291–300 of 356 posts
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It saves cost and none of the features of USB-C (speed, power delivery etc) are supported. Makes sense.
the price difference from usb to usb-c is less than 2 cents
also "proper" usb-c support is another can of worms, and maybe sticking to an older standard gives you freedom from all that.
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Thanks for a great product! A (small?) ask. Can we have instruction timings please? Like how many cycles SMLAL (signed multiply long, with accumulate) takes? Will there be an official development board with all 48 GPIOs exposed?
Cortex-M33 timings aren't documented, but one of our security consultants has made a lot of progress reverse engineering them to support his work on trace stacking for differential power analysis of our AES implementation. I've asked him to write this up to go in a future rev of the datasheet. No official 48 GPIO board, I think: this is slightly intentional because it creates market space for our partners to do somet…
Thanks!
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I have given some thought to a two-wheeled electric tractor for dealing with mud -- horse paddocks turn into basically a 1-foot deep slurry after heavy rain and it can be easier to deal with something small that sinks through the mud, down to solid ground than something using large floatation tires. Additional problem with large tires is that they tend to throw mud around, making everyone nearby even more dirty. I ha…
Your description fit what I've seen for rice farming, whose machines usually use bike-like tires.
Would they be more effective with thin wheels? Both humans and cattle seem to sink in a few inches and stop; I don’t know what’s under the layer of mud and what makes up a rice paddy.
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Do you have any protection against power/clock glitching attacks?
Yes, several approaches. More here: https://x.com/ghidraninja/status/1821570157933912462
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You run into issues if you try to implement something like RMII, which requires an incoming 50MHz clock. There's an implementation out there which feeds the clock to a GPIO clock input - but because it can't feed the PLL from it and the PIO is driven from the system clock that means your entire chip runs at 50MHz. This has some nasty implications, such as being unable to transmit at 100meg and having to do a lot of p…
Just to clarify, and it sounds like the answer is yes, this is a problem even with an external 50MHz clock signal?
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Right? Bidirectional capability at those speeds would be incredible for the price of this chip. Either way, still looking forward to see what people cook up with it, and hopefully I'll find a use for it as well. Maybe combine it with some cheap 1920x1080 portable monitors to have some beautiful dashboards around the house or something...
1920x1080 30 Hz DVI would require running RP2350 at least at 311 MHz ((1920 * 1080 * 30Hz * 10) / 2). Probably a bit more to account for minimal horizontal and vertical blanking etc. Multiplier 10 comes from 8b10b encoding. To fit in 520 kB of RAM, the framebuffer would need to be just 1 bpp, 2 colors (1920 * 1080 * 1bpp = 259200 bytes). From PSRAM I guess you could achieve 4 bpp, 16 colors. 24-bit RGB full color wou…
> 1 × USB 1.1 controller and PHY, with host and device support Sure, after integrating USB 2.0 HS or 1Gb-Ethernet the pico2-board will cost more than $5. So, integrated high-speed interfacing with PC was not a nice-to-have option (for special chip flavor)?
>USB 2.0 HS 480 Mbps SERDES > or 1Gb-Ethernet 1.25 Gbps SERDES
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> English, so weird Borrowed from just-as-weird French "piquer" - to stab or jab.
As other more than 30% of English words [1]: [1] Is English just badly pronounced French [video]: https://news.ycombinator.com/item?id=40495393
says the guy with engineering samples and creme of the creme silicon parts... i expect most that will actually be available when they do to their normal schedule of scraping the literal bottom of the barrel to keep their always empty stocks that will not be the case.
> 1 × USB 1.1 controller and PHY, with host and device support Sure, after integrating USB 2.0 HS or 1Gb-Ethernet the pico2-board will cost more than $5. So, integrated high-speed interfacing with PC was not a nice-to-have option (for special chip flavor)?
I think the target here is low-power peripherals rather than speedy peripherals, and the price is very nice for that :)
[1] https://www.raspberrypi.com/news/rp1-the-silicon-controlling...