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Rewrite firmware: use postcard over USB MIDI (SysEx)

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daylily
2026-01-09 16:34:50 +08:00
parent efc503df33
commit c0c65f1fae
17 changed files with 911 additions and 1175 deletions
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firmware/.gitignore
+1 -1
View File
@@ -1 +1 @@
/target
target/
firmware/Cargo.lock
Generated
+310 -130
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@@ -4,9 +4,9 @@ version = 4
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firmware/LICENSE
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View File
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
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firmware/README.md
+2
View File
@@ -1,5 +1,7 @@
# Inkclip Firmware
> WARNING! Contents below are outdated; we are currently using a USB MIDI-based firmware for better cross-platform compatibility.
This is the firmware implementation for Inkclip. It implements a USB 2.0 HID device with the following reports:
- **Write Pattern:** Report ID = 0x01, Direction = Output (host to device), Size = 5,000 bytes.
firmware/src/app.rs
+247
View File
@@ -0,0 +1,247 @@
use core::cmp::Ordering;
use crate::{
epd::Epd,
midi::UsbMidi,
pack::{decode_7in8, encode_7in8},
sysex::{SysExEncoder, SysExParser},
uid::uid_base64,
};
use defmt::{error, info, warn};
use embassy_executor::task;
use embassy_usb::driver::EndpointError;
use embedded_graphics::prelude::*;
use epd_waveshare::{epd1in54::Display1in54, prelude::*};
use serde::{Deserialize, Serialize};
#[derive(Serialize)]
enum DeviceType {
BWRev1, // Black-and-white, API Rev. 1
}
#[derive(Deserialize)]
enum Chroma {
Black,
}
#[derive(Deserialize)]
enum Request<'a> {
GetIdentification,
UpdateDisplay,
SetPattern {
from: u32,
to: u32,
chroma: Chroma,
pattern: &'a [u8],
},
}
#[derive(Serialize)]
enum Response<'a> {
GetIdentification { serial: &'a str, model: DeviceType },
UpdateDisplay,
SetPattern,
}
const PATTERN_SIZE: usize = 5000;
const MAGIC_NUMBER_LEN: usize = 1;
const MAGIC_NUMBER: [u8; MAGIC_NUMBER_LEN] = [0x7d]; // Generic educational/R&D
#[task]
pub async fn app_task(epd: Epd, midi: UsbMidi) {
App {
epd,
midi,
pattern: [0; PATTERN_SIZE],
}
.run()
.await
}
struct App {
epd: Epd,
midi: UsbMidi,
pattern: [u8; PATTERN_SIZE],
}
impl App {
async fn handle_request<'a>(&mut self, req: Request<'a>) {
match req {
Request::SetPattern {
from,
to,
chroma,
pattern,
} => self.handle_set_pattern(from, to, chroma, pattern).await,
Request::UpdateDisplay => self.handle_update_display().await,
Request::GetIdentification => self.handle_get_identification().await,
}
}
async fn handle_set_pattern(&mut self, from: u32, to: u32, _chroma: Chroma, pattern: &[u8]) {
let from = from as usize;
let to = to as usize;
if from >= PATTERN_SIZE || to > PATTERN_SIZE || from > to {
warn!(
"SetPattern: 'from' and/or 'to' out of range (from = {}, to = {}, PATTERN_SIZE = {})",
from, to, PATTERN_SIZE
);
return;
}
let buf_size = match pattern.len().cmp(&(to - from)) {
Ordering::Less => {
warn!(
"SetPattern buffer too short (buf_size = {}, range_size = {})",
pattern.len(),
to - from,
);
pattern.len()
}
Ordering::Equal => pattern.len(),
Ordering::Greater => {
warn!(
"SetPattern buffer too long; truncating (buf_size = {}, range_size = {})",
pattern.len(),
to - from,
);
to - from
