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embedded-graphics / hardware-bench

A standard test bench for a variety of embedded-graphics targets
MIT License
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Raspberry PI Pico hardware bench #2

Closed rfuest closed 1 year ago

rfuest commented 1 year ago

Here is a first version of a Raspberry PI Pico based breakout board for the display modules. It is pretty bare bones and does only contain a rotary encoder in addition to the display modules. But I've added an additional connector for a SSD1306 based 0.91" display, which did fit in the gap between the other OLEDs and it should be possible to configure the addresses to not conflict which each other.

The PCB is 120mm x 130mm.

PCB without modules: hardware-bench

And with modules: hardware-bench-with-display

rfuest commented 1 year ago

@jamwaffles I don't seem to have the necessary permissions to request a review in this repo, but I would appreciate some feedback.

rfuest commented 1 year ago

I added the e-g core team as admins, so hopefully now you should be able to request reviews and other things :)

Thanks.

1. Could we add the display controller ICs to the silkscreen labels? It makes it a bit more obvious which module should go where. That said, some modules are interchangeable (e.g. SH1106 and SSD1306) so maybe we should leave them agnostic.

I had considered to add the controllers to the silkscreen, but ultimately decided against it because of the interchangeability you mentioned. Do you think it would be enough to mention the default configuration somewhere else, like the docs for a BSP crate for the PCB?

2. How is the rPi debug port accessed?

The SWD connector is located under the lower left display, above the Rust logo. You should be able to read the labels if you view the first image in the original size.

rfuest commented 1 year ago

Or we could add a table of the default display modules on the back side of the PCB: grafik

jamwaffles commented 1 year ago

Do you think it would be enough to mention the default configuration somewhere else, like the docs for a BSP crate for the PCB?

Works for me. If we also want it on the PCB, perhaps the wording should be something like "Suggested display modules" or similar.

The SWD connector is located under the lower left display, above the Rust logo. You should be able to read the labels if you view the first image in the original size.

Thanks for pointing it out. I was looking around the pico, expecting the port to be in the top right region of the board :)

rfuest commented 1 year ago

I've added a bit more information to the table and changed the title: grafik

Thanks for pointing it out. I was looking around the pico, expecting the port to be in the top right region of the board :)

Moving the SWD connector to the left edge of the PCB did make the layout easier, otherwise I might have put it in the top right region.

jamwaffles commented 1 year ago

Looks good to me

rfuest commented 1 year ago

Looks good to me

Did that comment refer to the whole PCB or the changes to the silkscreen? I would like to order the PCBs soon, but I would also prefer if someone else has at least checked that I didn't make any obvious stupid mistakes in the schematic or PCB.

jamwaffles commented 1 year ago

Ah, just the silkscreen. I'll take a look at the PCB when I have a moment - hopefully tomorrow evening or Monday.

rfuest commented 1 year ago

I've updated the PCB a bit to use normal 2.54mm pitch jumpers instead of solder jumpers to make it easier to test I2C modules with different pinouts. It's now also possible to select between 3V3 and 5V supply voltage for the OLED modules. I had some issues with one module when it was supplied with 3V3.