qmk_firmware/platforms
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
..
arm_atsam [Core] Update mpaland/printf to eyalroz/printf fork (#16163) 2022-07-07 09:27:50 +02:00
avr [Core] Update mpaland/printf to eyalroz/printf fork (#16163) 2022-07-07 09:27:50 +02:00
chibios [Core] Use polled waiting on ChibiOS platforms that support it (#17607) 2022-07-11 15:17:05 +02:00
test
atomic_util.h
bootloader.h
common.mk
eeprom.h
gpio.h
hardware_id.h
pin_defs.h
progmem.h
sleep_led.h
suspend.c
suspend.h
synchronization_util.h
timer.h
wait.h