twr_hc_sr04.h

#ifndef _TWR_HC_SR04_H
#define _TWR_HC_SR04_H
 
#include <twr_tick.h>
#include <twr_gpio.h>
#include <twr_scheduler.h>
 
 
typedef enum
{
    TWR_HC_SR04_EVENT_ERROR = 0,
 
    TWR_HC_SR04_EVENT_UPDATE = 1
 
} twr_hc_sr04_event_t;
 
typedef enum
{
    TWR_HC_SR04_ECHO_P5 = TWR_GPIO_P5,
    TWR_HC_SR04_ECHO_P8 = TWR_GPIO_P8,
 
} twr_hc_sr04_echo_t;
 
 
 
typedef struct twr_hc_sr04_t twr_hc_sr04_t;
 
 
struct twr_hc_sr04_t
{
    twr_scheduler_task_id_t _task_id_interval;
    twr_scheduler_task_id_t _task_id_notify;
    void (*_event_handler)(twr_hc_sr04_t *, twr_hc_sr04_event_t, void *);
    void *_event_param;
    twr_tick_t _update_interval;
    bool _measurement_active;
    bool _measurement_valid;
    uint16_t _echo_duration;
    twr_hc_sr04_echo_t _echo;
    twr_gpio_channel_t _trig;
};
 
 
 
void twr_hc_sr04_init_sensor_module(twr_hc_sr04_t *self);
 
 
void twr_hc_sr04_init(twr_hc_sr04_t *self, twr_gpio_channel_t trig, twr_hc_sr04_echo_t echo);
 
 
void twr_hc_sr04_set_event_handler(twr_hc_sr04_t *self, void (*event_handler)(twr_hc_sr04_t *, twr_hc_sr04_event_t, void *), void *event_param);
 
 
void twr_hc_sr04_set_update_interval(twr_hc_sr04_t *self, twr_tick_t interval);
 
 
bool twr_hc_sr04_measure(twr_hc_sr04_t *self);
 
 
bool twr_hc_sr04_get_distance_millimeter(twr_hc_sr04_t *self, float *millimeter);
 
 
#endif // _TWR_HC_SR04_H