From 9ff9f51c07f7226d6467bc9db608cc53c82365bd Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Tue, 6 Aug 2019 08:53:42 -0400
Subject: Initial commit.

---
 src/main.rs | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100755 src/main.rs

(limited to 'src/main.rs')

diff --git a/src/main.rs b/src/main.rs
new file mode 100755
index 0000000..071966a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,144 @@
+#![no_std]
+#![no_main]
+
+mod dotstar;
+mod logger;
+mod macros;
+mod rtc;
+
+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::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,
+};
+
+// I²C on trinket is on SERCOM2
+
+static mut LED: usize = 0;
+
+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 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);
+
+    HANDLERS.with_overrides(|hs| {
+        hs.register(0, &mut rtc_handler);
+        cp.NVIC.enable(Interrupt::RTC);
+
+        info!("Bootstrap complete.");
+
+        loop {
+            wfi()
+        }
+    });
+    unreachable!();
+}
+
+#[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);
+}
-- 
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