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//! LPUART DMA example for MCXA276.
//!
//! This example demonstrates using DMA for UART TX and RX operations.
//! It sends a message using DMA, then waits for 16 characters to be received
//! via DMA and echoes them back.
//!
//! The DMA request sources are automatically derived from the LPUART instance type.
//! DMA clock/reset/init is handled automatically by the HAL.
#![no_std]
#![no_main]
use embassy_executor::Spawner;
use embassy_mcxa::clocks::config::Div8;
use embassy_mcxa::lpuart::{Config, LpuartDma};
use {defmt_rtt as _, embassy_mcxa as hal, panic_probe as _};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let mut cfg = hal::config::Config::default();
cfg.clock_cfg.sirc.fro_12m_enabled = true;
cfg.clock_cfg.sirc.fro_lf_div = Some(Div8::no_div());
let p = hal::init(cfg);
defmt::info!("LPUART DMA example starting...");
// Create UART configuration
let config = Config {
baudrate_bps: 115_200,
..Default::default()
};
// Create UART instance with DMA channels
let mut lpuart = LpuartDma::new(
p.LPUART2, // Instance
p.P2_2, // TX pin
p.P2_3, // RX pin
p.DMA_CH0, // TX DMA channel
p.DMA_CH1, // RX DMA channel
config,
)
.unwrap();
// Send a message using DMA (DMA request source is automatically derived from LPUART2)
let tx_msg = b"Hello from LPUART2 DMA TX!\r\n";
lpuart.write_dma(tx_msg).await.unwrap();
defmt::info!("TX DMA complete");
// Send prompt
let prompt = b"Type 16 characters to echo via DMA:\r\n";
lpuart.write_dma(prompt).await.unwrap();
// Receive 16 characters using DMA
let mut rx_buf = [0u8; 16];
lpuart.read_dma(&mut rx_buf).await.unwrap();
defmt::info!("RX DMA complete");
// Echo back the received data
let echo_prefix = b"\r\nReceived: ";
lpuart.write_dma(echo_prefix).await.unwrap();
lpuart.write_dma(&rx_buf).await.unwrap();
let done_msg = b"\r\nDone!\r\n";
lpuart.write_dma(done_msg).await.unwrap();
defmt::info!("Example complete");
}
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