}
};
for (stride, &byte) in pattern[..buf_size].iter().enumerate() {
self.pattern[from + stride] = byte;
}
self.write_response(Response::SetPattern).await;
}
async fn handle_update_display(&mut self) {
let mut display = Display1in54::default();
display.set_rotation(DisplayRotation::Rotate180);
let width = display.size().width as i32;
for (stride, &byte) in self.pattern.iter().enumerate() {
for stroll in 0..8 {
let ix = stride as i32 * 8 + stroll;
let x = ix % width;
let y = ix / width;
display.set_pixel(Pixel(Point { x, y }, color_at(byte, stroll)));
}
}
self.epd.update_display(&display);
self.write_response(Response::UpdateDisplay).await;
}
async fn handle_get_identification(&mut self) {
self.write_response(Response::GetIdentification {
serial: uid_base64(),
model: DeviceType::BWRev1,
})
.await;
}
async fn write_response<'a>(&mut self, resp: Response<'a>) -> bool {
const RESP_N: usize = 1024;
let mut resp_buffer = [0u8; RESP_N];
let Ok(payload_slice) = postcard::to_slice(&resp, &mut resp_buffer) else {
error!("write_response: postcard encoding overflows the buffer");
return false;
};
let mut encode_buffer = [0u8; RESP_N];
encode_buffer[..MAGIC_NUMBER_LEN].copy_from_slice(&MAGIC_NUMBER);
let Some(encoded_len) = encode_7in8(payload_slice, &mut encode_buffer[MAGIC_NUMBER_LEN..])
else {
error!("write_response: 7-in-8 encoding overflows the buffer");
return false;
};
let mut sysex_encoder = SysExEncoder::<1024>::new();
let Some(encoded) = sysex_encoder.encode(&encode_buffer[..MAGIC_NUMBER_LEN + encoded_len])
else {
error!("write_response: USB MIDI encoding overflows the buffer");
return false;
};
for chunk in encoded.chunks(64) {
let Ok(_) = self.midi.write_packet(chunk).await else {
error!("write_response: failed to write response");
return false;
};
}
true
}
pub async fn run(&mut self) {
let mut sysex_parser = SysExParser::<8192>::new();
'_connection: loop {
self.midi.wait_connection().await;
'packet: loop {
let mut packet_in_buf = [0u8; 64];
match self.midi.read_packet(&mut packet_in_buf).await {
Err(EndpointError::BufferOverflow) => {
error!(
"App: read more than 64 bytes at once from EP. This should not be happening!"
)
}
Err(EndpointError::Disabled) => {
info!("App: EP has been disabled; waiting to be enabled again.");
break 'packet;
}
Ok(nread) => {
for midi_packet in packet_in_buf[..nread].chunks_exact(4) {
let Some(midi_msg) = sysex_parser.feed(midi_packet) else {
continue;
};
let midi_msg_len = midi_msg.len();
if midi_msg_len < 2
|| midi_msg[0] != 0xf0
|| midi_msg[midi_msg_len - 1] != 0xf7
{
warn!("App: MIDI event not SysEx; dropping.");
continue;
}
let sysex = &mut midi_msg[1..midi_msg_len - 1];
if sysex.len() < MAGIC_NUMBER_LEN
|| sysex[..MAGIC_NUMBER_LEN] != MAGIC_NUMBER
{
warn!(
"App: SysEx does not start with magic number; first {} bytes = {}. dropping.",
MAGIC_NUMBER,
sysex[..MAGIC_NUMBER_LEN]
);
continue;
}
let Ok(parsed) = postcard::from_bytes::<Request>(decode_7in8(
&mut sysex[MAGIC_NUMBER_LEN..],
)) else {
warn!("App: cannot parse payload. dropping.");
continue;
};
self.handle_request(parsed).await;
}
}
}
}
}
}
}
fn color_at(byte: u8, ix: i32) -> Color {
debug_assert!(0 <= ix && ix < 8);
if byte & (1u8 << ix) == 0 {
Color::White
} else {
Color::Black
}
}
firmware/src/app/descriptor.rs
-23
View File
@@ -1,23 +0,0 @@
use usbd_hid::descriptor::generator_prelude::*;
// Watch out the terminology!
