Open USB stack port (& examples)

Seb H

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Feb 2, 2018, 7:27:24 PM2/2/18

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If anyone's interested in making wierd & wonderful USB applications, I've ported the libopencm3 USB stack.

My libopencm3 fork for efm32hg (tomu) is here: https://github.com/schnommus/libopencm3 (branch: efm32hg)

I've also copied & updated a bunch of example applications, which you can get here: https://github.com/schnommus/libopencm3-examples (branch: efm32hg)

You'll find the examples at: examples/efm32/efm32hg/tomu-efm32hg309 in the above repository

These are the ones I've already tested on the Tomu using a Linux host:
    - A USB-Serial CDCACM device example (usb_cdcacm)
    - A USB HID mouse emulation example (usb_hid)
    - A USB Mass Storage Device example (usb_msc)
    - A USB MIDI example (usb_midi)
    - A raw endpoint example with a sample python program that controls an LED

I plan to try and push these changes upstream (to libopencm3) in the near future, but posting here in case anyone is interested (not sure how long it will take to get this upstream).

Haven't started on the touch sensing library yet; but the USB, gpio & clock libraries seem to work fine.

If you find a bug, let me know!

Cheers,
Seb.

Tim 'mithro' Ansell

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Feb 4, 2018, 4:51:52 PM2/4/18

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Awesome work Seb!

How should we make these examples available on the im-tomu github org (https://github.com/im-tomu)?

There is the https://github.com/im-tomu/tomu-samples repository, but maybe we should just for the libopencm3-examples into the organisation? We should definitely put a README or similar file in the tomu-samples repository pointing to them...

Thanks!

Tim 'mithro' Ansell

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Seb H

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Feb 5, 2018, 5:01:10 AM2/5/18

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Hi Tim,

Sure, forking libopencm3-examples (and perhaps renaming the 'efm32hg' branch to 'master') onto the organisation sounds like an easy solution for now.

As for the 'libopencm3' fork, feel free to fork that onto the org as well - we can redirect the submodule in 'libopencm3-examples' to mainline libopencm3 if/when efm32hg goes upstream.

Longer term, it probably makes more sense to add the libopencm3 submodule to 'tomu-samples', and then just put the relevant examples in the top-level directory - I'm happy to do that quick restructure when I get a chance.

Cheers,
Seb.

On Monday, 5 February 2018 08:51:52 UTC+11, Tim 'mithro' Ansell wrote:

Awesome work Seb!

How should we make these examples available on the im-tomu github org (https://github.com/im-tomu)?

There is the https://github.com/im-tomu/tomu-samples repository, but maybe we should just for the libopencm3-examples into the organisation? We should definitely put a README or similar file in the tomu-samples repository pointing to them...

Thanks!

Tim 'mithro' Ansell

On 2 February 2018 at 16:27, Seb H <schn...@gmail.com> wrote:

If anyone's interested in making wierd & wonderful USB applications, I've ported the libopencm3 USB stack.

My libopencm3 fork for efm32hg (tomu) is here: https://github.com/schnommus/libopencm3 (branch: efm32hg)

I've also copied & updated a bunch of example applications, which you can get here: https://github.com/schnommus/libopencm3-examples (branch: efm32hg)

You'll find the examples at: examples/efm32/efm32hg/tomu-efm32hg309 in the above repository

These are the ones I've already tested on the Tomu using a Linux host:
    - A USB-Serial CDCACM device example (usb_cdcacm)
    - A USB HID mouse emulation example (usb_hid)
    - A USB Mass Storage Device example (usb_msc)
    - A USB MIDI example (usb_midi)
    - A raw endpoint example with a sample python program that controls an LED

I plan to try and push these changes upstream (to libopencm3) in the near future, but posting here in case anyone is interested (not sure how long it will take to get this upstream).

Haven't started on the touch sensing library yet; but the USB, gpio & clock libraries seem to work fine.

If you find a bug, let me know!

Cheers,
Seb.

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Tim 'mithro' Ansell

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Feb 5, 2018, 11:24:02 AM2/5/18

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Hi Seb!

We have forked the libopencm3 and libopencm3-examples repository into the I'm Tomu organisation (https://github.com/im-tomu). I also added the following to the samples directory -> https://github.com/im-tomu/tomu-samples/tree/master/libopencm3

Tim 'mithro' Ansell

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Seb H

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Feb 5, 2018, 3:57:29 PM2/5/18

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Sweet, thanks Tim!

youlian troyanov

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Feb 6, 2018, 5:00:04 AM2/6/18

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hey seb
how do you test gpios on tomu? what i have been doing myself and what i have seen others doing in that regard on "enthusiast" boards does not seem applicable here. what am i missing here?

Seb H

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Feb 6, 2018, 4:25:10 PM2/6/18

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Hi Youlian,
As far as GPIOs go, I've only tested libopencm3's GPIO driver on the 2 LEDs on the board (GPIOs PA0, PB7). I don't see why it wouldn't work on other pins though --

Seb H

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Mar 3, 2018, 12:46:55 AM3/3/18

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Update for future reference - the efm32hg libopencm3 changes are now upstream at https://github.com/libopencm3/libopencm3
And all the examples have been moved to: https://github.com/im-tomu/tomu-samples/
If anyone's been playing with this, I would strongly recommend switching to upstream libopencm3 as I made some bugfixes to the USB stack.

- Seb.

Chinmay Pendharkar

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Apr 9, 2019, 11:59:01 AM4/9/19

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Thanks Tim and Seb. The usb-cdcacm example is super handy for what I'm trying to do.

Quick question about that though. Where is the baud rate set? I got the demo working with the baud rate of my terminal app set to 115200, but I can't find where in the code that is set up.

Thanks!

Sean Cross

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Apr 9, 2019, 12:01:07 PM4/9/19

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The baud rate really doesn't matter.

If it were connecting to a real device, or acting as a real serial port, the baud rate would set an actual real UART. But since it's just a USB device answering your queries, it'll talk as fast as you like.

Within limits of the buffer, of course!

Sean

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Chinmay Pendharkar

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Apr 9, 2019, 10:04:13 PM4/9/19

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Interesting. I didn't realize that the baud rate on usb-cdcacm was not really relevant.

Just for the record, I tried with 460800 and it's worked fine.

`stty -f /dev/cu.usbmodemDEMO1 460800 & screen /dev/cu.usbmodemDEMO1 460800`

-Chinmay

P.S. Thanks for porting dfu to Tomu @xobs.

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