From 208aa3d8d605329dbba96c5b40d0245b067d68c0 Mon Sep 17 00:00:00 2001
From: XIVN1987 <XIVN1987@163.com>
Date: Sat, 3 Jun 2023 19:53:49 +0800
Subject: [PATCH] CH32V203 UART DMA enable

---
 CH32V203/.cproject         |  26 +++----
 CH32V203/.project          |  14 ++--
 CH32V203/.template         |  11 ++-
 CH32V203/DAPLink.launch    |  62 +++++++++++++++
 CH32V203/DAPLink.wvproj    | Bin 202 -> 202 bytes
 CH32V203/link.ld           |   1 +
 CH32V203/src/link.ld       |   1 -
 CH32V203/src/main.c        |  26 +++++++
 CH32V203/src/vcom_serial.c | 153 +++++++++++++++++--------------------
 9 files changed, 182 insertions(+), 112 deletions(-)
 create mode 100644 CH32V203/DAPLink.launch
 create mode 100644 CH32V203/link.ld
 delete mode 100644 CH32V203/src/link.ld

diff --git a/CH32V203/.cproject b/CH32V203/.cproject
index 4336a52..23f900a 100644
--- a/CH32V203/.cproject
+++ b/CH32V203/.cproject
@@ -20,9 +20,9 @@
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.addtools.createflash.1311852988" name="Create flash image" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.addtools.createflash" useByScannerDiscovery="false" value="true" valueType="boolean"/>
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.addtools.createlisting.1983282875" name="Create extended listing" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.addtools.createlisting" useByScannerDiscovery="false" value="true" valueType="boolean"/>
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.addtools.printsize.1000761142" name="Print size" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.addtools.printsize" useByScannerDiscovery="false" value="true" valueType="boolean"/>
-							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.level.514997414" name="Optimization Level" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.level" useByScannerDiscovery="true" value="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.level.size" valueType="enumerated"/>
+							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.level.514997414" name="Optimization Level" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.level" useByScannerDiscovery="true" value="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.level.optimize" valueType="enumerated"/>
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.messagelength.1008570639" name="Message length (-fmessage-length=0)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.messagelength" useByScannerDiscovery="true" value="true" valueType="boolean"/>
-							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.signedchar.467272439" name="'char' is signed (-fsigned-char)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.signedchar" useByScannerDiscovery="true" value="false" valueType="boolean"/>
+							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.signedchar.467272439" name="'char' is signed (-fsigned-char)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.signedchar" useByScannerDiscovery="true" value="true" valueType="boolean"/>
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.functionsections.2047756949" name="Function sections (-ffunction-sections)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.functionsections" useByScannerDiscovery="true" value="true" valueType="boolean"/>
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.datasections.207613650" name="Data sections (-fdata-sections)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.datasections" useByScannerDiscovery="true" value="true" valueType="boolean"/>
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.debugging.level.1204865254" name="Debug level" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.debugging.level" useByScannerDiscovery="true"/>
@@ -45,25 +45,23 @@
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.isa.atomic.1590833110" name="Atomic extension (RVA)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.isa.atomic" useByScannerDiscovery="false" value="true" valueType="boolean"/>
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.warnings.unused.1961191588" name="Warn on various unused elements (-Wunused)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.warnings.unused" useByScannerDiscovery="true" value="false" valueType="boolean"/>
 							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.warnings.uninitialized.929829166" name="Warn on uninitialized variables (-Wuninitialized)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.warnings.uninitialized" useByScannerDiscovery="true" value="true" valueType="boolean"/>
-							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.isa.xw.1773073211" name="Extra Compressed extension (RVXW)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.isa.xw" value="true" valueType="boolean"/>
-							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.saverestore.1724088233" name="Small prologue/epilogue (-msave-restore)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.saverestore" value="true" valueType="boolean"/>
-							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.nocommon.82521867" name="No common unitialized (-fno-common)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.nocommon" value="true" valueType="boolean"/>
+							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.nocommon.438890136" name="No common unitialized (-fno-common)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.optimization.nocommon" useByScannerDiscovery="true" value="true" valueType="boolean"/>
+							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.isa.xw.1540402642" name="Extra Compressed extension (RVXW)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.isa.xw" useByScannerDiscovery="false" value="true" valueType="boolean"/>
+							<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.saverestore.813643495" name="Small prologue/epilogue (-msave-restore)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.saverestore" useByScannerDiscovery="false" value="true" valueType="boolean"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="ilg.gnumcueclipse.managedbuild.cross.riscv.targetPlatform.1944008784" isAbstract="false" osList="all" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.targetPlatform"/>
-							<builder buildPath="${workspace_loc:/USART_DMA}/obj" id="ilg.gnumcueclipse.managedbuild.cross.riscv.builder.1421508906" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.builder"/>
+							<builder buildPath="${workspace_loc:/${ProjName}}/obj" id="ilg.gnumcueclipse.managedbuild.cross.riscv.builder.1421508906" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.builder"/>
 							<tool id="ilg.gnumcueclipse.managedbuild.cross.riscv.tool.assembler.1244756189" name="GNU RISC-V Cross Assembler" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.tool.assembler">
