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63 lines
1.5 KiB
63 lines
1.5 KiB
9 years ago
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#pragma once
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#include "main.h"
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#include "utils/timebase.h"
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// Debouncer requires that you setup SysTick first.
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/** Debounced pin ID - used for state readout */
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typedef uint32_t debo_id_t;
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/** debo_id_t indicating unused slot */
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#define DEBO_PIN_NONE 0
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/**
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* @brief Initialize the debouncer.
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*
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* You have to also register the periodic task to timebase.
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*
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* @param pin_count : number of pin slots to allocate
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*/
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void debounce_init(size_t pin_count);
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/**
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* @brief 1 ms periodic callback for debouncer. Must be registered to timebase.
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*/
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void debo_periodic_task(void);
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typedef struct {
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GPIO_TypeDef *GPIOx; ///< GPIO base
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uint16_t pin; ///< pin mask
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ms_time_t debo_time; ///< debounce time in ms, 0 = default (20 ms)
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bool invert; ///< invert value read from GPIO (button to ground)
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void (*rising_cb)(void); ///< callback when the pin goes HIGH
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void (*falling_cb)(void); ///< callback when the pin goes LOW
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} debo_init_t;
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/**
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* @brief Add a pin for debouncing.
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*
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* The pin state will be checked with the configured hysteresis
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* and callbacks will be called when a state change is detected.
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*/
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debo_id_t debo_register_pin(debo_init_t *init_struct);
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/**
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* @brief Check if a pin is high
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* @param pin_id : Slot ID
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* @return true if the pin is registered and is HIGH
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*/
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bool debo_pin_state(debo_id_t pin_id);
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/**
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* @brief Remove a pin entry from the debouncer.
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* @param pin_id : Slot ID
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* @return true if task found & removed.
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*/
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bool debo_remove_pin(debo_id_t pin_id);
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