Merge branch 'main' into feature/energy-saving

Reviewed-on: #4

main.c

@@ -19,24 +19,39 @@
 
 #define MAIN_LOOP_SLEEP 50U                 // Loop period in ms
 #define BUTTON_LONG_PRESS_DURATION_MS 1000U // Long press threshold
+#define BUTTON_SHORT_PRESS_DURATION_MS 50U  // Short press threshold
 #define BUTTON_IGNORE_DURATION_MS 2000U     // Time button ignored after long press
 #define BUTTON_CONFIRMATION_BLINK_LOOPS 10U // Blink animation for confirmation
 #define BUTTON_CONFIRMATION_BLINK_DURATION_MS 50U
 
 #define MS_TO_TICKS(ms) ((ms) / MAIN_LOOP_SLEEP)
 
+typedef enum _Mode
+{
+    ANIMATION_BLINK,
+    ANIMATION_GLOW,
+    STATIC_FULL,
+    MAX_COUNT,
+} eMode;
+
 /** Global flags */
 volatile bool bLedEnabled = true;
 volatile bool bBtnPressed = false;
+volatile eMode eModeCurrent = ANIMATION_BLINK;
 
 // Forward declarations
-void blinkLed(bool resetCounters);
+ISR(PORTA_PORT_vect);
+static void software_reset(void);
+void initPWM(void);
+void setPWM_PA2(uint8_t duty);
 static inline void leds_off(void);
 static inline void leds_on(void);
 static void battery_level_indicator(void);
-static void handleSwitch(void);
-static void software_reset(void);
-ISR(PORTA_PORT_vect);
+static bool handleSwitch(void);
+static inline void switchMode(void);
+void ledAnimationBlink(bool resetCounters);
+void ledAnimationGlow(void);
+void ledStaticFull(void);
 
 /* --- Timer init: Use RTC PIT for periodic wake-up --- */
 void init_timer(void)
@@ -61,16 +76,17 @@ int main(void)
 {
     // Configure LED pins as outputs
     VPORTA.DIR = (PA1_SET_MASK | PA2_SET_MASK | PA3_SET_MASK | PA6_SET_MASK | PA7_SET_MASK);
+    initPWM();
 
     // Configure PA0 as input with pull-up
     VPORTA.DIR &= ~BUTTON_PIN_MASK;    // Input
     PORTA.PIN0CTRL = PORT_PULLUPEN_bm; // Pull-up enabled
 
-    // Ensure all LEDs off at startup
-    leds_off();
+    leds_off();                // Ensure all LEDs off at startup
     battery_level_indicator(); // TODO: Implement
 
     bool bLedEnabledOld = bLedEnabled;
+    eModeCurrent = ANIMATION_BLINK; // Set the mode to start with
 
     cli();
     init_timer();
@@ -80,7 +96,7 @@ int main(void)
 
     while (1)
     {
-        handleSwitch(); // Check switch state
+        bBtnPressed = handleSwitch(); // Check switch state
 
         // Light LEDs while button is pressed
         if (bBtnPressed)
@@ -123,7 +139,20 @@ int main(void)
         {
             if (bLedEnabled && !bBtnPressed)
             {
-                blinkLed(false); // run normal blink
+                switch (eModeCurrent)
+                {
+                case ANIMATION_BLINK:
+                    ledAnimationBlink(false); // run normal blink
+                    break;
+                case ANIMATION_GLOW:
+                    ledAnimationGlow();
+                    break;
+                case STATIC_FULL:
+                    ledStaticFull();
+                    break;
+                default:
+                    break;
+                }
             }
         }
 
@@ -133,12 +162,46 @@ int main(void)
     }
 }
 
+/**
+ * @brief Move to next mode
+ */
+static inline void switchMode(void)
+{
+    eModeCurrent = (eModeCurrent + 1) % MAX_COUNT;
+}
+
+/**
+ * @brief Init PWM for PA2
+ */
+void initPWM(void)
+{
+    // No PORTMUX needed - PA2 is WO2 by default
+
+    // TCA0 in normal mode (single slope PWM)
+    TCA0.SINGLE.CTRLB = TCA_SINGLE_CMP2EN_bm | TCA_SINGLE_WGMODE_SINGLESLOPE_gc;
+
+    // Set period for ~19.5kHz PWM (5MHz / 256 = ~19.5kHz)
+    TCA0.SINGLE.PER = 0xFF;
+
+    // Start timer with DIV1 (no prescaler)
+    TCA0.SINGLE.CTRLA = TCA_SINGLE_CLKSEL_DIV1_gc | TCA_SINGLE_ENABLE_bm;
+}
+
+/**
+ * @brief Set PWM duty cycle for PA2
+ */
+void setPWM_PA2(uint8_t duty)
+{
+    TCA0.SINGLE.CMP2 = duty;
+}
+
 /**
  * @brief Turn off all controlled LEDs (PA1, PA2, PA3)
  */
 static inline void leds_off(void)
 {
-    VPORTA.OUT &= (uint8_t) ~(PA1_SET_MASK | PA2_SET_MASK | PA3_SET_MASK);
+    VPORTA.OUT &= (uint8_t) ~(PA1_SET_MASK | PA3_SET_MASK);
+    setPWM_PA2(0U);
 }
 