// - An "output" report is a report from the host to the device (as the device is the one doing the output);
// - An "input" report is a report from the device to the host (as it is presumably triggered by user input).
#[gen_hid_descriptor(
(usage_page = VENDOR_DEFINED_END, usage = 0x01, collection = APPLICATION) = {
(report_id = 0x01, usage = 0x02) = {
write_pattern = output;
};
(report_id = 0x02, usage = 0x03) = {
serial_number_request = output;
};
(report_id = 0x02, usage = 0x03) = {
serial_number_response = input;
};
}
)]
pub struct HIDReports {
write_pattern: [u8; 5000],
serial_number_request: u8,
serial_number_response: [u8; 16],
}
firmware/src/app/mod.rs
-86
View File
@@ -1,86 +0,0 @@
use defmt::*;
use embedded_graphics::prelude::*;
use epd_waveshare::epd1in54_v2::Display1in54;
use epd_waveshare::prelude::*;
use crate::device::epd::Epd;
use crate::device::usb_hid::Hid;
use crate::util::{uid_base64, uid_base64_bytes};
pub mod descriptor;
pub const USB_READ_BUFFER_SIZE: usize = 8192;
pub const USB_WRITE_BUFFER_SIZE: usize = 32;
const WRITE_PATTERN_REPORT_ID: u8 = 0x01;
const SERIAL_NUMBER_REPORT_ID: u8 = 0x02;
fn color_at(byte: u8, ix: i32) -> Color {
defmt::debug_assert!(0 <= ix && ix < 8);
if byte & (1u8 << ix) == 0 {
Color::White
} else {
Color::Black
}
}
pub struct MainLoop<'a> {
pub hid: Hid<'a, USB_READ_BUFFER_SIZE, USB_WRITE_BUFFER_SIZE>,
pub epd: Epd,
}
impl<'a> MainLoop<'a> {
fn draw_pattern(&mut self, buf: &[u8]) {
debug!("Updating display");
let mut buf_size = buf.len();
if buf_size < 5000 {
warn!("WRITE_PATTERN buffer too short (buf_size = {})", buf_size);
} else if buf_size > 5000 {
warn!(
"WRITE_PATTERN buffer too long; truncating (buf_size = {})",
buf_size
);
buf_size = 5000;
}
let mut display = Display1in54::default();
display.set_rotation(DisplayRotation::Rotate180);
let width = display.size().width as i32;
for (stride, &byte) in buf[..buf_size].iter().enumerate() {
for stroll in 0..8 {
let ix = stride as i32 * 8 + stroll;
let x = ix % width;
let y = ix / width;
display.set_pixel(Pixel(Point { x, y }, color_at(byte, stroll)));
}
}
self.epd.update_display(&display);
}
async fn send_serial_number(&mut self) {
debug!("Sending serial number {}", uid_base64());
self.hid
.write(SERIAL_NUMBER_REPORT_ID, uid_base64_bytes())
.await;
}
pub async fn run(&mut self) -> ! {
let mut read_buf = [0u8; USB_READ_BUFFER_SIZE];
loop {
let (id, buf) = self.hid.read(&mut read_buf).await;
match id {
WRITE_PATTERN_REPORT_ID => self.draw_pattern(buf),
SERIAL_NUMBER_REPORT_ID => self.send_serial_number().await,
_ => warn!("Unknown report ID: {}", buf[0]),
}
}
}
}
firmware/src/device/mod.rs
-2
View File
@@ -1,2 +0,0 @@
pub mod epd;
pub mod usb_hid;
firmware/src/device/usb_hid.rs
-120
View File
@@ -1,120 +0,0 @@
