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feat: add display UI with splash screen, dashboard, and RSSI sparkline

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Implement full SSD1306 OLED display support:
- Splash screen on boot (1.5s) with project name, version, board
- Dashboard showing radio state, config, counters, RSSI/SNR
- RSSI history sparkline (64-sample ring buffer, 2px-wide bars)
- DisplayOn/DisplayOff host commands routed via dedicated channel
- Pure render functions against generic DrawTarget (no hardware coupling)
- Display on/off control bypasses radio task entirely

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
swaitsandClaude Opus 4.6 committed 2026-03-29 20:42:54 -06:00
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vendor/display-interface-i2c/.cargo-checksum.json
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vendor/display-interface-i2c/.cargo_vcs_info.json
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{
"git": {
"sha1": "b7eb1d0fe4bd995f3dc8d3f5bdccdba4216cc63f"
},
"path_in_vcs": "i2c"
}
vendor/display-interface-i2c/Cargo.toml
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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.75"
name = "display-interface-i2c"
version = "0.5.0"
authors = ["Daniel Egger <daniel@eggers-club.de>"]
exclude = [".gitignore"]
description = "Generic I2C implementation for display interfaces"
documentation = "https://docs.rs/display-interface-i2c"
readme = "README.md"
keywords = [
"graphics",
"display",
"embedded",
]
categories = ["no-std"]
license = "MIT OR Apache-2.0"
repository = "https://github.com/therealprof/display-interface"
[package.metadata.docs.rs]
all-features = true
[dependencies.display-interface]
version = "0.5.0"
[dependencies.embedded-hal]
version = "1.0.0"
[dependencies.embedded-hal-async]
version = "1.0.0"
vendor/display-interface-i2c/LICENSE-APACHE
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vendor/display-interface-i2c/LICENSE-MIT
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Copyright (c) 2018 James Waples
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vendor/display-interface-i2c/README.md
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# I2C interface for display interface
This Rust crate contains a generic I2C implementation of a data/command
interface for displays over any I2C driver implementing the `embedded-hal`/`embedded-hal-async`
`i2c::I2c` trait(s).
## License
Licensed under either of
- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
http://www.apache.org/licenses/LICENSE-2.0)
- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
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.
vendor/display-interface-i2c/src/asynch.rs
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use display_interface::{AsyncWriteOnlyDataCommand, DataFormat, DisplayError};
use crate::I2CInterface;
impl<I2C> AsyncWriteOnlyDataCommand for I2CInterface<I2C>
where
I2C: embedded_hal_async::i2c::I2c,
{
async fn send_commands(&mut self, cmds: DataFormat<'_>) -> Result<(), DisplayError> {
// Copy over given commands to new aray to prefix with command identifier
match cmds {
DataFormat::U8(slice) => {
let mut writebuf: [u8; 8] = [0; 8];
writebuf[1..=slice.len()].copy_from_slice(&slice[0..slice.len()]);
self.i2c
.write(self.addr, &writebuf[..=slice.len()])
.await
.map_err(|_| DisplayError::BusWriteError)
}
_ => Err(DisplayError::DataFormatNotImplemented),
}
}
async fn send_data(&mut self, buf: DataFormat<'_>) -> Result<(), DisplayError> {
match buf {
DataFormat::U8(slice) => {
// No-op if the data buffer is empty
if slice.is_empty() {
return Ok(());
}
let mut writebuf = [0; 17];
// Data mode
writebuf[0] = self.data_byte;
for chunk in slice.chunks(16) {
let chunk_len = chunk.len();
// Copy over all data from buffer, leaving the data command byte intact
writebuf[1..=chunk_len].copy_from_slice(chunk);
self.i2c
.write(self.addr, &writebuf[0..=chunk_len])
.await
.map_err(|_| DisplayError::BusWriteError)?;
}
Ok(())
}
DataFormat::U8Iter(iter) => {
let mut writebuf = [0; 17];
let mut i = 1;
let len = writebuf.len();
// Data mode
writebuf[0] = self.data_byte;
for byte in iter.into_iter() {
writebuf[i] = byte;
i += 1;
if i == len {
self.i2c
.write(self.addr, &writebuf[0..=len])
.await
.map_err(|_| DisplayError::BusWriteError)?;
i = 1;
}
}
if i > 1 {
self.i2c
.write(self.addr, &writebuf[0..=i])
.await
.map_err(|_| DisplayError::BusWriteError)?;
}
Ok(())
}
_ => Err(DisplayError::DataFormatNotImplemented),
}
}
}
vendor/display-interface-i2c/src/lib.rs
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//! Generic I2C interface for display drivers
#![no_std]
mod asynch;
use display_interface::{DataFormat, DisplayError, WriteOnlyDataCommand};
/// I2C communication interface
pub struct I2CInterface<I2C> {
i2c: I2C,
addr: u8,
data_byte: u8,
}
impl<I2C> I2CInterface<I2C> {
/// Create new I2C interface for communication with a display driver
pub fn new(i2c: I2C, addr: u8, data_byte: u8) -> Self {
Self {
i2c,
addr,
data_byte,
}
}
/// Consume the display interface and return
/// the underlying peripheral driver
pub fn release(self) -> I2C {
self.i2c
}
}
impl<I2C> WriteOnlyDataCommand for I2CInterface<I2C>
where
I2C: embedded_hal::i2c::I2c,
{
fn send_commands(&mut self, cmds: DataFormat<'_>) -> Result<(), DisplayError> {
// Copy over given commands to new aray to prefix with command identifier
match cmds {
DataFormat::U8(slice) => {
let mut writebuf: [u8; 8] = [0; 8];
writebuf[1..=slice.len()].copy_from_slice(&slice[0..slice.len()]);
self.i2c
.write(self.addr, &writebuf[..=slice.len()])
.map_err(|_| DisplayError::BusWriteError)
}
_ => Err(DisplayError::DataFormatNotImplemented),
}
}
fn send_data(&mut self, buf: DataFormat<'_>) -> Result<(), DisplayError> {
match buf {
DataFormat::U8(slice) => {
// No-op if the data buffer is empty
if slice.is_empty() {
return Ok(());
}
let mut writebuf = [0; 17];
// Data mode
writebuf[0] = self.data_byte;
slice
.chunks(16)
.try_for_each(|c| {
let chunk_len = c.len();
// Copy over all data from buffer, leaving the data command byte intact
writebuf[1..=chunk_len].copy_from_slice(c);
self.i2c.write(self.addr, &writebuf[0..=chunk_len])
})
.map_err(|_| DisplayError::BusWriteError)
}
DataFormat::U8Iter(iter) => {
let mut writebuf = [0; 17];
let mut i = 1;
let len = writebuf.len();
// Data mode
writebuf[0] = self.data_byte;
for byte in iter.into_iter() {
writebuf[i] = byte;
i += 1;
if i == len {
self.i2c
.write(self.addr, &writebuf[0..=len])
.map_err(|_| DisplayError::BusWriteError)?;
i = 1;
}
}
if i > 1 {
self.i2c
.write(self.addr, &writebuf[0..=i])
.map_err(|_| DisplayError::BusWriteError)?;
}
Ok(())
}
_ => Err(DisplayError::DataFormatNotImplemented),
}
}
}