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样例使用说明
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Sample Description
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功能描述:
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此样例是对I2S主机与I2S从机以polling方式进行通信的演示，I2S主机先向I2S从机发送数
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据0x1~0x10，I2S从机接收到数据后，再向I2S主机回发数据0x1~0x10，当I2S主机、I2S
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从机成功接收数据时，小灯处于常亮状态，否则小灯处于闪烁状态。
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Function descriptions:
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This sample demonstrates communication between the I2S master and I2S slave
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using polling. The I2S master sends data 0x1 to 0x10 to the I2S slave. The I2S
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slave receives the data and sends back data 0x1 to 0x10 to the I2S master. When
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both the I2S master and I2S slave successfully receive the data, the LED will be
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constantly on. Otherwise, the LED will be blinking.
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测试环境：
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测试用板：PY32F403_STK
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MDK版本： 5.28
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IAR版本： 9.20
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GCC版本：GNU Arm Embedded Toolchain 10.3-2021.10
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Test environment:
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Test board: PY32F403_STK
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MDK Version: 5.28
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IAR Version: 9.20
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GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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================================================================================
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使用步骤:
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1.选择两块PY32F403_STK板，一块作为主机，一块作为从机
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2.编译下载主机程序I2S_TwoBoard_CommunicationMaster_Polling
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3.编译下载从机程序I2S_TwoBoard_CommunicationSlave_Polling
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4.主机与从机引脚连接(箭头指向为信号传输方向)
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主机MASTER： 从机SLAVE：
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SD(PB15) <-----> SD(PB15)
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WS(PB12) -----> WS(PB12)
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CK(PB13) -----> CK(PB13)
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GND <-----> GND
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5.主、从机上电后，并按下主、从机复位按键
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6.按下从机用户按键先运行从机程序，再按下主机用户按键运行主机程序
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7.观察主从机的LED灯，当主机和从机LED灯由常暗转为常亮状态，则表明主机、从机收发数
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据成功；当主机或从机LED灯处于闪烁状态，则表明主机、从机收发数据失败。
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Example execution steps:
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1. Select two PY32F403_STK boards, one as the master and one as the slave.
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2. Compile and download the master program I2S_TwoBoard_CommunicationMaster_Polling.
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3. Compile and download the slave program I2S_TwoBoard_CommunicationSlave_Polling.
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4. Connect the pins of the master and slave boards (direction indicated by the
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arrow):
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Master MASTER: Slave SLAVE:
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SD(PB15) <-----> SD(PB15)
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WS(PB12) -----> WS(PB12)
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CK(PB13) -----> CK(PB13)
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GND <-----> GND
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5. Power on the master and slave boards, and press the reset buttons on both.
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6. Press the user button on the slave to run the slave program first, then press
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the user button on the master to run the master program.
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7. Observe the LEDs on the master and slave boards. When the LEDs on both the
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master and slave boards change from dim to constantly on, it indicates that
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the master and slave have successfully transmitted and received data. If the
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LEDs on the master or slave are blinking, it indicates a failure in data
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transmission.
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================================================================================
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注意事项:
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Notes:
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================================================================================
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