
}
void Plane::trim_control_surfaces()
{
read_radio();
int16_t trim_roll_range = (channel_roll->radio_max - channel_roll->radio_min)/5;
int16_t trim_pitch_range = (channel_pitch->radio_max - channel_pitch->radio_min)/5;
if (channel_roll->radio_in < channel_roll->radio_min+trim_roll_range ||
channel_roll->radio_in > channel_roll->radio_max-trim_roll_range ||
channel_pitch->radio_in < channel_pitch->radio_min+trim_pitch_range ||
channel_pitch->radio_in > channel_pitch->radio_max-trim_pitch_range) {
// don't trim for extreme values - if we attempt to trim so
// there is less than 20 percent range left then assume the
// sticks are not properly centered. This also prevents
// problems with starting APM with the TX off
return;
}
// Store control surface trim values
// ---------------------------------
if(g.mix_mode == 0) {
if (channel_roll->radio_in != 0) {
channel_roll->radio_trim = channel_roll->radio_in;
}
if (channel_pitch->radio_in != 0) {
channel_pitch->radio_trim = channel_pitch->radio_in;
}
// the secondary aileron/elevator is trimmed only if it has a
// corresponding transmitter input channel, which k_aileron
// doesn't have
RC_Channel_aux::set_radio_trim(RC_Channel_aux::k_aileron_with_input);
RC_Channel_aux::set_radio_trim(RC_Channel_aux::k_elevator_with_input);
} else{
if (elevon.ch1_temp != 0) {
elevon.trim1 = elevon.ch1_temp;
}
if (elevon.ch2_temp != 0) {
elevon.trim2 = elevon.ch2_temp;
}
//Recompute values here using new values for elevon1_trim and elevon2_trim
//We cannot use radio_in[CH_ROLL] and radio_in[CH_PITCH] values from read_radio() because the elevon trim values have changed
uint16_t center = 1500;
channel_roll->radio_trim = center;
channel_pitch->radio_trim = center;
}
if (channel_rudder->radio_in != 0) {
channel_rudder->radio_trim = channel_rudder->radio_in;
}
// save to eeprom
channel_roll->save_eeprom();
channel_pitch->save_eeprom();
channel_rudder->save_eeprom();
}
void Plane::trim_radio()
{
for (uint8_t y = 0; y < 30; y++) {
read_radio();
}
trim_control_surfaces();
}
/*
return true if throttle level is below throttle failsafe threshold
or RC input is invalid
*/
bool Plane::rc_failsafe_active(void)
{
if (!g.throttle_fs_enabled) {
return false;
}
if (millis() - failsafe.last_valid_rc_ms > 1000) {
// we haven't had a valid RC frame for 1 seconds
return true;
}
if (channel_throttle->get_reverse()) {
return channel_throttle->radio_in >= g.throttle_fs_value;
}
return channel_throttle->radio_in <= g.throttle_fs_value;
}
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