 								<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.assembler.usepreprocessor.1692176068" name="Use preprocessor" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.assembler.usepreprocessor" useByScannerDiscovery="false" value="true" valueType="boolean"/>
-								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.assembler.include.paths.1034038285" name="Include paths (-I)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.assembler.include.paths" useByScannerDiscovery="true" valueType="includePath">
-									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/src/Startup}&quot;"/>
-								</option>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="true" id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.assembler.include.paths.1034038285" name="Include paths (-I)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.assembler.include.paths" useByScannerDiscovery="true" valueType="includePath"/>
 								<inputType id="ilg.gnumcueclipse.managedbuild.cross.riscv.tool.assembler.input.126366858" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.tool.assembler.input"/>
 							</tool>
 							<tool id="ilg.gnumcueclipse.managedbuild.cross.riscv.tool.c.compiler.1731377187" name="GNU RISC-V Cross C Compiler" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.tool.c.compiler">
 								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.compiler.include.paths.1567947810" name="Include paths (-I)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.compiler.include.paths" useByScannerDiscovery="true" valueType="includePath">
-									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/src}&quot;"/>
-									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/src/Startup}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/src/Peripheral}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/src/Startup}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/src/USBLib}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/src/USBUsr}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/src}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/core/DAP}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/core/SWD_host}&quot;"/>
 								</option>
@@ -78,7 +76,7 @@
 								<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.gcsections.194760422" name="Remove unused sections (-Xlinker --gc-sections)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.gcsections" useByScannerDiscovery="false" value="true" valueType="boolean"/>
 								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="true" id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.paths.2057340378" name="Library search path (-L)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.paths" useByScannerDiscovery="false" valueType="libPaths"/>
 								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.scriptfile.1390103472" name="Script files (-T)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.scriptfile" useByScannerDiscovery="false" valueType="stringList">
-									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/src/link.ld}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/link.ld}&quot;"/>
 								</option>
 								<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.nostart.913830613" name="Do not use standard start files (-nostartfiles)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.nostart" useByScannerDiscovery="false" value="true" valueType="boolean"/>
 								<option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.usenewlibnano.239404511" name="Use newlib-nano (--specs=nano.specs)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.usenewlibnano" useByScannerDiscovery="false" value="true" valueType="boolean"/>
@@ -117,7 +115,7 @@
 						</toolChain>
 					</folderInfo>
 					<sourceEntries>
-						<entry excluding="core|src/Startup/startup_ch32v20x_D8W.S|src/Startup/startup_ch32v20x_D8.S" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
+						<entry excluding="src/Startup/startup_ch32v20x_D8W.S|src/Startup/startup_ch32v20x_D8.S|core|Startup/startup_ch32v20x_D8W.S|Startup/startup_ch32v20x_D8.S" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
 						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="core"/>
 					</sourceEntries>
 				</configuration>
@@ -140,5 +138,5 @@
 	</storageModule>
 	<storageModule moduleId="org.eclipse.cdt.core.LanguageSettingsProviders"/>
 	<storageModule moduleId="org.eclipse.cdt.make.core.buildtargets"/>
-	
+	<storageModule moduleId="refreshScope"/>
 </cproject>
diff --git a/CH32V203/.project b/CH32V203/.project
index c583922..f7b3877 100644
--- a/CH32V203/.project
+++ b/CH32V203/.project
@@ -1,18 +1,18 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<?xml version="1.0" encoding="UTF-8" ?> 
 <projectDescription>
   <name>DAPLink</name>
-  <comment/>
-  <projects/>
+  <comment />
+  <projects />
   <buildSpec>
     <buildCommand>
       <name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
       <triggers>clean,full,incremental,</triggers>
-      <arguments/>
+      <arguments />
     </buildCommand>
     <buildCommand>
       <name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name>
       <triggers>full,incremental,</triggers>
-      <arguments/>
+      <arguments />
     </buildCommand>
   </buildSpec>
   <natures>
@@ -22,8 +22,8 @@
   </natures>
   <filteredResources>
     <filter>
-      <id>1672839367507</id>
-      <name/>
+      <id>1595986042669</id>
+      <name />
       <type>22</type>
       <matcher>
         <id>org.eclipse.ui.ide.multiFilter</id>
diff --git a/CH32V203/.template b/CH32V203/.template
index eaa9f3f..515add5 100644
--- a/CH32V203/.template
+++ b/CH32V203/.template
@@ -1,17 +1,16 @@
 Address=0x08000000
+Target Path=obj/DAPLink.hex
 Erase All=true
 Program=true
 Verify=true
 Reset=true
-
 Toolchain=RISC-V
 Series=CH32V203
-Description=ROM(byte): 64K, SRAM(byte): 20K, CHIP PINS: 32, GPIO PORTS: 27.\nWCH CH32V2 series of mainstream MCUs covers the needs of a large variety of applications in the industrial,medical and consumer markets. High performance with first-class peripherals and low-power,low-voltage operation is paired with a high level of integration at accessible prices with a simple architecture and easy-to-use tools.
-
-PeripheralVersion=1.0
-Target Path=obj/DAPLink.hex
+RTOS=NoneOS
+Description=Website: http://www.wch.cn/products/CH32V203.html?\nROM(byte): 32K, SRAM(byte): 10K, CHIP PINS: 48, GPIO PORTS: 37.\nWCH CH32V2 series of mainstream MCUs covers the needs of a large variety of applications in the industrial,medical and consumer markets. High performance with first-class peripherals and low-power,low-voltage operation is paired with a high level of integration at accessible prices with a simple architecture and easy-to-use tools.
+PeripheralVersion=1.7
 