use defmt::*;
use embassy_stm32::peripherals::USB_OTG_FS;
use embassy_stm32::usb::{self, DmPin, DpPin};
use embassy_usb::class::hid::{self, HidReader, HidReaderWriter, HidWriter};
use embassy_usb::driver::EndpointError;
use crate::init::Irqs;
pub type UsbBuilder<'d> = embassy_usb::Builder<'d, usb::Driver<'d, USB_OTG_FS>>;
pub fn get_usb_builder<'d>(
usb_peri: USB_OTG_FS,
dp: impl DpPin<USB_OTG_FS>,
dm: impl DmPin<USB_OTG_FS>,
ep_out_buffer: &'d mut [u8],
driver_config: usb::Config,
builder_config: embassy_usb::Config<'d>,
config_descriptor: &'d mut [u8],
bos_descriptor: &'d mut [u8],
msos_descriptor: &'d mut [u8],
control_buf: &'d mut [u8],
) -> UsbBuilder<'d> {
let driver = usb::Driver::new_fs(usb_peri, Irqs, dp, dm, ep_out_buffer, driver_config);
return embassy_usb::Builder::new(
driver,
builder_config,
config_descriptor,
bos_descriptor,
msos_descriptor,
control_buf,
);
}
pub struct Hid<'d, const READ_N: usize, const WRITE_N: usize> {
reader: HidReader<'d, usb::Driver<'d, USB_OTG_FS>, READ_N>,
writer: HidWriter<'d, usb::Driver<'d, USB_OTG_FS>, WRITE_N>,
}
impl<'d, const READ_N: usize, const WRITE_N: usize> Hid<'d, READ_N, WRITE_N> {
pub fn new(
usb_builder: &mut UsbBuilder<'d>,
report_descriptor: &'d [u8],
state: &'d mut hid::State<'d>,
) -> Hid<'d, READ_N, WRITE_N> {
let hid_config = hid::Config {
report_descriptor,
request_handler: None,
poll_ms: 10,
max_packet_size: 64,
};
let (reader, writer) = HidReaderWriter::new(usb_builder, state, hid_config).split();
return Hid { reader, writer };
}
async fn internal_read<'a, const USE_ID: bool>(
&mut self,
buf: &'a mut [u8; READ_N],
) -> (u8, &'a [u8]) {
loop {
match self.reader.read(buf).await {
Ok(len) => {
if USE_ID {
if len < 1 {
warn!("Received no report ID")
} else {
return (buf[0], &buf[1..len]);
}
} else {
return (0, &buf[..len]);
}
}
Err(hid::ReadError::BufferOverflow) => {
warn!("Buffer overflow when reading from host")
}
Err(hid::ReadError::Disabled) => {
info!("Endpoint disabled");
self.reader.ready().await
}
Err(hid::ReadError::Sync(_)) => defmt::unreachable!(),
}
}
}
pub async fn read<'a>(&mut self, buf: &'a mut [u8; READ_N]) -> (u8, &'a [u8]) {
self.internal_read::<true>(buf).await
}
#[allow(dead_code)]
pub async fn read_no_id<'a>(&mut self, buf: &'a mut [u8; READ_N]) -> &'a [u8] {
self.internal_read::<false>(buf).await.1
}
pub async fn write(&mut self, id: u8, report: &[u8]) {
let payload_size = report.len() + 1;
if payload_size > WRITE_N {
error!(
"Buffer overflow when writing to host (report_size = {})",
payload_size
);
return;
}
let mut payload = [id; WRITE_N];
payload[1..payload_size].copy_from_slice(report);
self.writer
.write(&payload[..payload_size])
.await
.unwrap_or_else(|err| match err {
