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atmel-samd: Fix the neopixel delay method so it handles overflow better. #394

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Merged
dhalbert merged 1 commit into from
Nov 1, 2017
Merged

atmel-samd: Fix the neopixel delay method so it handles overflow better. #394

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6 changes: 5 additions & 1 deletion ports/atmel-samd/common-hal/neopixel_write/__init__.c
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,12 @@ static inline void delay_cycles(uint8_t cycles) {
uint32_t stop = start - cycles;
if (start < cycles) {
stop = 0xffffff + start - cycles;
while (SysTick->VAL < start || SysTick->VAL > stop) {}
} else {
// Make sure the systick value is between start and stop in case it
// wraps around before we read its value less than stop.
while (SysTick->VAL > stop && SysTick->VAL <= start) {}
}
while (SysTick->VAL > stop) {}
}
#endif

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