add input_handler module

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,
+};