localhorst/lezyne-rear-light-firmware
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get hw pwm running

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Hendrik Schutter
2025-11-08 23:27:42 +01:00
parent 0e5b6587a7
commit 256a77b3fa
1 changed files with 4 additions and 9 deletions
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13
main.c
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@ -63,7 +63,7 @@ void ledStaticFull(void);
int main(void) int main(void)
{ {
// Configure LED pins as outputs // Configure LED pins as outputs
VPORTA.DIR = (PA2_SET_MASK | PA3_SET_MASK | PA6_SET_MASK | PA7_SET_MASK); VPORTA.DIR = (PA1_SET_MASK | PA2_SET_MASK | PA3_SET_MASK | PA6_SET_MASK | PA7_SET_MASK);
initPWM(); initPWM();
// Configure PA0 as input with pull-up // Configure PA0 as input with pull-up
@ -152,15 +152,10 @@ static inline void switchMode(void)
void initPWM(void) void initPWM(void)
{ {
// Configure PA2 as output // No PORTMUX needed - PA2 is WO2 by default
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 in normal mode (single slope PWM)
TCA0.SINGLE.CTRLB = TCA_SINGLE_CMP0EN_bm | TCA_SINGLE_WGMODE_SINGLESLOPE_gc; TCA0.SINGLE.CTRLB = TCA_SINGLE_CMP2EN_bm | TCA_SINGLE_WGMODE_SINGLESLOPE_gc;
// Set period for ~19.5kHz PWM (5MHz / 256 = ~19.5kHz) // Set period for ~19.5kHz PWM (5MHz / 256 = ~19.5kHz)
TCA0.SINGLE.PER = 0xFF; TCA0.SINGLE.PER = 0xFF;
@ -171,7 +166,7 @@ void initPWM(void)
void setPWM_PA2(uint8_t duty) void setPWM_PA2(uint8_t duty)
{ {
TCA0.SINGLE.CMP0 = duty; TCA0.SINGLE.CMP2 = duty;
} }
/** /**