/**
  ******************************************************************************
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  * Copyright (C) 2023 Shanghai Eastsoft Microelectronics Co., Ltd. ALL rights reserved.
  *******************************************************************************
  */

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Version history:
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2023-1-4	V1.0.0	AE TEAM

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Demo introduction:
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本示例功能：SPI从机收发，中断方式。

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测试环境:
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测试用板；
ES-PDS-ES32VF2264

辅助工具：
多功能接口转换工具ES-Bridge

辅助软件：
ES-Bridge上位机软件

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测试步骤：
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1) 编译工程，编译通过后将程序下载到目标芯片；
2) 将程序配置的NSS/SCK/MISO/MOSI对应的引脚分别连接ES-DAPLink(ES-Bridge)的NSS/SCK/MISO/MOSI；
3) ES-DAPLink(ES-Bridge)通过USB线缆连接PC，打开上位机软件，“设备操作”选项里选择“打开”；
4) 上位机切换到SPI标签页，按照程序配置参数（主机模式-第二边沿采样-时钟极性：空闲高电平-片选极性：低电平-高位在前-频率：328KHz），点击打开；
5) 在线调试，将g_recv_buf加入监视窗，运行程序；
6) 在写数据对话框输入20字节HEX数据，读字节数设置为20；
7) 点击“写数据”，芯片接收到上位机发来的数据，并存入g_recv_buf；
8) 点击“读数据”，芯片将g_recv_buf里的数据返回，上位机接收到芯片发来的数据并打印。

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注意：
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1) 测试板与ES-Bridge需共GND。

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System clock:
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PLL 48MHz

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Pin connection: 
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SPI0_NSS ----- PA4
SPI0_SCK ----- PA5
SPI0_MISO ---- PA6
SPI0_MOSI ---- PA7
