2015-08-28 02:59:17 -03:00
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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
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/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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2016-02-17 21:25:47 -04:00
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#pragma once
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2015-08-28 02:59:17 -03:00
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#include <AP_HAL/AP_HAL.h>
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#include <AP_Param/AP_Param.h>
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#include <AP_Math/AP_Math.h>
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class AP_RSSI
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{
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public:
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enum RssiType {
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2015-09-16 04:23:46 -03:00
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RSSI_DISABLED = 0,
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RSSI_ANALOG_PIN = 1,
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RSSI_RC_CHANNEL_VALUE = 2
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2015-08-28 02:59:17 -03:00
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};
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2015-09-16 03:58:38 -03:00
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2015-08-28 02:59:17 -03:00
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// constructor
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AP_RSSI();
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// destructor
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~AP_RSSI(void);
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2015-09-16 03:58:38 -03:00
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2015-08-28 02:59:17 -03:00
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// Initialize the rssi object and prepare it for use
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void init();
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2015-09-16 03:58:38 -03:00
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2015-09-16 04:24:47 -03:00
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// return true if rssi reading is enabled
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bool enabled() const { return rssi_type != RSSI_DISABLED; }
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2015-08-28 02:59:17 -03:00
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// Read the receiver RSSI value as a float 0.0f - 1.0f.
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// 0.0 represents weakest signal, 1.0 represents maximum signal.
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float read_receiver_rssi();
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2015-08-28 02:59:17 -03:00
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// Read the receiver RSSI value as an 8-bit integer
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// 0 represents weakest signal, 255 represents maximum signal.
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uint8_t read_receiver_rssi_uint8();
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2015-09-16 04:23:46 -03:00
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// parameter block
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static const struct AP_Param::GroupInfo var_info[];
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2015-08-28 02:59:17 -03:00
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private:
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2015-09-16 04:23:46 -03:00
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// RSSI parameters
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AP_Int8 rssi_type; // Type of RSSI being used
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AP_Int8 rssi_analog_pin; // Analog pin RSSI value found on
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AP_Float rssi_analog_pin_range_low; // Voltage value for weakest rssi signal
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AP_Float rssi_analog_pin_range_high; // Voltage value for strongest rssi signal
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AP_Int8 rssi_channel; // allows rssi to be read from given channel as PWM value
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AP_Int16 rssi_channel_low_pwm_value; // PWM value for weakest rssi signal
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AP_Int16 rssi_channel_high_pwm_value; // PWM value for strongest rssi signal
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2015-08-28 02:59:17 -03:00
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// Analog Inputs
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// a pin for reading the receiver RSSI voltage.
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AP_HAL::AnalogSource *rssi_analog_source;
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2015-08-28 02:59:17 -03:00
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// read the RSSI value from an analog pin - returns float in range 0.0 to 1.0
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float read_pin_rssi();
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// read the RSSI value from a PWM value on a RC channel
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float read_channel_rssi();
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// Scale and constrain a float rssi value to 0.0 to 1.0 range
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float scale_and_constrain_float_rssi(float current_rssi_value, float low_rssi_range, float high_rssi_range);
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};
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