Commit graph

3 commits

Author SHA1 Message Date
Stefan Kerkmann 45ffe42f1a
[Fix] Make ChibiOS _wait.h independent of quantum.h (#17645) 2022-07-12 21:54:33 +02:00
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
Joel Challis 2728603fe6
Move tmk_core/common/<plat> (#13918) 2021-11-19 10:41:02 -08:00
Renamed from tmk_core/common/chibios/_wait.h (Browse further)