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372 lines
8.8 KiB
372 lines
8.8 KiB
// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- |
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/* |
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* RC_Channel.cpp - Radio library for Arduino |
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* Code by Jason Short. DIYDrones.com |
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* |
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* This library is free software; you can redistribute it and / or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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*/ |
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#include <stdlib.h> |
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#include <math.h> |
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#include <AP_HAL.h> |
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extern const AP_HAL::HAL& hal; |
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#include <AP_Math.h> |
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#include "RC_Channel.h" |
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#define NUM_CHANNELS 8 |
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/// global array with pointers to all APM RC channels, will be used by AP_Mount |
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/// and AP_Camera classes / It points to RC input channels, both APM1 and APM2 |
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/// only have 8 input channels. |
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RC_Channel *RC_Channel::rc_ch[NUM_CHANNELS]; |
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const AP_Param::GroupInfo RC_Channel::var_info[] PROGMEM = { |
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// @Param: MIN |
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// @DisplayName: RC min PWM |
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// @Description: RC minimum PWM pulse width. Typically 1000 is lower limit, 1500 is neutral and 2000 is upper limit. |
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// @Units: ms |
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// @Range: 800 2200 |
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// @Increment: 1 |
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// @User: Advanced |
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AP_GROUPINFO("MIN", 0, RC_Channel, radio_min, 1100), |
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// @Param: TRIM |
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// @DisplayName: RC trim PWM |
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// @Description: RC trim (neutral) PWM pulse width. Typically 1000 is lower limit, 1500 is neutral and 2000 is upper limit. |
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// @Units: ms |
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// @Range: 800 2200 |
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// @Increment: 1 |
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// @User: Advanced |
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AP_GROUPINFO("TRIM", 1, RC_Channel, radio_trim, 1500), |
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// @Param: MAX |
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// @DisplayName: RC max PWM |
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// @Description: RC maximum PWM pulse width. Typically 1000 is lower limit, 1500 is neutral and 2000 is upper limit. |
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// @Units: ms |
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// @Range: 800 2200 |
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// @Increment: 1 |
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// @User: Advanced |
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AP_GROUPINFO("MAX", 2, RC_Channel, radio_max, 1900), |
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// @Param: REV |
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// @DisplayName: RC reverse |
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// @Description: Reverse servo operation. Set to 1 for normal (forward) operation. Set to -1 to reverse this channel. |
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// @Values: -1:Reversed,1:Normal |
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// @User: Advanced |
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AP_GROUPINFO("REV", 3, RC_Channel, _reverse, 1), |
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// Note: index 4 was used by the previous _dead_zone value. We |
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// changed it to 5 as dead zone values had previously been |
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// incorrectly saved, overriding user values. They were also |
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// incorrectly interpreted for the throttle on APM:Plane |
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// @Param: DZ |
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// @DisplayName: RC dead-zone |
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// @Description: dead zone around trim. |
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// @User: Advanced |
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AP_GROUPINFO("DZ", 5, RC_Channel, _dead_zone, 0), |
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AP_GROUPEND |
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}; |
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// setup the control preferences |
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void |
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RC_Channel::set_range(int16_t low, int16_t high) |
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{ |
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_type = RC_CHANNEL_TYPE_RANGE; |
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_high = high; |
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_low = low; |
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_high_out = high; |
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_low_out = low; |
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} |
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void |
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RC_Channel::set_range_out(int16_t low, int16_t high) |
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{ |
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_high_out = high; |
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_low_out = low; |
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} |
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void |
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RC_Channel::set_angle(int16_t angle) |
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{ |
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_type = RC_CHANNEL_TYPE_ANGLE; |
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_high = angle; |
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} |
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void |
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RC_Channel::set_default_dead_zone(int16_t dzone) |
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{ |
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if (!_dead_zone.load()) { |
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_dead_zone.set(abs(dzone)); |
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} |
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} |
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void |
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RC_Channel::set_reverse(bool reverse) |
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{ |
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if (reverse) _reverse = -1; |
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else _reverse = 1; |
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} |
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bool |
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RC_Channel::get_reverse(void) |
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{ |
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if (_reverse==-1) return 1; |
