qmk-firmware/keyboards/preonic/rev3_drop
Stefan Kerkmann 3f5dc47296
[Core] Use polled waiting on ChibiOS platforms that support it (#17607)
* Use polled waiting on platforms that support it

Due to context switching overhead waiting a very short amount of time on
a sleeping thread is often not accurate and in fact not usable for timing
critical usage i.e. in a driver. Thus we use polled waiting for ranges
in the us range on platforms that support it instead. The fallback is
the thread sleeping mechanism.

This includes:

* ARM platforms with CYCCNT register (ARMv7, ARMv8) this is
  incremented at CPU clock frequency
* GD32VF103 RISC-V port with CSR_MCYCLE register this is incremented at
  CPU clock frequency
* RP2040 ARMv6 port which uses the integrated timer peripheral which is
  incremented with a fixed 1MHz frequency

* Use wait_us() instead of chSysPolledDelayX

...as it is powered by busy waiting now.

* Add chibios waiting methods test bench
2022-07-11 15:17:05 +02:00
..
chconf.h
config.h Remove NO_ACTION_MACRO and NO_ACTION_FUNCTION from keyboard config.h (#16655) 2022-03-15 13:56:58 +00:00
halconf.h
info.json
matrix.c [Core] Use polled waiting on ChibiOS platforms that support it (#17607) 2022-07-11 15:17:05 +02:00
mcuconf.h
rev3_drop.c Add Encoder Map Swap Hands config for boards that support both features (#17294) 2022-06-03 12:12:15 +01:00
rev3_drop.h
rules.mk Tidy up NKRO_ENABLE rules (#15382) 2021-12-09 16:05:44 +11:00