目前在AD9361的裸机中肯定少不了硬件(FPGA)跟软件(C语言)的协同，所以我们在后续的章节中会分别从软硬件的角度来分析AD9361的裸机程序，另外，我们之前介绍过FPGA的硬件开发大概的流程(vivado)以及软件的开发流程(vitis)，所以我们在后面就不那么详细的对工具做手把手介绍了，有疑问的可以参照下前面的文章来复习下

整个AD9361的裸机验证连接如下：https://wlink.blog.csdn.net/article/details/151620972?spm=1001.2014.3001.5502

本文也是针对这个工程来做拆解分析，主要内容是ad9361 no-os裸机程序的串口实验，这块是整个打印的基础，没有这块的配置，你是无法实时debug你写的代码是否正确，本文的实验目的也是可以能够打印出来log.

一. 硬件设计

在看配置前，我们首先来看下原理图，这样才能清楚对应的关系，开发板子上的是通过一个USB转串口来打印log，芯片是用的CP2102，也是比较常见的usb转串口，原理图如下：

通过原理图我们可以看到uart是挂在BANK500上的MIO12/13上，也就是PS核上的，不同为啥在PS核可以参照我这篇文章：https://wlink.blog.csdn.net/article/details/151676741?spm=1001.2014.3001.5502

我们我们对应的vivado的配置如下：

有了这块，其实就可以了，其他的外设我们先不管，当然你也可以自己写一个程序来验证下，我自己也做过实验了，所以这块就省略了。

二. 软件设计

这块我觉得你也可以自己写一个vivado来做下，具体方法可以参照我这篇文章中的软件部分

https://wlink.blog.csdn.net/article/details/151185631

整个代码如下，非常简单哈

/******************************************************************************
*
* Copyright (C) 2009 - 2014 Xilinx, Inc.  All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* Use of the Software is limited solely to applications:
* (a) running on a Xilinx device, or
* (b) that interact with a Xilinx device through a bus or interconnect.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of the Xilinx shall not be used
* in advertising or otherwise to promote the sale, use or other dealings in
* this Software without prior written authorization from Xilinx.
*
******************************************************************************/

/*
 * helloworld.c: simple test application
 *
 * This application configures UART 16550 to baud rate 9600.
 * PS7 UART (Zynq) is not initialized by this application, since
 * bootrom/bsp configures it to baud rate 115200
 *
 * ------------------------------------------------
 * | UART TYPE   BAUD RATE                        |
 * ------------------------------------------------
 *   uartns550   9600
 *   uartlite    Configurable only in HW design
 *   ps7_uart    115200 (configured by bootrom/bsp)
 */

#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"


int main()
{
    print("Hello World\n\r");
    print("Successfully ran Hello World application");

    return 0;
}

就是一个打印，效果如下：

当然有一个配置，你们可能要注意下

也就是这里stdin,stdout，其实就是重定向而已，不过我们暂时也只是用到了print打印，而不是C语言标准库中的printf打印，这点需要注意一下