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else return 0; |
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} |
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void |
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RC_Channel::set_type(uint8_t t) |
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{ |
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_type = t; |
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} |
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// call after first read |
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void |
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RC_Channel::trim() |
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{ |
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radio_trim = radio_in; |
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} |
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// read input from APM_RC - create a control_in value |
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void |
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RC_Channel::set_pwm(int16_t pwm) |
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{ |
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radio_in = pwm; |
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if (_type == RC_CHANNEL_TYPE_RANGE) { |
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control_in = pwm_to_range(); |
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} else { |
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//RC_CHANNEL_TYPE_ANGLE, RC_CHANNEL_TYPE_ANGLE_RAW |
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control_in = pwm_to_angle(); |
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} |
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} |
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// read input from APM_RC - create a control_in value, but use a |
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// zero value for the dead zone. When done this way the control_in |
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// value can be used as servo_out to give the same output as input |
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void |
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RC_Channel::set_pwm_no_deadzone(int16_t pwm) |
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{ |
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radio_in = pwm; |
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if (_type == RC_CHANNEL_TYPE_RANGE) { |
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control_in = pwm_to_range_dz(0); |
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} else { |
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//RC_CHANNEL_ANGLE, RC_CHANNEL_ANGLE_RAW |
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control_in = pwm_to_angle_dz(0); |
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} |
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} |
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int16_t |
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RC_Channel::control_mix(float value) |
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{ |
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return (1 - abs(control_in / _high)) * value + control_in; |
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} |
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// are we below a threshold? |
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bool |
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RC_Channel::get_failsafe(void) |
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{ |
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return (radio_in < (radio_min - 50)); |
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} |
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// returns just the PWM without the offset from radio_min |
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void |
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RC_Channel::calc_pwm(void) |
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{ |
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if(_type == RC_CHANNEL_TYPE_RANGE) { |
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pwm_out = range_to_pwm(); |
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radio_out = (_reverse >= 0) ? (radio_min + pwm_out) : (radio_max - pwm_out); |
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}else if(_type == RC_CHANNEL_TYPE_ANGLE_RAW) { |
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pwm_out = (float)servo_out * 0.1f; |
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radio_out = (pwm_out * _reverse) + radio_trim; |
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}else{ // RC_CHANNEL_TYPE_ANGLE |
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pwm_out = angle_to_pwm(); |
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radio_out = pwm_out + radio_trim; |
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} |
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radio_out = constrain_int16(radio_out, radio_min.get(), radio_max.get()); |
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} |
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// ------------------------------------------ |
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void |
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RC_Channel::load_eeprom(void) |
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{ |
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radio_min.load(); |
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radio_trim.load(); |
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radio_max.load(); |
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_reverse.load(); |
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_dead_zone.load(); |
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} |
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void |
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RC_Channel::save_eeprom(void) |
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{ |
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radio_min.save(); |
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radio_trim.save(); |
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radio_max.save(); |
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_reverse.save(); |
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_dead_zone.save(); |
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} |
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// ------------------------------------------ |
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void |
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RC_Channel::zero_min_max() |
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{ |
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radio_min = radio_max = radio_in; |
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} |
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void |
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RC_Channel::update_min_max() |
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{ |
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radio_min = min(radio_min.get(), radio_in); |
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radio_max = max(radio_max.get(), radio_in); |
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} |
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/* |
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return an "angle in centidegrees" (normally -4500 to 4500) from |
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the current radio_in value using the specified dead_zone |
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*/ |
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int16_t |
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RC_Channel::pwm_to_angle_dz(uint16_t dead_zone) |
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{ |
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int16_t radio_trim_high = radio_trim + dead_zone; |
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int16_t radio_trim_low = radio_trim - dead_zone; |
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// prevent div by 0 |
