localhorst/lezyne-rear-light-firmware
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hw pwm is shit

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This commit is contained in:
Hendrik Schutter
2025-11-08 23:07:29 +01:00
parent f300ce2386
commit 0e5b6587a7
1 changed files with 56 additions and 37 deletions
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93
main.c
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@ -44,11 +44,15 @@ volatile eMode eModeCurrent = ANIMATION_BLINK;
// Forward declarations
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 bool handleSwitch(void);
static inline void toggleMode(void);
static inline void switchMode(void);
void ledAnimationBlink(bool resetCounters);
void ledAnimationGlow(void);
void ledStaticFull(void);
@ -59,7 +63,8 @@ void ledStaticFull(void);
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);
VPORTA.DIR = (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
@ -140,17 +145,42 @@ int main(void)
/**
* @brief Move to next mode
*/
static inline void toggleMode(void)
static inline void switchMode(void)
{
eModeCurrent = (eModeCurrent + 1) % MAX_COUNT;
}
void initPWM(void)
{
// Configure PA2 as output
PORTA.DIRSET = PIN2_bm;
// Remap TCA0 WO0 to alternative pin (PA2)
// Check datasheet for correct PORTMUX bit - this is typically:
PORTMUX.CTRLC = PORTMUX_TCA00_bm; // or similar bit to route WO0 to PA2
// TCA0 in normal mode (single slope PWM)
TCA0.SINGLE.CTRLB = TCA_SINGLE_CMP0EN_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;
}
void setPWM_PA2(uint8_t duty)
{
TCA0.SINGLE.CMP0 = 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);
}
/**
@ -158,7 +188,8 @@ 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);
}
/**
@ -173,7 +204,8 @@ 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 bool handleSwitch(void)
{
@ -196,7 +228,7 @@ static bool handleSwitch(void)
if (pressTicks >= MS_TO_TICKS(BUTTON_SHORT_PRESS_DURATION_MS) &&
pressTicks < MS_TO_TICKS(BUTTON_LONG_PRESS_DURATION_MS))
{
toggleMode();
switchMode();
}
}
@ -320,7 +352,7 @@ void ledAnimationBlink(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;
@ -338,7 +370,7 @@ void ledAnimationBlink(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;
@ -364,7 +396,7 @@ void ledAnimationBlink(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;
@ -383,41 +415,28 @@ void ledStaticFull(void)
}
/**
* @brief Outer LEDs with glow animation
* @brief Inner LEDs with glow animation
*/
void ledAnimationGlow(void)
{
static uint8_t brightness = 0;
static int8_t direction = 1;
static uint8_t pwm_counter = 0;
pwm_counter++;
// Update brightness level every call (10ms)
brightness += direction;
if (pwm_counter >= 100)
// Reverse direction at limits
if (brightness >= 100)
{
pwm_counter = 0;
// Update brightness level
brightness += direction;
if (brightness >= 100)
{
brightness = 100;
direction = -1;
}
else if (brightness == 0)
{
direction = 1;
}
brightness = 100;
direction = -1;
}
else if (brightness == 0)
{
brightness = 0;
direction = 1;
}
// Software PWM: compare pwm_counter with brightness
if (pwm_counter < brightness)
{
VPORTA.OUT |= (PA1_SET_MASK | PA3_SET_MASK);
}
else
{
VPORTA.OUT &= ~(PA1_SET_MASK | PA3_SET_MASK);
}
// Apply PWM brightness to LED 3-6
setPWM_PA2(brightness * 255 / 100); // Scale 0-100 to 0-255
}