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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SPI从机中断方式收发数据功能，主机发起读数据流程，从机发送spi_tx_buf里面的
数据，主机发起写数据流程，从机接收数据。

Function descriptions:
This sample demonstrates the function of sending and receiving data in the SPI 
slave interrupt mode. When the master initiates the data reading process, the 
slave sends the data in the spi_tx_buf. When the master initiates the data 
writing process, the slave receives the data.
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测试环境：
测试用板：DPM32M030_REV_A
MDK版本： 5.28

Test environment:
Test board: DPM32M030_REV_A
MDK Version: 5.28
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使用步骤：
1. 编译下载程序到MCU，并运行。

Example execution steps:
1. Compile and download the program to MCU, and run it.

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注意事项：
SPI引脚如下：
SPI0_NSS   -> PA15
SPI0_CLK   -> PB3
SPI0_MSIO  -> PB4
SPI0_MOSI  -> PB5

Notes:
The SPI pins are as follows:
SPI0_NSS   -> PA15
SPI0_CLK   -> PB3
SPI0_MSIO  -> PB4
SPI0_MOSI  -> PB5
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