Jonathan ‘theJPster’ Pallant / is on Nostr

Father. Husband. Engineer. Rustacean. Humanist. Former Town Mayor. He/him.

Github: GitHub.com/thejpster
Bird site: @therealjpster
Reddit: thejpster
Web: https://thejpster.org.uk

Last Notes

2024-08-27 21:48:39

What is the coolest electronic gizmo that can be made using entirety JLCPCB Basic Parts?

2024-08-08 17:45:15

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I bought one.

2024-08-08 17:36:40

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Ah! I want one. To go on https://www.elecrow.com/neotron-pico-rev-1-1-assembled.html. So I can emulate a PC and run Windows.

2024-08-08 17:33:11

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on a Pico 2? They don't have PSRAM on them.

2024-08-08 17:15:57

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I haven't been brave enough to dead bug a PSRAM onto my one and only prototype. How hard was it?

2024-08-08 17:00:37

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More RP2350 features:
* Arm Trustzone, so apps can be isolated from your secure bootloader (and e.g. can't read your signing keys)
* A new ROM which supports UART boot, flash partitions, code signing, copying to SRAM for execution, selecting Arm or RISC-V mode, and more.
* The M33 can only do single-precision float, so there's a custom co-pro to accelerate double-precision float maths.
* A custom co-pro for single-cycle GPIO set/clear/xor/toggle.
* More power-management options.
4/5

2024-08-08 17:00:31

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More RP2350 features:
* Nominal clock increased to 150 MHz
* Hardware SHA256 engine
* 3x PIO blocks with four SMs each, plus extra instructions
* Hardware DVI-D support - a TMDS encoding bit-serialiser that can output 4x 252 Mbaud on a 126 MHz PLL.
* 8 KiB of on-chip One Time Programmable Flash, which you can boot from
* The XIP block can do address translation - your A/B application updates can be linked for the same execution address, but live in different flash partitions
3/5

2024-08-08 17:00:22

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The main RP2350 changes:
* Two Arm Cortex-M33F, instead of Cortex-M0+
* Two RISC-V "Hazard3" cores (which share the bus with the Arm cores, so you can't have all four)
* 520 KiB of SRAM, up from 264 KiB
* It comes in QFN60 (A) or QFN80 (B) packages. Sorry, it's not pin compatible - I'm told it needed extra ground pins
* Zero (RP2350x) or 2 MiB (RP2354x) of on-chip flash
* It supports QSPI PSRAM as well as QSPI Flash, and there's two Chip Select lines
* It starts at $0.80
2/5

2024-08-08 17:00:16

Hello! Today Raspberry Pi released their follow-up to the RP2040: The RP235x. I've been working on Rust support for these new chips and I have:
* A lengthy blog post at https://thejpster.org.uk/blog/blog-2024-08-08/
* A Github fork of https://github.com/rp-rs/rp-hal which is now open source at https://github.com/thejpster/rp-hal-rp2350-public/
* This toot thread!
A bunch of you guessed "Cortex-M3" based on the leaked part number. Surprise! It standards for Arm Cortex-M33 AND RISC-V Hazard3.
1/5