/**
  ******************************************************************************
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  * Copyright (C) 2023 Shanghai Eastsoft Microelectronics Co., Ltd. ALL rights reserved.
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  */

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Version history:
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2023-1-5	V1.0.0	AE TEAM

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Demo introduction:
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本示例功能：LIN通信demo，MCU作为LIN的主节点，先发送数据再读取数据。
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测试环境:
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测试用板；
ES-PDS-ES32VF2264

辅助工具：
LIN transceiver模块T151
USB转LIN调试器

辅助软件：
USB_LIN-V1.6.0

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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) 将程序配置的TX/RX引脚连接到T151的TX/RX引脚, T151的SLP管脚连接至VDD或PA7，然后连接LIN transceiver模块T151与USB转LIN调试器；
3) USB转LIN调试器通过USB口连接PC，打开上位机软件USB_LIN-V1.6.0，点击“刷新通信口”后，选择对应的设备，然后点击“打开通信口”建立连接；
4) 使用上位机配置设备模式及波特率等参数（设备模式-从机，波特率9600，心跳包时间-1000），打开通信口建立连接；
5) 点击上位机的“高级发送窗口”，确保没有进入循环发送模式，点击“从机写配置”，确保没有发送使能被勾选；
6) 将PA2接地后移除，MCU将发送数据"88 77 66 55 44 33 22 11"，上位机将在下方数据栏内显示接收到的数据；
7）USB_LIN-V1.6.0切换到“从机写配置”页面，配置参数（ID：0x07，校验：增强，数据：11 22 33 44 55 66 77 88），并勾选使能；
8）将PA3接地后移除，MCU发起读操作接收，接收T151模块发送来的数据，当看到上位机中提示“从发送成功”后，可查看node1中trans_buf中的数据是否与USB转LIN调试器发送的数据内容一致。

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注意：
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1) LIN1_SLP可直接接到VDD
2) 例程中未使用INH，因此LIN1_INH可保持悬空

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System clock:
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HRC 48MHz

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Pin connection: 
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LIN1_TX  ---- PC14[GPIO_FUNC_2]
LIN1_RX  ---- PC4 [GPIO_FUNC_2]
LIN1_INH ---- PA6 [GPIO_FUNC_1]
LIN1_SLP ---- PA7 [GPIO_FUNC_1]
