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|
//! Take USB keyboard reports and echo them over I²C.
#![no_std]
#![no_main]
mod dotstar;
mod logger;
mod macros;
mod rtc;
use atsamd_usb_host::SAMDHost;
use bootkbd::BootKeyboard;
use clint::HandlerArray;
use core::mem;
use core::panic::PanicInfo;
use cortex_m::asm::wfi;
use cortex_m_rt::{entry, exception, ExceptionFrame};
use embedded_hal::{blocking::i2c::Write, digital::v2::OutputPin};
use log::{info, LevelFilter};
use smart_leds::colors;
use smart_leds_trait::SmartLedsWrite;
use trinket_m0::{
self as hal,
clock::GenericClockController,
gpio::{OpenDrain, Output, Pa10, Pa6, Pa7, PfD},
sercom,
target_device::{interrupt, Interrupt},
time::*,
CorePeripherals, Peripherals,
};
use usb_host::Driver;
// A very unsafe copy of an LED to turn on when things go really, really wrong.
static mut LED: usize = 0;
// I²C address to send keyboard reports to.
const NRF_WIREADDR: u8 = 4;
// Interrupt handler table.
static HANDLERS: HandlerArray = HandlerArray::new();
#[entry]
fn main() -> ! {
let mut cp = CorePeripherals::take().expect("taking core peripherals");
let mut dp = Peripherals::take().expect("taking device peripherals");
let mut clocks = GenericClockController::with_internal_32kosc(
dp.GCLK,
&mut dp.PM,
&mut dp.SYSCTRL,
&mut dp.NVMCTRL,
);
let mut pins = hal::Pins::new(dp.PORT);
let uart = hal::uart(
&mut clocks,
115_200.hz(),
dp.SERCOM0,
&mut cp.NVIC,
&mut dp.PM,
pins.d3,
pins.d4,
&mut pins.port,
);
let mut i2c_master = hal::i2c_master(
&mut clocks,
400_000.hz(),
dp.SERCOM2,
&mut dp.PM,
pins.d0,
pins.d2,
&mut pins.port,
);
let mut red_led = pins.d13.into_open_drain_output(&mut pins.port);
red_led.set_low().expect("turning off red LED");
unsafe { LED = mem::transmute(&red_led) }
let mut dotstar = dotstar::new(
dp.SERCOM1,
pins.swdio,
pins.dotstar_di,
pins.dotstar_ci,
&mut pins.port,
&mut dp.PM,
&mut clocks,
);
let black = [colors::BLACK];
dotstar
.write(black.iter().cloned())
.expect("turning off dotstar");
// We do the transmute because, while all the underlying data is
// static, we're unable to get a referecence to the UART or LED
// until run-time. Another option would be to use Option in the
// SerialLogger definition, but that requires a check every time
// they might be used.
let uart_wrapped = logger::WriteWrapper::new(uart);
let logger = logger::SerialLogger::new(uart_wrapped, red_led);
// Wow, would I love to not be annotating this type.
let logger_ref: &'static logger::SerialLogger<
sercom::UART0<sercom::Sercom0Pad3<Pa7<PfD>>, sercom::Sercom0Pad2<Pa6<PfD>>, (), ()>,
Pa10<Output<OpenDrain>>,
> = unsafe { mem::transmute(&logger) };
unsafe { log::set_logger_racy(logger_ref).expect("couldn't set logger") };
log::set_max_level(LevelFilter::Trace);
let mut rtc_handler = rtc::setup(dp.RTC, &mut clocks);
let (mut usb_host, mut usb_handler) = SAMDHost::new(
dp.USB,
pins.usb_sof,
pins.usb_dm,
pins.usb_dp,
Some(pins.usb_host_enable),
&mut pins.port,
&mut clocks,
&mut dp.PM,
&rtc::millis,
);
let mut bootkbd = BootKeyboard::new(|addr, buf| {
info!("{}: {:?}", addr, buf);
let hdr: [u8; 2] = [I2CMessageType::Keyboard as u8, buf.len() as u8];
i2c_master.write(NRF_WIREADDR, &hdr).ok();
i2c_master.write(NRF_WIREADDR, &buf).ok();
});
let mut drivers: [&mut dyn Driver; 1] = [&mut bootkbd];
HANDLERS.with_overrides(|hs| {
hs.register(0, &mut rtc_handler);
unsafe { cp.NVIC.set_priority(Interrupt::USB, 0) };
cp.NVIC.enable(Interrupt::RTC);
hs.register(1, &mut usb_handler);
unsafe { cp.NVIC.set_priority(Interrupt::USB, 1) };
cp.NVIC.enable(Interrupt::USB);
info!("Bootstrap complete.");
loop {
usb_host.task(&mut drivers[..]);
wfi()
}
});
unreachable!();
}
#[allow(unused)]
#[repr(u8)]
enum I2CMessageType {
Debug = 0x00,
Keyboard = 0x01,
Invalid = 0xff,
}
#[panic_handler]
fn panic_handler(pi: &PanicInfo) -> ! {
let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { mem::transmute(LED) };
red_led.set_high().ok();
logln_now!("~~~ PANIC ~~~");
logln_now!("{}", pi);
logln_now!("flushing log");
loop {
log::logger().flush();
wfi()
}
}
#[exception]
fn HardFault(ef: &ExceptionFrame) -> ! {
let red_led: &mut Pa10<Output<OpenDrain>> = unsafe { mem::transmute(LED) };
red_led.set_high().ok();
log::logger().flush();
logln_now!("!!! Hard Fault - ef: {:?} !!!", ef);
logln_now!("flushing log");
loop {
log::logger().flush();
wfi()
}
}
#[interrupt]
fn RTC() {
HANDLERS.call(0);
}
#[interrupt]
fn USB() {
HANDLERS.call(1);
}
|
