From 9670e6d397ce5fadcc87557295c414010f986514 Mon Sep 17 00:00:00 2001
From: abody <attila.body@gmail.com>
Date: Thu, 31 Oct 2019 14:01:38 +0100
Subject: [PATCH] WIP - ready to debug

---
 .cproject             |  44 +++++---
 Makefile              |   2 +-
 Src/stm32f4xx_it.c    |  29 ++---
 app/ll_testbed.cpp    | 149 +++++++++++++++++++++++++
 app/ll_testbed.h      |  27 +++++
 lib/StaticList.h      |  15 +++
 lib/ll_crchandler.cpp | 156 ++++++++++++++++++++++++++
 lib/ll_crchandler.h   |  87 +++++++++++++++
 lib/ll_dmahelper.cpp  |  12 +-
 lib/ll_dmahelper.h    |  30 ++---
 lib/ll_hsusart.cpp    | 250 ++++++++++++++++++++++++++++++++++++++++++
 lib/ll_hsusart.h      | 112 +++++++++++++++++++
 lib/singleton.h       |  27 +++++
 lib/usart_handler.c   |   5 +-
 14 files changed, 893 insertions(+), 52 deletions(-)
 create mode 100644 app/ll_testbed.cpp
 create mode 100644 app/ll_testbed.h
 create mode 100644 lib/StaticList.h
 create mode 100644 lib/ll_crchandler.cpp
 create mode 100644 lib/ll_crchandler.h
 create mode 100644 lib/ll_hsusart.cpp
 create mode 100644 lib/ll_hsusart.h
 create mode 100644 lib/singleton.h

diff --git a/.cproject b/.cproject
index 45f9018..3a11cbf 100644
--- a/.cproject
+++ b/.cproject
@@ -16,19 +16,19 @@
 				<configuration artifactExtension="elf" artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe,org.eclipse.cdt.build.core.buildType=org.eclipse.cdt.build.core.buildType.debug" cleanCommand="rm -rf" description="" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.config.exe.debug.1652594594" name="Debug" parent="com.st.stm32cube.ide.mcu.gnu.managedbuild.config.exe.debug">
 					<folderInfo id="com.st.stm32cube.ide.mcu.gnu.managedbuild.config.exe.debug.1652594594." name="/" resourcePath="">
 						<toolChain id="com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.exe.debug.1244830121" name="MCU ARM GCC" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.exe.debug">
-							<option id="com.st.stm32cube.ide.mcu.option.internal.toolchain.type.1720703955" name="Internal Toolchain Type" superClass="com.st.stm32cube.ide.mcu.option.internal.toolchain.type" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.base.gnu-tools-for-stm32" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.option.internal.toolchain.version.1653632439" name="Internal Toolchain Version" superClass="com.st.stm32cube.ide.mcu.option.internal.toolchain.version" value="7-2018-q2-update" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_mcu.164195990" name="Mcu" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_mcu" value="STM32F407VETx" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_cpuid.462500701" name="CpuId" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_cpuid" value="0" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_coreid.1858367229" name="CpuCoreId" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_coreid" value="0" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.1132685722" name="Floating-point unit" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.value.fpv4-sp-d16" valueType="enumerated"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.639645368" name="Floating-point ABI" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.value.hard" valueType="enumerated"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board.1695232558" name="Board" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board" value="genericBoard" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.157688335" name="Defaults" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.3 || Debug || true || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.base.gnu-tools-for-stm32 || STM32F407VETx || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../Inc | ../Drivers/CMSIS/Include | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../Middlewares/Third_Party/FatFs/src ||  ||  || USE_HAL_DRIVER | USE_FULL_LL_DRIVER | STM32F407xx ||  || Drivers | Src | Middlewares | Startup ||  ||  || ${workspace_loc:/${ProjName}/STM32F407VETX_FLASH.ld} || true || NonSecure ||  || secure_nsclib.o || " valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.option.internal.toolchain.type.1720703955" name="Internal Toolchain Type" superClass="com.st.stm32cube.ide.mcu.option.internal.toolchain.type" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.base.gnu-tools-for-stm32" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.option.internal.toolchain.version.1653632439" name="Internal Toolchain Version" superClass="com.st.stm32cube.ide.mcu.option.internal.toolchain.version" useByScannerDiscovery="false" value="7-2018-q2-update" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_mcu.164195990" name="Mcu" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_mcu" useByScannerDiscovery="false" value="STM32F407VETx" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_cpuid.462500701" name="CpuId" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_cpuid" useByScannerDiscovery="false" value="0" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_coreid.1858367229" name="CpuCoreId" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_coreid" useByScannerDiscovery="false" value="0" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.1132685722" name="Floating-point unit" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.value.fpv4-sp-d16" valueType="enumerated"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.639645368" name="Floating-point ABI" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.value.hard" valueType="enumerated"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board.1695232558" name="Board" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board" useByScannerDiscovery="false" value="genericBoard" valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.157688335" name="Defaults" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" useByScannerDiscovery="false" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.3 || Debug || true || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.base.gnu-tools-for-stm32 || STM32F407VETx || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../Inc | ../Drivers/CMSIS/Include | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../Middlewares/Third_Party/FatFs/src ||  ||  || USE_HAL_DRIVER | USE_FULL_LL_DRIVER | STM32F407xx ||  || Drivers | Src | Middlewares | Startup ||  ||  || ${workspace_loc:/${ProjName}/STM32F407VETX_FLASH.ld} || true || NonSecure ||  || secure_nsclib.o || " valueType="string"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform.1516869560" isAbstract="false" osList="all" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform"/>
 							<builder buildPath="${workspace_loc:/f407ve_hs_uart}/Debug" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder.276958501" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder"/>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.954167919" name="MCU GCC Assembler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler">
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.609392822" name="Debug level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.value.g3" valueType="enumerated"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.609392822" name="Debug level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.option.debuglevel.value.g3" valueType="enumerated"/>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input.1201266469" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.input"/>
 							</tool>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.954718294" name="MCU GCC Compiler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler">
@@ -39,6 +39,7 @@
 									<listOptionValue builtIn="false" value="USE_FULL_LL_DRIVER"/>
 									<listOptionValue builtIn="false" value="DEBUG"/>
 									<listOptionValue builtIn="false" value="STM32F407xx"/>
+									<listOptionValue builtIn="false" value="HAVE_CONFIG"/>
 								</option>
 								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.includepaths.410582808" name="Include paths (-I)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.includepaths" useByScannerDiscovery="false" valueType="includePath">
 									<listOptionValue builtIn="false" value="../Inc"/>
@@ -71,7 +72,9 @@
 									<listOptionValue builtIn="false" value="USE_FULL_LL_DRIVER"/>
 									<listOptionValue builtIn="false" value="DEBUG"/>
 									<listOptionValue builtIn="false" value="STM32F407xx"/>
+									<listOptionValue builtIn="false" value="HAVE_CONFIG"/>
 								</option>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.languagestandard.1833413246" name="Language standard" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.languagestandard" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.languagestandard.value.isocpp14" valueType="enumerated"/>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.input.cpp.1377090173" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.input.cpp"/>
 							</tool>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.1191853047" name="MCU GCC Linker" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker">
@@ -82,8 +85,11 @@
 								</inputType>
 							</tool>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.1392953512" name="MCU G++ Linker" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker">
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.script.725957697" name="Linker Script (-T)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.script" value="${workspace_loc:/${ProjName}/STM32F407VETX_FLASH.ld}" valueType="string"/>
-								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.systemcalls.1962065764" name="System calls" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.systemcalls" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.linker.option.systemcalls.value.minimalimplementation" valueType="enumerated"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.script.725957697" name="Linker Script (-T)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.script" useByScannerDiscovery="false" value="${workspace_loc:/${ProjName}/STM32F407VETX_FLASH.ld}" valueType="string"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.systemcalls.1962065764" name="System calls" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.systemcalls" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.systemcalls.value.minimalimplementation" valueType="enumerated"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.cref.258799709" name="Add symbol cross reference table to map file (-Wl,--cref)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.cref" useByScannerDiscovery="false" value="false" valueType="boolean"/>
+								<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.verbose.720620576" name="Verbose (-Wl,--verbose)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.verbose" useByScannerDiscovery="false" value="false" valueType="boolean"/>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="true" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.otherflags.1746443399" name="Other flags" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.option.otherflags" useByScannerDiscovery="false" valueType="stringList"/>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.input.1603725690" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.linker.input">
 									<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
 									<additionalInput kind="additionalinput" paths="$(LIBS)"/>
@@ -99,6 +105,9 @@
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.objcopy.symbolsrec.1329542300" name="MCU Output Converter Motorola S-rec with symbols" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.objcopy.symbolsrec"/>
 						</toolChain>
 					</folderInfo>
+					<fileInfo id="com.st.stm32cube.ide.mcu.gnu.managedbuild.config.exe.debug.1652594594.1362154686" name="application.c" rcbsApplicability="disable" resourcePath="app/application.c" toolsToInvoke="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.954718294.1426855840">
+						<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.954718294.1426855840" name="MCU GCC Compiler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.954718294"/>
+					</fileInfo>
 					<folderInfo id="com.st.stm32cube.ide.mcu.gnu.managedbuild.config.exe.debug.1652594594.1247500854" name="/" resourcePath="lib">
 						<toolChain id="com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.exe.debug.1812794617" name="MCU ARM GCC" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.toolchain.exe.debug" unusedChildren="">
 							<option id="com.st.stm32cube.ide.mcu.option.internal.toolchain.type.1720703955.1442910858" name="Internal Toolchain Type" superClass="com.st.stm32cube.ide.mcu.option.internal.toolchain.type.1720703955"/>
@@ -137,7 +146,7 @@
 						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Middlewares"/>
 						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Src"/>
 						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Startup"/>
-						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="app"/>
+						<entry excluding="application.c" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="app"/>
 						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="lib"/>
 					</sourceEntries>
 				</configuration>
@@ -180,7 +189,9 @@
 								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols.151564892" name="Define symbols (-D)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols" useByScannerDiscovery="false" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="USE_HAL_DRIVER"/>
 									<listOptionValue builtIn="false" value="USE_FULL_LL_DRIVER"/>
+									<listOptionValue builtIn="false" value="DEBUG"/>
 									<listOptionValue builtIn="false" value="STM32F407xx"/>
+									<listOptionValue builtIn="false" value="HAVE_CONFIG"/>
 								</option>
 								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.includepaths.941145715" name="Include paths (-I)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.includepaths" useByScannerDiscovery="false" valueType="includePath">
 									<listOptionValue builtIn="false" value="../Inc"/>
@@ -211,7 +222,9 @@
 								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.definedsymbols.575681641" name="Define symbols (-D)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.option.definedsymbols" useByScannerDiscovery="false" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="USE_HAL_DRIVER"/>
 									<listOptionValue builtIn="false" value="USE_FULL_LL_DRIVER"/>
+									<listOptionValue builtIn="false" value="DEBUG"/>
 									<listOptionValue builtIn="false" value="STM32F407xx"/>
+									<listOptionValue builtIn="false" value="HAVE_CONFIG"/>
 								</option>
 								<inputType id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.input.cpp.687772733" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.cpp.compiler.input.cpp"/>
 							</tool>
@@ -298,7 +311,7 @@
 				</extensions>
 			</storageModule>
 			<storageModule moduleId="cdtBuildSystem" version="4.0.0">
-				<configuration buildProperties="" description="" id="0.1999792219.1199955544" name="make" optionalBuildProperties="" parent="org.eclipse.cdt.build.core.prefbase.cfg">
+				<configuration artifactName="${ProjName}" buildProperties="" description="" id="0.1999792219.1199955544" name="make" optionalBuildProperties="" parent="org.eclipse.cdt.build.core.prefbase.cfg">
 					<folderInfo id="0.1999792219.1199955544." name="/" resourcePath="">
 						<toolChain id="org.eclipse.cdt.build.core.prefbase.toolchain.332727936" name="No ToolChain" resourceTypeBasedDiscovery="false" superClass="org.eclipse.cdt.build.core.prefbase.toolchain">
 							<targetPlatform id="org.eclipse.cdt.build.core.prefbase.toolchain.332727936.1076407313" name=""/>
@@ -326,6 +339,9 @@
 	<storageModule moduleId="org.eclipse.cdt.core.LanguageSettingsProviders"/>
 	<storageModule moduleId="org.eclipse.cdt.make.core.buildtargets"/>
 	<storageModule moduleId="refreshScope" versionNumber="2">
+		<configuration configurationName="make">
+			<resource resourceType="PROJECT" workspacePath="/f407ve_hs_uart"/>
+		</configuration>
 		<configuration configurationName="Debug">
 			<resource resourceType="PROJECT" workspacePath="/f407ve_hs_uart"/>
 		</configuration>
diff --git a/Makefile b/Makefile
index 22dade5..852b748 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@ TARGET = f407ve_hs_uart
 DEBUG = 1
 # optimization
 OPT = -Og
-CXXSTD = -std=c++17
+CXXSTD = -std=c++14
 