 Vendor=WCH
 MCU=CH32V203F6P6
 Mcu Type=CH32V20x
-Link=WCH-Link
+Link=WCH-Link
\ No newline at end of file
diff --git a/CH32V203/DAPLink.launch b/CH32V203/DAPLink.launch
new file mode 100644
index 0000000..022ffea
--- /dev/null
+++ b/CH32V203/DAPLink.launch
@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<launchConfiguration type="com.mounriver.debug.gdbjtag.openocd.launchConfigurationType">
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.PERIPHERALS" value="&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; standalone=&quot;no&quot;?&gt;&#13;&#10;&lt;peripherals&gt;&#13;&#10;&lt;peripheral name=&quot;DMA1&quot;/&gt;&#13;&#10;&lt;/peripherals&gt;&#13;&#10;"/>
+<booleanAttribute key="com.mounriver.debug.gdbjtag.openocd.doContinue" value="true"/>
+<booleanAttribute key="com.mounriver.debug.gdbjtag.openocd.doDebugInRam" value="false"/>
+<booleanAttribute key="com.mounriver.debug.gdbjtag.openocd.doFirstReset" value="true"/>
+<booleanAttribute key="com.mounriver.debug.gdbjtag.openocd.doGdbServerAllocateConsole" value="true"/>
+<booleanAttribute key="com.mounriver.debug.gdbjtag.openocd.doGdbServerAllocateTelnetConsole" value="false"/>
+<booleanAttribute key="com.mounriver.debug.gdbjtag.openocd.doSecondReset" value="true"/>
+<booleanAttribute key="com.mounriver.debug.gdbjtag.openocd.doStartGdbCLient" value="true"/>
+<booleanAttribute key="com.mounriver.debug.gdbjtag.openocd.doStartGdbServer" value="true"/>
+<booleanAttribute key="com.mounriver.debug.gdbjtag.openocd.enableSemihosting" value="false"/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.firstResetType" value="init"/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.gdbClientOtherCommands" value="set mem inaccessible-by-default off&#13;&#10;set architecture riscv:rv32&#13;&#10;set remotetimeout unlimited"/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.gdbClientOtherOptions" value=""/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.gdbServerConnectionAddress" value=""/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.gdbServerExecutable" value="${eclipse_home}toolchain/OpenOCD/bin/openocd.exe"/>
+<intAttribute key="com.mounriver.debug.gdbjtag.openocd.gdbServerGdbPortNumber" value="3333"/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.gdbServerLog" value=""/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.gdbServerOther" value="-f &quot;${eclipse_home}toolchain/OpenOCD/bin/wch-riscv.cfg&quot;"/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.gdbServerTclPortNumber" value="6666"/>
+<intAttribute key="com.mounriver.debug.gdbjtag.openocd.gdbServerTelnetPortNumber" value="4444"/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.otherInitCommands" value=""/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.otherRunCommands" value=""/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.openocd.secondResetType" value="halt"/>
+<stringAttribute key="com.mounriver.debug.gdbjtag.svdPath" value="${eclipse_home}template/wizard/WCH/RISC-V/CH32V203/NoneOS/CH32V203xx.svd"/>
+<stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.imageFileName" value=""/>
+<stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.imageOffset" value=""/>
+<stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.ipAddress" value="localhost"/>
+<stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.jtagDevice" value="GNU MCU OpenOCD"/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.loadImage" value="true"/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.loadSymbols" value="true"/>
+<stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.pcRegister" value=""/>
+<intAttribute key="org.eclipse.cdt.debug.gdbjtag.core.portNumber" value="3333"/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.setPcRegister" value="false"/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.setResume" value="false"/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.setStopAt" value="true"/>
+<stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.stopAt" value="handle_reset"/>
+<stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.symbolsFileName" value=""/>
+<stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.symbolsOffset" value=""/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.useFileForImage" value="false"/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.useFileForSymbols" value="false"/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.useProjBinaryForImage" value="true"/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.useProjBinaryForSymbols" value="true"/>
+<booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.useRemoteTarget" value="true"/>
+<stringAttribute key="org.eclipse.cdt.dsf.gdb.DEBUG_NAME" value="${eclipse_home}toolchain/RISC-V Embedded GCC/bin/riscv-none-embed-gdb.exe"/>
+<booleanAttribute key="org.eclipse.cdt.dsf.gdb.UPDATE_THREADLIST_ON_SUSPEND" value="false"/>
+<intAttribute key="org.eclipse.cdt.launch.ATTR_BUILD_BEFORE_LAUNCH_ATTR" value="2"/>
+<stringAttribute key="org.eclipse.cdt.launch.COREFILE_PATH" value=""/>
+<stringAttribute key="org.eclipse.cdt.launch.PROGRAM_NAME" value="obj\DAPLink.elf"/>
+<stringAttribute key="org.eclipse.cdt.launch.PROJECT_ATTR" value="DAPLink"/>
+<booleanAttribute key="org.eclipse.cdt.launch.PROJECT_BUILD_CONFIG_AUTO_ATTR" value="true"/>
+<stringAttribute key="org.eclipse.cdt.launch.PROJECT_BUILD_CONFIG_ID_ATTR" value=""/>
+<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_PATHS">
+<listEntry value="/DAPLink"/>
+</listAttribute>
+<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_TYPES">
+<listEntry value="4"/>
+</listAttribute>
+<stringAttribute key="org.eclipse.dsf.launch.MEMORY_BLOCKS" value="&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; standalone=&quot;no&quot;?&gt;&#13;&#10;&lt;memoryBlockExpressionList context=&quot;Context string&quot;/&gt;&#13;&#10;"/>
+<stringAttribute key="process_factory_id" value="org.eclipse.cdt.dsf.gdb.GdbProcessFactory"/>
+</launchConfiguration>
diff --git a/CH32V203/DAPLink.wvproj b/CH32V203/DAPLink.wvproj
index 2cd99d9829581898ccce5a4795f490281d640232..6974dadee9b8bcda5764d42f47a652d13e6abe88 100644
GIT binary patch
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zeNUq%55ZH976BZslu4GugOxR7um(6rpa6x5jjkJu9DY-JXSQ38QhlHu3@0EyED%a5
zC8Bzxu#!DjG?XovC0DT%#zGabe6DG`IKBX$xPSmIe0Tv~P`axvOFXbNa<&5$u{tyb
zM~(tXy=ZH&e7QrMfPzk3tP8`9yMrhs5UGq=Gl5MOsbWuUeq4n&G8YG6g>Gm-xC%OL
E3gTu^4gdfE