EndpointError::BufferOverflow => error!("Buffer overflow when writing to host"),
EndpointError::Disabled => warn!("Endpoint disabled"),
});
info!("Written report #{}: {}", id, report);
}
}
firmware/src/device/epd.rs → firmware/src/epd.rs
+13 -9
View File
@@ -1,3 +1,4 @@
use embassy_stm32::Peri;
use embassy_stm32::gpio::{self, Level, Pull, Speed};
use embassy_stm32::spi::{self, MosiPin, SckPin, Spi};
use embassy_stm32::time::Hertz;
@@ -8,8 +9,11 @@ use epd_waveshare::epd1in54::Display1in54;
use epd_waveshare::epd1in54_v2::Epd1in54;
use epd_waveshare::prelude::*;
type EpdSpiDevice =
ExclusiveDevice<Spi<'static, embassy_stm32::mode::Blocking>, gpio::Output<'static>, Delay>;
type EpdSpiDevice = ExclusiveDevice<
Spi<'static, embassy_stm32::mode::Blocking, spi::mode::Master>,
gpio::Output<'static>,
Delay,
>;
pub struct Epd {
spi_device: EpdSpiDevice,
@@ -24,13 +28,13 @@ pub struct Epd {
impl Epd {
pub fn new<SPI: spi::Instance>(
spi: SPI,
cs: impl gpio::Pin,
sck: impl SckPin<SPI>,
mosi: impl MosiPin<SPI>,
busy: impl gpio::Pin,
dc: impl gpio::Pin,
rst: impl gpio::Pin,
spi: Peri<'static, SPI>,
cs: Peri<'static, impl gpio::Pin>,
sck: Peri<'static, impl SckPin<SPI>>,
mosi: Peri<'static, impl MosiPin<SPI>>,
busy: Peri<'static, impl gpio::Pin>,
dc: Peri<'static, impl gpio::Pin>,
rst: Peri<'static, impl gpio::Pin>,
) -> Epd {
let cs_pin = gpio::Output::new(cs, Level::High, Speed::VeryHigh);
let busy_pin = gpio::Input::new(busy, Pull::Down);
firmware/src/init.rs
-35
View File
@@ -1,35 +0,0 @@
use embassy_stm32::bind_interrupts;
use embassy_stm32::peripherals::USB_OTG_FS;
use embassy_stm32::time::Hertz;
use embassy_stm32::usb;
use embassy_stm32::{Config, Peripherals};
bind_interrupts!(pub struct Irqs {
OTG_FS => usb::InterruptHandler<USB_OTG_FS>;
});
pub fn init_peripherals() -> Peripherals {
let mut config = Config::default();
{
use embassy_stm32::rcc::*;
config.rcc.hse = Some(Hse {
freq: Hertz(12_000_000),
mode: HseMode::Oscillator,
});
config.rcc.pll_src = PllSource::HSE;
config.rcc.pll = Some(Pll {
prediv: PllPreDiv::DIV12, // 12 / 12 = 1 MHz
mul: PllMul::MUL192, // 1 * 192 = 192 MHz
divp: Some(PllPDiv::DIV2), // 192 / 2 = 96 MHz <= 100 MHz max freq
divq: Some(PllQDiv::DIV4), // 192 / 4 = 48 MHz necessary for USB
divr: None,
});
config.rcc.ahb_pre = AHBPrescaler::DIV1;
config.rcc.apb1_pre = APBPrescaler::DIV2;
config.rcc.apb2_pre = APBPrescaler::DIV4;
config.rcc.sys = Sysclk::PLL1_P;
config.rcc.mux.clk48sel = mux::Clk48sel::PLL1_Q;
}
return embassy_stm32::init(config);
}
firmware/src/main.rs
+62 -65
View File
@@ -1,79 +1,76 @@
#![no_main]
#![no_std]
#![feature(impl_trait_in_assoc_type)]
use defmt::*;
use embassy_executor::Spawner;
use embassy_futures::join::join;
use crate::{
app::app_task,
epd::Epd,
midi::{make_midi_class, make_usb_builder, usb_task},