 #######################################
 # paths
diff --git a/Src/stm32f4xx_it.c b/Src/stm32f4xx_it.c
index d9f556c..2c1b1cd 100644
--- a/Src/stm32f4xx_it.c
+++ b/Src/stm32f4xx_it.c
@@ -29,6 +29,7 @@
 #include "memcpy_dma.h"
 #include "globals.h"
 #include "diag.h"
+#include "ll_testbed.h"
 
 /* USER CODE END Includes */
 
@@ -214,7 +215,7 @@ void SysTick_Handler(void)
 void DMA1_Stream1_IRQHandler(void)
 {
   /* USER CODE BEGIN DMA1_Stream1_IRQn 0 */
-  HandleUsartRxDmaIrq(&g_uartStatuses[USART3_OFFSET]);
+  _HandleUsartRxDmaIrq(USART3_OFFSET);
   /* USER CODE END DMA1_Stream1_IRQn 0 */
   
   /* USER CODE BEGIN DMA1_Stream1_IRQn 1 */
@@ -242,7 +243,7 @@ void DMA1_Stream2_IRQHandler(void)
 void DMA1_Stream3_IRQHandler(void)
 {
   /* USER CODE BEGIN DMA1_Stream3_IRQn 0 */
-  HandleUsartTxDmaIrq(&g_uartStatuses[USART3_OFFSET]);
+  _HandleUsartTxDmaIrq(USART3_OFFSET);
   /* USER CODE END DMA1_Stream3_IRQn 0 */
   
   /* USER CODE BEGIN DMA1_Stream3_IRQn 1 */
@@ -270,7 +271,7 @@ void DMA1_Stream4_IRQHandler(void)
 void DMA1_Stream5_IRQHandler(void)
 {
   /* USER CODE BEGIN DMA1_Stream5_IRQn 0 */
-  HandleUsartRxDmaIrq(&g_uartStatuses[USART2_OFFSET]);
+  _HandleUsartRxDmaIrq(USART2_OFFSET);
   /* USER CODE END DMA1_Stream5_IRQn 0 */
   
   /* USER CODE BEGIN DMA1_Stream5_IRQn 1 */
@@ -284,7 +285,7 @@ void DMA1_Stream5_IRQHandler(void)
 void DMA1_Stream6_IRQHandler(void)
 {
   /* USER CODE BEGIN DMA1_Stream6_IRQn 0 */
-  HandleUsartTxDmaIrq(&g_uartStatuses[USART2_OFFSET]);
+  _HandleUsartTxDmaIrq(USART2_OFFSET);
   /* USER CODE END DMA1_Stream6_IRQn 0 */
   
