localhorst/lezyne-rear-light-firmware
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button press confirmation

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This commit is contained in:
Hendrik Schutter
2025-09-06 00:29:28 +02:00
parent ddd8932ffa
commit 08f348d8fe
1 changed files with 36 additions and 24 deletions
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58
main.c
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@ -20,7 +20,8 @@
/** @} */ /** @} */
#define MAIN_LOOP_SLEEP 10U // Main loop delay in ms (system tick) #define MAIN_LOOP_SLEEP 10U // Main loop delay in ms (system tick)
#define BUTTON_PRESS_DURATION 1000U // Button needs to be pressed for at least 1000ms #define BUTTON_LONG_PRESS_DURATION_MS 1000U // Long press detection threshold
#define BUTTON_IGNORE_DURATION_MS 1000U // Time that the button is ignored after a long press
/** @brief Convert milliseconds to system ticks (integer division). */ /** @brief Convert milliseconds to system ticks (integer division). */
#define MS_TO_TICKS(ms) ((ms) / MAIN_LOOP_SLEEP) #define MS_TO_TICKS(ms) ((ms) / MAIN_LOOP_SLEEP)
@ -30,7 +31,7 @@ volatile bool bLedEnabled = true;
volatile bool bBtnPressed = false; volatile bool bBtnPressed = false;
// Function forward declarations // Function forward declarations
void blinkLed(void); void blinkLed(bool resetCounters);
static inline void leds_off(void); static inline void leds_off(void);
static inline void leds_on(void); static inline void leds_on(void);
static void handleSwitch(void); static void handleSwitch(void);
@ -74,15 +75,21 @@ int main(void)
if (bLedEnabledOld != bLedEnabled) if (bLedEnabledOld != bLedEnabled)
{ {
// A long press detected --> confirm with a blink
bLedEnabledOld = bLedEnabled; bLedEnabledOld = bLedEnabled;
leds_off(); leds_off();
_delay_ms(1000); _delay_ms(BUTTON_IGNORE_DURATION_MS / 10);
leds_on();
_delay_ms(BUTTON_IGNORE_DURATION_MS / 10);
leds_off();
_delay_ms(BUTTON_IGNORE_DURATION_MS);
blinkLed(true); // reset the persistent counters
} }
else else
{ {
if ((bLedEnabled) && (!bBtnPressed)) if ((bLedEnabled) && (!bBtnPressed))
{ {
blinkLed(); blinkLed(false);
} }
} }
@ -138,7 +145,7 @@ static void handleSwitch(void)
pressTicks = 0; pressTicks = 0;
} }
if (prevPressed && pressTicks >= MS_TO_TICKS(BUTTON_PRESS_DURATION)) if (prevPressed && pressTicks >= MS_TO_TICKS(BUTTON_LONG_PRESS_DURATION_MS))
{ {
// long press detected → toggle blinking // long press detected → toggle blinking
bLedEnabled = !bLedEnabled; bLedEnabled = !bLedEnabled;
@ -150,31 +157,36 @@ static void handleSwitch(void)
/** /**
* @brief LED blink state machine (bike rear light style). * @brief LED blink state machine (bike rear light style).
* *
* Implements a "rounded" pulsing blink sequence: * Normal cycle:
* * 0: all off, wait 250 ms
* Normal cycle (~1 s total): * 2: LED 1–2 + 7–8 ON, wait 50 ms
* - Step 0: all off, wait 100 ms * 5: all off, wait 100 ms
* - Step 1: LED 1–2 + 7–8 ON, wait 100 ms * 7: LED 1–2 + 7–8 ON, wait 50 ms
* - Step 2: all LEDs ON, wait 200 ms * 10: all off, wait 250 ms
* - Step 3: only LED 1–2 ON, wait 100 ms * 12: LED 3–6 ON, wait 50 ms
* - Step 4: all off, wait 400 ms → restart * 14: all off, wait 100 ms
* * 16: LED 3–6 ON, wait 50 ms
* Special behavior: * 18: all off, wait 250 ms → restart
* - Every 3rd cycle, after step 4, all LEDs are switched on for 300 ms. * Special: every 3rd cycle, all LEDs ON for 250 ms
*
* Timing is based on @ref MAIN_LOOP_SLEEP ticks.
*/ */
void blinkLed(void) void blinkLed(bool resetCounters)
{ {
// --- precomputed constants (compile-time) --- // --- precomputed constants ---
const uint8_t T50 = MS_TO_TICKS(50); ///< 50 ms in ticks const uint8_t T50 = MS_TO_TICKS(50); ///< 50 ms in ticks
const uint8_t T100 = MS_TO_TICKS(100); ///< 100 ms in ticks const uint8_t T100 = MS_TO_TICKS(100); ///< 100 ms in ticks
const uint8_t T250 = MS_TO_TICKS(250); ///< 250 ms in ticks const uint8_t T250 = MS_TO_TICKS(250); ///< 250 ms in ticks
// --- persistent state --- // --- persistent state ---
static uint16_t counter = 0; ///< counts ticks for current state static uint16_t counter = 0; ///< ticks for current state
static uint8_t state = 0; ///< current step in the sequence static uint8_t state = 2; ///< start with first LEDs-on state
static uint8_t cycle = 0; ///< cycle counter (0–2) static uint8_t cycle = 0; ///< cycle counter
if (resetCounters)
{
counter = 0;
state = 12; // start with LEDs on
cycle = 0;
}
counter++; counter++;