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#![no_std]
#![no_main]
use embassy_executor::Spawner;
use embassy_mcxa276 as hal;
use hal::interrupt::typelevel::Handler;
use hal::uart;
mod common;
use embassy_mcxa276::bind_interrupts;
use {defmt_rtt as _, panic_probe as _};
// Bind LPUART2 interrupt to our handler
bind_interrupts!(struct Irqs {
LPUART2 => hal::uart::UartInterruptHandler;
});
#[used]
#[no_mangle]
static KEEP_LPUART2: unsafe extern "C" fn() = LPUART2;
// Wrapper function for the interrupt handler
unsafe extern "C" fn lpuart2_handler() {
hal::uart::UartInterruptHandler::on_interrupt();
}
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let _p = hal::init(hal::config::Config::default());
// Enable/clock UART2 before touching its registers
unsafe {
common::init_uart2(hal::pac());
}
let src = unsafe { hal::clocks::uart2_src_hz(hal::pac()) };
let uart = uart::Uart::<uart::Lpuart2>::new(_p.LPUART2, uart::Config::new(src));
// Configure LPUART2 interrupt for UART operation BEFORE any UART usage
hal::interrupt::LPUART2.configure_for_uart(hal::interrupt::Priority::from(3));
// Manually install the interrupt handler and enable RX IRQs in the peripheral
unsafe {
hal::interrupt::LPUART2.install_handler(lpuart2_handler);
// Enable RX interrupts so the handler actually fires on incoming bytes
uart.enable_rx_interrupts();
}
// Print welcome message
uart.write_str_blocking("UART interrupt echo demo starting...\r\n");
uart.write_str_blocking("Type characters to echo them back.\r\n");
// Log using defmt if enabled
defmt::info!("UART interrupt echo demo starting...");
loop {
// Check if we have received any data
if uart.rx_data_available() {
if let Some(byte) = uart.try_read_byte() {
// Echo it back
uart.write_byte(byte);
uart.write_str_blocking(" (received)\r\n");
}
} else {
// No data available, wait a bit before checking again
cortex_m::asm::delay(12_000_000); // ~1 second at 12MHz
}
}
}
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