   /* USER CODE BEGIN DMA1_Stream6_IRQn 1 */
@@ -324,7 +325,7 @@ void SPI2_IRQHandler(void)
 void USART1_IRQHandler(void)
 {
   /* USER CODE BEGIN USART1_IRQn 0 */
-  HandleUsartIrq(&g_uartStatuses[USART1_OFFSET]);
+  _HandleUsartIrq(USART1_OFFSET);
   /* USER CODE END USART1_IRQn 0 */
   /* USER CODE BEGIN USART1_IRQn 1 */
 
@@ -337,7 +338,7 @@ void USART1_IRQHandler(void)
 void USART2_IRQHandler(void)
 {
   /* USER CODE BEGIN USART2_IRQn 0 */
-  HandleUsartIrq(&g_uartStatuses[USART2_OFFSET]);
+  _HandleUsartIrq(USART2_OFFSET);
   /* USER CODE END USART2_IRQn 0 */
   /* USER CODE BEGIN USART2_IRQn 1 */
 
@@ -350,7 +351,7 @@ void USART2_IRQHandler(void)
 void USART3_IRQHandler(void)
 {
   /* USER CODE BEGIN USART3_IRQn 0 */
-  HandleUsartIrq(&g_uartStatuses[USART3_OFFSET]);
+  _HandleUsartIrq(USART3_OFFSET);
   /* USER CODE END USART3_IRQn 0 */
   /* USER CODE BEGIN USART3_IRQn 1 */
 
@@ -390,7 +391,7 @@ void DMA2_Stream0_IRQHandler(void)
 void DMA2_Stream1_IRQHandler(void)
 {
   /* USER CODE BEGIN DMA2_Stream1_IRQn 0 */
-  HandleUsartRxDmaIrq(&g_uartStatuses[USART6_OFFSET]);
+  _HandleUsartRxDmaIrq(USART6_OFFSET);
   /* USER CODE END DMA2_Stream1_IRQn 0 */
   
   /* USER CODE BEGIN DMA2_Stream1_IRQn 1 */
@@ -404,7 +405,7 @@ void DMA2_Stream1_IRQHandler(void)
 void DMA2_Stream2_IRQHandler(void)
 {
   /* USER CODE BEGIN DMA2_Stream2_IRQn 0 */
-  HandleUsartRxDmaIrq(&g_uartStatuses[USART1_OFFSET]);
+  _HandleUsartRxDmaIrq(USART1_OFFSET);
   /* USER CODE END DMA2_Stream2_IRQn 0 */
   
   /* USER CODE BEGIN DMA2_Stream2_IRQn 1 */
@@ -433,11 +434,11 @@ void DMA2_Stream3_IRQHandler(void)
 void DMA2_Stream4_IRQHandler(void)
 {
   /* USER CODE BEGIN DMA2_Stream4_IRQn 0 */
-  HandleCrcDmaIrq(&g_crcStatus);
+  //HandleCrcDmaIrq(&g_crcStatus);
   /* USER CODE END DMA2_Stream4_IRQn 0 */
   
   /* USER CODE BEGIN DMA2_Stream4_IRQn 1 */
-
+  _HandleCrcDmaIrq();
   /* USER CODE END DMA2_Stream4_IRQn 1 */
 }
 
@@ -461,7 +462,7 @@ void DMA2_Stream5_IRQHandler(void)
 void DMA2_Stream6_IRQHandler(void)
 {
   /* USER CODE BEGIN DMA2_Stream6_IRQn 0 */
-  HandleUsartTxDmaIrq(&g_uartStatuses[USART6_OFFSET]);
+  _HandleUsartTxDmaIrq(USART6_OFFSET);
   /* USER CODE END DMA2_Stream6_IRQn 0 */
   
   /* USER CODE BEGIN DMA2_Stream6_IRQn 1 */
@@ -475,7 +476,7 @@ void DMA2_Stream6_IRQHandler(void)
 void DMA2_Stream7_IRQHandler(void)
 {
   /* USER CODE BEGIN DMA2_Stream7_IRQn 0 */
-  HandleUsartTxDmaIrq(&g_uartStatuses[USART1_OFFSET]);
+  _HandleUsartTxDmaIrq(USART1_OFFSET);
   /* USER CODE END DMA2_Stream7_IRQn 0 */
   
   /* USER CODE BEGIN DMA2_Stream7_IRQn 1 */
@@ -489,7 +490,7 @@ void DMA2_Stream7_IRQHandler(void)
 void USART6_IRQHandler(void)
 {
   /* USER CODE BEGIN USART6_IRQn 0 */
-  HandleUsartIrq(&g_uartStatuses[USART6_OFFSET]);
+  _HandleUsartIrq(USART6_OFFSET);
   /* USER CODE END USART6_IRQn 0 */
   /* USER CODE BEGIN USART6_IRQn 1 */
 
