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support common anode LEDs

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This commit is contained in:
Joey Castillo 2021-09-18 14:26:18 -04:00
parent 5ff4a88374
commit 9baec59217
1 changed files with 5 additions and 0 deletions
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5
watch-library/watch/watch_private.c
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@ -88,6 +88,11 @@ void _watch_enable_tcc() {
// period (i.e. a square wave with a 50% duty cycle).
// * LEDs on CC[2] and CC[3] can be set to any value from 0 (off) to PER (fully on).
hri_tcc_write_WAVE_reg(TCC0, TCC_WAVE_WAVEGEN_NPWM);
#ifdef WATCH_INVERT_LED_POLARITY
// This is here for the dev board, which uses a common anode LED (instead of common cathode like the actual watch).
hri_tcc_set_WAVE_reg(TCC0, (1 << (TCC_WAVE_POL0_Pos + WATCH_RED_TCC_CHANNEL)) |
(1 << (TCC_WAVE_POL0_Pos + WATCH_GREEN_TCC_CHANNEL)));
#endif
// The buzzer will set the period depending on the tone it wants to play, but we have to set some period here to
// get the LED working. Almost any period will do, tho it should be below 20000 (i.e. 50 Hz) to avoid flickering.
hri_tcc_write_PER_reg(TCC0, 4096);