literal 202
zcmV;*05$)Q5@~;ve?xy-3keQCBFBNaa-V?#Mm$D&I7K;GhrNU)P#<BlM7B&}h6^Rb
zCm0rafT3N-JCe2^pHnF@hA}HrG(J3nE)ayr#lN~37O(>xKQE(LPpQPeLl<ZpQBEW(
zqLjNu0mTzSYl|TPGIWe9Vs&VSZdGDkcx;Pod<rWfpFESVK}Zf2G%|g9IB*U-Z5V)c
z95Ie91EytYyH8}if5LaQsyBFhHGxBMMR*&jJv*kNWum&f4>F^Q34*H?6e=7-Pz+6)
EB85gun*aa+

diff --git a/CH32V203/link.ld b/CH32V203/link.ld
new file mode 100644
index 0000000..965aa94
--- /dev/null
+++ b/CH32V203/link.ld
@@ -0,0 +1 @@
+ENTRY( _start )

__stack_size = 4096;

PROVIDE( _stack_size = __stack_size );


MEMORY
{  
/* CH32V20x_D6 - CH32V203F6-CH32V203G6-CH32V203K6-CH32V203C6 */

	FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 32K
	RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 10K


/* CH32V20x_D6 - CH32V203K8-CH32V203C8-CH32V203G8-CH32V203F8 */
/*
	FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 64K
	RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 20K
*/ 
  
/* CH32V20x_D8 - CH32V203RB
   CH32V20x_D8W - CH32V208x
   FLASH + RAM supports the following configuration
   FLASH-128K + RAM-64K
   FLASH-144K + RAM-48K
   FLASH-160K + RAM-32K
*/
/*
	FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 160K
	RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 32K
*/

}


SECTIONS
{

	.init :
	{
		_sinit = .;
		. = ALIGN(4);
		KEEP(*(SORT_NONE(.init)))
		. = ALIGN(4);
		_einit = .;
	} >FLASH AT>FLASH

  .vector :
  {
      *(.vector);
	  . = ALIGN(64);
  } >FLASH AT>FLASH

	.text :
	{
		. = ALIGN(4);
		*(.text)
		*(.text.*)
		*(.rodata)
		*(.rodata*)
		*(.glue_7)
		*(.glue_7t)
		*(.gnu.linkonce.t.*)
		. = ALIGN(4);
	} >FLASH AT>FLASH 