diff --git a/app/ll_testbed.cpp b/app/ll_testbed.cpp
new file mode 100644
index 0000000..2525f5d
--- /dev/null
+++ b/app/ll_testbed.cpp
@@ -0,0 +1,149 @@
+/*
+ * ll_testbed.cpp
+ *
+ *  Created on: Oct 28, 2019
+ *      Author: abody
+ */
+#include <string.h>
+#include <stdlib.h>
+#include "ll_hsusart.h"
+#include "ll_crchandler.h"
+#include "ll_testbed.h"
+#include "main.h"
+extern "C" {
+	#include "globals.h"
+	#include "strutil.h"
+}
+
+#define PACKAGE_DELAY_MS 0
+#define STATS_DELAY_MS 1000
+
+f4ll::LL_CrcHandler	*g_crc = nullptr;
+
+f4ll::LL_HsUsart *g_usarts[4];
+
+extern "C" void _HandleCrcDmaIrq(void)
+{
+	f4ll::LL_CrcHandler::Instance().DmaTransferCompleted();
+}
+
+extern "C" void _HandleUsartIrq(int offset)
+{
+		f4ll::LL_HsUsart::HandleUsartIrq(g_usarts[offset]);
+}
+
+extern "C" void _HandleUsartRxDmaIrq(int offset)
+{
+		f4ll::LL_HsUsart::HandleRxDmaIrq(g_usarts[offset]);
+}
+
+extern "C" void _HandleUsartTxDmaIrq(int offset)
+{
+		f4ll::LL_HsUsart::HandleTxDmaIrq(g_usarts[offset]);
+}
+
+#define ADDINFO(b,s,u) \
+	b += strcpy_ex(b,s); \
+	b += uitodec(b,u);
+
+void _PrintStats(char *buffer, uint8_t id, f4ll::LL_HsUsart &handler, USART_TypeDef *usart, DMAINFO* dmaInfo)
+{
+	char ids[] = " : ";
+	char *bs = buffer;
+
+	f4ll::LL_HsUsart::Stats const & stats(handler.GetStats());
+
+	ids[0] = id + '0';
+	buffer += strcpy_ex(buffer, ids);
+	ADDINFO(buffer, " s: ", stats.sent);
+	ADDINFO(buffer, " r: ", stats.rcvd);
+	ADDINFO(buffer, " sk: ", stats.skiped);
+	ADDINFO(buffer, " or: ", stats.overrun);
+	ADDINFO(buffer, " he: ", stats.hdrError);
+//	buffer += strcpy_ex(buffer,",0x");
+//	buffer += uitohex(buffer, stats.lastErrHdr, 8);
+	ADDINFO(buffer, " pe: ", stats.payloadErrror);
+	buffer += strcpy_ex(buffer,",0x");
+	buffer += uitohex(buffer, stats.pep1, 8);
+	buffer += strcpy_ex(buffer,",0x");
+	buffer += uitohex(buffer, stats.pep2, 8);
+	ADDINFO(buffer, " de: ", stats.dmaError);
+	ADDINFO(buffer, " pmh: ", stats.premature_hdr);
+	ADDINFO(buffer, " pmp: ", stats.premature_payload);
+	buffer += strcpy_ex(buffer, "\r\n");
+
+	SetupTransmit(usart, dmaInfo->dma, dmaInfo->stream, bs, buffer - bs + 1);
+}
+
+
+
+extern "C" void MainLoop()
+{
+	uint8_t const text2Send[]  __attribute__((aligned(4))) =
+			"Megszentsegtelenithetetlensegeskedeseitekert\r\n"
+			"--------------------------------------------\r\n\0\0\0";
+
+	f4ll::LL_CrcHandler::Init(DMA2, LL_DMA_STREAM_4);
+
+	f4ll::LL_CrcHandler::TSlot<2> slt;
+	f4ll::LL_HsUsart u1{USART1, DMA2, LL_DMA_STREAM_2, LL_DMA_STREAM_7};
+	f4ll::LL_HsUsart u2{ USART2, DMA1, LL_DMA_STREAM_5, LL_DMA_STREAM_6 };
+	f4ll::LL_HsUsart u3{ USART3, DMA1, LL_DMA_STREAM_1, LL_DMA_STREAM_3 };
+	f4ll::LL_HsUsart u6{ USART6, DMA2, LL_DMA_STREAM_1, LL_DMA_STREAM_6 };
+
+	f4ll::LL_HsUsart * usarts[] = { & u1, &u2, &u3, &u6 };
+	for(unsigned int i=0; i < sizeof(usarts) / sizeof(usarts[0]); ++i)
+		g_usarts[i] = usarts[i];
+
+	uint32_t lastStatsTick = 0;
+	uint32_t prevSentTick = 0;
+	uint8_t	statId = 0;
+
+	uint32_t	tmp = sizeof(text2Send) - 1;
+	uint32_t	randmask = 0x80000000;
+	do
+		if(randmask & tmp)
+			break;
+	while((randmask = randmask >> 1));
+	randmask -= 1;
+
+	InitDmaInfo(&g_ConsoleTxDmaInfo, CONSOLE_DMA_ENGINE, CONSOLE_TX_DMA_STREAM);
+	LL_DMA_EnableIT_TC(g_ConsoleTxDmaInfo.dma, g_ConsoleTxDmaInfo.stream);
+
+	lastStatsTick = HAL_GetTick();
+
+	for(auto u : usarts)
+		u->SetupReceive();
+
+	for(;;) {
+		uint32_t tick = HAL_GetTick();
+		bool send = PACKAGE_DELAY_MS ? (tick - prevSentTick > PACKAGE_DELAY_MS) : 1;
+
+		if(send)
+			prevSentTick += PACKAGE_DELAY_MS;
+
+		for(auto u : usarts) {
+			if(!u->IsTxBusy() && send) {
+				//DIAG_ENTER_BUSY();
+				u->PostPacket(text2Send, sizeof(text2Send) - 1 - (rand() & randmask));
+				//DIAG_EXIT_BUSY();
+			}
+			for(uint16_t rIdx = 0; rIdx < 2; ++rIdx)
+				if(u->IsRxBusy((bool)rIdx) || u->IsRxFailed(rIdx)) {
+					u->RxProcessed((bool)rIdx);
+				}
+		}
+		if(tick - lastStatsTick > STATS_DELAY_MS) {
+			_PrintStats((char*)g_statsBuf, statId, *usarts[statId], UART4, &g_ConsoleTxDmaInfo);
+			lastStatsTick += STATS_DELAY_MS;
+			++statId;
+			if(statId >= USARTCOUNT)
+				statId = 0;
+		}
+		uint32_t ein = LL_GPIO_ReadInputPort(KEY1_GPIO_Port);
+		if(!(ein & KEY1_Pin)) {
+			void (*fptr)(void) = (void (*)(void))(void*)0xa0000000;
+			fptr();
+		}
+	}
+}
diff --git a/app/ll_testbed.h b/app/ll_testbed.h
new file mode 100644
index 0000000..1ce486a
--- /dev/null
+++ b/app/ll_testbed.h
@@ -0,0 +1,27 @@
+/*
+ * ll_testbed.h
+ *
+ *  Created on: Oct 31, 2019
+ *      Author: compi
+ */
+
+#ifndef LL_TESTBED_H_
+#define LL_TESTBED_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void _HandleCrcDmaIrq(void);
+void _HandleUsartIrq(int offset);
+void _HandleUsartRxDmaIrq(int offset);
+void _HandleUsartTxDmaIrq(int offset);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+
+
+#endif /* LL_TESTBED_H_ */
diff --git a/lib/StaticList.h b/lib/StaticList.h
new file mode 100644
index 0000000..b0800cd
--- /dev/null
+++ b/lib/StaticList.h
@@ -0,0 +1,15 @@
+/*
+ * StaticList.h
+ *
+ *  Created on: Oct 29, 2019
+ *      Author: abody
+ */
+
+#ifndef STATICLIST_H_
+#define STATICLIST_H_
+
+
+
+
+
+#endif /* STATICLIST_H_ */
diff --git a/lib/ll_crchandler.cpp b/lib/ll_crchandler.cpp
new file mode 100644
index 0000000..9ccb8b3
--- /dev/null
+++ b/lib/ll_crchandler.cpp
@@ -0,0 +1,156 @@
+/*
+ * ll_crchandler.cpp
+ *
+ *  Created on: Oct 26, 2019
+ *      Author: compi
+ */
+#include "ll_crchandler.h"
+
+namespace f4ll {
+
+LL_CrcHandler::LL_CrcHandler(DMA_TypeDef *dma, uint32_t stream)
+: m_dma(dma, stream)
+{
+	LL_DMA_EnableIT_TC(dma, stream);
+	LL_DMA_EnableIT_TE(dma, stream);
+	LL_DMA_SetM2MDstAddress(dma, stream, (uint32_t)&CRC->DR);
+}
+
+
+void LL_CrcHandler::AttachSlot(Slot &slot)
+{
+	for(unsigned int i = 0; i < slot.m_taskCount; ++i ) {
+		auto &task(slot.m_tasks[i]);
+		task.m_address = nullptr;
+		task.m_wordCount = 0;
+		task.m_callback = nullptr;
+		task.m_callbackParam = 0;
+	}
+	slot.m_next = m_firstSlot;
+	uint32_t prim = __get_PRIMASK();
+	__disable_irq();
+	m_firstSlot = &slot;
+	__set_PRIMASK(prim);
+}
+
+
+bool LL_CrcHandler::Enqueue(Slot &slot, uint8_t prio, void const *address, uint16_t len, ICallback *cb, uintptr_t cbParam)
+{
+	uint32_t prim = __get_PRIMASK();
+	bool immediate;
+
+	// TODO: do we need sanity check here? (is slot attached, is prio in range, etc...?)
+
