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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 /keyboards/alpine65/halconf.h
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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