at client 接收数据丢数

        pconfig.baud_rate = BAUD_RATE_9600;
        pconfig.data_bits = DATA_BITS_8;
        pconfig.stop_bits = STOP_BITS_1;
        pconfig.parity    = PARITY_NONE;
        pconfig.bit_order = BIT_ORDER_LSB;
        pconfig.invert    = NRZ_NORMAL;
        pconfig.bufsz     = RT_SERIAL_RB_BUFSZ;
        pconfig.reserved  = 0;
        /* 设置串口参数 */
        rt_device_control(SerialDev.dev, RT_DEVICE_CTRL_CONFIG, &pconfig);

                struct serial_configure *pconfig = (struct serial_configure *) args;
                if (pconfig->bufsz != serial->config.bufsz && serial->parent.ref_count)
                {
                    /*can not change buffer size*/
                    return RT_EBUSY;
                }

int rt_hw_usart_init(void)
{
    rt_size_t obj_num = sizeof(uart_obj) / sizeof(struct stm32_uart);
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
    rt_err_t result = 0;
    stm32_uart_get_dma_config();
    for (int i = 0; i < obj_num; i++)
    {
        /* init UART object */
        uart_obj[i].config = &uart_config[i];
        uart_obj[i].serial.ops    = &stm32_uart_ops;
        uart_obj[i].serial.config = config;
        // 特殊修改串口2的缓存大小
        if (rt_strcmp(uart_obj[i].config->name, "uart2") == 0)
            uart_obj[i].serial.config.bufsz = 1024;
        /* register UART device */
        result = rt_hw_serial_register(&uart_obj[i].serial, uart_obj[i].config->name,
                                       RT_DEVICE_FLAG_RDWR
                                       | RT_DEVICE_FLAG_INT_RX
                                       | RT_DEVICE_FLAG_INT_TX
                                       | uart_obj[i].uart_dma_flag
                                       , NULL);
        RT_ASSERT(result == RT_EOK);
    }
    return result;
}