+	while(IsActive(slot,prio));
+	__disable_irq();
+	immediate = m_activeSlot == nullptr;
+	slot.m_tasks[prio].m_address = (!immediate) ? address : nullptr;
+	slot.m_tasks[prio].m_wordCount = (len+3)/4;
+	slot.m_tasks[prio].m_callback = cb;
+	slot.m_tasks[prio].m_callbackParam = cbParam;
+	if(immediate) {
+		m_activeSlot = &slot;
+		m_activePrio = prio;
+	}
+	__set_PRIMASK(prim);
+
+	if(immediate) {
+		CRC->CR = 1;
+		LL_DMA_SetM2MSrcAddress(m_dma.GetDma(), m_dma.GetStream(), (uint32_t)address);
+		LL_DMA_SetDataLength(m_dma.GetDma(), m_dma.GetStream(), (len+3)/4);
+		LL_DMA_EnableStream(m_dma.GetDma(), m_dma.GetStream());
+	}
+	return immediate;
+}
+
+bool LL_CrcHandler::IsActive(Slot &slot, uint8_t prio) const
+{
+	return prio < slot.m_taskCount && slot.m_tasks[prio].m_wordCount != 0;
+}
+
+bool LL_CrcHandler::IsQueued(Slot &slot, uint8_t prio) const
+{
+	return prio < slot.m_taskCount && slot.m_tasks[prio].m_address != nullptr;
+}
+
+bool LL_CrcHandler::IsRunning(Slot &slot, uint8_t prio) const
+{
+	return prio < slot.m_taskCount && slot.m_tasks[prio].m_wordCount && ! slot.m_tasks[prio].m_address;
+}
+
+void LL_CrcHandler::DmaTransferCompleted(void)
+{
+	if(* m_dma.GetIsReg() & m_dma.GetTcMask()) {	// DMA transfer complete
+		* m_dma.GetIcfReg() = m_dma.GetTcMask();
+		LL_DMA_DisableStream(m_dma.GetDma(), m_dma.GetStream());
+		if(m_activeSlot) {
+			if(m_activeSlot->m_tasks[m_activePrio].m_callback)
+				m_activeSlot->m_tasks[m_activePrio].m_callback->CrcSucceeded(m_activeSlot->m_tasks[m_activePrio].m_callbackParam, CRC->DR, m_activePrio);
+			else if(m_activeSlot->m_tasks[m_activePrio].m_callbackParam)
+				*reinterpret_cast<uint32_t*>(m_activeSlot->m_tasks[m_activePrio].m_callbackParam) = CRC->DR;
+		}
+	}
+	else if(*m_dma.GetIsReg() & m_dma.GetTeMask()) {	// DMA transfer error
+		*m_dma.GetIcfReg() = m_dma.GetTeMask();
+		LL_DMA_DisableStream(m_dma.GetDma(), m_dma.GetStream());
+		if(m_activeSlot) {
+			if(m_activeSlot->m_tasks[m_activePrio].m_callback)
+				m_activeSlot->m_tasks[m_activePrio].m_callback->CrcFailed(m_activeSlot->m_tasks[m_activePrio].m_callbackParam, CRC->DR, m_activePrio);
+			else if(m_activeSlot->m_tasks[m_activePrio].m_callbackParam)
+				*reinterpret_cast<uint32_t*>(m_activeSlot->m_tasks[m_activePrio].m_callbackParam) = -1;
+		}
+	}
+	m_activeSlot->m_tasks[m_activePrio].m_callback = nullptr;
+	m_activeSlot->m_tasks[m_activePrio].m_callbackParam = 0;
+	m_activeSlot->m_tasks[m_activePrio].m_wordCount = 0;
+	StartNextTask();
+}
+
+
+void LL_CrcHandler::StartNextTask(void)
+{
+	bool stillMore;
+	int index = 0;
+	do {
+		Slot *slot = m_firstSlot;
+		stillMore = false;
+		while(slot) {
+			if(index < slot->m_taskCount) {
+				if(slot->m_tasks[index].m_address) {
+					m_activeSlot = slot;
+					m_activePrio = index;
+					CRC->CR = 1;
+					LL_DMA_SetM2MSrcAddress(m_dma.GetDma(), m_dma.GetStream(), reinterpret_cast<uint32_t>(slot->m_tasks[index].m_address));
+					LL_DMA_SetDataLength(m_dma.GetDma(), m_dma.GetStream(), slot->m_tasks[index].m_wordCount);
+					LL_DMA_EnableStream(m_dma.GetDma(), m_dma.GetStream());
+					slot->m_tasks[index].m_address = nullptr;	// marking as started
+					return;
+				}
+				if(index + 1 < slot->m_taskCount)
+					stillMore = true;
+			}
+			slot = slot->m_next;
+		}
+		++index;
+	} while(stillMore);
+	m_activeSlot = nullptr;
+}
+
+
+void LL_CrcHandler::WaitResults(Slot &slot, uint8_t prio) const
+{
+	while(IsQueued(slot, prio));
+	while(IsActive(slot, prio));
+}
+
+
+uint32_t LL_CrcHandler::Compute(
+		Slot &slot, uint8_t prio, void const *address, uint16_t len)
+{
+	uint32_t result;
+	Enqueue(slot, prio, address, len, nullptr, reinterpret_cast<uintptr_t>(&result));
+	while(IsActive(slot, prio));
+	return result;
+}
+
+}	// namespace f4ll
diff --git a/lib/ll_crchandler.h b/lib/ll_crchandler.h
new file mode 100644
index 0000000..103bf10
--- /dev/null
+++ b/lib/ll_crchandler.h
@@ -0,0 +1,87 @@
+/*
+ * ll_crchandler.h
+ *
+ *  Created on: Oct 26, 2019
+ *      Author: compi
+ */
+
+#ifndef LL_CRCHANDLER_H_
+#define LL_CRCHANDLER_H_
+#include <inttypes.h>
+#include <platform/dma_ll.h>
+#include "ll_dmahelper.h"
+#include "singleton.h"
+
+extern "C" void _HandleCrcDmaIrq(void);
+
+namespace f4ll {
+
+class LL_CrcHandler : public Singleton<LL_CrcHandler>
+{
+	friend class Singleton<LL_CrcHandler>;
+
+public:
+	struct ICallback
+	{
+		virtual void CrcSucceeded(uintptr_t callbackParam, uint32_t crc, int prio) = 0;
+		virtual void CrcFailed(uintptr_t callbackParam, uint32_t crc, int prio) = 0;
+	};
+
+	class Slot
+	{
+		friend class LL_CrcHandler;
+	public:
+		struct CrcTask {
+			void const * volatile    m_address;			// changed to nullptr when execution starts
+			uint16_t volatile        m_wordCount;
+			LL_CrcHandler::ICallback *m_callback;
+			uintptr_t                 m_callbackParam;
+		};
+
+	private:
+		Slot    *m_next = nullptr;
+		uint8_t m_taskCount;
+		CrcTask m_tasks[1];
+
+	protected:
+		Slot(unsigned int taskCount) : m_taskCount(taskCount) {}
+		Slot() = delete;
+		Slot(Slot const &other) = delete;
+	};
+
+	// DON't try this at home! we "extend" LL_CrcHandler::m_tasks this way
+	template <uint8_t n> class TSlot : public Slot
+	{
+	public:
+		TSlot() : Slot(n) {}
+	private:
+		TSlot::CrcTask _m_tasks[n-1];
+	};
+
+	void     AttachSlot(Slot &slot);
+	bool     Enqueue(Slot &slot, uint8_t prio, void const *address, uint16_t len, ICallback *cb, uintptr_t cbParam);
+	uint32_t Compute(Slot &slot, uint8_t prio, void const *address, uint16_t len);
+
+	bool     IsActive(Slot &slot, uint8_t prio) const;
+	bool     IsQueued(Slot &slot, uint8_t prio) const;
+	bool     IsRunning(Slot &slot, uint8_t prio) const;
+
+
+private:
+	LL_CrcHandler(DMA_TypeDef *dma, uint32_t stream);
+
+	friend void ::_HandleCrcDmaIrq(void);
+	void DmaTransferCompleted(void);
+	void StartNextTask(void);
+	void WaitResults(Slot &slot, uint8_t prio) const;
+
+	LL_DmaHelper        m_dma;
+	Slot * volatile     m_firstSlot = nullptr;
+	Slot * volatile     m_activeSlot = nullptr;
+	int	volatile        m_activePrio;
+};
+
+
+}	//	namespace f4ll
+
+#endif /* LL_CRCHANDLER_H_ */
diff --git a/lib/ll_dmahelper.cpp b/lib/ll_dmahelper.cpp
index 24ea882..c6e24e5 100644
--- a/lib/ll_dmahelper.cpp
+++ b/lib/ll_dmahelper.cpp
@@ -1,5 +1,5 @@
 /*
- * ll_dmahelper.cpp
+q * ll_dmahelper.cpp
  *
  *  Created on: Oct 25, 2019
  *      Author: abody
@@ -9,11 +9,11 @@
 
