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fix undefined behavior found by clang's sanitize

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This commit is contained in:
Alex Maestas 2023-12-07 02:24:26 +00:00
parent 1b90a4a07a
commit 8206f37fcf
2 changed files with 4 additions and 4 deletions
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4
watch-library/hardware/watch/watch_rtc.c
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@ -84,7 +84,7 @@ void watch_rtc_register_periodic_callback(ext_irq_cb_t callback, uint8_t frequen
if (__builtin_popcount(frequency) != 1) return;
// this left-justifies the period in a 32-bit integer.
uint32_t tmp = frequency << 24;
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.
uint8_t per_n = __builtin_clz(tmp);
@ -99,7 +99,7 @@ void watch_rtc_register_periodic_callback(ext_irq_cb_t callback, uint8_t frequen
void watch_rtc_disable_periodic_callback(uint8_t frequency) {
if (__builtin_popcount(frequency) != 1) return;
uint8_t per_n = __builtin_clz(frequency << 24);
uint8_t per_n = __builtin_clz((frequency & 0xFF) << 24);
RTC->MODE2.INTENCLR.reg = 1 << per_n;
}

4
watch-library/simulator/watch/watch_rtc.c
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@ -92,7 +92,7 @@ void watch_rtc_register_periodic_callback(ext_irq_cb_t callback, uint8_t frequen
if (__builtin_popcount(frequency) != 1) return;
// this left-justifies the period in a 32-bit integer.
uint32_t tmp = frequency << 24;
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.
uint8_t per_n = __builtin_clz(tmp);
@ -105,7 +105,7 @@ void watch_rtc_register_periodic_callback(ext_irq_cb_t callback, uint8_t frequen
void watch_rtc_disable_periodic_callback(uint8_t frequency) {
if (__builtin_popcount(frequency) != 1) return;
uint8_t per_n = __builtin_clz(frequency << 24);
uint8_t per_n = __builtin_clz((frequency & 0xFF) << 24);
if (tick_callbacks[per_n] != -1) {
emscripten_clear_interval(tick_callbacks[per_n]);
tick_callbacks[per_n] = -1;