gp2y1010au0f_drv.h

/*
 * gp2y1010au0fdrv.h
 *
 *  Created on: 27.01.2017
 *      Author: aterstegge
 */
 
#ifndef _GP2Y1010AU0F_DRV_H_
#define _GP2Y1010AU0F_DRV_H_
 
#include "gpio_interface.h"
#include "adc_interface.h"
#include "timer_interface.h"
 
void callback_helper(void *arg);
 
class gp2y1010au0f_drv {
public:
 
    gp2y1010au0f_drv(adc_channel &adc,
                     gpio_interface &led,
                     timer_interface &timer,
                     float voltage_factor = 1.0);
 
    ~gp2y1010au0f_drv();
 
    void start_measure(uint16_t measurements,
                       void (*callback)(gp2y1010au0f_drv *));
 
    inline float get_volt() { return _volt; }
 
    inline float get_volt_min() { return _volt_min; }
 
    inline float get_volt_max() { return _volt_max; }
 
    inline float get_dust() { return _dust; }
 
private:
 
    // Delay values in us. The pre-measurement delay should be 280us according
    // to the data sheet, but the esp adc takes 90us to convert, so we align the
    // _center_ of the adc 'window' to 280us and start 50us earlier...
    static const uint16_t T = 10000;        // T is 10ms according to data sheet
    static const uint16_t DELAY = 230;      // Delay before ADC measurement
 
    void process_state();
 
    float voltage_to_dust(float VO);
 
    // HW members: ADC, LED and timer references
    adc_channel &_adc;
    gpio_interface &_ir_led;
    timer_interface &_timer;
 
    float _voltage_factor;        // factor of voltage divider
    uint32_t _raw_sum;            // sum of all raw adc values
    uint16_t _measurements;       // Number of measurements to perform
    uint16_t _counter;            // Measurement counter
    float _volt;
    float _volt_min;
    float _volt_max;
    float _dust;
 
    void (*_callback)(gp2y1010au0f_drv *);
 
    enum sensor_state_t {
        START_MEASURE, DO_MEASURE, STOP_MEASURE
    };
    sensor_state_t _state;        // The current state of the sensor
 
};
 
#endif /* SRC_DRIVER_GP2Y1010AU0FDRV_H_ */