 namespace f4ll {
 
-static const uint32_t m_FEMasks[8]  = {DMA_LISR_FEIF0,  DMA_LISR_FEIF1,  DMA_LISR_FEIF2,  DMA_LISR_FEIF3,  DMA_HISR_FEIF4,  DMA_HISR_FEIF5,  DMA_HISR_FEIF6,  DMA_HISR_FEIF7};
-static const uint32_t m_DMEMasks[8] = {DMA_LISR_DMEIF0, DMA_LISR_DMEIF1, DMA_LISR_DMEIF2, DMA_LISR_DMEIF3, DMA_HISR_DMEIF4, DMA_HISR_DMEIF5, DMA_HISR_DMEIF6, DMA_HISR_DMEIF7};
-static const uint32_t m_TEMasks[8]  = {DMA_LISR_TEIF0,  DMA_LISR_TEIF1,  DMA_LISR_TEIF2,  DMA_LISR_TEIF3,  DMA_HISR_TEIF4,  DMA_HISR_TEIF5,  DMA_HISR_TEIF6,  DMA_HISR_TEIF7};
-static const uint32_t m_HTMasks[8]  = {DMA_LISR_HTIF0,  DMA_LISR_HTIF1,  DMA_LISR_HTIF2,  DMA_LISR_HTIF3,  DMA_HISR_HTIF4,  DMA_HISR_HTIF5,  DMA_HISR_HTIF6,  DMA_HISR_HTIF7};
-static const uint32_t m_TCMasks[8]  = {DMA_LISR_TCIF0,  DMA_LISR_TCIF1,  DMA_LISR_TCIF2,  DMA_LISR_TCIF3,  DMA_HISR_TCIF4,  DMA_HISR_TCIF5,  DMA_HISR_TCIF6,  DMA_HISR_TCIF7};
+const uint32_t LL_DmaHelper::m_FEMasks[8]  = {DMA_LISR_FEIF0,  DMA_LISR_FEIF1,  DMA_LISR_FEIF2,  DMA_LISR_FEIF3,  DMA_HISR_FEIF4,  DMA_HISR_FEIF5,  DMA_HISR_FEIF6,  DMA_HISR_FEIF7};
+const uint32_t LL_DmaHelper::m_DMEMasks[8] = {DMA_LISR_DMEIF0, DMA_LISR_DMEIF1, DMA_LISR_DMEIF2, DMA_LISR_DMEIF3, DMA_HISR_DMEIF4, DMA_HISR_DMEIF5, DMA_HISR_DMEIF6, DMA_HISR_DMEIF7};
+const uint32_t LL_DmaHelper::m_TEMasks[8]  = {DMA_LISR_TEIF0,  DMA_LISR_TEIF1,  DMA_LISR_TEIF2,  DMA_LISR_TEIF3,  DMA_HISR_TEIF4,  DMA_HISR_TEIF5,  DMA_HISR_TEIF6,  DMA_HISR_TEIF7};
+const uint32_t LL_DmaHelper::m_HTMasks[8]  = {DMA_LISR_HTIF0,  DMA_LISR_HTIF1,  DMA_LISR_HTIF2,  DMA_LISR_HTIF3,  DMA_HISR_HTIF4,  DMA_HISR_HTIF5,  DMA_HISR_HTIF6,  DMA_HISR_HTIF7};
+const uint32_t LL_DmaHelper::m_TCMasks[8]  = {DMA_LISR_TCIF0,  DMA_LISR_TCIF1,  DMA_LISR_TCIF2,  DMA_LISR_TCIF3,  DMA_HISR_TCIF4,  DMA_HISR_TCIF5,  DMA_HISR_TCIF6,  DMA_HISR_TCIF7};
 
 LL_DmaHelper::LL_DmaHelper(DMA_TypeDef *dma, uint32_t stream)
 : m_dma(dma)
diff --git a/lib/ll_dmahelper.h b/lib/ll_dmahelper.h
index eaf7bbf..d26094f 100644
--- a/lib/ll_dmahelper.h
+++ b/lib/ll_dmahelper.h
@@ -16,17 +16,17 @@ namespace f4ll {
 class LL_DmaHelper {
 public:
 	LL_DmaHelper(DMA_TypeDef *dma, uint32_t stream);
-	~LL_DmaHelper() = delete;
+	LL_DmaHelper(LL_DmaHelper const &base) = default;
 
-	inline DMA_TypeDef* GetDMA()          { return m_dma; }
-	inline uint32_t GetStream()           { return m_stream; }
-	inline volatile uint32_t* GetIsReg()  { return m_isReg; }
-	inline volatile uint32_t* GetIcfReg() { return m_ifcReg; }
-	inline uint32_t GetFeMask()           { return m_FEMasks[m_stream]; }
-	inline uint32_t GetDmeMask()          { return m_DMEMasks[m_stream]; }
-	inline uint32_t GetTeMask()           { return m_TEMasks[m_stream]; }
-	inline uint32_t GetHtMask()           { return m_HTMasks[m_stream]; }
-	inline uint32_t GetTcMask()           { return m_TCMasks[m_stream]; }
+	inline DMA_TypeDef* GetDma() const          { return m_dma; }
+	inline uint32_t GetStream() const           { return m_stream; }
+	inline volatile uint32_t* GetIsReg() const 	{ return m_isReg; }
+	inline volatile uint32_t* GetIcfReg() const { return m_ifcReg; }
+	inline uint32_t GetFeMask() const           { return m_FEMasks[m_stream]; }
+	inline uint32_t GetDmeMask() const          { return m_DMEMasks[m_stream]; }
+	inline uint32_t GetTeMask() const           { return m_TEMasks[m_stream]; }
+	inline uint32_t GetHtMask() const           { return m_HTMasks[m_stream]; }
+	inline uint32_t GetTcMask() const           { return m_TCMasks[m_stream]; }
 
 private:
 	DMA_TypeDef			*m_dma;
@@ -34,11 +34,11 @@ private:
 	volatile uint32_t	*m_isReg;
 	volatile uint32_t	*m_ifcReg;
 
-	static const uint32_t	m_FEMasks[8];
-	static const uint32_t	m_DMEMasks[8];
-	static const uint32_t	m_TEMasks[8];
-	static const uint32_t	m_HTMasks[8];
-	static const uint32_t	m_TCMasks[8];
+	static const uint32_t m_FEMasks[8];
+	static const uint32_t m_DMEMasks[8];
+	static const uint32_t m_TEMasks[8];
+	static const uint32_t m_HTMasks[8];
+	static const uint32_t m_TCMasks[8];
 };
 
