能不能在RT-Thread框架内实现SPI从机模式呢？

官方提供的spi相关文档都是做主机，能不能在RT-Thread框架内实现SPI从机模式呢？

这样配置有没有什么问题？

// 3、针对设备进行配置
{
    struct rt_spi_configuration cfg;
    cfg.data_width = 8;
    cfg.mode = RT_SPI_SLAVE | RT_SPI_MODE_0 | RT_SPI_MSB;
    cfg.max_hz =
        20 * 1000 * 1000; /* 20M,SPI max 42MHz,ssd1351 4-wire spi */
    rt_spi_configure(spi_dev_usb, &cfg);
}

操作该如何触发接收函数？

uint8_t num = 0;
    num = rt_spi_recv(spi_dev_usb, buf_recv, 5);
    if (num) {
        rt_kprintf("num = %d<br>", num);
        for (size_t i = 0; i < num; i++)
        {
            rt_kprintf(" %02X ", buf_recv*);
            buf_send* = buf_recv* ^ 0xff;
        }
            rt_kprintf("<br>");
        rt_spi_send(spi_dev_usb, buf_send, num);
    }
    rt_thread_mdelay(50);