};
use defmt_rtt as _;
use embassy_executor::{Spawner, main};
use embassy_stm32::{
Peripherals, bind_interrupts,
peripherals::USB_OTG_FS,
time::Hertz,
usb::{self},
};
use panic_probe as _;
use device::epd::Epd;
use device::usb_hid::Hid;
use device::usb_hid::get_usb_builder;
use embassy_stm32::usb;
use embassy_usb::UsbVersion;
use embassy_usb::class::hid;
use usbd_hid::descriptor::generator_prelude::*;
use init::init_peripherals;
use util::uid_base64;
use app::MainLoop;
use app::descriptor::HIDReports;
use {defmt_rtt as _, panic_probe as _};
macro_rules! static_ref {
($ty:ty = $expr:expr) => {{
static CELL: static_cell::StaticCell<$ty> = StaticCell::new();
CELL.init($expr)
}};
}
mod app;
mod device;
mod init;
mod util;
mod epd;
mod midi;
mod pack;
mod sysex;
mod uid;
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
bind_interrupts!(pub struct Irqs {
OTG_FS => usb::InterruptHandler<USB_OTG_FS>;
});
fn init_peripherals() -> Peripherals {
embassy_stm32::init({
use embassy_stm32::rcc::*;
let mut config = embassy_stm32::Config::default();
config.rcc.hse = Some(Hse {
freq: Hertz(12_000_000),
mode: HseMode::Oscillator,
});
config.rcc.pll_src = PllSource::HSE;
config.rcc.pll = Some(Pll {
prediv: PllPreDiv::DIV12, // 12 / 12 = 1 MHz
mul: PllMul::MUL192, // 1 * 192 = 192 MHz
divp: Some(PllPDiv::DIV2), // 192 / 2 = 96 MHz <= 100 MHz max freq
divq: Some(PllQDiv::DIV4), // 192 / 4 = 48 MHz necessary for USB
divr: None,
});
config.rcc.ahb_pre = AHBPrescaler::DIV1;
config.rcc.apb1_pre = APBPrescaler::DIV2;
config.rcc.apb2_pre = APBPrescaler::DIV4;
config.rcc.sys = Sysclk::PLL1_P;
config.rcc.mux.clk48sel = mux::Clk48sel::PLL1_Q;
config
})
}
#[main]
async fn main(spawner: Spawner) {
let peri = init_peripherals();
info!("Initialized peripherals");
let epd = Epd::new(
peri.SPI1, peri.PA4, peri.PA5, peri.PA7, peri.PB10, peri.PB0, peri.PB1,
);
info!("Established SPI link to e-paper display");
let mut usb_builder = make_usb_builder(peri.USB_OTG_FS, peri.PA12, peri.PA11);
let midi = make_midi_class(&mut usb_builder);
let mut ep_out_buffer = [0u8; 256];
let mut config_descriptor = [0; 256];
let mut control_buf = [0; 256];
let mut state = hid::State::new();
let mut builder_config = embassy_usb::Config::new(0x1209, 0xc9c9);
builder_config.manufacturer = Some("daylily");
builder_config.product = Some("“Inkclip” 1.54″ ePaper Accessory");
builder_config.serial_number = Some(uid_base64());
// Caution: past USB 2.0 (including USB 2.1 aka 2.0 LPM), BOS descriptors become necessary
builder_config.bcd_usb = UsbVersion::Two;
let mut builder = get_usb_builder(
peri.USB_OTG_FS,
peri.PA12,
peri.PA11,
&mut ep_out_buffer,
usb::Config::default(),
builder_config,
&mut config_descriptor,
&mut [], // USB 2.0 does not require BOS descriptors
