How to flash code to RAKWireless with RUI Platform Firmware with GCC

If you follow instruction at https://github.com/RAKWireless/RUI_Platform_Firmware_GCC.
And work, that will be fine. For me, that not work well. I feel like i live in space. Yeah!

This because i have no knowlage about nrf52, nordic, rak, microcontroller, c language ... well, i am game developer not expert microcontroller. (I suck at this)

Anyway, let's start.

Install arm-none-eabi
DO NOT USE LASTEST VERSION -> i use version 7.2.1 (GNU Tools for Arm Embedded Processors 7-2017-q4-major)
You can use lower version
- download from here https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads/7-2017-q4-major-1-1
[Check here for more information https://gist.github.com/joegoggins/7763637]

In winodw if you use cygwin that RAKWireless recommended, you NEED to install "make" too. Because "make" not include.

- download and install J-Link Software https://www.segger.com/downloads/jlink/

In mac check nrfjprog is installed.

For me, nrfjprog is installed by nRF5x-Command-Line-Tools.
And add it to ~/.bash_profile

add line this in your "~/.bash_profile"

================================
export PATH="$HOME/[You path]/nRF5x-Command-Line-Tools/nrfjprog:$PATH"
export PATH="$HOME/[You path]/nRF5x-Command-Line-Tools/mergehex:$PATH"
================================
for gcc

=================================
export PATH="$HOME/[You path]/gcc-arm-none-eabi/bin:$PATH"
=================================

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This should end step 2 in RAKWireless readme
--------------------------------------------

- download https://github.com/RAKWireless/nRF5SDK15.0.0 and extract it.
- download https://github.com/RAKWireless/RUI_Platform_Firmware_GCC and extract it.
- Put "RUI" folder that inside RUI_Platform_Firmware_GCC to "nRF5_SDK_15.0.0_a53641a" folder

folder structure will be like this

nRF5_SDK_15.0.0_a53641a
 - RUI
 - components
 - config
 - ...
 
For mac
Edit this file "nRF5_SDK_15.0.0_a53641a/components/toolchain/gcc/Makefile.posix

For Window
Edit this file "nRF5_SDK_15.0.0_a53641a/components/toolchain/gcc/Makefile.windows

============================
GNU_INSTALL_ROOT := $(PROGFILES)/GNU Tools ARM Embedded/4.9 2015q3/bin/ -> change to your file path
GNU_VERSION := 4.9.3 -> change to your version
GNU_PREFIX := arm-none-eabi
============================


example 
$ which arm-none-eabi-gcc
/Users/admin/CMMC/gcc-arm-none-eabi/bin/arm-none-eabi-gcc

$ arm-none-eabi-gcc --version
arm-none-eabi-gcc (GNU Tools for Arm Embedded Processors 7-2017-q4-major) 7.2.1 20170904 (release) [ARM/embedded-7-branch revision 255204]
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

============================
GNU_INSTALL_ROOT := /Users/admin/CMMC/gcc-arm-none-eabi/bin/arm-none-eabi-gcc/
GNU_VERSION := 7.2.1
GNU_PREFIX := arm-none-eabi 
============================
---> WARNING in GNU_INSTALL_ROOT, Do not forget to add "/" in the end.


Open terminal and goto your folder /nRF5SDK15.0.0/nRF5_SDK_15.0.0_a53641a/RUI/build

$ make help

If everythings work it will show help.
----------------------------------------

Try make

For me i use RAK8212M

*** To enable log go to "/nRF5SDK15.0.0/nRF5_SDK_15.0.0_a53641a/RUI/Source/sdk_config.h" and find and change "NRF_LOG_ENABLED 0" to "NRF_LOG_ENABLED 1".

$ make P="1 2 4"

you will get "_build" folder

----------------------------------------

To flash code
I use nrfjprog.

$ nrfjprog -f nrf52 --eraseall
$ nrfjprog --program hex/s132_nrf52_6.0.0_softdevice.hex
$ nrfjprog --program _build/nrf52_xxaa.hex  --sectorerase
$ nrfjprog -r

In window you have nrfgo studio.

-----------------------------------------

To view data open other 2 terminal 

First terminal type 
$ JLinkExe -device NRF52 -if SWD -speed 4000 -autoconnect 1
Then, Secoud terminal type
$ JLinkRTTClient

You should get log from secound terminal.

If nothing show up, try unplug and redo this section.

-------------------------------------------
END.

(After this i not know want i can do, i live in speace again)