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Added note on USB CDC bootloader

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Kevin Townsend 2018-04-23 19:58:29 +02:00 committed by GitHub
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33
ports/nrf/boards/feather52840/README.md
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@ -74,7 +74,7 @@ nrfjprog version: 9.7.2
JLinkARM.dll version: 6.20f
```
### Flash the Bootloader with `nrfjprog`
### Option 1 (nRF52832 or nRF52840): Flash the HW UART Bootloader with `nrfjprog`
> This operation only needs to be done once, and only on boards that don't
already have the serial bootloader installed.
@ -105,6 +105,37 @@ Run.
From this point onward, you can now use a simple serial port for firmware
updates.
### Option 2 (nRF52840): Flash the USB CDC Bootloader with 'nrfjprog'
> This operation only needs to be done once, and only on boards that don't
already have the serial bootloader installed.
Once `nrfjprog` is installed and available in `PATH` you can flash your
board with the serial bootloader via the following command:
```
make SD=s140 BOARD=feather52840 boot-usb-flash
```
This should give you the following (or very similar) output, and you will see
a DFU blinky pattern on one of the board LEDs:
```
$ make SD=s140 BOARD=feather52840 boot-usb-flash
Use make V=1, make V=2 or set BUILD_VERBOSE similarly in your environment to increase build verbosity.
nrfjprog --program boards/feather52840/bootloader/usb/feather52840_bootloader_6.0.0_s140_single.hex -f nrf52 --chiperase --reset
Parsing hex file.
Erasing user available code and UICR flash areas.
Applying system reset.
Checking that the area to write is not protected.
Programing device.
Applying system reset.
Run.
```
From this point onward, you can now use a simple serial port for firmware
updates.
### IMPORTANT: Disable Mass Storage on PCA10056 J-Link
The J-Link firmware on the PCA10056 implement USB Mass Storage, but this