rc-switch

Not really rc-switch but more like a test I made of the CGO wrapper on a cross-compiled C arm lib.

quick start

wget https://git.io/fjnXH && \
unzip send_sniffer_0.0.1.zip

./send 0 9999
./sniffer 2

TODO

• more doc
• more experiment
• real auto tests

requirements

• raspberry pi with GPIO,
• antenna receiver plugged on GPIO 2
• antenna transmitter plugged on GPIO 0
• Go 1.12
• wiring pi lib https://github.com/WiringPi/WiringPi
• raspberry pi toolchain https://github.com/raspberrypi/tools
• Wiring-pi lib installed on the target raspberry pi http://wiringpi.com/download-and-install/

setup cross compile

get the toolchain

git clone https://github.com/raspberrypi/tools

add toolchain compilers to path

PATH=$PATH:~/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/

build wiring pi lib (command has to be ran on the target)

apt install git && \
cd /tmp && \
git clone https://github.com/WiringPi/WiringPi && \
cd WiringPi && \
./build

repatriate the compiled .so(s) to the compiler

scp <user@pi>:/usr/local/lib/libwiringPi* ~/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/arm-linux-gnueabihf/lib/

cross the hell compile to arm

make

send binary to target

scp build/send build/sniffer <user@pi>:/tmp

run (target)

./sniffer 2
./send 0 9999

tests

easy way to find out if compilation is well made and lib is loaded in the wrapper:

env GOOS=linux GOARCH=arm CC=arm-linux-gnueabihf-gcc CC_FOR_TARGET=arm-linux-gnueabihf-gcc CGO_ENABLED=1 go build -i -v -o build/test tests/testCompilation.go

./build/test 
2019/04/22 15:06:16 calling setup
2019/04/22 15:06:16 calling handler
compilation succeed, lib loaded

sources

• http://rfelektronik.se/manuals/Datasheets/HX2262.pdf
• https://github.com/sui77/rc-switch
• http://wiringpi.com/reference
• https://golang.org/cmd/cgo/