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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从机阻塞收发数据功能，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 blocking data transmission and reception functions of 
the SPI slave. 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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