 } /* namespace f4ll */
diff --git a/lib/ll_hsusart.cpp b/lib/ll_hsusart.cpp
new file mode 100644
index 0000000..6ed6e9b
--- /dev/null
+++ b/lib/ll_hsusart.cpp
@@ -0,0 +1,250 @@
+/*
+ * ll_hsusart_impl.h
+ *
+ *  Created on: Oct 29, 2019
+ *      Author: abody
+ */
+#include <string.h>
+#include "ll_hsusart.h"
+
+namespace f4ll {
+
+template<typename T> static inline T RoundUpTo4(T input)
+{
+	return (input + 3) & (((T)-1) - 3);
+}
+
+LL_HsUsart::LL_HsUsart(USART_TypeDef *usart, DMA_TypeDef *dma, uint32_t streamRx, uint32_t streamTx)
+: m_usart(usart)
+, m_rxDma(dma, streamRx)
+, m_txDma(dma, streamTx)
+{
+	LL_CrcHandler::Instance().AttachSlot(m_crcSlot);
+	LL_DMA_EnableIT_TC(dma, streamRx);
+	LL_DMA_EnableIT_TE(dma, streamRx);
+	LL_DMA_EnableIT_TC(dma, streamTx);
+	LL_DMA_EnableIT_TE(dma, streamTx);
+	LL_USART_EnableIT_IDLE(usart);
+
+	memset(&m_stats, 0, sizeof(m_stats));
+}
+
+
+uint8_t *LL_HsUsart::GetTxPacketBuffer(void)
+{
+	return m_txBuffer.packet.payload;
+}
+
+
+USART_TypeDef* LL_HsUsart::GetUsart(void)
+{
+	return m_usart;
+}
+
+
+LL_HsUsart::Stats const & LL_HsUsart::GetStats(void)
+{
+	return m_stats;
+}
+
+
+bool LL_HsUsart::IsTxBusy()
+{
+	return m_txBuffer.busy;
+}
+
+
+bool LL_HsUsart::IsTxFailed()
+{
+	return m_txBuffer.error;
+}
+
+
+bool LL_HsUsart::IsRxBusy(bool second)
+{
+	return m_rxBuffers[second].busy;
+}
+
+
+bool LL_HsUsart::IsRxFailed(bool second)
+{
+	return m_rxBuffers[second].error;
+
+}
+
+void LL_HsUsart::RxProcessed(bool second)
+{
+	m_rxBuffers[second].busy = false;
+	m_rxBuffers[second].error = false;
+}
+
+void LL_HsUsart::SetCallback(IHsUsartCallback *callback, uintptr_t callbackParam)
+{
+	m_userCallback = callback;
+	m_userCallbackParam = callbackParam;
+}
+
+void LL_HsUsart::BuildHeader(Packet &packet, uint8_t serialNo, uint8_t length)
+{
+	uint8_t hash = STARTMARKER;
+
+	packet.header.startByte = STARTMARKER;
+	packet.header.serial = serialNo;
+	hash ^= serialNo;
+	packet.header.payloadLength = length;
+	hash ^= length;
+	packet.header.hash = hash;
+}
+
+
+bool LL_HsUsart::CheckHeader(PacketHeader &header)
+{
+	return header.startByte == STARTMARKER && (header.startByte ^ header.serial ^ header.payloadLength) == header.hash;
+}
+
+
+void LL_HsUsart::PostPacket(uint8_t const *payload, uint8_t length, bool waitForCrcQueue)
+{
+	uint16_t payloadLength = RoundUpTo4((uint16_t)length);
+
+	BuildHeader(m_txBuffer.packet, m_txSerialNo++, length);
+	if(payload)
+		memcpy(m_txBuffer.packet.payload, payload, length);
+	m_txBuffer.requestedLength = sizeof(m_txBuffer.packet.header) + payloadLength + sizeof(uint32_t);
+	m_txBuffer.busy = true;
+	m_txBuffer.error = false;
+
+	LL_CrcHandler::Instance().Enqueue(m_crcSlot, 0, &m_txBuffer.packet, sizeof(PacketHeader) + payloadLength,
+			nullptr, reinterpret_cast<uintptr_t>(m_txBuffer.packet.payload + payloadLength));
+
+	while(waitForCrcQueue && LL_CrcHandler::Instance().IsQueued(m_crcSlot, 0));
+
+	LL_DMA_ConfigAddresses(m_txDma.GetDma(), m_txDma.GetStream(), reinterpret_cast<uint32_t>(&m_txBuffer.packet),
+			LL_USART_DMA_GetRegAddr(m_usart), LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
+	LL_DMA_SetDataLength(m_txDma.GetDma(), m_txDma.GetStream(), m_txBuffer.requestedLength);
+	LL_USART_EnableDMAReq_TX(m_usart);
+	LL_DMA_EnableStream(m_txDma.GetDma(), m_txDma.GetStream());
+
+	++m_stats.sent;
+}
+
+
+void LL_HsUsart::SetupReceive()
+{
+	int packetIndex = m_rxBufferSelector;
+
+	LL_DMA_ConfigAddresses(m_rxDma.GetDma(), m_rxDma.GetStream(), LL_USART_DMA_GetRegAddr(m_usart),
+			reinterpret_cast<uint32_t>(&m_rxBuffers[packetIndex]), LL_DMA_DIRECTION_PERIPH_TO_MEMORY);
+	m_rxBuffers[packetIndex].requestedLength = sizeof(m_rxBuffers[packetIndex].packet);
+	LL_DMA_SetDataLength(m_rxDma.GetDma(), m_rxDma.GetStream(), m_rxBuffers[packetIndex].requestedLength);	// payload already have extra room for hash
+	LL_USART_EnableDMAReq_RX(m_usart);
+	LL_USART_ClearFlag_ORE(m_usart);
+	LL_DMA_EnableStream(m_rxDma.GetDma(), m_rxDma.GetStream());
+}
+
+
+void LL_HsUsart::UsartIrq(void)
+{
+	if(LL_USART_IsActiveFlag_IDLE(m_usart) && LL_USART_IsEnabledIT_IDLE(m_usart)) {	//	receiver idle
+		LL_USART_ClearFlag_IDLE(m_usart);
+		uint16_t rcvdLen = m_rxBuffers[m_rxBufferSelector].requestedLength - LL_DMA_GetDataLength(m_rxDma.GetDma(), m_rxDma.GetStream());
+		if(rcvdLen >= sizeof(PacketHeader)) {
+			if(CheckHeader(m_rxBuffers[m_rxBufferSelector].packet.header)) {
+				if(rcvdLen >= sizeof(PacketHeader) +
+						RoundUpTo4((uint16_t)m_rxBuffers[m_rxBufferSelector].packet.header.payloadLength)
+						+ sizeof(uint32_t))
+					LL_DMA_DisableStream(m_rxDma.GetDma(), m_rxDma.GetStream());
+				else
+					++m_stats.premature_payload;
+			} else {
+				m_rxBuffers[m_rxBufferSelector].error = 1;
+				LL_DMA_DisableStream(m_rxDma.GetDma(), m_rxDma.GetStream());
+			}
+		} else
+			++m_stats.premature_hdr;
+	}
+	else if(LL_USART_IsActiveFlag_TC(m_usart) && LL_USART_IsEnabledIT_TC(m_usart)) {	// transmission complete
+		LL_USART_DisableIT_TC(m_usart);
+		LL_USART_DisableDirectionTx(m_usart);	// enforcing an idle frame
+		LL_USART_EnableDirectionTx(m_usart);
+		m_txBuffer.busy = 0;
+	}
+}
+
+
+void LL_HsUsart::RxDmaIrq()
+{
+	++m_stats.rcvd;
+	if(*m_rxDma.GetIsReg() & m_rxDma.GetTcMask()) {
+		*m_rxDma.GetIcfReg() = m_rxDma.GetTcMask();
+		if(CheckHeader(m_rxBuffers[m_rxBufferSelector].packet.header))
+			LL_CrcHandler::Instance().Enqueue(m_crcSlot, 1,
+					&m_rxBuffers[m_rxBufferSelector].packet,
+					sizeof(PacketHeader) + RoundUpTo4((uint16_t)m_rxBuffers[m_rxBufferSelector].packet.header.payloadLength),
+					this, m_rxBufferSelector);
+		else {
+			++m_stats.hdrError;
+			m_rxBuffers[m_rxBufferSelector].error = true;
+		}
+	} else if(*m_rxDma.GetIsReg() & m_rxDma.GetTeMask()) {
+		*m_rxDma.GetIcfReg() = m_rxDma.GetTeMask();
+		m_rxBuffers[m_rxBufferSelector].error = 1;
+		++m_stats.dmaError;
+	}
+
+	m_rxBufferSelector = !m_rxBufferSelector;
+
+	if(m_rxBuffers[m_rxBufferSelector].busy)
+		++m_stats.overrun;
+	SetupReceive();
+}
+
+
+void LL_HsUsart::CrcSucceeded(uintptr_t callbackParam, uint32_t crc, int prio)
+{
+	Buffer &buf(m_rxBuffers[static_cast<int>(callbackParam)]);
+
+	buf.busy = 1;
