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================================================================================
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样例使用说明
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Sample Description
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================================================================================
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功能描述:
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此样例是利用中断对串口外设接口（SPI）与外部设备以全双工串行方式进行通信的演示，
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主设备提供通信时钟SCK，通过MOSI/MISO引脚发送/接收数据。从设备通过MOSI/MISO引脚接
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收/发送数据。数据以主机提供的SCK沿同步被移位，完成全双工通信。
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Function descriptions:
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This sample is a demonstration of using interrupts to communicate with a serial
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peripheral interface (SPI) and an external device in full-duplex serial mode.
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The master device provides the communication clock SCK and sends/receives data
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through the MOSI/MISO pin. The slave device receives/transmits data through the
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MOSI/MISO pins. The data is shifted synchronously along the SCK provided by the
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master to complete full-duplex communication.
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================================================================================
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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SPI_TwoBoards_FullDuplexMaster_IT
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3.编译下载从机程序SPI_TwoBoards_FullDuplexSlave_IT
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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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SCK(PB3) -----> sck(PB3)
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MISO(PB4) <----- MISO(PB4)
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MOSI(PB5) -----> MOSI(PB5)
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NSS(PA15) -----> NSS(PA15)
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5.主从机上电
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6.按下从机复位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 host and the other as the slave
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2. Compile and download the host program: SPI_TwoBoards_FullDuplexMaster_IT
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3. Compile and download slave program: SPI_TwoBoards_FullDuplexSlave_IT
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4. The host is connected to the SLAVE pin (the arrow points in the signal
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transmission direction).
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MASTER： SLAVE：
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SCK(PB3) -----> sck(PB3)
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MISO(PB4) <----- MISO(PB4)
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MOSI(PB5) -----> MOSI(PB5)
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NSS(PA15) -----> NSS(PA15)
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5. Power on the host and slave
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6. Press the slave reset button to run the slave program first, and then press
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the host user button to run the host program
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7. Observe the LED lights of the master and slave. When the LED lights of the
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master and slave turn from normal dark to steady on, it indicates that the
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master and slave receive and send data successfully; When the LED of the host or
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slave is blinking, it indicates that the host or slave fails to receive and send
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data.
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================================================================================
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注意事项:
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1.必须先按从机复位按键使从机程序先运行，再按主机用户按键开始运行主机程序，否则会
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导致主从机通信失败。
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2.主机模式可通过程序设置IO控制方式为DMA方式、中断方式和查询方式
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3.NSS引脚只需要在使用NSS硬件方式时连接（本样例使用的是NSS硬件方式）
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Note:
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1. You must press the slave reset button to make the slave program run first,
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and then press the host user button to start running the host program,
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otherwise, the communication between the host and slave will be fail
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2. The host mode can be programmed to set the IO control mode to DMA mode,
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interrupt mode and query mode
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3.NSS pins need to be connected only when using NSS hardware mode (this example
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uses NSS hardware mode).
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================================================================================
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