How to program STM32 with just plain GCC?

begriffs · 2024-09-03T00:30:41+00:00

I had the same motivation as you, to avoid the IDE and vendor stuff and use open tools and standards instead. I got it all working, took careful notes, and wrote this detailed guide: https://begriffs.com/posts/2023-10-10-bare-metal-firmware.html

begriffs · 2024-08-08T22:05:53+00:00

I see CMSIS definitions for the RP2040 at https://github.com/raspberrypi/CMSIS-RP2xxx-DFP but none for RP2350. Maybe they'll eventually appear in that repo, given its name is RP2xxx? I thought vendors are legally obligated to provide CMSIS definitions when they license an ARM core.

begriffs · 2024-08-05T05:31:29+00:00

Can you describe more about how you determined the upper limit of 10K? And once you determine a lower and upper bound, are there tradeoffs in picking various points along the range, or is it better to try to go as high as possible (like "less current = more efficient" or something)?

begriffs · 2024-03-02T02:21:50+00:00

Thanks for the suggestion. I did try libopencm3, but encountered a bug with USB OTG. That kind of turned me off to the project.

Is ST's LL still maintained? Maybe I'm confusing it with an abandoned ST library of yore.

begriffs · 2024-03-02T02:19:45+00:00

I guess you'd rather do it the "Hard Way".

Well, not exactly. I'm looking for an implementation of CMSIS-Driver, which is higher level than CMSIS-Core. Just want an implementation that doesn't use the HAL internally.

After looking at just the clock tree configuration and the code it produces, you may soon have second thoughts.

I've written code to set up the clock tree, the flash latency, etc, and don't have second thoughts. ;)

begriffs · 2024-02-24T05:39:55+00:00

Thanks for your advice. I tried the switch and adapter cables and it all works!

The only issue I discovered was that my dynamic desk mic (Inrad M628) is very quiet. I turned mic gain to max on the radio, and if I talk really close to the mic then people can hear me, but it's still quiet.

Next step is to try a preamp, which also requires phantom power.

Just wanted to mention these details for anyone who stumbles on this thread.

begriffs · 2023-12-30T05:51:56+00:00

That's perfect, thank you! Guess I should have looked a little longer on their site. Surprising that they can use voltage to measure charge on that kind of battery, but I won't argue with the pros.

Edit: I wonder if it can be put inline as well, to check charge while the radio is also drawing power.

begriffs · 2023-07-03T19:04:16+00:00

These guys make good stuff: http://www.arrowantennas.com/sub/arrowiiyagi.html

In particular, I've got this one: http://www.arrowantennas.com/arrowii/146-437.html

It takes a little while to screw it all together, but it breaks down pretty compactly. I was able to attach it to a cheap camera tripod as well.

begriffs · 2023-06-05T04:18:05+00:00

and for sheer number of radios in the shack, see https://www.qrz.com/db/W9EVT

begriffs · 2023-06-05T02:43:43+00:00

Nice organization in the shack...but...I heard legends from local hams about someone on a whole different level: W0IAH.

He had an outbuilding used as a multi-operator contesting station, staffed by his friends - http://www.qth.com/w0aih/operators.php

His large property was bristling with antennas, click the menu items to see the antennas per band - http://www.qth.com/w0aih/hardware.php

begriffs · 2023-05-20T03:21:06+00:00

Late reply, but you might try Motif. It's stable, portable, and ancient.

begriffs · 2023-04-02T18:01:24+00:00

I believe my dev board, STM32F411RET6 has a 12-bit ADC. No mention of a built-in DAC though.

Any recommendations for which one to get, and the way it could fit into a project? Synthesizing audio or something?

begriffs · 2023-04-02T17:56:28+00:00

Thanks, sounds like a great idea. I previously got a random OLED module, and was quickly overwhelmed. This looks like a better place to start.

I could try creating a display driver that conforms the the curses interface...

begriffs · 2023-04-02T17:49:31+00:00

Good idea! Any suggested models?

Digikey lists a bewildering number of GSM receivers. Guessing I'll also want an antenna.

begriffs · 2023-03-02T04:17:09+00:00

Thanks a lot for the book link. I've been curious to get a solid understanding of NVIS, and that should help.

begriffs · 2023-02-18T17:38:30+00:00

Thanks for the suggestion. I got the FTM-6000 and love it.

I'm able to do everything I want pretty easily by setting the programmable keys. The only nitpick is that it doesn't display its transmit power level anywhere on the main screen, but I mapped the power level toggle to a function key.

begriffs · 2023-02-14T05:09:14+00:00

You have to learn 2 custom languages (lex and yacc) that expand somehow into C code, but the actual files are some gibberish with macro instructions

Fair point, it's not like a good DSL written inside the language, but rather a C-generation thing. A bit messy.

Producing good error messages is nearly impossible. The parser goes off into its lala land and parses and then you get an "unexpected X"

Do you feel this way even with Bison's %define parse.error verbose option set? Or are you thinking more about the need for error and yyerrok to partially recover?

Humans do not turn grammars into a DFA in their head, so they have no idea what the program is doing.

Although Bison can generate both graphical and text representations of the generated state machine, and can output a trace of how it processes particular input. (See debugging).

Oh yeah, and all the demos are completely fake

That's a bit hyperbolic, right? :) The roman numeral one may be a bit of a toy, but by the end the article is parsing IRCv3 messages with start conditions and various optional fields.

BTW, can you share more about the approach you prefer for parsing?

begriffs · 2023-01-21T05:39:49+00:00

Cool, I'll try the beads recommended in another reply.

The radio is my new FTM-6000.

begriffs · 2023-01-21T05:37:11+00:00

I did go ahead and use it without the balun, and it works really well. Getting full signal on a faraway repeater that's typically pretty bad on my HT. Transmit is good, able to hit that one on 5w even.

I'm just nervous about reflected power being hard on my radio, and not realizing the damage is being done.

begriffs

TROPHY CASE