+	if(*(uint32_t*) (buf.packet.payload + RoundUpTo4((uint16_t)buf.packet.header.payloadLength)) != crc) {
+		buf.error = 1;
+		buf.errorInfo = crc;
+		++m_stats.payloadErrror;
+	}
+	if(m_userCallback)
+		buf.busy = !m_userCallback->PacketReceived(this, m_userCallbackParam, buf.packet);
+}
+
+
+void LL_HsUsart::CrcFailed(uintptr_t callbackParam, uint32_t crc, int prio)
+{
+	Buffer &buf(m_rxBuffers[static_cast<int>(callbackParam)]);
+	buf.busy = buf.error = true;
+	buf.errorInfo = 0;
+	++m_stats.payloadErrror;
+	if(m_userCallback)
+		buf.busy = !m_userCallback->PacketReceived(this, m_userCallbackParam, buf.packet);
+}
+
+
+void LL_HsUsart::TxDmaIrq()
+{
+	if(*m_txDma.GetIsReg() & m_txDma.GetTcMask()) {	// DMA transfer complete
+		*m_txDma.GetIcfReg() = m_txDma.GetTcMask();
+		LL_USART_EnableIT_TC(m_usart);
+		LL_DMA_DisableStream(m_txDma.GetDma(), m_txDma.GetStream());
+	}
+	else if(*m_txDma.GetIsReg() & m_txDma.GetTeMask()) {
+		*m_txDma.GetIcfReg() = m_txDma.GetTeMask();
+		m_txBuffer.error = 1;
+		++m_stats.dmaError;
+	}
+	if(*m_txDma.GetIsReg() & m_txDma.GetFeMask())
+		*m_txDma.GetIcfReg() = m_txDma.GetFeMask();
+	if(*m_txDma.GetIsReg() & m_txDma.GetHtMask())
+		*m_txDma.GetIcfReg() = m_txDma.GetHtMask();
+	if(*m_txDma.GetIsReg() & m_txDma.GetDmeMask())
+		*m_txDma.GetIcfReg() = m_txDma.GetDmeMask();
+}
+
+
+}	//	namespace f4ll
diff --git a/lib/ll_hsusart.h b/lib/ll_hsusart.h
new file mode 100644
index 0000000..17ec483
--- /dev/null
+++ b/lib/ll_hsusart.h
@@ -0,0 +1,112 @@
+/*
+ * ll_HsUsart.h
+ *
+ *  Created on: Oct 29, 2019
+ *      Author: abody
+ */
+
+#ifndef LL_HSUSART_H_
+#define LL_HSUSART_H_
+#include <platform/usart_ll.h>
+#include <ll_crchandler.h>
+
+namespace f4ll {
+
+struct DMAINFO;
+
+class LL_HsUsart : public LL_CrcHandler::ICallback
+{
+public:
+	LL_HsUsart(USART_TypeDef *usart, DMA_TypeDef *dma, uint32_t stream_rx, uint32_t stream_tx);
+
+	struct PacketHeader {	// !!! size should be multiple of 4 !!!
+		uint8_t startByte;
+		uint8_t serial;
+		uint8_t payloadLength;
+		uint8_t hash;
+	};
+
+	struct Packet {
+		PacketHeader header;
+		uint8_t      payload[256+sizeof(uint32_t)];	// extra room for crc32
+	} __attribute__((aligned));
+
+	struct Stats {
+		uint32_t overrun;
+		uint32_t hdrError;
+		uint32_t payloadErrror;
+		uint32_t pep1, pep2;
+		uint32_t dmaError;
+		uint32_t rcvd;
+		uint32_t premature_hdr;
+		uint32_t premature_payload;
+		uint32_t sent;
+		uint32_t skiped;
+	};
+
+	struct IHsUsartCallback {
+		virtual bool PacketReceived(LL_HsUsart *caller, uintptr_t userParam, Packet const &packet) = 0;
+	};
+
+	//LL_CRCHandler::ICallback interface functions
+	virtual void CrcSucceeded(uintptr_t callbackParam, uint32_t crc, int prio);
+	virtual void CrcFailed(uintptr_t callbackParam, uint32_t crc, int prio);
+
+	void PostPacket(uint8_t const *payload, uint8_t length, bool waitForCrcQueue = true);
+	void SetupReceive(void);
+
+	void RxProcessed(bool second);
+	uint8_t* GetTxPacketBuffer(void);
+	USART_TypeDef* GetUsart(void);
+	Stats const & GetStats();
+	bool IsTxBusy();
+	bool IsTxFailed();
+	bool IsRxBusy(bool second);
+	bool IsRxFailed(bool second);
+
+	void SetCallback(IHsUsartCallback* callback, uintptr_t callbackParam);
+
+	static inline void HandleUsartIrq(LL_HsUsart *obj) {
+		obj->UsartIrq();
+	}
+	static inline void HandleRxDmaIrq(LL_HsUsart *obj) {
+		obj->RxDmaIrq();
+	}
+	static inline void HandleTxDmaIrq(LL_HsUsart *obj) {
+		obj->TxDmaIrq();
+	}
+private:
+	void BuildHeader(Packet &packet, uint8_t serialNo, uint8_t length);
+	bool CheckHeader(PacketHeader &header);
+	void UsartIrq(void);
+	void RxDmaIrq(void);
+	void TxDmaIrq(void);
+
+	struct Buffer {
+		Packet packet;
+		//transfer area ends here
+		volatile bool busy = 0;
+		volatile bool error = 0;
+		uint16_t requestedLength = 0;
+		uint32_t errorInfo = 0;
+	};
+
+	static const uint8_t STARTMARKER = 0x95;
+
+	USART_TypeDef *m_usart;
+	LL_DmaHelper   m_rxDma;
+	LL_DmaHelper   m_txDma;
+	uint8_t        m_rxSerialNo = -1;
+	uint8_t        m_txSerialNo = -1;
+	Stats          m_stats;
+	bool           m_rxBufferSelector = false;
+
+	LL_CrcHandler::TSlot<2> m_crcSlot;
+	IHsUsartCallback       *m_userCallback = nullptr;
+	uintptr_t               m_userCallbackParam = 0;
+	Buffer                  m_txBuffer;
+	Buffer                  m_rxBuffers[2];
+};
+
+}
+#endif /* LL_HSUSART_H_ */
diff --git a/lib/singleton.h b/lib/singleton.h
new file mode 100644
index 0000000..8cd9886
--- /dev/null
+++ b/lib/singleton.h
@@ -0,0 +1,27 @@
+#ifndef SINGLETON_H_
+#define SINGLETON_H_
+
+#include <utility>
+
+template<typename T> class Singleton {
+public:
+    static T &Instance() { return *m_instance; }
+    template<typename ... Args>
+    static T &Init(Args &&... args)
+    {
+        static T instance{ std::forward<Args>(args)... };
+        if(!m_instance)
+        	m_instance = &instance;
+        return instance;
+    }
+
+protected:
+    Singleton() = default;
+    Singleton(const Singleton &) = delete;
+    Singleton &operator=(const Singleton &) = delete;
+    static T *m_instance;
+};
+
+template<typename T> T* Singleton<T>::m_instance = nullptr;
+
+#endif /* SINGLETON_H_ */
diff --git a/lib/usart_handler.c b/lib/usart_handler.c
index 1a5232a..fcf5dc0 100644
--- a/lib/usart_handler.c
+++ b/lib/usart_handler.c
@@ -86,7 +86,8 @@ static inline void BuildHeader(struct usart_buffer *buffer, uint8_t serial, uint
 	buffer->packet.header.hash = hash;
 }
 
-static inline uint8_t CheckHeader(USARTPACKET *packet) {
+static inline uint8_t CheckHeader(USARTPACKET *packet)
+{
 	return packet->header.startByte == STARTMARKER && (packet->header.startByte ^ packet->header.serial ^ packet->header.payloadLength) == packet->header.hash;
 }
 
@@ -166,7 +167,7 @@ void RxCrcComputedCallback(void *callbackParm, uint32_t calculatedCrc, uint8_t s
 	struct usart_buffer *ub = (struct usart_buffer*) callbackParm;
 	if(!success)
 		ub->error = 1;
-	else if(*(uint32_t*) (ub->packet.payload + RoundUpTo4(ub->packet.header.payloadLength + 1)))
+	else if(*(uint32_t*) (ub->packet.payload + RoundUpTo4(ub->packet.header.payloadLength + 1)) == calculatedCrc)
 		ub->busy = 1;
 	else {
 		ub->error = ub->busy = 1;