63 lines
1.9 KiB
Rust
63 lines
1.9 KiB
Rust
// src/bin/main.rs
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#![no_std]
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#![no_main]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_stm32::gpio::{Input, Output, Level, Pull, Speed};
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use embassy_time::{Duration, Timer};
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use dma_gpio::software_uart::{
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dma_timer::{init_tim6_for_uart, init_tim7_for_uart},
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gpio_dma_uart_tx::{write_uart_frames_to_pipe, UartConfig, Parity, StopBits},
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runtime::{rx_dma_task, tx_dma_task},
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debug::dump_tim6_regs,
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};
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use {defmt_rtt as _, panic_probe as _};
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/// SOFTWARE UART CONFIGURATION
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const BAUD: u32 = 115_200;
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const TX_PIN_BIT: u8 = 2; // PA2
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const TX_OVERSAMPLE: u16 = 1;
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const RX_OVERSAMPLE: u16 = 16;
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const PIPE_TX_SIZE: usize = 256;
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const PIPE_RX_SIZE: usize = 256;
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const RX_RING_BYTES: usize = 4096;
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static PIPE_TX: Pipe<CriticalSectionRawMutex, PIPE_TX_SIZE> = Pipe::new();
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static PIPE_RX: Pipe<CriticalSectionRawMutex, PIPE_RX_SIZE> = Pipe::new();
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// Large hardware RX DMA circular buffer, scales with oversampling rate
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static mut RX_RING: [u8; RX_RING_BYTES] = [0; RX_RING_BYTES];
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#[embassy_executor::main]
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async fn main(spawner: Spawner) {
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// Initialize peripheral access
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let mut p = embassy_stm32::init(Default::default());
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info!("UART DMA demo starting...");
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// GPIO setup
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let rx = Input::new(p.PA3, Pull::Up);
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let _tx = Output::new(p.PA2, Level::High, Speed::VeryHigh);
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// Timer setup
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init_tim6_for_uart(p.TIM6, BAUD, TX_OVERSAMPLE);
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init_tim7_for_uart(p.TIM7, BAUD, RX_OVERSAMPLE);
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dump_tim6_regs(); // debug
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// Spawn DMA tasks
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spawner.spawn(tx_dma_task(p.GPDMA1_CH0)).unwrap();
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spawner.spawn(rx_dma_task(p.GPDMA1_CH1)).unwrap();
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// UART config (8N1 default)
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let uart_cfg = UartConfig {
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data_bits: 8,
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parity: Parity::None,
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stop_bits: StopBits::One,
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};
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// Main loop: send data periodically
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loop {
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write_uart_frames_to_pipe(&PIPE_TX, TX_PIN_BIT, b"Hello marshmallow\r\n", &uart_cfg).await;
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Timer::after(Duration::from_secs(2)).await;
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}
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}
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