From f9cd3be74eb47869f7aff5f5d70813bc2230525a Mon Sep 17 00:00:00 2001
From: bartool <bartoolina@gmail.com>
Date: Thu, 29 May 2025 18:53:28 +0200
Subject: [PATCH] add input_handler module

---
 src/input_handler.c | 74 +++++++++++++++++++++++++++++++++++++++++++++
 src/input_handler.h | 46 ++++++++++++++++++++++++++++
 2 files changed, 120 insertions(+)
 create mode 100644 src/input_handler.c
 create mode 100644 src/input_handler.h

diff --git a/src/input_handler.c b/src/input_handler.c
new file mode 100644
index 0000000..dcff77e
--- /dev/null
+++ b/src/input_handler.c
@@ -0,0 +1,74 @@
+#include <avr/io.h>
+#include "input_handler.h"
+#include "timer_counter.h"
+
+const ButtonRoutine_t button_routine[MAX_STATE];
+
+void buttonHandler(ButtonKey_t *key)
+{
+    button_routine[key->state](key);
+}
+
+static inline GPIO_PinState getPinState(ButtonKey_t *key)
+{
+    // Read the pin state from the register
+    return (*(key->instance.pin_register) & (1 << key->instance.pin_number)) ? GPIO_PIN_SET : GPIO_PIN_RESET;
+}
+
+static void buttonIdleRoutine(ButtonKey_t *key)
+{
+    if (getPinState(key) == key->active_state)
+    {
+        key->state = DEBOUNCE;
+        key->last_tick = ticks100us();
+    }
+}
+
+static void buttonActiveRoutine(ButtonKey_t *key)
+{
+    if (getPinState(key) != key->active_state)
+    {
+        key->state = DEBOUNCE;
+        key->last_tick = ticks100us();
+    }
+}
+
+static void buttonDebounceRoutine(ButtonKey_t *key)
+{
+    // Read the current pin state
+    GPIO_PinState pin_now = getPinState(key);
+    ButtonState_t new_state = (pin_now == key->active_state) ? ACTIVE : IDLE;
+
+    // Check if debounce time has passed
+    uint16_t debounce_time = (new_state == ACTIVE) ? key->timer_debounce_on : key->timer_debounce_off;
+    if ((ticks100us() - key->last_tick) < debounce_time)
+    {
+        return; // Still in debounce period, do nothing
+    }
+
+    // If the new state is the same as the last state, we return to the previous state
+    if (new_state == key->last_state)
+    {
+        key->state = key->last_state;
+        return;
+    }
+
+    // Update the last state and current state
+    key->last_state = new_state;
+    key->state = new_state;
+
+    if (new_state == ACTIVE && key->buttonPressed)
+    {
+        key->buttonPressed(key);
+    }
+    else if (new_state == IDLE && key->buttonReleased)
+    {
+        key->buttonReleased(key);
+    }
+}
+
+const ButtonRoutine_t button_routine[MAX_STATE] = {
+    buttonIdleRoutine,
+    buttonDebounceRoutine,
+    buttonActiveRoutine,
+};
\ No newline at end of file
diff --git a/src/input_handler.h b/src/input_handler.h
new file mode 100644
index 0000000..ea1c2fd
--- /dev/null
+++ b/src/input_handler.h
@@ -0,0 +1,46 @@
+#pragma once
+
+typedef enum
+{
+    GPIO_PIN_RESET = 0,
+    GPIO_PIN_SET
+} GPIO_PinState;
+
+typedef enum
+{
+    IDLE = 0,
+    DEBOUNCE,
+    ACTIVE,
+    MAX_STATE
+} ButtonState_t;
+
+typedef struct
+{
+    uint8_t id;
+    volatile uint8_t *const pin_register; // Pointer to the port register
+    const uint8_t pin_number;             // Pin number
+} GpioPinConfig;
+
+// Struct for button
+typedef struct ButtonKey ButtonKey_t;
+typedef void (*buttonPressed_t)(ButtonKey_t *key);
+
+struct ButtonKey
+{
+    GpioPinConfig instance;   // Button GPIO pin configuration
+    ButtonState_t state;      // Button current state (IDLE, DEBOUNCE, ACTIVE)
+    ButtonState_t last_state; // Button last state (IDLE, ACTIVE)
+
+    GPIO_PinState active_state; // The state when the button is active (pressed)
+
+    uint8_t last_tick;          // Last remembered time before steps
+    uint8_t timer_debounce_on;  // Fixed, settable time for debounce timer
+    uint8_t timer_debounce_off; // Fixed, settable time for debounce timer
+
+    buttonPressed_t buttonReleased; // A callback for button released
+    buttonPressed_t buttonPressed;  // A callback for button pressed
+};
+
+typedef void (*ButtonRoutine_t)(ButtonKey_t *);
+
+void buttonHandler(ButtonKey_t *key);
\ No newline at end of file