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watch_rtc clarification: 128 Hz is 0x80, not 0xF0

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This commit is contained in:
Joey Castillo 2025-05-15 22:12:12 -04:00
parent 374a93846d
commit 60914647b1
1 changed files with 1 additions and 1 deletions
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watch-library/hardware/watch/watch_rtc.c
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@ -71,7 +71,7 @@ void watch_rtc_register_periodic_callback(watch_cb_t callback, uint8_t frequency
// this left-justifies the period in a 32-bit integer.
uint32_t tmp = (frequency & 0xFF) << 24;
// now we can count the leading zeroes to get the value we need.
// 0x01 (1 Hz) will have 7 leading zeros for PER7. 0xF0 (128 Hz) will have no leading zeroes for PER0.
// 0x01 (1 Hz) will have 7 leading zeros for PER7. 0x80 (128 Hz) will have no leading zeroes for PER0.
uint8_t per_n = __builtin_clz(tmp);
// this also maps nicely to an index for our list of tick callbacks.