8000 ESP32-S2 2nd USB-SERIAL or more interfaces than endpoinds with static descriptor · Issue #3849 · adafruit/circuitpython · GitHub
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ESP32-S2 2nd USB-SERIAL or more interfaces than endpoinds with static descriptor #3849

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emard opened this issue Dec 19, 2020 · 4 comments
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ESP32-S2 2nd USB-SERIAL or more interfaces than endpoinds with static descriptor #3849

emard opened this issue Dec 19, 2020 · 4 comments
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@emard
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emard commented Dec 19, 2020

My basic wish is to have second USB-SERIAL device in
ESP32-S2 which will lead to hardware TX/RX lines.

I was thinking - if descriptor must be static, and list all supported
device for which same endpoints have to be shared, then
perhaps on the OS (at least linux) is possible to blacklist unneeded
drivers, so that actually endpoints will be used only by not blacklisted
drivers, and things may work. (at least in heory)
@dhalbert
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dhalbert commented Dec 19, 2020 •
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I'm not quite sure what you're looking for. We have been thinking about a secondary CDC serial connection over USB. So for instance on Linux, you'd have /dev/tty/ACM0 for the REPL connection, and then also a /dev/ttyACM1 on the host side, which was a read/write stream on the Python side. But if you want hardware UART, then you want to use busio.UART.

@emard
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emard commented Dec 19, 2020 via email

@ladyada
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ladyada commented Dec 19, 2020

this may be a dup of
#231
?

@dhalbert dhalbert added this to the Long term milestone Dec 19, 2020
@dhalbert dhalbert mentioned this issue Dec 19, 2020
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@dhalbert
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I rewrote this as a more general issue in #3853 and will close this in favor of that issue.

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