/**
  ******************************************************************************
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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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) 2022 Shanghai Eastsoft Microelectronics Co., Ltd. ALL rights reserved.
  *******************************************************************************
  */

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Version history:
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2023-03-09       V1.0.0      AE TEAM

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Demo introduction:
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本示例功能：APP程序，需要BOOT程序进行跳转。作为USB MSC设备，被PC识别。从USB MSC主机（PC）中获取新APP。
更新APP的方式为：在PC上，将新的带CRC校验的APP存入MSC设备。

各区域划分如下：

地址范围                       功能
0x00000 - 0x01FFF（8k）        BOOT程序
0x02000 - 0x1FFFF（120k）      正在运行的APP程序
0x20000 - 0x3FFFF（128k）      被下载的新APP程序或其他

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测试环境:
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测试用板；
ES-PDS-ES32VF2264LT-T2
需要对开发板进行如下操作：
1.闭合JP1、JP2、JP3、JP4。
2.断开SB1、SB2、SB3。

辅助工具：
ES-BUR-ESLINK2OB

辅助软件：
XCOM上位机软件
add_checksum.exe

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测试步骤：
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1) 编译BOOT工程，编译通过后将程序下载到目标芯片。BOOT工程的SDK绝对路径为：
\Projects\ES32VF2264\Applications\Bootloader\03_backup_app_boot\00_boot
2) 编译APP工程，编译通过后将程序下载到目标芯片。
3) 复位芯片，或在线调试，运行程序。
4) 将USB_OTG接口与PC USB连接。
5) 等待USB设备枚举完成。
6) 打开MCU固件校验码添加工具add_checksum.exe，路径为：es32-sdk-for-risc-v\Utilities\add_checksum.exe。具体操作如下：
"Hex/Bin"：CDK\Obj\demo_0x2000.bin。
“校验方式”：CRC校验
“校验和保存地址”：0x1E000
“校验和计算长度”：0x1E000
“保存格式”：Bin
点击保存，保存为app_crc.bin
7) 在PC上，将app_crc.bin放入USB MSC设备。APP程序将被更新。

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注意：
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System clock:
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PLL 72M

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Pin connection: 
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