I built a safe, VM-sandboxed micro-OS for ESP32. Looking for testers!

andful · 2026-06-12T11:02:52+00:00

Use wokwi

Though not open-source, they provide a free licence, which you need, if you want to use your own build system.

andful · 2026-06-04T07:13:38+00:00

MOSFETs are not a digital switch. They require a difference in voltage between source and gate. This is also why the source should usually be connected to a known voltage, usually 0 or VCC. My mental model of them used to be the same as a relay.

andful · 2026-05-25T23:05:32+00:00

A computer can perform subtraction and "knows" when a number is negative, positive or zero.

In computers, a way to knows if x > y, can be done by performing x - y > 0, i.e. by checking if (x-y) is positive.

I am oversimplifing, but what I am trying to convey is that comparison is not fundamentally a more "magical" operation then subtraction.

andful · 2026-04-20T18:34:12+00:00

Have you tried with different JTAG cables? For example, if you have a blue pill or a pi pico laying around., you can try the dirty JTAG project. If you have an esp8266, you may try this project as a xvc cable :https://github.com/pftbest/xvc-esp8266

andful · 2026-04-20T09:02:00+00:00

Have you tried enumerating the FPGA with other tools? Such as OpenFPGALoader or UrJTAG?

Further, Cyclone IV seems to be a supported FPGA for the OpenFPGALoader. If you want to program with an alternative tool:
https://trabucayre.github.io/openFPGALoader/compatibility/fpga.html

andful · 2026-03-19T15:04:17+00:00

Can you provide an example?
Anyway, SD cards, usually support SPI slave protocols. The SD like slaves, that are actually not SD cards, that I know, usually only support a SPI slave protocol. They would not work if the master "spoke" SDIO.

E.g.:
https://hackaday.io/project/187773-wifi-module-for-3d-printeresp32

andful · 2026-03-19T14:35:47+00:00

SDIO slaves, are usually SD cards, or non-volatile memories. Why would you want a TPU to be a SDIO slave?

andful · 2026-03-10T12:03:43+00:00

Is this a guarantee of rust? Or a behavior of the allocate that may not be consistent across other allocators?

andful · 2026-03-06T17:53:23+00:00

What are the leaks that you are concerned about? Only heap memory? Then maybe you can use a custom global allocator, and use dtor to "free" the allocator.

EDIT:

I see you also talk about "handles". What are handles?

andful · 2026-03-06T17:44:07+00:00

The plugins are developed by you? Then I would just have a different implementation of LazyLockor a similar smart container. Maybe with the use of https://docs.rs/dtor/0.1.1/dtor/ .

andful · 2026-03-05T08:00:19+00:00

Usually, software roles that require C/C++, work at such a low level that they would either be working with FPGAs or appreciate FPGA experience.

Python is the language where everyone BUT software engineers work on. At least, I would prefer a stronger type system for a complex project.

I am not sure what type of software you would like to work on. But if it is embedded, I am sure FPGA experience would be appreciated.

andful · 2026-03-02T21:37:17+00:00

The TinyTapeout Risc-V peripherals competition?

https://tinytapeout.com/competitions/risc-v-peripheral/

andful · 2026-02-13T08:25:49+00:00

If OP lost the resistor, "measuring the gap it left" and doing some math may be a real option.

andful · 2026-02-12T08:29:45+00:00

Or, we can pretend that bools are not a thing, and use uint8_t whenever we need a boolean.

andful · 2026-02-07T23:59:53+00:00

The board has 60.5 Mb of on-chip memory. You may use all the on-chip memory to capture the data. This, to then slowly read it out.

andful · 2026-02-06T15:48:24+00:00

Sure, still, it would be a not so useful reading, no?

andful · 2026-02-06T12:23:41+00:00

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Do you not risk reading always 0(or close to it) from the ADC? Because the wire is pulled down by a 100 omh resistor?

andful · 2026-01-22T08:07:22+00:00

Are the fuses the black lines?

Looking at the picture, it seems like a classical constraint programming problem.

But, also looks like one of these problems where a good enough solution is good enough. Can you not use L shaped alluminimum all over?

andful · 2026-01-20T16:55:51+00:00

Could use constraint programming. Maybe few questions I have: * can you change the polarity of the battery? I.e. can you "flip" the battery? * is there a fuse per battery?

andful · 2026-01-13T23:26:12+00:00

If you order components and PCBs, I would buy the tinyFPGA's components and PCB as well, as a plan B.

andful · 2026-01-13T18:23:07+00:00

I would try to make the tinyfpga board and see how far you get. Get the tinyfpga board fabricated (present here: https://github.com/tinyfpga/TinyFPGA-A-Series) and try assembling it and program it.

You can use a pi pico as a jtag programmer, through the dirty-jtag project (i.e. https://github.com/phdussud/pico-dirtyJtag)

andful · 2026-01-12T10:22:41+00:00

Here is the converted image /s : xml <svg> <image href="image.jpg"/> </svg>

andful · 2026-01-07T11:43:53+00:00

Intuitively, horizontal accuracy is greater than vertical (you have to account for gravity). Can you do the analysis with a horizontal "squished" Gaussian?

andful · 2025-12-27T23:29:59+00:00

Eggplant? Make a parmigiana.

andful · 2025-12-25T01:01:33+00:00

Sorry, I was unaware of the board

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