61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
#ifndef __EVENTS_H
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#define __EVENTS_H
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#include "stm32g441xx.h"
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#include <stdint.h>
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typedef enum {
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BTN_PRESS_PREV,
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BTN_PRESS_R2D,
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BTN_PRESS_OK,
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BTN_PRESS_NEXT
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} ButtonPressEvent;
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typedef enum { ENC0, ENC1 } Encoder;
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typedef enum { ENC_CHANGE_INC, ENC_CHANGE_DEC } EncoderChangeDirection;
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typedef struct {
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Encoder encoder;
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EncoderChangeDirection dir;
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} EncoderChangeEvent;
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typedef enum { EV_BTN_PRESS, EV_ENC_CHANGE } EventType;
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typedef struct {
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EventType type;
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union {
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ButtonPressEvent btn_press;
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EncoderChangeEvent enc_change;
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};
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} Event;
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#define EVENT_QUEUE_SIZE 32
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typedef struct {
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Event ring_buffer[EVENT_QUEUE_SIZE];
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uint16_t read_idx;
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uint16_t write_idx;
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} EventQueue;
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/**
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* @brief Push an event to the back of the queue.
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*
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* The event is deep-copied to the queue, so it can be deallocated after the
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* call is complete.
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*/
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void event_push(Event* ev);
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/**
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* @brief Pop an event from the start of the queue.
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*
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* The value in the queue may be overwritten with the next event_push() call.
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* Since that call can happen in an interrupt, i.e. is probably out of control
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* of the event_pop() caller, we return by value here.
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*/
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Event event_pop();
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uint16_t event_num_pending();
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uint16_t event_num_free();
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void handle_events();
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#endif // __EVENTS_H
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