Serialization problem using OpenWRT on mips board as application part.

[Alan Klimala]

Hello.

I want to use nRF52810 as a connectvity platform connected to OpenWRT MIPS based board via UART. For some reason the only solution I can assure is to use 2 wire UART without parity control using 9600 baudrate. I am not able to make it work.
What I've done:
- successfully created connectivity binary for PCA10040e board (nRF52810 emulated on nRF52832) that is using s112 SoftDevice (the one that will fit my target uC)
- successfully connected such a connectivity board to another PCA10040 board running heart rate example - it works fine using 2 wire 9600 UART
- successfully compiled pc-ble-example for my OpenWRT board
Unfortunately:
- I am not able to run pc-ble-driver based heart rate example by connecting my MIPS board to PCA10040 running connectivity binary with s112
- I am not able to run pc-ble-driver based heart rate example by connecting my MIPS board to PCA10040 running connectivity binary with s132
In both cases pc-ble-driver based heart rate example informs about a problem with detecting SoftDevice (no expected response). Are there some limitations regarding pc-ble-driver and serialization PHY? Maybe pc-ble-driver expects higher baudrate or even flow control? Are someone aware of problems using pc-ble-driver without connectivity binaries in a standard versions provided along with the pc-ble-driver? 

[kasiviswanathan]

Hi Alan Klimala

I am also trying to do exactly the same but ran into an issue while compiling pc-ble-driver for x86_64 itself.

Can you pls share the steps which you used to cross compile pc-ble-driver for mips based board which could be run on openwrt ?


Thanks in advance,

Kasiviswanathan.V

[Alan Klimala]

Will docker config file be enough? If so then here you go:

FROM ubuntu:latest

MAINTAINER Alan Klimala <[email protected]>

# Get neccessary dependencies
#############################
RUN apt-get update -qq &&\
    apt-get install -y \
		bash \
		bc \
		binutils \
        build-essential \
		bzip2 \
        curl \
		cpio \
        file \
        gawk \
		gcc \
		g++ \
        gettext \
        git \
		gzip \
        libncurses5-dev \
        libssl-dev \
		make \
		mercurial \
		nano \
		ninja-build \
		patch \
		perl \
        python2.7 \
        python3 \
        rsync \
		sed \
        subversion \
        sudo \
        swig \
		tar \
        unzip \
        wget \
        zlib1g-dev \
        && apt-get -y autoremove \
        && apt-get clean \
        && rm -rf /var/lib/apt/lists/*

# Compile OpenWRT build environment
###################################
WORKDIR /
RUN git clone https://github.com/openwrt/openwrt.git
WORKDIR /openwrt
RUN ./scripts/feeds update -a \
	&& ./scripts/feeds install -a
COPY ./menuconfig.config /openwrt/.config
ENV FORCE_UNSAFE_CONFIGURE=1
RUN make

# Compile vcpkg tool from Nordic Semiconductor
##############################################
WORKDIR /home
RUN git clone https://github.com/NordicPlayground/vcpkg.git 
WORKDIR /home/vcpkg 
RUN ./bootstrap-vcpkg.sh \
	&& ./vcpkg integrate install \
	&& ./vcpkg install sdl2 curl asio catch2 \
	&& ./vcpkg install --head spdlog
ENV VCPKG_ROOT=/home/vcpkg
ENV PATH=$VCPKG_ROOT:$PATH
RUN echo "set(CMAKE_C_COMPILER mipsel-openwrt-linux-musl-gcc)" >> ./triplets/x64-linux.cmake
RUN echo "set(CMAKE_CXX_COMPILER mipsel-openwrt-linux-musl-g++)" >> ./triplets/x64-linux.cmake
	
# Register OpenWRT SDK
#############################
ENV STAGING_DIR=/openwrt/staging_dir
ENV TOOLCHAIN_DIR=$STAGING_DIR/toolchain-mipsel_24kc_gcc-8.4.0_musl
ENV LDCFLAGS=$TOOLCHAIN_DIR/usr/lib
ENV LD_LIBRARY_PATH=$TOOLCHAIN_DIR/usr/lib
ENV PATH=$TOOLCHAIN_DIR/bin:$PATH
#ENV CC=mipsel-openwrt-linux-gcc
#ENV CXX=mipsel-openwrt-linux-g++

# Prepare libnrf package
##################################
#WORKDIR /home
#RUN mkdir -p packages/libnrf
#COPY ./pc-ble-driver/Makefile /home/packages/libnrf/Makefile
#WORKDIR /openwrt
#RUN cp ./feeds.conf.default ./feeds.conf \
#	&& echo "src-link vemmio /home/packages" >> feeds.conf
#RUN ./scripts/feeds update -a \
#	&& ./scripts/feeds install -a

# Uncomment below if you want 
# to have libNRF built.
##################################
#WORKDIR /home/packages/libnrf
#RUN rm Makefile && \
#	git clone https://your-link-to-pc-ble-driver .
#COPY ./pc-ble-driver/Makefile /home/packages/libnrf/Makefile
#WORKDIR /openwrt
#COPY ./libnrf_menuconfig.config /openwrt/.config
#RUN make

WORKDIR /home
CMD ["bash"]