&mut [], // Non vendor-specific devices/interfaces do not require MS OS descriptors
&mut control_buf,
);
let usb_hid = Hid::new(&mut builder, HIDReports::desc(), &mut state);
let mut main_loop = MainLoop { epd, hid: usb_hid };
let main_fut = main_loop.run();
let mut usb_device = builder.build();
let usb_fut = usb_device.run();
info!("Initialized USB HID device");
join(main_fut, usb_fut).await;
spawner.must_spawn(usb_task(usb_builder));
spawner.must_spawn(app_task(epd, midi));
}
firmware/src/midi.rs
+52
View File
@@ -0,0 +1,52 @@
use defmt_rtt as _;
use embassy_executor::task;
use embassy_stm32::{
Peri,
peripherals::USB_OTG_FS,
usb::{self, DmPin, DpPin},
};
use embassy_usb::{UsbVersion, class::midi::MidiClass};
use panic_probe as _;
use static_cell::StaticCell;
use crate::{Irqs, uid};
pub type UsbDriver = usb::Driver<'static, USB_OTG_FS>;
pub type UsbBuilder = embassy_usb::Builder<'static, UsbDriver>;
pub type UsbMidi = MidiClass<'static, UsbDriver>;
pub fn make_usb_builder(
peri: Peri<'static, USB_OTG_FS>,
dp: Peri<'static, impl DpPin<USB_OTG_FS>>,
dm: Peri<'static, impl DmPin<USB_OTG_FS>>,
) -> UsbBuilder {
let ep_out_buffer = static_ref!([u8; 4096] = [0; 4096]);
let config_descriptor = static_ref!([u8; 256] = [0; 256]);
let control_buf = static_ref!([u8; 256] = [0; 256]);
let mut config = embassy_usb::Config::new(0x1209, 0xc9c9);
config.manufacturer = Some("Project Daylily");
config.product = Some("Inkclip BW");
config.serial_number = Some(uid::uid_base64());
config.bcd_usb = UsbVersion::Two;
let usb_driver = usb::Driver::new_fs(peri, Irqs, dp, dm, ep_out_buffer, usb::Config::default());
embassy_usb::Builder::new(
usb_driver,
config,
config_descriptor,
&mut [],
&mut [],
control_buf,
)
}
pub fn make_midi_class(builder: &mut UsbBuilder) -> UsbMidi {
UsbMidi::new(builder, 1, 1, 64)
}
#[task]
pub async fn usb_task(builder: UsbBuilder) -> ! {
let mut device = builder.build();
device.run().await;
}
firmware/src/pack.rs
+51
View File
@@ -0,0 +1,51 @@
// 7-in-8 encoding. Each 7 bytes can be encoded into 8 bytes with all-0 MSB's. This is useful
// for sending data over exotic protocols like MIDI SysEx.
// Decode in-place, returning the decoded slice.
pub fn decode_7in8(payload: &mut [u8]) -> &mut [u8] {
let mut decoded_len = 0;
for stride in 0..payload.len().div_ceil(8) {
// Most significant bits of a 7-in-8 group
let msbs = payload[8 * stride];
for stroll in 1..8 {
let in_ix = 8 * stride + stroll;
if in_ix >= payload.len() {
break;
}
payload[decoded_len] =
(payload[in_ix] & 0b01111111) | ((msbs << (8 - stroll)) & 0b10000000);
decoded_len += 1;
}
}
&mut payload[..decoded_len]
}
// Encode into provided output buffer, returning the length of the output, or None if the buffer is too small.
