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我正在实现 SPI 驱动程序。

现在我有以下驱动程序代码（MRE 化）：

use tokio::{join, sync::mpsc};

async fn spi_transmit(write_buf: &[u32], read_buf: &mut [u32]) {
    assert_eq!(read_buf.len(), write_buf.len());
    let (write_fifo, mut read_fifo) = mpsc::channel(2);

    let write_task = async {
        // Simulate an SPI bus that respondes with the sent data + 20,
        // just for demo purposes
        for val in write_buf {
            write_fifo.send(*val + 20).await.unwrap();
        }
    };

    let read_task = async {
        for val in read_buf {
            *val = read_fifo.recv().await.unwrap();
        }
    };

    join!(write_task, read_task);
}

#[tokio::main]
async fn main() { …