	.fini :
	{
		KEEP(*(SORT_NONE(.fini)))
		. = ALIGN(4);
	} >FLASH AT>FLASH

	PROVIDE( _etext = . );
	PROVIDE( _eitcm = . );	

	.preinit_array  :
	{
	  PROVIDE_HIDDEN (__preinit_array_start = .);
	  KEEP (*(.preinit_array))
	  PROVIDE_HIDDEN (__preinit_array_end = .);
	} >FLASH AT>FLASH 
	
	.init_array     :
	{
	  PROVIDE_HIDDEN (__init_array_start = .);
	  KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
	  KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))
	  PROVIDE_HIDDEN (__init_array_end = .);
	} >FLASH AT>FLASH 
	
	.fini_array     :
	{
	  PROVIDE_HIDDEN (__fini_array_start = .);
	  KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
	  KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))
	  PROVIDE_HIDDEN (__fini_array_end = .);
	} >FLASH AT>FLASH 
	
	.ctors          :
	{
	  /* gcc uses crtbegin.o to find the start of
	     the constructors, so we make sure it is
	     first.  Because this is a wildcard, it
	     doesn't matter if the user does not
	     actually link against crtbegin.o; the
	     linker won't look for a file to match a
	     wildcard.  The wildcard also means that it
	     doesn't matter which directory crtbegin.o
	     is in.  */
	  KEEP (*crtbegin.o(.ctors))
	  KEEP (*crtbegin?.o(.ctors))
	  /* We don't want to include the .ctor section from
	     the crtend.o file until after the sorted ctors.
	     The .ctor section from the crtend file contains the
	     end of ctors marker and it must be last */
	  KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
	  KEEP (*(SORT(.ctors.*)))
	  KEEP (*(.ctors))
	} >FLASH AT>FLASH 
	
	.dtors          :
	{
	  KEEP (*crtbegin.o(.dtors))
	  KEEP (*crtbegin?.o(.dtors))
	  KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
	  KEEP (*(SORT(.dtors.*)))
	  KEEP (*(.dtors))
	} >FLASH AT>FLASH 

	.dalign :
	{
		. = ALIGN(4);
		PROVIDE(_data_vma = .);
	} >RAM AT>FLASH	

	.dlalign :
	{
		. = ALIGN(4); 
		PROVIDE(_data_lma = .);
	} >FLASH AT>FLASH

	.data :
	{
    	*(.gnu.linkonce.r.*)
    	*(.data .data.*)
    	*(.gnu.linkonce.d.*)
		. = ALIGN(8);
    	PROVIDE( __global_pointer$ = . + 0x800 );
    	*(.sdata .sdata.*)
		*(.sdata2.*)
    	*(.gnu.linkonce.s.*)
    	. = ALIGN(8);
    	*(.srodata.cst16)
    	*(.srodata.cst8)
    	*(.srodata.cst4)
    	*(.srodata.cst2)
    	*(.srodata .srodata.*)
    	. = ALIGN(4);
		PROVIDE( _edata = .);
	} >RAM AT>FLASH

	.bss :
	{
		. = ALIGN(4);
		PROVIDE( _sbss = .);
  	    *(.sbss*)
        *(.gnu.linkonce.sb.*)
		*(.bss*)
     	*(.gnu.linkonce.b.*)		
		*(COMMON*)
		. = ALIGN(4);
		PROVIDE( _ebss = .);
	} >RAM AT>FLASH

	PROVIDE( _end = _ebss);
	PROVIDE( end = . );

    .stack ORIGIN(RAM) + LENGTH(RAM) - __stack_size :
    {
        PROVIDE( _heap_end = . );   
        . = ALIGN(4);
        PROVIDE(_susrstack = . );
        . = . + __stack_size;
        PROVIDE( _eusrstack = .);
    } >RAM 

}



\ No newline at end of file
diff --git a/CH32V203/src/link.ld b/CH32V203/src/link.ld
deleted file mode 100644
index 7b8d968..0000000
--- a/CH32V203/src/link.ld
+++ /dev/null
@@ -1 +0,0 @@
-ENTRY( _start )

__stack_size = 2048;

PROVIDE( _stack_size = __stack_size );


MEMORY
{  
/* CH32V20x_D6 - CH32V203F6-CH32V203G6-CH32V203K6-CH32V203C6 */
/**/ 
	FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 32K
	RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 10K


/* CH32V20x_D6 - CH32V203K8-CH32V203C8-CH32V203G8-CH32V203F8 */
/*
	FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 64K
	RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 20K
 */
  
/* CH32V20x_D8 - CH32V203RB
   CH32V20x_D8W - CH32V208x
   FLASH + RAM supports the following configuration
   FLASH-128K + RAM-64K
   FLASH-144K + RAM-48K
   FLASH-160K + RAM-32K

	FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 160K
	RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 32K
*/
}


SECTIONS
{

	.init :
	{
		_sinit = .;
		. = ALIGN(4);
		KEEP(*(SORT_NONE(.init)))
		. = ALIGN(4);
		_einit = .;
	} >FLASH AT>FLASH

  .vector :
  {
      *(.vector);
	  . = ALIGN(64);
  } >FLASH AT>FLASH

	.text :
	{
		. = ALIGN(4);
		*(.text)
		*(.text.*)
		*(.rodata)
		*(.rodata*)
		*(.gnu.linkonce.t.*)
		. = ALIGN(4);
	} >FLASH AT>FLASH 

	.fini :
	{
		KEEP(*(SORT_NONE(.fini)))
		. = ALIGN(4);
	} >FLASH AT>FLASH

	PROVIDE( _etext = . );
	PROVIDE( _eitcm = . );	

	.preinit_array  :
	{
	  PROVIDE_HIDDEN (__preinit_array_start = .);
	  KEEP (*(.preinit_array))
	  PROVIDE_HIDDEN (__preinit_array_end = .);
	} >FLASH AT>FLASH 
	
	.init_array     :
	{
	  PROVIDE_HIDDEN (__init_array_start = .);
	  KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
	  KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))
	  PROVIDE_HIDDEN (__init_array_end = .);
	} >FLASH AT>FLASH 
	
	.fini_array     :
	{
	  PROVIDE_HIDDEN (__fini_array_start = .);
	  KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
	  KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))
	  PROVIDE_HIDDEN (__fini_array_end = .);
	} >FLASH AT>FLASH 
	
	.ctors          :
	{
	  /* gcc uses crtbegin.o to find the start of
	     the constructors, so we make sure it is
	     first.  Because this is a wildcard, it
	     doesn't matter if the user does not
	     actually link against crtbegin.o; the
	     linker won't look for a file to match a
	     wildcard.  The wildcard also means that it
	     doesn't matter which directory crtbegin.o
	     is in.  */
	  KEEP (*crtbegin.o(.ctors))
	  KEEP (*crtbegin?.o(.ctors))
	  /* We don't want to include the .ctor section from
	     the crtend.o file until after the sorted ctors.
	     The .ctor section from the crtend file contains the
	     end of ctors marker and it must be last */
	  KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
	  KEEP (*(SORT(.ctors.*)))
	  KEEP (*(.ctors))
	} >FLASH AT>FLASH 
	
	.dtors          :
	{
	  KEEP (*crtbegin.o(.dtors))
	  KEEP (*crtbegin?.o(.dtors))
	  KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
	  KEEP (*(SORT(.dtors.*)))
	  KEEP (*(.dtors))
	} >FLASH AT>FLASH 

	.dalign :
	{
		. = ALIGN(4);
		PROVIDE(_data_vma = .);
	} >RAM AT>FLASH	

	.dlalign :
	{
		. = ALIGN(4); 
		PROVIDE(_data_lma = .);
	} >FLASH AT>FLASH

	.data :
	{
    	*(.gnu.linkonce.r.*)
    	*(.data .data.*)
    	*(.gnu.linkonce.d.*)
		. = ALIGN(8);
    	PROVIDE( __global_pointer$ = . + 0x800 );
    	*(.sdata .sdata.*)
		*(.sdata2.*)
    	*(.gnu.linkonce.s.*)
    	. = ALIGN(8);
    	*(.srodata.cst16)
    	*(.srodata.cst8)
    	*(.srodata.cst4)
    	*(.srodata.cst2)
    	*(.srodata .srodata.*)
    	. = ALIGN(4);
		PROVIDE( _edata = .);
	} >RAM AT>FLASH

	.bss :
	{
		. = ALIGN(4);
		PROVIDE( _sbss = .);
  	    *(.sbss*)
        *(.gnu.linkonce.sb.*)
		*(.bss*)
     	*(.gnu.linkonce.b.*)		
		*(COMMON*)
		. = ALIGN(4);
		PROVIDE( _ebss = .);
	} >RAM AT>FLASH

	PROVIDE( _end = _ebss);
	PROVIDE( end = . );

    .stack ORIGIN(RAM) + LENGTH(RAM) - __stack_size :
    {
        PROVIDE( _heap_end = . );   
        . = ALIGN(4);
        PROVIDE(_susrstack = . );
        . = . + __stack_size;
        PROVIDE( _eusrstack = .);
    } >RAM 

}



\ No newline at end of file
diff --git a/CH32V203/src/main.c b/CH32V203/src/main.c
index 5b5b340..27a8cfd 100644
--- a/CH32V203/src/main.c
+++ b/CH32V203/src/main.c
@@ -7,6 +7,9 @@
 
 extern uint8_t usbd_hid_process(void);
 
