Thanks. When I set the voltage to 1.8V, everything runs just fine with 40MHz flash speed, but when I try to use my OTA WiFi-based reflash mechanism, there are a lot of write errors: I (102562) upgrade: OTA Partition: 3FFB71BC I (102564) upgrade: Set start address for flash writes to 0x00100000 I (10...

Thanks WiFive - that worked. I was at 80MHz DIO, which apparently worked at 3.3V and apparently passed the data hash checks (??) but at 40MHz it flashes and runs just fine: make flash Flashing binaries to serial port /COM4 (app at offset 0x10000)... esptool.py v2.1-beta1 Connecting.... Chip is ESP32...

I tried the usual recovery steps: esptool.py --port /COM4 read_flash_status esptool.py v2.1-beta1 Connecting.... Detecting chip type... ESP32 Chip is ESP32D2WDQ5 (revision 0) Uploading stub... Running stub... Stub running... Status value: 0xff00 Hard resetting... esptool.py --port /COM4 flash_id esp...

It was not. I applied that patch and was able to get it to burn as expected - thanks. espefuse.py --port /COM4 set_flash_voltage 1.8V espefuse.py v2.1-beta1 Connecting... Set internal flash voltage regulator (VDD_SDIO) to 1.8V. The following efuses are burned: XPD_SDIO_FORCE, XPD_SDIO_REG. It is pos...

Thanks. For the runtime approach, this is what happened when I put the following lines at the very start of app_main() - it boots normally with the lines removed: #include "soc/rtc_cntl_reg.h" REG_SET_FIELD(RTC_CNTL_SDIO_CONF_REG, RTC_CNTL_XPD_SDIO_REG, 1); REG_SET_FIELD(RTC_CNTL_SDIO_CONF_REG, RTC_...

Ok, so I've implemented this at startup - and the device will not boot. I've also tried running this later after the device is booted. This results in execution slowing down significantly and the wifi connection disconnecting. Thoughts?

I need to write the EFUSE settings for VDD_SDIO in the field via firmware update. Long story, but we released boards for production before documentation came out mentioning the need for 1.8V setting for flash on ESP32-D2WD. I'm aware of these headers but some information is missing on how to apply t...

We are having the same problem! We are in testing now. Help!

Looks like someone made a library to use this:
https://github.com/Jeija/esp32free80211

But an API change was made recently that broke it...?

I see similar behavior on Windows 10 using my MacBook Pro built-in WiFi (bootcamp mode). No issues with external USB adapter I picked up from Adafruit.