From 028458d80bd71ad37a6c4e5406c46e77688b28ba Mon Sep 17 00:00:00 2001
From: Andy Killorin <andy@ank.dev>
Date: Fri, 11 Jul 2025 23:39:21 -0500
Subject: [PATCH] serial recv arch

---
 src/main.rs | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 9797ab8..0eac177 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,15 @@
 #![no_std]
 #![no_main]
+#![feature(abi_avr_interrupt)]
 
+use core::mem::MaybeUninit;
+
+use arduino_hal::clock::MHz16;
 use arduino_hal::hal::port::*;
+use arduino_hal::hal::usart::UsartReader;
+use arduino_hal::pac::USART0;
 use arduino_hal::port::mode::*;
-use embedded_hal::digital::OutputPin;
+use arduino_hal::prelude::*;
 use panic_halt as _;
 
 fn shift_out(data_pin: &mut Pin<Output, PB0>, clock_pin: &mut Pin<Output, PD4>, data: &u8) {
@@ -34,6 +40,16 @@ fn update_shift_register(
     latch_pin.set_high();
 }
 
+static mut UART_RX: MaybeUninit<UsartReader<USART0, Pin<Input, PD0>, Pin<Output, PD1>, MHz16>> = MaybeUninit::uninit();
+
+#[avr_device::interrupt(atmega328p)]
+fn USART_RX() {
+    let rx = unsafe{ &mut *UART_RX.as_mut_ptr() };
+
+    rx.read();
+}
+
+
 #[arduino_hal::entry]
 fn main() -> ! {
     let dp = arduino_hal::Peripherals::take().unwrap();
@@ -65,6 +81,18 @@ fn main() -> ! {
 
     let mut led = pins.d13.into_output();
 
+    let mut serial = arduino_hal::default_serial!(dp, pins, 115200);
+
+    avr_device::interrupt::disable();
+    serial.listen(arduino_hal::hal::usart::Event::RxComplete);
+
+    let (rx,tx) = serial.split();
+
+    unsafe { 
+        UART_RX = MaybeUninit::new(rx);
+        avr_device::interrupt::enable();
+    };
+
     loop {
         let mut shift_register = 0;
         const LEFT_FWD: u8 = 1 << 5; // 1a