+volatile uint32_t SysTick_ms = 0;
+
+void SysTick_Config(uint32_t ticks);
 void USB_Config(void);
 
 int main(void)
@@ -16,6 +19,8 @@ int main(void)
     VCOM_Init();
 
     USB_Config();
+
+    SysTick_Config(SystemCoreClock / 1000);
  	
 	while(1)
 	{
@@ -26,6 +31,27 @@ int main(void)
 }
 
 
+void SysTick_Config(uint32_t ticks)
+{
+    SysTick->CTLR= 0;
+    SysTick->SR  = 0;
+    SysTick->CNT = 0;
+    SysTick->CMP = ticks;
+    SysTick->CTLR= 0x0F;
+
+    NVIC_EnableIRQ(SysTicK_IRQn);
+}
+
+
+void SysTick_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
+void SysTick_Handler(void)
+{
+    SysTick->SR = 0;
+
+    SysTick_ms++;
+}
+
+
 void USB_Config(void)
 {
     NVIC_InitTypeDef NVIC_InitStructure;
diff --git a/CH32V203/src/vcom_serial.c b/CH32V203/src/vcom_serial.c
index d146bdb..e87a191 100644
--- a/CH32V203/src/vcom_serial.c
+++ b/CH32V203/src/vcom_serial.c
@@ -1,3 +1,4 @@
+#include <string.h>
 #include "ch32v20x.h"
 #include "usb_lib.h"
 #include "usb_regs.h"
@@ -10,35 +11,71 @@ volatile VCOM Vcom = {.in_ready = 1};
 VCOM_LINE_CODING LineCfg = {115200, 0, 0, 8};   // Baud rate, stop bits, parity bits, data bits
 
 
+#define RXDMA_SZ  (CDC_BULK_IN_SZ * 2)
+uint8_t RXBuffer[RXDMA_SZ] __attribute__((aligned(4)));
+uint8_t TXBuffer[CDC_BULK_OUT_SZ] __attribute__((aligned(4)));
+
+
 void VCOM_Init(void)
 {
     GPIO_InitTypeDef  GPIO_InitStructure;
     USART_InitTypeDef USART_InitStructure;
+    DMA_InitTypeDef   DMA_InitStructure;
 
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
     RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
+    RCC_AHBPeriphClockCmd (RCC_AHBPeriph_DMA1, ENABLE);
 
     GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_2;
-    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_Init(GPIOA, &GPIO_InitStructure);              // PA2 => USART2_TX
 
     GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_3;
     GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_IPU;
     GPIO_Init(GPIOA, &GPIO_InitStructure);              // PA3 => USART2_RX
 
+
+    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
+    DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART2->DATAR;
+    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
+    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)TXBuffer;
+    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
+    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
+    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
+    DMA_InitStructure.DMA_BufferSize = 0;
+    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
+    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
+    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
+    DMA_Init(DMA1_Channel7, &DMA_InitStructure);
+    DMA_Cmd(DMA1_Channel7, ENABLE);
+
+    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
+    DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART2->DATAR;
+    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
+    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)RXBuffer;
+    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
+    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
+    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
+    DMA_InitStructure.DMA_BufferSize = RXDMA_SZ;
+    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
+    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
+    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
+    DMA_Init(DMA1_Channel6, &DMA_InitStructure);
+    DMA_Cmd(DMA1_Channel6, ENABLE);
+
+
     USART_InitStructure.USART_BaudRate = 115200;
     USART_InitStructure.USART_WordLength = USART_WordLength_8b;
     USART_InitStructure.USART_StopBits = USART_StopBits_1;
     USART_InitStructure.USART_Parity = USART_Parity_No;
-    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
     USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
     USART_Init(USART2, &USART_InitStructure);
 
-    USART_Cmd(USART2, ENABLE);
+    USART_DMACmd(USART2, USART_DMAReq_Tx | USART_DMAReq_Rx, ENABLE);
 
-    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
-	NVIC_EnableIRQ(USART2_IRQn);
+    USART_Cmd(USART2, ENABLE);
 }
 
 
@@ -71,88 +108,46 @@ void VCOM_LineCoding(VCOM_LINE_CODING * LineCfgx)
     }
 
     USART_InitStructure.USART_BaudRate = LineCfgx->u32DTERate;
-    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
     USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
 
 
     __disable_irq();
     
-    // Reset software FIFO
-    Vcom.rx_bytes = 0;
-	Vcom.rx_wrptr = 0;
-    Vcom.rx_rdptr = 0;
-
-    Vcom.tx_bytes = 0;
-	Vcom.tx_wrptr = 0;
-    Vcom.tx_rdptr = 0;
-    
     USART_Init(USART2, &USART_InitStructure);
     
