The purpose of this repository is to serve as a proof of concept of a potential WASI and I2C integration.
Currently, the setup is as follows: Raspberry Pi 4 Model B → I2C Interface → HD44780 LCD. It is my intention to switch out the Pi for a Pi Pico microcontroller, to have a proof of concept for a more constrained piece of hardware. I also have a Pi 3 Model B hooked up with a HTS221.
The embedded-hal crate is the main inspiration for the design of the API. To embed a crate that uses this HAL as a guest component wasi-embedded-hal can be used.
For this criterion.rs is used. Sadly, it isn't possible to use this in conjunction with a binary crate, thus the crate is split up into a library and a binary.
Benchmarks can be found in the benches/ directory inside the hosts and native implementations.
The executable is built via cargo bench --no-run. Afterwards it can be scp'ed and run using ./sensor_read-a3122c62d6d7e506 --bench. The results are stored inside target/criterion/sensor\\\ read/report and are then scp'ed back into report/.
The used memory is collected via dhat-rs. This gives output of the following format after execution:
dhat: Total: xxx bytes in y blocks
dhat: At t-gmax: xxx bytes in y blocks
dhat: At t-end: xxx bytes in y blocks
To build run cargo build --target aarch64-unknown-linux-gnu --release --features dhat-heap.