ardupilot/libraries/AP_Parachute/AP_Parachute.cpp

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#include "AP_Parachute.h"
#include <AP_Relay/AP_Relay.h>
#include <AP_Math/AP_Math.h>
#include <RC_Channel/RC_Channel.h>
#include <SRV_Channel/SRV_Channel.h>
#include <AP_Notify/AP_Notify.h>
#include <AP_HAL/AP_HAL.h>
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extern const AP_HAL::HAL& hal;
const AP_Param::GroupInfo AP_Parachute::var_info[] = {
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// @Param: ENABLED
// @DisplayName: Parachute release enabled or disabled
// @Description: Parachute release enabled or disabled
// @Values: 0:Disabled,1:Enabled
// @User: Standard
AP_GROUPINFO_FLAGS("ENABLED", 0, AP_Parachute, _enabled, 0, AP_PARAM_FLAG_ENABLE),
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// @Param: TYPE
// @DisplayName: Parachute release mechanism type (relay or servo)
// @Description: Parachute release mechanism type (relay or servo)
// @Values: 0:First Relay,1:Second Relay,2:Third Relay,3:Fourth Relay,10:Servo
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// @User: Standard
AP_GROUPINFO("TYPE", 1, AP_Parachute, _release_type, AP_PARACHUTE_TRIGGER_TYPE_RELAY_0),
// @Param: SERVO_ON
// @DisplayName: Parachute Servo ON PWM value
// @Description: Parachute Servo PWM value in microseconds when parachute is released
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// @Range: 1000 2000
// @Units: PWM
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// @Increment: 1
// @User: Standard
AP_GROUPINFO("SERVO_ON", 2, AP_Parachute, _servo_on_pwm, AP_PARACHUTE_SERVO_ON_PWM_DEFAULT),
// @Param: SERVO_OFF
// @DisplayName: Servo OFF PWM value
// @Description: Parachute Servo PWM value in microseconds when parachute is not released
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// @Range: 1000 2000
// @Units: PWM
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// @Increment: 1
// @User: Standard
AP_GROUPINFO("SERVO_OFF", 3, AP_Parachute, _servo_off_pwm, AP_PARACHUTE_SERVO_OFF_PWM_DEFAULT),
// @Param: ALT_MIN
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// @DisplayName: Parachute min altitude in meters above home
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// @Description: Parachute min altitude above home. Parachute will not be released below this altitude. 0 to disable alt check.
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// @Range: 0 32000
// @Units: m
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// @Increment: 1
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// @User: Standard
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AP_GROUPINFO("ALT_MIN", 4, AP_Parachute, _alt_min, AP_PARACHUTE_ALT_MIN_DEFAULT),
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// @Param: DELAY_MS
// @DisplayName: Parachute release delay
// @Description: Delay in millseconds between motor stop and chute release
// @Range: 0 5000
// @Units: ms
// @Increment: 1
// @User: Standard
AP_GROUPINFO("DELAY_MS", 5, AP_Parachute, _delay_ms, AP_PARACHUTE_RELEASE_DELAY_MS),
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AP_GROUPEND
};
/// enabled - enable or disable parachute release
void AP_Parachute::enabled(bool on_off)
{
_enabled = on_off;
// clear release_time
_release_time = 0;
}
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/// release - release parachute
void AP_Parachute::release()
{
// exit immediately if not enabled
if (_enabled <= 0) {
return;
}
// set release time to current system time
if (_release_time == 0) {
_release_time = AP_HAL::millis();
}
_release_initiated = true;
// update AP_Notify
AP_Notify::flags.parachute_release = 1;
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}
/// update - shuts off the trigger should be called at about 10hz
void AP_Parachute::update()
{
// exit immediately if not enabled or parachute not to be released
if (_enabled <= 0) {
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return;
}
// calc time since release
uint32_t time_diff = AP_HAL::millis() - _release_time;
uint32_t delay_ms = _delay_ms<=0 ? 0: (uint32_t)_delay_ms;
// check if we should release parachute
if ((_release_time != 0) && !_release_in_progress) {
if (time_diff >= delay_ms) {
if (_release_type == AP_PARACHUTE_TRIGGER_TYPE_SERVO) {
// move servo
SRV_Channels::set_output_pwm(SRV_Channel::k_parachute_release, _servo_on_pwm);
}else if (_release_type <= AP_PARACHUTE_TRIGGER_TYPE_RELAY_3) {
// set relay
_relay.on(_release_type);
}
_release_in_progress = true;
_released = true;
}
}else if ((_release_time == 0) || time_diff >= delay_ms + AP_PARACHUTE_RELEASE_DURATION_MS) {
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if (_release_type == AP_PARACHUTE_TRIGGER_TYPE_SERVO) {
// move servo back to off position
SRV_Channels::set_output_pwm(SRV_Channel::k_parachute_release, _servo_off_pwm);
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}else if (_release_type <= AP_PARACHUTE_TRIGGER_TYPE_RELAY_3) {
// set relay back to zero volts
_relay.off(_release_type);
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}
// reset released flag and release_time
_release_in_progress = false;
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_release_time = 0;
// update AP_Notify
AP_Notify::flags.parachute_release = 0;
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}
}