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if ((radio_trim_low - radio_min) == 0 || (radio_max - radio_trim_high) == 0) |
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return 0; |
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if(radio_in > radio_trim_high) { |
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return _reverse * ((long)_high * (long)(radio_in - radio_trim_high)) / (long)(radio_max - radio_trim_high); |
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}else if(radio_in < radio_trim_low) { |
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return _reverse * ((long)_high * (long)(radio_in - radio_trim_low)) / (long)(radio_trim_low - radio_min); |
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}else |
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return 0; |
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} |
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/* |
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return an "angle in centidegrees" (normally -4500 to 4500) from |
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the current radio_in value |
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*/ |
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int16_t |
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RC_Channel::pwm_to_angle() |
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{ |
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return pwm_to_angle_dz(_dead_zone); |
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} |
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int16_t |
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RC_Channel::angle_to_pwm() |
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{ |
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if((servo_out * _reverse) > 0) |
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return _reverse * ((long)servo_out * (long)(radio_max - radio_trim)) / (long)_high; |
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else |
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return _reverse * ((long)servo_out * (long)(radio_trim - radio_min)) / (long)_high; |
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} |
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/* |
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convert a pulse width modulation value to a value in the configured |
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range, using the specified deadzone |
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*/ |
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int16_t |
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RC_Channel::pwm_to_range_dz(uint16_t dead_zone) |
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{ |
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int16_t r_in = constrain_int16(radio_in, radio_min.get(), radio_max.get()); |
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if (_reverse == -1) { |
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r_in = radio_max.get() - (r_in - radio_min.get()); |
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} |
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int16_t radio_trim_low = radio_min + dead_zone; |
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if (r_in > radio_trim_low) |
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return (_low + ((long)(_high - _low) * (long)(r_in - radio_trim_low)) / (long)(radio_max - radio_trim_low)); |
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else if (dead_zone > 0) |
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return 0; |
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else |
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return _low; |
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} |
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/* |
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convert a pulse width modulation value to a value in the configured |
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range |
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*/ |
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int16_t |
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RC_Channel::pwm_to_range() |
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{ |
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return pwm_to_range_dz(_dead_zone); |
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} |
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int16_t |
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RC_Channel::range_to_pwm() |
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{ |
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return ((long)(servo_out - _low_out) * (long)(radio_max - radio_min)) / (long)(_high_out - _low_out); |
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} |
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// ------------------------------------------ |
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float |
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RC_Channel::norm_input() |
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{ |
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if(radio_in < radio_trim) |
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return _reverse * (float)(radio_in - radio_trim) / (float)(radio_trim - radio_min); |
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else |
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return _reverse * (float)(radio_in - radio_trim) / (float)(radio_max - radio_trim); |
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} |
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float |
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RC_Channel::norm_output() |
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{ |
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int16_t mid = (radio_max + radio_min) / 2; |
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float ret; |
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if(radio_out < mid) |
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ret = (float)(radio_out - mid) / (float)(mid - radio_min); |
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else |
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ret = (float)(radio_out - mid) / (float)(radio_max - mid); |
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if (_reverse == -1) { |
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ret = -ret; |
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} |
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return ret; |
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} |
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void RC_Channel::output() const |
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{ |
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hal.rcout->write(_ch_out, radio_out); |
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} |
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void RC_Channel::output_trim() const |
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{ |
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hal.rcout->write(_ch_out, radio_trim); |
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} |
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void |
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RC_Channel::input() |
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{ |
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radio_in = hal.rcin->read(_ch_out); |
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} |
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uint16_t |
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RC_Channel::read() const |
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{ |
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return hal.rcin->read(_ch_out); |
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} |
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void |
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RC_Channel::enable_out() |
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{ |
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hal.rcout->enable_ch(_ch_out); |
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}
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