/**
  ******************************************************************************
  * 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.
  *******************************************************************************
  */

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Version history:
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2025-8-26	V1.0.0	AE TEAM

<--------------------------------------------------------------------------------
Demo introduction:
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本示例功能：
(1).通过外部8M晶振校准HRC

<--------------------------------------------------------------------------------
测试环境:
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测试用板；
ES-PDS-ES8H0464ELLT(需外接8M晶振)

辅助工具：
多功能接口转换工具ESBridge
示波器

辅助软件：
ESBridge上位机软件

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测试步骤：
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(1) 编译工程，编译通过后将程序下载到目标芯片。
(2) 将程序配置成时钟输出模式，初始化时钟输出引脚。
(3) ESBridge通过USB线缆连接PC，打开上位机软件，“设备操作”选项里选择“打开”。
(4) 将时钟输出引脚接到示波器观察频率。
(5) 使用热风枪或者高低温箱改变板载晶振温度。
(6) 打开串口，等待接收Log日志。

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System clock:
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Internal HRC 48MHz

<--------------------------------------------------------------------------------
Pin connection: 
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UART_TX_PIN  ----  PB25[GPIO_FUNC_2]
CLOCK_0_OUT_PIN  ----  PB0[GPIO_FUNC_1]
CLOCK_1_OUT_PIN  ----  PB1[GPIO_FUNC_1]
HOSC_OUT_PIN  ----  PB0[MD_GPIO_FUNC_ANALOG]
HOSC_IN_PIN  ----  PB1[MD_GPIO_FUNC_ANALOG]
TEST_IO_1_PIN  ----  PB0[MD_GPIO_FUNC_0]
TEST_IO_2_PIN  ----  PB1[MD_GPIO_FUNC_0]
