Revert "Enable WFI for raspberrypi port" #5356
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ladyada
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Sep 16, 2021
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Closing to resubmit to get an artifacts build. |
jepler
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Nov 12, 2022
This needs thorough testing before it's merged, as we tried and reverted this once before (adafruit#5341 and adafruit#5356). I think that besides checking for tinyusb having "something to do", the fact that `port_interrupt_after_ticks` and `port_disable_tick` weren't implemented that was causing a secondary problem. I've tested this on a pico w over reboot-cycles and ctrl-c-cycles, with and without drive automounting, with and without serial repl open, and on a power-only connection. I didn't notice the problem reported in adafruit#5356 after merely implementing port_idle_until_interrupt; but I did notice that sleeps in general would take over-long until "something" (like writing to the USB drive) happened; I think "something" was probably calling port_enable_tick(). When this problem was happening, sleeps would take a lot longer; for instance, `sleep(.001)` would take about 1/20s and `sleep(.1)` would take about 1/7s.
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Reverts #5341 to fix #5354 for now. We'll do a more detailed diagnosis after 7.0.0 final.
Discussed in terms of scheduling with @tannewt.