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Version history:
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2021-09-25	V1.00	AE TEAM
2022-07-17	V1.01	AE TEAM
1.适配ES-PDS-ES32F3696LX开发板

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Demo introduction:
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本示例功能：LIN通信，中断方式收发数据，ES32F3696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-ES32F3696LX-V1.0

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RX/TX引脚, T151的SLP管脚连接至VDD或PB7，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) 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：55 66 77 88 11 22 33 44），并勾掉使能；
6) 在线调试，并将node1加入watch窗口（iar为live watch），运行程序，；
7）当上位机收到MCU发送过来的数据后，立刻勾选使能，使USB转LIN调试器可以进行应答，等待几秒后，可以看到上位机中提示“从发送成功”，此时查看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) 测试用板与辅助工具之间需要共地

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System clock:
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External HOSC[12MHz] divided by 3, then PLL to 72MHz.

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Pin connection: 
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LIN1_TX  ---- PB10[GPIO_FUNC_3]
LIN1_RX  ---- PB11[GPIO_FUNC_3]
LIN1_INH ---- PB6[GPIO_FUNC_1]
LIN1_SLP ---- PB7[GPIO_FUNC_1]