pub fn encode_7in8<'a>(payload: &[u8], output: &'a mut [u8]) -> Option<usize> {
let mut encoded_len = 0;
for stride in 0..payload.len().div_ceil(7) {
let msbs_ix = encoded_len;
if encoded_len >= output.len() {
return None;
}
output[msbs_ix] = 0;
encoded_len += 1;
for stroll in 1..8 {
let in_ix = 7 * stride + stroll - 1;
if in_ix >= payload.len() {
break;
}
if encoded_len >= output.len() {
return None;
}
output[msbs_ix] |= (payload[in_ix] & 0b10000000) >> (8 - stroll);
output[encoded_len] = payload[in_ix] & 0b01111111;
encoded_len += 1;
}
}
Some(encoded_len)
}
firmware/src/sysex.rs
+141
View File
@@ -0,0 +1,141 @@
use defmt::{error, warn};
pub struct SysExParser<const N: usize> {
buf: [u8; N],
len: usize,
}
impl<const N: usize> SysExParser<N> {
pub fn new() -> Self {
SysExParser {
buf: [0u8; N],
len: 0,
}
}
pub fn feed(&mut self, packet: &[u8]) -> Option<&mut [u8]> {
if packet.len() != 4 {
error!(
"Got a UDB MIDI packet of length {} != 4; dropping",
packet.len()
);
return None;
}
match packet[0] & 0x0f {
0x04 => self.extend_buf(&packet[1..]),
0x05 => self.extend_buf_fin(&packet[1..2]),
0x06 => self.extend_buf_fin(&packet[1..3]),
0x07 => self.extend_buf_fin(&packet[1..4]),
_ => self.reset(),
}
}
fn extend_buf(&mut self, data: &[u8]) -> Option<&mut [u8]> {
let new_len = self.len + data.len();
if new_len > N {
warn!("USB MIDI parsing overflowed buffer! Discarding partially parsed payload.");
self.len = 0;
return None;
}
self.buf[self.len..new_len].copy_from_slice(data);
self.len = new_len;
None
}
fn extend_buf_fin(&mut self, data: &[u8]) -> Option<&mut [u8]> {
let new_len = self.len + data.len();
if new_len > N {
warn!("USB MIDI parsing overflowed buffer! Discarding partially parsed payload.");
self.len = 0;
return None;
}
self.buf[self.len..new_len].copy_from_slice(data);
self.len = new_len;
let result = &mut self.buf[..self.len];
self.len = 0;
Some(result)
}
fn reset(&mut self) -> Option<&mut [u8]> {
self.len = 0;
None
}
}
pub struct SysExEncoder<const N: usize> {
buf: [u8; N],
len: usize,
}
impl<const N: usize> SysExEncoder<N> {
pub fn new() -> Self {
SysExEncoder {
buf: [0u8; N],
len: 0,
}
}
fn clear(&mut self) {
self.len = 0;
}
fn feed(&mut self, data: &[u8; 3]) -> bool {
if self.len + 4 > N {
error!("Encoding more would overflow the buffer");
return false;
}
self.buf[self.len] = 0x04;
self.buf[self.len + 1] = data[0];
self.buf[self.len + 2] = data[1];
self.buf[self.len + 3] = data[2];
self.len += 4;
true
}
fn feed_fin(&mut self, n: u8, data: &[u8; 3]) -> Option<&[u8]> {
if n == 0 || n > 3 {
error!("Inconsistent number of bytes");
return None;
}
if self.len + 4 > N {
error!("Encoding more would overflow the buffer");
return None;
}
self.buf[self.len] = 0x04 + n;
self.buf[self.len + 1] = data[0];
self.buf[self.len + 2] = data[1];
self.buf[self.len + 3] = data[2];
self.len += 4;
Some(&self.buf[..self.len])
}
pub fn encode(&mut self, data: &[u8]) -> Option<&[u8]> {
self.clear();
if data.len() == 0 {
return self.feed_fin(2, &[0xf0, 0xf7, 0x00]);
}
if data.len() == 1 {
return self.feed_fin(3, &[0xf0, data[0], 0xf7]);
}
self.feed(&[0xf0, data[0], data[1]]);
for chunk in data[2..].chunks(3) {
match chunk.len() {
3 => {
if !self.feed(&[chunk[0], chunk[1], chunk[2]]) {
return None;
}
}
2 => return self.feed_fin(3, &[chunk[0], chunk[1], 0xf7]),
1 => return self.feed_fin(2, &[chunk[0], 0xf7, 0x00]),
_ => unreachable!(),
}
}
self.feed_fin(1, &[0xf7, 0x00, 0x00])
}
}
firmware/src/util.rs → firmware/src/uid.rs
+1 -1
View File
@@ -6,7 +6,7 @@ pub fn uid_base64() -> &'static str {
}
#[allow(static_mut_refs)]
pub fn uid_base64_bytes() -> &'static [u8] {
pub fn uid_base64_bytes() -> &'static [u8; 16] {
static mut UID_BASE64: [u8; 16] = [0; 16];
static mut LOADED: bool = false;
critical_section::with(|_| unsafe {