Jon's Friendica Node | Jonathan Lamothe @ Jon's Friendica Node

Jonathan Lamothe

me@social.jlamothe.net

Programmer and free/libre software enthusiast. This is my primary account on the Fediverse. See my website for an authoritative list of accounts.
https://jlamothe.net

Ontario, Canada

jlamothe@jabber.sdf.org

https://jlamothe.net ✔

Jonathan Lamothe

5 months ago

Jonathan Lamothe
5 months ago

Picked up a handful of #AVR chips (ATMEGA168) and am familiarizing myself with the datasheet, but it makes me wonder: can you really call it a "datasheet" if it's 653 pages long? 🤔

#AVR

Coffee ⏚ reshared this.

Question for the #AVR crowd of the fediverse: What kind of ISP programmer do y'all recommend (for people using #Linux ) these days? An old tutorial recommended the USBtinyISP, but it appears to be out of stock (and possibly outdated?) everywhere I look. #AskFedi

#Linux #askfedi #AVR

Andrew Pam likes this.

reshared this

Jonathan Lamothe

5 months ago

I'd build a DAPA cable, but I no longer own a machine with a serial port.

Nav

5 months ago •

👋 I'd recommend the Atmel-ICE. It's well supported on Linux and supports debugging. I've had mine for almost a decade. I've put it through quite a lot and it's still working fine. If you want work with PICs as well, then the PICkit 4 may be a better option. Someone asked a similar question on AVRFREAKS not that long ago: https://www.avrfreaks.net/s/topic/a5C3l000000UlYAEA0/t193349

AVR Freaks

^{www.avrfreaks.net}

Jonathan Lamothe likes this.

Jonathan Lamothe

5 months ago

@Nav Does it require their proprietary IDE? I'm trying to keep my toolchain as open as possible.

Many years ago, I had a job that involved programming PICs, but it could only be done with their software on Windows, and required an expensive license if you wanted to use C instead of Assembly. That's why I was looking at AVR.

I know they got bought out by Microchip and a number of things have doubtless changed since then (circa 2012-ish).

@Nav

Nav

5 months ago •

AVR development doesn't require a proprietary IDE.

For the toolchain, you can use GCC.

For programming, you can use avrdude (works well with the Atmel-ICE on Linux).

For debugging, you can use Bloom and GDB. Bloom exposes a GDB server, allowing GDB to gain access to the AVR target for debugging operations. You can also program the target via Bloom (using GDB's `load` command)(disclaimer: I'm the author of Bloom). Bloom also works well with the Atmel-ICE.

I use CLion, GCC, avrdude and Bloom for all of my AVR development.

Jonathan Lamothe likes this.

Jonathan Lamothe

5 months ago

@Nav Oh wow, it's a little pricier than I was expecting. I'll have to put it on my birthday/Christmas wishlist, I guess. In the meantime, I'm pretty sure I've got an old Arduino kicking around that can be hacked into a makeshift programmer.

@Nav

Mx. Savanni D'Gerinel

2 months ago •

I use https://www.adafruit.com/product/46 when I'm programming a bare AVR chip.

Some of the out-of-dateness may be about a protocol that I've heard rumor of that allows chips to be reprogrammed without an intermediate programmer. However, I've not explored it and even forget what the protocol was.

USBtinyISP AVR Programmer Kit (USB SpokePOV Dongle)

USBtinyISP is a simple open-source USB AVR programmer and SPI interface. It is low cost, easy to make, works great with avrdude, has both 6 and 10 pin standard ISP cables, is ...

^{www.adafruit.com}

Jonathan Lamothe likes this.

Jonathan Lamothe

2 months ago

@Mx. Savanni D'Gerinel This is surprisingly reasonably priced. Thanks!

@Mx. Savanni D'Gerinel

Mx. Savanni D'Gerinel

2 months ago •

It was also fun to assemble.

Gonçalo Ribeiro

2 weeks ago •

@savanni hey, just to mention that you may also build your own #AVR programmer probably even cheaper (but more DIY) with the
#VUSBtiny project:

https://github.com/goncalor/vusbtiny

I've had mine for ~8 years and still use it. You can see it in the background on this post.

https://infosec.exchange/@goncalor/111015206229493477

#electronics

Gonçalo Ribeiro

2023-09-05 23:46:54

This absolutely unremarkable blink is actually quite cool to me at the moment since it's being controlled by a timer/counter, two compare matches and an interrupt service routine. This is just as a test for how I'm thinking of implementing HSYNC.
The pin is configured to toggle when the counter reaches a top value, via a compare match. That would make the LED blink by itself. However there is a second compare match at half (configurable) that top value which is forcing a compare match. So the pin can generate a pulse of configurable duration and period.
And not that I have written this I realise I seem to have just implemented a convoluted PWM lol. Should check if I can just use PWM for what I need.
#electronics

GitHub - goncalor/vusbtiny: Small ISP programmer that uses an ATtiny running V-USB

Small ISP programmer that uses an ATtiny running V-USB - GitHub - goncalor/vusbtiny: Small ISP programmer that uses an ATtiny running V-USB

^GitHub

#electronics #AVR #vusbtiny @Mx. Savanni D'Gerinel

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Jonathan Lamothe 5 months ago •

Jonathan Lamothe
5 months ago •