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hw/bsp: pca10059 add readme.md
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This adds readme.md files that explains how to use
board without hardware debugger when factory programmed
Open DFU Bootloader is present.

Signed-off-by: Jerzy Kasenberg <jerzy.kasenberg@codecoup.pl>
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# PCA10059: NRF52840 USB dongle

## Flashing application without debugger

Board comes from factory with Nordic DFU Bootloader that does not recognize images created by **newt** tool.

Board with Nordic bootloader can be programmed using Nordic's [**nrfutil**](https://www.nordicsemi.com/Products/Development-tools/nRF-Util).

Here are steps to flash mynewt application:

1. Flash map of the application must be changed to match what Nordic bootloader expects.
Here is example target file with flash map suitable for Nordic bootloader.
target file: *targets/nordic_pca10059-blehci_nrf52dfu*
```yml
target.app: "@apache-mynewt-nimble/apps/blehci"
target.bsp: "@apache-mynewt-core/hw/bsp/nordic_pca10059"
target.build_profile: debug

bsp.flash_map:
areas:
# NRF52 MBR area.
FLASH_AREA_MBR:
user_id: 20
device: 0
offset: 0x00000000
size: 4kB
# NRF52 bootloader ara.
FLASH_AREA_NRF52_BOOTLOADER:
user_id: 21
device: 0
offset: 0x000E0000
size: 128kB
# mynewt image
FLASH_AREA_IMAGE_0:
device: 0
offset: 0x00001000
size: 396kB

# User areas.
FLASH_AREA_REBOOT_LOG:
user_id: 0
device: 0
offset: 0x000C8000
size: 16kB
FLASH_AREA_NFFS:
user_id: 1
device: 0
offset: 0x000CC000
size: 16kB
```
**FLASH_AREA_MBR** and **FLASH_AREA_NRF52_BOOTLOADER** are here to denote flash area not available to mynewt.
**FLASH_AREA_IMAGE_0** must start from **<span style="color:blue">0x1000</span>**
2. Build application with newt tool:
```shell
newt build nordic_pca10059-blehci_nrf52dfu
```
3. Create hex file needed by nrfutil:
```shell
cd bin/targets/nordic_pca10059-blehci_nrf52dfu/app/@apache-mynewt-nimble/apps/blehci/
arm-none-eabi-objcopy -O ihex blehci.elf blehci.hex
```
4. Create package zip file for nrfutil:
```shell
nrfutil pkg generate --hw-version 52 --sd-req 0 --application blehci.hex --application-version 1 blehci_nrf52dfu_package.zip
```
5. Enter bootloader mode by clicking reset button while user button is held. When Nordic Open DFU Bootloader is activated board red LED starts to blink and serial port is visible in the host system (**COM***x* for Windows or **/dev/ttyACM***x* for Linux).
6. Flash application package with nrfutil:
```shell
nrfutil dfu usb-serial -p /dev/ttyACM0 --package blehci_nrf52dfu_package.zip
```

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