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arduino: add Kconfig for delayMicroseconds() compensation #437

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arduino: add Kconfig for delayMicroseconds() compensation #437

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9 changes: 9 additions & 0 deletions Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,15 @@ config ARDUINO_MAX_TONES
If set to -1 (or any other negative value), the maximum number will be
determined from the system's digital pin configuration.

config ARDUINO_DELAY_US_COMPENSATION
int "delayMicroseconds() compensation value (us)"
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default 1
range 0 2147483647
help
Compensation value, in microseconds, subtracted from the requested
delay in delayMicroseconds() to account for software overhead.
This can improve short-delay accuracy.

endif

if USB_DEVICE_STACK_NEXT
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8 changes: 7 additions & 1 deletion cores/arduino/inlines.h
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Expand Up @@ -18,10 +18,16 @@ inline __attribute__((always_inline)) void delay(unsigned long ms) {
}

inline __attribute__((always_inline)) void delayMicroseconds(unsigned int us) {
#if CONFIG_ARDUINO_DELAY_US_COMPENSATION < 2
if (us == 0) {
return;
}
k_busy_wait(us - 1);
#else
if (us < CONFIG_ARDUINO_DELAY_US_COMPENSATION) {
return;
}
#endif
k_busy_wait(us - CONFIG_ARDUINO_DELAY_US_COMPENSATION);
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}

#endif /* __INLINES_H__ */
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