STM32H7使用Serial V2框架配合DMA，可以修改DMA的buffer内存位置吗

发布于 2024-12-09 12:54:58 浏览：297 订阅该版

3 个回答

KunYi 2024-12-10

这家伙很懒，什么也没写！

tjrong 2024-12-11

这家伙很懒，什么也没写！

宝宝A 2025-02-17

这家伙很懒，什么也没写！

参考实现
```c++
__attribute__((section(".ram_d2"))) uint8_t gps_rx_fifo[sizeof(struct rt_serial_rx_fifo) + BSP_UART3_RX_BUFSIZE];

auto dev = rt_device_find("uart3");
    if (!dev) {
        log_w("uart3 not found");
        return;
    }
    auto serial_dev = reinterpret_cast<rt_serial_device *>(dev);
    rt_device_open(dev, RT_DEVICE_FLAG_RX_NON_BLOCKING | RT_DEVICE_FLAG_TX_BLOCKING);

// replace fifo path as that cannot be dma
    dev->open_flag &= ~RT_SERIAL_RX_NON_BLOCKING;
    serial_dev->ops->control(serial_dev,
                             RT_DEVICE_CTRL_CLR_INT,
                             (void *) RT_SERIAL_RX_NON_BLOCKING);

struct stm32_uart *uart = rt_container_of(serial_dev, struct stm32_uart, serial);
    HAL_UART_DMAStop(&(uart->handle));

auto rx_fifo = (struct rt_serial_rx_fifo *) serial_dev->serial_rx;
    RT_ASSERT(rx_fifo != RT_NULL);
    rt_free(rx_fifo);

rx_fifo = (struct rt_serial_rx_fifo *) gps_rx_fifo;
    rt_ringbuffer_init(&(rx_fifo->rb), rx_fifo->buffer, serial_dev->config.rx_bufsz);

serial_dev->serial_rx = rx_fifo;

dev->open_flag |= RT_SERIAL_RX_NON_BLOCKING;
    serial_dev->ops->control(serial_dev,
                             RT_DEVICE_CTRL_CONFIG,
                             (void *) RT_SERIAL_RX_NON_BLOCKING);
```