nrf52: external file system

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ttmetro
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Re: nrf52: external file system

Post by ttmetro » Wed Feb 17, 2021 1:14 am

jimmo wrote:
Wed Feb 17, 2021 12:59 am
But it's crazy inefficient because you have a task that has to burn a lot of time just polling that queue.
Thanks for the note on ThreadSafeFlag; I'll use that for now.

BTW: no need to poll for interrupt driven events. The latter wake up the CPU, after handling the ISR it proceeds right from where it went to light sleep (presumably after WFI or something). If it decides nothing is ready it goes right back to sleep.
Bernhard Boser

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jimmo
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Re: nrf52: external file system

Post by jimmo » Wed Feb 17, 2021 3:08 am

ttmetro wrote:
Wed Feb 17, 2021 1:14 am
BTW: no need to poll for interrupt driven events. The latter wake up the CPU, after handling the ISR it proceeds right from where it went to light sleep (presumably after WFI or something). If it decides nothing is ready it goes right back to sleep.
Yes, but the problem is multiplexing all the different wakeup sources and deciding what is ready. This is exactly what uevent will do -- asyncio polls _only_ uevent, and different ISR handlers (pin, timer, network, socket, etc) can signal a given uevent slot.

ttmetro
Posts: 95
Joined: Mon Jul 31, 2017 12:44 am

Re: nrf52: external file system

Post by ttmetro » Wed Feb 17, 2021 10:42 pm

jimmo wrote:
Wed Feb 17, 2021 3:08 am
... different ISR handlers (pin, timer, network, socket, etc) can signal a given uevent slot.
Great! I'm looking forward to this, especially together with low power BT (nrf?) this will be fantastic.
Bernhard Boser

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