Unexpected Error: #<Errno::EINVAL: Invalid argument - tcsetattr> about rust-raspberrypi-os-tutorials HOT 8 CLOSED

Ah, I didn’t know macOS was more restrictive.
That’s a pity.

Does Miniterm start if you set it to 256000? (You wouldn’t see sane output though, because the Kerne binary is hardcoded to 576000.

from rust-raspberrypi-os-tutorials.

I read up a bit on it. Seems macOS usually doesn’t allow more than 230400 when opening the device, but it seems there is a way to circumvent it using stty.

Can you do a test for me?

1. change the baudrate in miniterm.rb back to 230400.
2. Start the Miniterm.
3. In a different console, execute stty -f /dev/USB_SERIAL_NAME 576000
4. Only now power the RPi and check if you can see the console output.

For reference: https://stackoverflow.com/a/32083512

from rust-raspberrypi-os-tutorials.

@andre-richter

Does Miniterm start if you set it to 256000? (You wouldn’t see sane output though, because the Kerne binary is hardcoded to 576000.

Yes. It works fine when I revert ee52e8e288ef6f00416eed94921c2b0e1acfab73

❯ DEV_SERIAL=/dev/tty.usbserial-1420 make miniterm
Miniterm 1.0

[MT] ✅ Serial connected
[0] Booting on: Raspberry Pi 4
[1] Drivers loaded:
      1. BCM GPIO
      2. BCM PL011 UART
[2] Chars written: 93
[3] Echoing input now
kjkdsafdsa

[MT] Bye 👋

I'll try the test using stty.

from rust-raspberrypi-os-tutorials.

@andre-richter It seems 576000 is invalid value on macOS.

stty -f /dev/tty.usbserial-1420 576000
stty: tcsetattr: Invalid argument

The value 460800 which is mentioned in the stackoverflow was valid.

$ stty -f /dev/tty.usbserial-1420 460800

$ echo $?
0

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Thanks!

Then I might need to make the whole tutorials use 460800 to solve this issue and adapt miniterm.rb to spawn the stty when on macOS.

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@andre-richter I've created PR to fix this problem.
I've checked it works on my macOS.

Please review & merge it If it looks good. #96

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Hi @sachaos,

could you please try out #97 on your Mac and tell me if it works?
I bumped to 921_600 baud + some more fixes.

I added you as co-author of this new PR to credit your findings.

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@andre-richter Thank you! I'll try the PR.

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