/**
  ******************************************************************************
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Copyright (C) 2021 Shanghai Eastsoft Microelectronics Co., Ltd. ALL rights reserved.
  *******************************************************************************
  */

<--------------------------------------------------------------------------------
Version history:
--------------------------------------------------------------------------------->
2021-3-16	V1.0.0	AE TEAM

<--------------------------------------------------------------------------------
Demo introduction:
--------------------------------------------------------------------------------->
本示例功能：利用红外调制信号，实现UART无线通信。

<--------------------------------------------------------------------------------
测试环境:
--------------------------------------------------------------------------------->
测试用板；
ES-DEV-ES32W3120

辅助工具：
红外串口调试板Kingst USB-IR v1.0

辅助软件：
串口调试助手上位机XCOM V2.0

<--------------------------------------------------------------------------------
测试步骤：
--------------------------------------------------------------------------------->
1) 编译工程，编译通过后将程序下载到目标芯片；
2) 将芯片的TX/RX引脚分别接HRSDK-GMB-01测试板的RM_T/RM_R，USB-IR接PC的USB口；
3) 将HRSDK-GMB-01测试板上红外对管RMT/RMR分别对准USB-IR的RMR/RMT；
4) 打开XCOM上位机，选择正确串口（USB-SERIAL），按照程序设置UART参数，点击“打开串口”；
5) 在线调试，将g_rx_buf添加到监视窗，运行程序，上位机接收到芯片发来地字符串并打印在接收框；
6) 在上位机发送框输入字符串，点击“发送”，g_rx_buf接收到字符串。

<--------------------------------------------------------------------------------
注意：
--------------------------------------------------------------------------------->
ES-DEV-ES32W3120
2) 波特率设置勿超过2400bps；
3) 同一组红外对管应互相错开，避免自发自收。

<--------------------------------------------------------------------------------
System clock:
--------------------------------------------------------------------------------->
External HOSC[32MHz] divided by 32, then PLL to 48Mhz.

<--------------------------------------------------------------------------------
Pin connection: 
--------------------------------------------------------------------------------->
UART0_TX ---- PA2[GPIO_FUNC_2]
UART0_RX ---- PA3[GPIO_FUNC_2]
