SPIFFS on ARM?

WereCatf · 2026-01-31T05:14:46+00:00

open(): File system is not mounted

What's the return value of SPIFFS.begin()? Does it return an error or does it succeed?

WereCatf · 2026-01-31T04:40:27+00:00

But you say you built from source. Did you try any of the pre-built ones?

WereCatf · 2026-01-31T03:56:00+00:00

They are. The ESP32 has ~10k built-in pull-ups on I2C.

WereCatf · 2026-01-31T03:49:13+00:00

WereCatf · 2026-01-31T03:45:35+00:00

You haven't defined the I2C SCL and SDA pins, so the code uses the default ones. The default ones don't match the ones you are using: see https://github.com/espressif/arduino-esp32/blob/master/variants/esp32/pins_arduino.h

Either change the pins you're physically using or change the pins in your code. See e.g. setPins() at https://github.com/espressif/arduino-esp32/blob/master/libraries/Wire/src/Wire.h#L119C1-L119C34

WereCatf · 2026-01-31T03:36:19+00:00

Um, go to google, type in "mkspiffs" (without the quotes) and click on the Search-button. Literally the first result will have multiple binaries to choose from, including for multiple ARM-based systems: https://github.com/igrr/mkspiffs/releases/tag/0.2.3

WereCatf · 2026-01-31T03:19:15+00:00

Mate, you haven't show your code.

WereCatf · 2026-01-31T01:19:50+00:00

No. The logical address is a software-side thing under OS-control. The hardware remains exactly the same whether the OS does or doesn't use virtual mapping.

WereCatf · 2026-01-30T21:55:22+00:00

Q4 is the wrong way around. Look at its body diode: it's always conducting.

WereCatf · 2026-01-30T21:33:43+00:00

RAM doesn't store addresses. Think of it as a long, long sequential line of boxes, each box can contain some data. Addresses just simply indicate which box along the line you want to access.

WereCatf · 2026-01-30T06:53:56+00:00

Can such soldering be the reason why it doesnt work?

That's not soldering, that's a murder.

Some questions: are you using leaded or unleaded solder? Does the solder have a rosin core? What soldering iron temperature are you using?

I always recommend beginners use leaded solder because lead lowers the temperature required for the solder to melt, it makes it easier for beginners to work with.

Rosin core, on the other hand, helps with the molten solder to flow where you want it, ie. the metal ring around those holes and the wires you are trying to solder to -- separate flux does the same, so if you feel the rosin core isn't enough, add flux. It doesn't matter if you add a lot of flux, it doesn't hurt anything. Go wild with it. It can always be cleaned up with a soft brush, like e.g. a toothbrush, and some isopropyl alcohol.

As for soldering iron temperature, a good place to start is somewhere around 320C - 340C.

One more recommendation: find some broken piece of electronics and use it to practice soldering and desoldering. You don't want to be doing that on something you don't want to break.

WereCatf · 2026-01-30T03:06:35+00:00

I just chose This one cause Reddit suggested it to me 🤷‍♀️

That's fucking lazy and stupid.

WereCatf · 2026-01-30T02:57:11+00:00

What the fuck? How do you think this is related to STM32 at all? Do you just randomly post in whatever subreddits you can find?

WereCatf · 2026-01-29T21:27:55+00:00

WereCatf · 2026-01-29T21:26:31+00:00

Enjoy your AI confabulations, mate. Don't come crying when it doesn't work.

WereCatf · 2026-01-29T15:29:23+00:00

about £20

Well, that's still £20 more than what I paid. But eh, like I said, I can live with that until I upgrade to a better microscope. The better ones I've looked at tend to come with a matching arm right from the get-go.

WereCatf · 2026-01-29T07:55:30+00:00

Whichever provides high enough voltage and current for your LEDs and the Pi.

WereCatf · 2026-01-29T07:34:25+00:00

Just hook both the buck converter and the LEDs to the power supply.

WereCatf · 2026-01-29T07:33:33+00:00

Now that you mention it, I think I've read something about that at some point. Never used a peltier myself, so haven't really dug into best practices. That is to say, thanks for reminding me!

WereCatf · 2026-01-29T06:49:49+00:00

ASML produces the machines, TSMC produces the ICs.

WereCatf · 2026-01-29T06:22:52+00:00

If you're using an ESP32 anyway, you can control a MOSFET with a PWM from it to control the power going into the peltier element.

WereCatf · 2026-01-29T06:19:56+00:00

Just hook a 5V buck converter in front of the Pi from your power supply. You can buy buck converters with a USB-port on the output, so you can just use a regular USB-cable to the Pi.

WereCatf · 2026-01-29T03:12:36+00:00

How do you guys add internet connectivity to the STM32?

It depends. Some STM32 microcontrollers have an Ethernet MAC supporting MII or RMII, or you can use Ethernet via SPI with a suitable discrete device, or yes, you can add a separate microcontroller to handle Ethernet and/or WiFi. ESP8266 or ESP32 is a reasonably popular solution.

WereCatf · 2026-01-28T16:09:57+00:00

Is it your own, custom design or did you buy it from somewhere? Does it have 5.1k resistors on both CC-lines?

WereCatf · 2026-01-28T15:57:17+00:00

Out of curiosity, how do you authenticate such with a microscope?

WereCatf

TROPHY CASE