/**
  ******************************************************************************
  * 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
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * 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.
  *
  * Copyright (C) 2021 Shanghai Eastsoft Microelectronics Co., Ltd. ALL rights reserved.
  *******************************************************************************
  */

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Version history:
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2021-3-16       V1.0.0      AE TEAM

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Demo introduction:
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本示例功能：SPI主机方式与flash芯片通信，读写数据，通过USART打印读写结果。

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测试环境:
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测试用板；
ES-PDS-ES32H040xLQ-V1.0，ES-PDS-E2+FLASH-V1.1

辅助工具：


辅助软件：
串口调试助手

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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) 将芯片的NSS/SCK/MISO/MOSI分别连接flash的CS/SCK/MISO/MOSI
3) 打开串口调试助手，按照程序配置参数（波特率115200-1位停止位-8位数据位-无奇偶校验），打开串口；
4) 复位芯片，或在线调试，运行程序，串口调试助手接收框打印读写结果。

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注意：
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1) keil工程请勿勾选“GNU extensions”;
1) ES-PDS-E2+FLASH需要供电（3.3V），且整个测试环境需要共GND。

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System clock:
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Internal HRC 24MHz.

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Pin connection:
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SPI0_NSS ----- PB12
SPI0_SCK ----- PB10
SPI0_MISO ---- PC5
SPI0_MOSI ---- PC6
USART0_TX  --- PA2
USART0_RX  --- PA3