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authorStefan Kerkmann <karlk90@pm.me>2022-07-11 15:17:05 +0200
committerGitHub <noreply@github.com>2022-07-11 15:17:05 +0200
commit3f5dc472965e6a5b8efe60e33c7b6c2d18d92008 (patch)
treec60357db5312ccbaae608c47edd77982ad1c17ad /.github
parent57021d63582718635f87ba661f40683e98ba59da (diff)
[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
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