ardupilot/libraries/AP_HAL/AnalogIn.h

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#pragma once
#include <inttypes.h>
#include "AP_HAL_Namespace.h"
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class AP_HAL::AnalogSource {
public:
virtual float read_average() = 0;
virtual float read_latest() = 0;
virtual void set_pin(uint8_t p) = 0;
// optionally allow setting of a pin that stops the device from
// reading. This is needed for sonar devices where you have more
// than one sonar, and you want to stop them interfering with each
// other. It assumes that if held low the device is stopped, if
// held high the device starts reading.
virtual void set_stop_pin(uint8_t p) = 0;
// optionally allow a settle period in milliseconds. This is only
// used if a stop pin is set. If the settle period is non-zero
// then the analog input code will wait to get a reading for that
// number of milliseconds. Note that this will slow down the
// reading of analog inputs.
virtual void set_settle_time(uint16_t settle_time_ms) = 0;
// return a voltage from 0.0 to 5.0V, scaled
// against a reference voltage
virtual float voltage_average() = 0;
// return a voltage from 0.0 to 5.0V, scaled
// against a reference voltage
virtual float voltage_latest() = 0;
// return a voltage from 0.0 to 5.0V, assuming a ratiometric
// sensor
virtual float voltage_average_ratiometric() = 0;
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};
class AP_HAL::AnalogIn {
public:
virtual void init() = 0;
virtual AP_HAL::AnalogSource* channel(int16_t n) = 0;
// board 5V rail voltage in volts
virtual float board_voltage(void) = 0;
// servo rail voltage in volts, or 0 if unknown
virtual float servorail_voltage(void) { return 0; }
// power supply status flags, see MAV_POWER_STATUS
virtual uint16_t power_status_flags(void) { return 0; }
};
#define ANALOG_INPUT_BOARD_VCC 254
#define ANALOG_INPUT_NONE 255