document how to enter bootloader on various boards

[dhalbert]

e.g., on PCA10056, must hold down button1 while pressing reset. Describe what other buttons do as well.

Thanks - you told me this in discord, but I'm not sure it's written down anywhere else.

[hathach]

it is listed here in the feature issue, on pca10056, button1 is DFU, button2 is FRST. https://github.com/adafruit/Adafruit_nRF52_Bootloader/issues/6

[dhalbert]

Could you put that info in the README?

[hathach]

sum up

• DFU = gnd + reset : CDC + UF2
• DFU = gnd + FRST = GND + reset : OTA
• FRST + reset = clear application
• adafruit-nrfutil --touch 1200 option --> CDC only

[ladyada]

i will add more details here as well https://learn.adafruit.com/admin/guides/2074/editor/13384

[hathach]

@dhalbert @ladyada yeah, I will do it to the readme.md as well. Better to get things in one place :D

[hathach]

just add how to use section, though I am not a good writer at all ( not even close ). Please feel free to edit them.

[dhalbert]

I'm happy to copyedit the English. Getting documentation added is much more important than that it be perfectly grammatical, etc.

[ladyada]

me too, i can do the writing, i just need the correct commands to run :)

[hathach]

Great, I will just throw out commands and descriptive text from now on kaka :D

[ladyada]

ok please add/edit here as necessary, https://learn.adafruit.com/circuitpython-on-the-nrf52

[christophepersoz]

Is there an access to FRST and DFU on pins for the nRF52840 express dongle? Can't find any documentation on this even on the schematic. Thanks