Thanks ESP_LJH, that was the problem. I saw that early on, and discounted it as the reason for blocking programming, because IO16-17 were connected only to high impedance FET gates. I still don't quite know why having them connected to FET gates would prevent programming. Maybe gate capacitance was ...

Here's another update: I've captured the entire load sequence in a Docklight log for each of the two test units (ESP32 DevKitM-1 and my Target board). They are very similar in the beginning, but the log for the Target board shows where it stops long before the upload is complete. Again, thanks, robin

I'm not sure why my last post didn't appear on the forum, but I'll try again. I'm not able to run the esptool.py commands on my Windows 11 PC. I don't know why. I've researched online, and I think it should be working, but it isn't. Python and esptools are loaded on the machine and are working when ...

Hi ESP_Sprite, Thanks for your feedback. MTDI is floating. In the original design (and on my target board) they had a pullup resistor, that was causing VDD_SDIO to run at 1.8V. However, I've removed that resistor and now the MTDI pin is floating. Now I measure 3.3V at pin 26 VDD_SDIO. I put a 1uF ce...

Hi All, I inherited an untested target board for a new design that contains an ESP32-U4WDH. It was originally designed with a different ESP32, and not all corrections were made, but I've modified it to comply with the requirements stated on the ESP32 online "Schematic Checklist." Scheme.png I'm usin...

I'm using vs code v 1.85.1 with Espressif IDF v 1.6.5 running under Windows 11. Also, there's MS C/C++ IntelliSense v 1.18.5 along with C/C++ Extension Pack. I'm having ongoing problems with #includes. Every time I try running new code that I've received from a colleague, I run into these problems. ...