Solo: STM32L432KC How to use?

[Wesseldr]

Could someone please fill in the blanks please:

Attempt 1: Follow the manual at: https://docs.solokeys.io/solo/building/#programming
Attach a vanilla STM32L432KC board to the usb port.

1. cd targets/stm32L432
   2.make build-hacker
2. solo program aux enter-bootloader
   Fails at: solo.exceptions.NoSoloFoundError: no Solo found

Attempt 2:

1. cd targets/stm32l432
2. make build-hacker
3. Now open the STM32 Cube Programmer.
4. STM-LINK (right side programmer) and click connect.
5. Button Erasing & Programming,
6. Select the file: ./solo/targets/stm32l432/all.hex
7. Programm it in. (All goes well no errors.) & Run after programming
8. Led starts to blink
9. Disconnect power and plug in again.
10. run solo key version
    Fails at: No Solo found.

Attempt 3:

1. cd targets/stm32l432
2. make build-hacker
3. Now open the STM32 Cube Programmer.
4. STM-LINK (right side programmer) and click connect.
5. Button Erasing & Programming,
6. Select the file: ./solo/targets/stm32l432/solo.elf
7. Programm it in. (Warning Core locked...) & Run after programming
8. No blinking leds any more.
9. Disconnect power and plug in again.
10. run solo key version
    Fails at: No Solo found.

Expected result: The STM32L432 behaves like a solo-key-hacker on the usb plug that is on the board.

Please help, what am I missing here? Do I need an additional USB cable connected to the STM32L432KC and what pinson the board do I have to connect to the cable ?
Or do I need to set different settings in the programmer so it starts to act like a Solo key after flashing.

And can this info please get incorporated into the Documentation. I think setting up contributors by guiding them through the steps from 0 to hero with the STM32L432KC board is very helpful. I like to dive into the code not getting hold back by the lack of my knowledge about the development hardware used. Getting a simple step by step how to get it flashed and setup that it behaves like a Solo hacker would be very helpful.

Many thanks in advance for filling in the blanks.

JWR

[Wesseldr]

One piece is solved. You have to connect an USB cable as follow:

• USB-D- pin to PA11(D10)
• USB-D+ pin to PA12 (D2)
• Remove the jumper between D2 & GND after flashing
• Connect the ground and the +5v wires too.

On this USB cable to solo key will appear:

• solo key info works!
• solo key version (does not work, don't know what wires are the button...)

Questions remain:

• What pins do we need to shortcut to do the "button pressed" signal ?
• Can we use the flash tool also as debug output window?

[0x0ece]

FYI, a while ago we received this PR https://github.com/solokeys/solo/pull/65

I don't have a board to validate, but when working we can likely merge into our docs.

[Wesseldr]

Yes! I can confirm that this works on the STM32L432KC as described in PR #65

I was able to build the Solo key and do a successful authentication with it on a test website on FIDO2 including the button press by shorting wire A0 with gnd for a button press.

Think merging it would be helpful. Thank you for the link!
I'll update it with OsX details when it's merged.

Issue can be closed :-)

[0x0ece]

Awesome - @nickray given it's confirmed we should prob merge, thoughts?

[nickray]

We're just waiting on @szszszsz to remove the explicit copyright injection.

[Wesseldr]

oh I see, hope he does.

For now I'm not able to get the debugger stream flowing in OsX since it lacks udev. It is connecting but nothing comes through yet. Will have a look into that

[Wesseldr]

@nickray Copyright has been removed by szszszsz 👍
There is some merge 'code quality' problem which is odd since we're only dealing with a readme. Rest I think its ready to merge :-)

[Wesseldr]

HowTo has been merged:

• https://github.com/solokeys/solo/blob/master/docs/solo/nucleo32-board.md

closing this issue.