https://docs.espressif.com/projects/esp ... structures

Also esp_now_send return value only indicates that the packet was internally queued successfully. You need to use the send callback to determine the outcome of sending it.

vTaskDelete doesn't return so obj never goes out of scope so obj's destructor never runs. This is expected. C++ has no way of "knowing" what vTaskDelete(NULL) does, it can't be cleaning up anything upon arbitrary function calls that it expects to return from. A separate function or your commented br...

However, if I programmatically set the brown-out detector threshold to 3.19v right before shutting off the boost converter (remember, the ultracap is 3.0v max), the ESP32-S2 is guaranteed to be held in brown-out reset until VDD reaches 3.30v. What is guaranteeing this? I would expect an immediate b...

https://github.com/boarchuz/bo_dfu Bitbanged USB Low Speed and DFU for the ESP32 2nd-stage bootloader. It works surprisingly well, give it a try! It's surreal plugging my ESP32 into my phone and updating it in a web browser (when WebUSB decides to work, at least). Some ideas: enable OTA updates with...

Remove 'static'

Looks like this: https://sourceware.org/binutils/docs/as ... nment.html

"As an optimization to improve performance, the assembler attempts to align branch targets so they do not cross instruction fetch boundaries."

Will overwrite. Only one is supported.

You risk bricking the device if the erase+write is interrupted for any reason, so imo it's worth avoiding this where possible. Unless these changes need to be backwards compatible, there's no need to literally alter the partition table. You can specify the partition in your esp_vfs_littlefs_conf_t, ...

There's nothing special about GPIO0 in this respect, so I would expect some bouncing from the tactile switch. There may be a capacitor which will filter out a bit of noise, but it may also cause boot issues so most designs exclude it. Even if this particular switch is very well-behaved you shouldn't...

The NVS component would be quite heavy for this imo, not to mention the significant effort of porting it to the bootloader. I would assign a single-sector (0x1000 bytes) partition for this purpose, and use basic flash operations to read and alter the setting: to get the current setting, read and cou...