RP2350pc Open Source Hardware all in one computer

https://olimex.wordpress.com/2025/07/01/rp2350pc-open-source-hardware-all-in-one-computer-with-rp2350b-8mb-psram-16mb-flash-four-usb-host-dvi-hdmi-output-and-audio-codec-for-retro-computer-emulation-and-education/

54•AlexeyBrin•6h ago

Comments

nfriedly•3h ago

That reminds me a bit of the Adafruit Fruit Jam, which is another little SBC built around the RP2350 - https://www.adafruit.com/product/6200

oytis•3h ago

Olimex board seems to be available right now though.

kevin42•3h ago

I think this is a really cool project, but the problem with putting so many peripherals on such a small processor is that it's really tough to have firmware that uses all of those things at once and fit in the memory footprint.

I can see this as a great platform for prototyping though.

crest•2h ago

The memory footprint is 520kiB of SRAM + 8MiB of QSPI RAM + 16MiB of QSPI flash. What kind of bloated monstrosity do you want to run on that poor board?

Lerc•2h ago

Once you have video out, Memory eating options become quite available. Framebuffers are quite large.

I've got a 1.4inch screen waveshare rp2350 sitting beside me at the moment. I'm currently fighting getting paletted display update via DMA with limited success. As I work through it it does become apparent to me that you could generate a tiled+sprites mode a scanline at a time on demand with PIO and DMA. I'm not convinced it could be run with zero CPU involvement, but it could certainly be done with very little CPU.

raphlinus•56m ago

For 640x480 output not overclocked, I estimate tile + sprite CPU utilization to be about 50% of one core. Of course you have two cores. That number goes up and down depending on resolution, particularly when you're pixel doubling.

It's absolutely doable. There's the beginning of a tile demo (a scrolling brick wall) in the pico-dvi-rs repo.

Retr0id•3h ago

Huh, according to the schematic the USB hub upstream port is routed to the D+/- pins on the rp2350. How does that work? I thought the only way a rp2350 could act as a USB host was via PIO?

rasz•3h ago

rp2350 has 'USB 1.1 controller and PHY, with host and device support'. Plugging powered cable to USB-C should keep HUB in reset.

15155•1h ago

> I thought the only way a rp2350 could act as a USB host was via PIO?

With the vendor SDK driver, yes. The controller can operate in Host mode if you BYO driver.

rasz•3h ago

>Stereo Audio Codec with Stereo Audio Amplifier

uses ES8311 'Low Power Mono Audio CODEC' http://www.everest-semi.com/pdf/ES8311%20PB.pdf, Mono DAC with differential output. I dont even understand why someone would do that, yes its a $.3 part but real stereo codec from TI (TLV320AIC320x) is just $.6

Edit: looking at BOM it might be caused by Made in China 2025 and trying to get as close to 100% domestic part list for some subsidies.

chaosprint•3h ago

very cool. But I don't understand why ES8311 mono audio codec is used here. I recently successfully run Glicol (https://github.com/chaosprint/glicol) on Pico 2 and I am building a prototype board for myself. AIC3204 is my first choice for now and it's not that expensive

raphlinus•2h ago

This looks really cool, I ordered one. I'm also waiting for the Fruit Jam, mentioned elsethread.

The pico-dvi-rs project has an early prototype of race-the-beam video generation, which I think has a lot of potential, it's going to allow much richer content than a framebuffer on this kind of device. One fun thing we've got going is proportionally spaced bitmap fonts, which is fairly unusual in this form factor. Please get in touch with me if you're interested in driving this thing with Rust.

[1]: https://github.com/DusterTheFirst/pico-dvi-rs

Lerc•2h ago

That's a lot of stuff connected to the one RP2350.

I can't help but feel that you could make almost the same board with 2 or 4 RP2350's without a significant percentage increase in cost.

Couldn't you wire most of the GPIOs together, they start off at high impedance, then let them work out who does what with plenty of options for weird processor sharing arrangements.

I guess if it's open source, I could take a look at doing one myself. What's the worst that could happen :-)

15155•1h ago

> Couldn't you wire most of the GPIOs together, they start off at high impedance, then let them work out who does what with plenty of options for weird processor sharing arrangements.

This is a ton of software to build.

Fast Linux-capable SOCs are only $5 with 100x+ the specs.

Lerc•1h ago

You don't play with these things for the raw performance. I'd get a quad rp2350 just so I could have a go at writing the software for such a weird architecture.

There are heaps of boring off the shelf options.

joezydeco•1h ago

I'm playing with the 2040/2350 because it's dirt cheap. A Pico2W with BT/Wifi is $7 from Adafruit.

I'm working on a project where we might just hand these to customers for a certain function and consider them disposable when the work is done.

Scaleway Is Down for Hours

Poll: Are you going to DEF CON 33?

Large CO2 removal potential of woody debris preservation in managed forests

Show HN: MCP-Teleprompter – Stop repeating yourself to LLMs

That boolean should probably be something else

Palestinian journalist recounts horror of post-October 7 imprisonment

A Sad Day for Physical Bitcoin Collectors

1.58bit LLM Optimised Tensor Core

Bezos-backed methane tracking satellite is lost in space

New model 'cypher-alpha' on Openrouter

Show HN: TrustyPost – An All-in-One Creator Toolkit (Design, AI, Scheduling)

Love-hate relationship you grow with your product

Don't buy a drive blind – learn which type fits your needs

China successfully tests hypersonic aircraft, maybe at Mach 12

Understanding Artifact Processing in ReARM

How much (little) are the AI companies making?

Soft Ware for Hard Power (2024)

Researchers Turn Plastic into Paracetamol

MCP for Skeptics

Ask HN: How are you evaluating your LLMs in production?

Sam Altman Slams Meta's AI Talent Poaching: 'Missionaries Will Beat Mercenaries'

Ask HN: Does the world economy run on sales people?

Wayback Machine: One Trillion Web Pages Archived

Amazon launches a new AI foundation model to power its robotic fleet

The Hoyle State (2021)

ICEBlock – See Something, Tap Something

After 48 years, Zilog is killing the classic standalone Z80 microprocessor chip

Dirac Large Numbers Hypothesis

Nothing Phone (3) and Headphone (1) are here

From Tyson to TikTok: the boxing fan generational gap is widening