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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了I2C通过DMA方式进行通讯，主机先向从机发送15byte数据，然后再接收从机
发送的15byte数据，主机和从机接收数据成功后，主机和从机板上的小灯处于“常亮”状态。

Function descriptions:
This sample demonstrates I2C communication using DMA. The master device first 
sends 15 bytes of data to the slave device, and then receives 15 bytes of data 
from the slave. When both the master and slave successfully receive the data, 
the LEDs on the master and slave boards are continuously on.
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测试环境：
测试用板：PY32F040E_STK
MDK版本： 5.28
IAR版本： 9.20
GCC 版本：GNU Arm Embedded Toolchain 10.3-2021.10

Test environment:
Test board: PY32F040E_STK
MDK Version: 5.28
IAR Version: 9.20
GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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使用步骤：
1. 编译下载程序到MCU，并运行。
2. 先复位从机，然后再复位主机。
3. 复位完成后，按下主机的用户按键，主从机开始通信。
4. 观察主机和从机的LED灯，当主机和从机的LED灯由常暗状态转为常亮状态时，表示主机
和从机成功收发数据。如果主机或从机的LED灯处于闪烁状态，则表示主机和从机的数据收
发失败。

Example execution steps:
1. Compile and download the program to the MCU, and run it.
2. Reset the slave device first, and then reset the master device.
3. After the reset, press the user button on the master device to start the 
communication between the master and slave.
4. Observe the LEDs on the master and slave boards. When the LEDs on both the 
master and slave change from off to on, it indicates that the data transmission 
between the master and slave was successful. If the LED on either the master or 
slave is blinking, it indicates a data transmission failure.
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注意事项：
PA9     ------> I2C_SCL
PA10    ------> I2C_SDA 
主机程序为I2C_TwoBoard_CommunicationMaster_DMA_Init
从机程序为I2C_TwoBoard_CommunicationSlave_DMA_Init
如需修改速率，直接修改I2C_SPEEDCLOCK即可。

Notes:
PA9     ------> I2C_SCL
PA10    ------> I2C_SDA 
Master program: I2C_TwoBoard_CommunicationMaster_DMA_Init
Slave program: I2C_TwoBoard_CommunicationSlave_DMA_Init
To modify the speed, directly modify I2C_SPEEDCLOCK.
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