增加modbus功能，待测试

zhyinch

2022-01-23 bcd3024235d04c926f8a915500927232435137a7

 源码/核心板/MDK-ARM/Project.uvprojx

@@ -402,6 +402,11 @@
              <FileType>1</FileType>
              <FilePath>..\Src\application\dw_app.c</FilePath>
            </File>
            <File>
              <FileName>modbus.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Src\application\modbus.c</FilePath>
            </File>
          </Files>
        </Group>
        <Group>