     __enable_irq();
 }
 
 
-void USART2_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
-
-void USART2_IRQHandler(void)
-{
-	if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
-	{
-		uint16_t chr = USART_ReceiveData(USART2);
-		
-		if(Vcom.rx_bytes < RX_BUFF_SIZE)
-		{
-			Vcom.rx_buff[Vcom.rx_wrptr++] = chr;
-			if(Vcom.rx_wrptr == RX_BUFF_SIZE)
-				Vcom.rx_wrptr = 0;
-			
-			Vcom.rx_bytes++;
-		}
-	}
-	
-	if(USART_GetITStatus(USART2, USART_IT_TXE) != RESET)
-	{
-		if(Vcom.tx_bytes)
-        {
-		    USART_SendData(USART2, Vcom.tx_buff[Vcom.tx_rdptr++]);
-			if(Vcom.tx_rdptr == TX_BUFF_SIZE)
-				Vcom.tx_rdptr = 0;
-			
-			Vcom.tx_bytes--;
-        }
-        else
-        {
-            /* No more data, just stop Tx (Stop work) */
-            USART_ITConfig(USART2, USART_IT_TXE, DISABLE);
-        }
-	}
-}
-
+extern volatile uint32_t SysTick_ms;
 
 void VCOM_TransferData(void)
 {
+    static uint32_t last_ms = 0;
+    static uint32_t last_pos = 0;
+
     if(Vcom.in_ready)		// 可以向主机发送数据
     {
-        if(Vcom.rx_bytes)	// 有新的数据可以发送
+        uint32_t pos = RXDMA_SZ - DMA_GetCurrDataCounter(DMA1_Channel6);
+        if((pos - last_pos >= CDC_BULK_IN_SZ) || ((pos != last_pos) && (SysTick_ms != last_ms)))
         {
-            Vcom.in_bytes = Vcom.rx_bytes;
-            if(Vcom.in_bytes > CDC_BULK_IN_SZ)
-                Vcom.in_bytes = CDC_BULK_IN_SZ;
+            if(pos < last_pos)
+                pos = RXDMA_SZ;
 
-            for(int i = 0; i < Vcom.in_bytes; i++)
-            {
-                Vcom.in_buff[i] = Vcom.rx_buff[Vcom.rx_rdptr++];
-                if(Vcom.rx_rdptr >= RX_BUFF_SIZE)
-                    Vcom.rx_rdptr = 0;
-            }
+            if(pos - last_pos > CDC_BULK_IN_SZ)
+                pos = last_pos + CDC_BULK_IN_SZ;
 
-            __disable_irq();
-            Vcom.rx_bytes -= Vcom.in_bytes;
-            __enable_irq();
+            Vcom.in_bytes = pos - last_pos;
 
             Vcom.in_ready = 0;
-            USB_SIL_Write(EP3_IN, (uint8_t *)Vcom.in_buff, Vcom.in_bytes);
+
+            USB_SIL_Write(EP3_IN, &RXBuffer[last_pos], Vcom.in_bytes);
             SetEPTxValid(ENDP3);
+
+            last_pos = pos % RXDMA_SZ;
+
+            last_ms = SysTick_ms;
         }
         else
         {
@@ -161,35 +156,25 @@ void VCOM_TransferData(void)
             if(Vcom.in_bytes == CDC_BULK_IN_SZ)
 			{
 				Vcom.in_bytes = 0;
-				
-				USB_SIL_Write(EP3_IN, (uint8_t *)Vcom.in_buff, 0);
+
+				USB_SIL_Write(EP3_IN, (uint8_t *)0, 0);
 				SetEPTxValid(ENDP3);
 			}
         }
     }
 
-	/* 从主机接收到数据，且 tx_buff 能够装下它们 */
-    if(Vcom.out_ready && (Vcom.out_bytes <= TX_BUFF_SIZE - Vcom.tx_bytes))
+	/* 从主机接收到数据，且前面的数据 DMA 已发送完 */
+    if(Vcom.out_ready && (DMA_GetCurrDataCounter(DMA1_Channel7) == 0))
     {
-        for(int i = 0; i < Vcom.out_bytes; i++)
-        {
-            Vcom.tx_buff[Vcom.tx_wrptr++] = Vcom.out_buff[i];
-            if(Vcom.tx_wrptr >= TX_BUFF_SIZE)
-                Vcom.tx_wrptr = 0;
-        }
+        Vcom.out_ready = 0;
 
-        __disable_irq();
-        Vcom.tx_bytes += Vcom.out_bytes;
-        __enable_irq();
+        memcpy(TXBuffer, (uint8_t *)Vcom.out_buff, Vcom.out_bytes);
 
-        Vcom.out_ready = 0;
+        DMA_Cmd(DMA1_Channel7, DISABLE);
+        DMA_SetCurrDataCounter(DMA1_Channel7, Vcom.out_bytes);
+        DMA_Cmd(DMA1_Channel7, ENABLE);
 
         /* Ready for next BULK OUT */
 		SetEPRxValid(ENDP3);
     }
-
-    if(Vcom.tx_bytes && ((USART2->CTLR1 & USART_CTLR1_TXEIE) == 0))
-    {
-        USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
-    }
 }