Recent posts

#1

FPGA / Re: SPI Programming Sequence f...

Last post by LubOlimex - Today at 08:14:26 AM

Yes, this is expected way to reliably be able to program via SPI. This is mentioned in our guides, for example when using OLIMEXINO-32U4 to re-program the board via Arduino IDE:

https://github.com/OLIMEX/iCE40HX1K-EVB/tree/master/programmer/olimexino-32u4%20firmware

Notice this part in the README.md:

"BUT+RST to start USB to Serial Hold BUT down until last restart, i.e. for a rather long time. Think of BUT as a shift-button to RST, but that must be held down a long time after RST has been released.

This is useful when developing FPGA-projects that use serial communication with the computer that you used to program it with. You don't have to buy an extra USB to serial converter or use an extra USB cable or port."

#2

A20 / Re: update to Debian 12 (Bookw...

Last post by gregh - April 06, 2026, 05:23:24 PM

It seems that there are Olimex bookworm images now:

https://images.olimex.com/release/a20/

It also seems that they contain only the old kernel versions from Bullseye:

https://repository.olimex.com/dists/bookworm/main/binary-armhf/Packages

How secure are those old kernels?

#3

FPGA / SPI Programming Sequence for i...

Last post by cdan - April 03, 2026, 01:04:38 PM

I am using an external programmer (pico-serprog) to program the iCE40HX8K via SPI. Programming only works if C_RESET is pulled LOW before powering on the board. If C_RESET is pulled LOW after power is already applied, SPI communication fails.

Can you confirm: When C_RESET is pulled LOW while the board is already powered on, do the SDI, SDO, and SCK pins on the FPGA chip enter high-impedance (Hi-Z) state? Is there a specific reset/power-on sequence required for the iCE40 to enter SPI programming mode?

#4

ESP32 / Re: Demo Code for ESP32-P4-Dev...

Last post by lph65724 - March 30, 2026, 04:57:56 AM

Thank you

#5

ESP32 / Re: Demo Code for ESP32-P4-Dev...

Last post by LubOlimex - March 23, 2026, 11:18:41 AM

This demo works 100%: https://github.com/OLIMEX/ESP32-P4-DevKit/tree/main/SOFTWARE/Demo_Examples/display_lvgl_demos

#6

ESP32 / Demo Code for ESP32-P4-DevKit ...

Last post by lph65724 - March 20, 2026, 10:52:28 AM

I just purchased a ESP32-P4_DevKit and a MIPI-HDMI, and I want to try to output some thing to a TV. Is there a demo code for me to try that?

Thank you

#7

A20 / Re: HDMI connection back feedi...

Last post by LubOlimex - March 19, 2026, 08:12:29 AM

Thank you for the update! Glad you fixed it, hopefully if another customer has similar issue will stumble on your post!

#8

A20 / Re: HDMI connection back feedi...

Last post by dry - March 19, 2026, 01:54:33 AM

I got this little adapter:
https://www.aliexpress.com/item/1005004985145407.html?spm=a2g0o.order_list.order_list_main.17.21ef1802VXeBN3#nav-specification

( ISHRIC VGA HDMI-compatible Virtual Display Adapter Dummy Plug Emulator Lock plate 4K Headless Ghost Display Emulator DDC Edid ).

..and no clue on details how its wired, but, all my tests so far it stops that leakage / backfeed.  no more leds on, no more voltage coming in from monitor. bah.

I did not want to un-solder stuff on my Oli board, in case i damage it, so this works better for me

#9

A20 / Re: HDMI connection back feedi...

Last post by dry - March 18, 2026, 03:20:49 AM

disable CEC mode

So i bought Lindy CEC less HDMI adapter, with no connection on pin 13.  The issue still persists,
still leaks...

Nothing to do seem with serial, no serial to usb connected.

So. HDMI feedsback in, but Not due to CEC ...

#10

ESP32 / Re: New ESP32-POE-ISO - was I ...

Last post by chrismacp - March 09, 2026, 05:49:51 PM

Okay, I managed to measure Pins 1 and 3, a little tricky indeed. I only got 0.2mV so I think that it's probably dead.

I'll try and replace it and see how it goes. I appreciate the help trying to fix this btw