 /**
@@ -146,7 +209,8 @@ static inline void leds_off(void)
  */
 static inline void leds_on(void)
 {
-    VPORTA.OUT |= (PA1_SET_MASK | PA2_SET_MASK | PA3_SET_MASK);
+    VPORTA.OUT |= (PA1_SET_MASK | PA3_SET_MASK);
+    setPWM_PA2(255U);
 }
 
 /**
@@ -161,9 +225,10 @@ static void battery_level_indicator(void)
 /**
  * @brief Handle momentary switch input on PA0
  *
- * A long press toggles ::bLedEnabled.
+ * A long press toggles bLedEnabled.
+ * A short press swiches the mode.
  */
-static void handleSwitch(void)
+static bool handleSwitch(void)
 {
     static uint16_t pressTicks = 0;  ///< Press duration counter
     static bool prevPressed = false; ///< Previous button state
@@ -172,22 +237,32 @@ static void handleSwitch(void)
 
     if (pressed)
     {
-        bBtnPressed = true;
         if (pressTicks < 0xFFFF)
             pressTicks++; // Prevent overflow
     }
     else
     {
-        bBtnPressed = false;
+        // Button released
+        if (prevPressed)
+        {
+            // Check if it was a short press (not a long press)
+            if (pressTicks >= MS_TO_TICKS(BUTTON_SHORT_PRESS_DURATION_MS) &&
+                pressTicks < MS_TO_TICKS(BUTTON_LONG_PRESS_DURATION_MS))
+            {
+                switchMode();
+            }
+        }
+
         pressTicks = 0;
     }
 
-    if (prevPressed && pressTicks >= MS_TO_TICKS(BUTTON_LONG_PRESS_DURATION_MS))
+    if (pressed && pressTicks >= MS_TO_TICKS(BUTTON_LONG_PRESS_DURATION_MS))
     {
         bLedEnabled = !bLedEnabled; // Toggle LED blinking
     }
 
     prevPressed = pressed;
+    return pressed;
 }
 
 /**
@@ -231,7 +306,7 @@ ISR(PORTA_PORT_vect)
  *   18: all off, wait 250 ms → restart
  * Special: every 3rd cycle, all LEDs ON for 250 ms
  */
-void blinkLed(bool resetCounters)
+void ledAnimationBlink(bool resetCounters)
 {
     const uint8_t T50 = MS_TO_TICKS(50);
     const uint8_t T100 = MS_TO_TICKS(100);
@@ -298,7 +373,7 @@ void blinkLed(bool resetCounters)
         break;
 
     case 12: // LED 3–6 on, wait 50 ms
-        VPORTA.OUT |= PA2_SET_MASK;
+        setPWM_PA2(255U);
         if (counter >= T50)
         {
             counter = 0;
@@ -316,7 +391,7 @@ void blinkLed(bool resetCounters)
         break;
 
     case 16: // LED 3–6 on, wait 50 ms
-        VPORTA.OUT |= PA2_SET_MASK;
+        setPWM_PA2(255U);
         if (counter >= T50)
         {
             counter = 0;
@@ -342,7 +417,7 @@ void blinkLed(bool resetCounters)
         break;
 
     case 20: // special: all LEDs on for 250 ms
-        VPORTA.OUT |= (PA1_SET_MASK | PA2_SET_MASK | PA3_SET_MASK);
+        leds_on();
         if (counter >= T250)
         {
             counter = 0;
@@ -351,3 +426,38 @@ void blinkLed(bool resetCounters)
         break;
     }
 }
+
+/**
+ * @brief All LEDs with static full power
+ */
+void ledStaticFull(void)
+{
+    leds_on();
+}
+
+/**
+ * @brief Inner LEDs with glow animation
+ */
+void ledAnimationGlow(void)
+{
+    static uint8_t brightness = 0;
+    static int8_t direction = 1;
+
+    // Update brightness level every call (10ms)
+    brightness += direction;
+
+    // Reverse direction at limits
+    if (brightness >= 100U)
+    {
+        brightness = 100U;
+        direction = -1;
+    }
+    else if (brightness == 10U)
+    {
+        brightness = 10U;
+        direction = 1;
+    }
+
+    // Apply PWM brightness to LED 3-6
+    setPWM_PA2(brightness * 255 / 100); // Scale 0-100 to 0-255
+}