Work in progress, should be configurable, and perhaps turned into a library and another application would do the actual work of storing the data in for example Influx DB. Currently CRC check doesn't pass in the cc1101 crate, should be fixed too. I'm fairly new with Rust, so all help, nags, recommendations appreciated.
$ cargo run
Compiling sparsnas v0.1.0 (file:///home/pi/sparsnas)
Finished dev [unoptimized + debuginfo] target(s) in 6.83 secs
Running `target/debug/sparsnas`
11 3e 39 40de 0009693e ed39 3207 000205e3 64 # Current power: 287
11 3e 3a 40de 0009693e ed3a 30d2 000205e5 64 # Current power: 294
11 3e 3b 40de 0009693e ed3b 3009 000205e6 64 # Current power: 299
11 3e 3c 40de 0009693e ed3c 2fd6 000205e7 64 # Current power: 301
A Ti CC1101 (available for about 3-4 USD) connected to a Raspberry Pi:
Vdd - 3.3V (P1-17)
SI - MOSI (P1-19)
SO - MISO (P1-21)
CS - SS (P1-24)
SCLK - SCK (P1-23)
GDO2 - GPIO (P1-22)
GND - GND (P1-25)
Update to the latest kernel via sudo rpi-update, and add the following SPI
settings to /boot/config.txt:
dtparam=spi=on
dtoverlay=spi0-hw-cs
The overlay is needed to get SPI_NO_CS working. Without this it's not possible to
perform multiple SPI transfers within the same chip-select.
Compiling this on the Raspberry Pi is fairly painful. To get cross compilation going add
the following to ~/.cargo/config:
[target.armv7-unknown-linux-musleabihf]
linker = "arm-linux-gnueabihf-gcc"
And install the ARM toolchain:
sudo apt-get install gcc-arm-linux-gnueabihf
The development roundtrip can now be shortened by:
cargo build --target=armv7-unknown-linux-musleabihf && \
rsync -vPz target/armv7-unknown-linux-musleabihf/debug/sparsnas [email protected]:/tmp && \
ssh [email protected] "killall -9 sparsnas; /tmp/sparsnas"
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