Toots for thejpster@hachyderm.io account

Written by Jonathan ‘theJPster’ Pallant on 2025-02-01 at 21:01

They said the RP2040 VGA Terminal couldn't do 80 column colour text.

It can with Rust.

https://youtu.be/_AQ3qu_fZQI

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Written by Jonathan ‘theJPster’ Pallant on 2025-02-01 at 10:21

https://www.smbc-comics.com/comic/seethe

I can neither confirm nor deny whether this accurately reflects my work as an open source developer.

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-31 at 21:00

I’ve spent a couple of weeks on this: Rust support libraries for Arm Cortex-R - a vector table, SVCall handler, startup code, examples, and more.

https://github.com/rust-embedded/cortex-r/pull/4

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-31 at 17:25

Bonus question. How about:

println!("{:08p}", 1 as *const u8);

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-31 at 17:18

quick quiz - without looking, what will this print in Rust?

println!("{:#08x}", 1);

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-31 at 11:36

The Internet went into meltdown last time the Rust Foundation published a Trademark Policy. The new one seems to be getting crickets ... which is great news I guess?

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-30 at 18:56

I’m enjoying https://podcasts.apple.com/gb/podcast/the-amp-hour-electronics-podcast/id386547290?i=1000686280714. There’s a lot of nerdy detail about chip design.

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-28 at 21:23

I dislike this thread greatly.

https://internals.rust-lang.org/t/rusts-responsibility-to-engage-in-good-neighborly-behavior/22193/78

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-28 at 08:03

This article featuring @bagder makes some good points about open source legacy, in the practical sense.

https://apple.news/ASRUUeJzISOuBSxcZDJDn2w

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-27 at 19:23

Today’s waste of time was brought to you by masking out the wrong bits from a register, and my CPU sneakily defaulting to running Exceptions in Thumb Mode instead of Arm Mode.

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-26 at 21:24

Well, today I lost about three hours of my life because I converted 0b0100 to 8 instead of 4.

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-26 at 10:19

Arm Cortex-R (and I guess ‘legacy’ Arm) is so weird.

Want to return from an exception handler? Just MOV the Link Register to the Program Counter Register.

Unless it’s an Prefetch Abort, IRQ or FIQ handler, in which case subtract 4 first.

Or if it’s a Data Abort exception, where you subtract 8 first.

This is what happens when people design an ISA and a pipelined CPU at the same time.

https://developer.arm.com/documentation/den0042/a/Exceptions-and-Interrupts/Exception-priorities/The-return-instruction

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-26 at 07:16

Specifically, I’m ending up in my SVC handler with a stack pointer of zero, but only on a QEMU Cortex-R52 machine. The Cortex-R5 works as expected.

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-26 at 06:59

Can anyone explain to me how SVC works in EL1 on Armv8-R? It doesn’t seem to work like Armv7-R.

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-22 at 07:59

“So it's Jonathan's fault? Well, no…Jonathan is an experienced programmer. We didn't think he would've made a mistake like this. And he hasn't…”

https://tweedegolf.nl/en/blog/145/the-hunt-for-error--22

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-20 at 20:47

Need to organise transport to Embedded World. I looked at it in detail but in just going to have to fly. I’ve got appointments to keep and I can’t trust Eurostar to get me to Cologne or DB to get me on to Nuremberg. It’s a great pity.

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-17 at 18:49

I fixed it! The DMA engine doesn’t work unless it’s had a reset cycle.

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-17 at 17:28

My code is broken and I don’t know why and it makes me sad.

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-17 at 15:06

https://www.bbc.co.uk/news/articles/cz0lldd30xlo

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Written by Jonathan ‘theJPster’ Pallant on 2025-01-17 at 14:05

iCloud for Windows is a sack of crap. The iPhotos part is permanently stuck "initialising".

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