|Dec 23, 2022
#1624 in Embedded development
An embedded smartwatch written with Rust, using the RTFM framework for multithreading.
- Capacitive touch sense inputs - with support for multitouch gestures
- Full 16bit colour ssd1351 OLED
- Runtime installable apps (see SDK section for more info)
- Real time clock
- Notification alerts via bluetooth
- Buildable on stable rust 2018
Developing applications for the
MWatch tries to follow a modern computer operating system, complete with a kernel, a built in window/display manager along with a user space api for developing user space apps on the watch, as well as some builtin applications.
The window manager handles input and rendering of states/applications inside the watch, all states must implement the
State trait to run but can optionally implement other helper traits which allows the window manager to enable more functionality for a state.
The kernel among otherthings provides an API for the sdk to interact with, this is providided by
lib.rs in the kernel crate. This allows the SDK to properly depend on the kernel, meaning if the kernel implements a new API all that is required for the sdk to use it is to bump the version of the kernel. Currently there is no checking done on the binary the sdk produces to make sure it is compatible with the current running kernel.
MWatch has a builtin bluetooth module connected to
usart2. Through this serial interface we can recieve
Applications and more. The basic procotol looks like this
STX -> TYPE -> (DELIM:DATA)* -> ETX
Can repeat many times based on the type
In english, start byte followed by a type followed by any amount of delimiters followed by data finally ETX. All data must be valid ascii, to send binary data you must convert to hex nibbles first. See the application_manager for more info.
The TSC (touch sense controller) builtin to the
mwatch provides three inputs. The kernel polls these inputs and multiplexes there results to produce a final output. For example touching the middle button produces a middle output, touching the left and right at the same time produces a dual-click output.
- Requires the
thumbv7em-none-eabitarget to be installed, use
rustup target add thumbv7em-none-eabito do so.
cargo-binutilsfor extra features, such as generating a stripped binary. Note: The
llvm-tools-previewcomponent must be installed with
rustup component add llvm-tools-previewfor it to work.
Licensed under either of
at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
Copyright Scott Mabin 2019