Bangle1 connecting SWD - VDD voltage

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user156811

So i wasn't even able to program it without the battery using my raspberry pi pico board. Don't know why? pico should be able to produce up to 300mA?

But it doesn't really matter anyway because when reattached the battery and try and program it i get "Device has AP lock engaged". So i'll have to use a real segger programmer anyway and completely erase the chip.

Will i be able to recharge the battery if i attach VDD?

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fanoush in reply to @user156811
Device has AP lock engaged". So i'll have to use a real segger programmer anyway

No need for segger for that, Pico with CMSIS-DAP and OpenOCD could do it too, newer OpenOCD versions even print helpful message how to do that.
```
nRF52 device has AP lock engaged (see UICR APPROTECT register).
Debug access is denied.
Use 'nrf52_recover' to erase and unlock the device.
```
So just use 'nrf52_recover' command.

And BTW you could also unlock it from the device via software by erasing and rewriting UICR from javascript.
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fanoush in reply to @user156811

Will i be able to recharge the battery if i attach VDD?

you mean 3.3V? no, the battery is 3.7-4.2V but you can attach 5V like it was meant to be used when the device is closed. You could even do it with Pico - take 5V feeding the Pico and connect it to 5V charger input pins on the watch. Just ignore the 3.3V

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