diff --git a/lesson-19/tm4c123-ccs-gnu/.ccsproject b/lesson-19/tm4c123-ccs-gnu/.ccsproject
index 255f3f5..d086cbe 100644
--- a/lesson-19/tm4c123-ccs-gnu/.ccsproject
+++ b/lesson-19/tm4c123-ccs-gnu/.ccsproject
@@ -14,4 +14,6 @@
 	<templateProperties value="id=com.ti.common.project.core.emptyProjectTemplate_gnu_arm,"/>
 	<filesToOpen value=""/>
 	<isTargetManual value="true"/>
+	<activeTargetConfiguration value="targetConfigs/Tiva TM4C123GH6PM.ccxml"/>
+	<sourceLookupPath value=""/>
 </projectOptions>
diff --git a/lesson-19/tm4c123-ccs-gnu/.clangd b/lesson-19/tm4c123-ccs-gnu/.clangd
new file mode 100644
index 0000000..8c4daa2
--- /dev/null
+++ b/lesson-19/tm4c123-ccs-gnu/.clangd
@@ -0,0 +1,11 @@
+# This is an auto-generated file - do not add it to source-control
+
+CompileFlags:
+   CompilationDatabase: Debug/.clangd
+
+Diagnostics:
+   Suppress: '*'
+
+InlayHints:
+   Enabled: No
+
diff --git a/lesson-19/tm4c123-ccs-gnu/.cproject b/lesson-19/tm4c123-ccs-gnu/.cproject
index a42b2e8..af72799 100644
--- a/lesson-19/tm4c123-ccs-gnu/.cproject
+++ b/lesson-19/tm4c123-ccs-gnu/.cproject
@@ -15,66 +15,63 @@
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-								<listOptionValue builtIn="false" value="RUNTIME_SUPPORT_LIBRARY=libc.a"/>
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+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.MAP_FILE.1340228795" name="Write a map file (-Map)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.MAP_FILE" value="${ProjName}.map" valueType="string"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__CMD_SRCS.169185704" name="Linker Command Files" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__CMD_SRCS"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__CMD2_SRCS.1355769407" name="Linker Command Files" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__CMD2_SRCS"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__GEN_CMDS.1774440783" name="Generated Linker Command Files" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__GEN_CMDS"/>
 							</tool>
-							<tool id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.hex.1606545214" name="GNU Objcopy Utility" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.hex"/>
+							<tool id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.hex.1958391901" name="GNU Objcopy Utility" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.hex"/>
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 					<sourceEntries>
@@ -84,8 +81,8 @@
 			</storageModule>
 			<storageModule moduleId="org.eclipse.cdt.core.externalSettings"/>
 		</cconfiguration>
-		<cconfiguration id="com.ti.ccstudio.buildDefinitions.TMS470.Debug.534492546.1358541448">
-			<storageModule buildSystemId="org.eclipse.cdt.managedbuilder.core.configurationDataProvider" id="com.ti.ccstudio.buildDefinitions.TMS470.Debug.534492546.1358541448" moduleId="org.eclipse.cdt.core.settings" name="Release">
+		<cconfiguration id="com.ti.ccstudio.buildDefinitions.TMS470.Debug.534492546.810751328">
+			<storageModule buildSystemId="org.eclipse.cdt.managedbuilder.core.configurationDataProvider" id="com.ti.ccstudio.buildDefinitions.TMS470.Debug.534492546.810751328" moduleId="org.eclipse.cdt.core.settings" name="Release">
 				<externalSettings/>
 				<extensions>
 					<extension id="com.ti.ccstudio.binaryparser.CoffParser" point="org.eclipse.cdt.core.BinaryParser"/>
@@ -96,73 +93,69 @@
 				</extensions>
 			</storageModule>
 			<storageModule moduleId="cdtBuildSystem" version="4.0.0">
-				<configuration artifactExtension="out" artifactName="${ProjName}" buildProperties="" cleanCommand="${CG_CLEAN_CMD}" description="" id="com.ti.ccstudio.buildDefinitions.TMS470.Debug.534492546.1358541448" name="Release" parent="com.ti.ccstudio.buildDefinitions.TMS470.Debug">
-					<folderInfo id="com.ti.ccstudio.buildDefinitions.TMS470.Debug.534492546.1358541448." name="/" resourcePath="">
-						<toolChain id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.DebugToolchain.1274683537" name="TI Build Tools" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.DebugToolchain" targetTool="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.linkerDebug.322079202">
-							<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.ti.ccstudio.buildDefinitions.core.OPT_TAGS.939183011" superClass="com.ti.ccstudio.buildDefinitions.core.OPT_TAGS" valueType="stringList">
+				<configuration artifactExtension="out" artifactName="${ProjName}" buildProperties="" cleanCommand="${CG_CLEAN_CMD}" description="" id="com.ti.ccstudio.buildDefinitions.TMS470.Debug.534492546.810751328" name="Release" parent="com.ti.ccstudio.buildDefinitions.TMS470.Debug">
+					<folderInfo id="com.ti.ccstudio.buildDefinitions.TMS470.Debug.534492546.810751328." name="/" resourcePath="">
+						<toolChain id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.DebugToolchain.2032089598" name="TI Build Tools" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.DebugToolchain" targetTool="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.linkerDebug.1834140482">
+							<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.ti.ccstudio.buildDefinitions.core.OPT_TAGS.1427217069" superClass="com.ti.ccstudio.buildDefinitions.core.OPT_TAGS" valueType="stringList">
 								<listOptionValue builtIn="false" value="DEVICE_CONFIGURATION_ID=Cortex M.TM4C123GH6PM"/>
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 								<listOptionValue builtIn="false" value="DEVICE_ENDIANNESS=little"/>
 								<listOptionValue builtIn="false" value="OUTPUT_FORMAT=ELF"/>
-								<listOptionValue builtIn="false" value="LINKER_COMMAND_FILE=tm4c123gh6pm.lds"/>
-								<listOptionValue builtIn="false" value="RUNTIME_SUPPORT_LIBRARY=libc.a"/>
+								<listOptionValue builtIn="false" value="LINKER_COMMAND_FILE=lesson.ld"/>
+								<listOptionValue builtIn="false" value="RUNTIME_SUPPORT_LIBRARY="/>
 								<listOptionValue builtIn="false" value="CCS_MBS_VERSION=6.1.3"/>
 								<listOptionValue builtIn="false" value="PRODUCTS="/>
 								<listOptionValue builtIn="false" value="PRODUCT_MACRO_IMPORTS={}"/>
 								<listOptionValue builtIn="false" value="OUTPUT_TYPE=executable"/>
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-							<targetPlatform id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.targetPlatformDebug.1075475419" name="Platform" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.targetPlatformDebug"/>
-							<builder buildPath="${BuildDirectory}" id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.builderDebug.104218780" keepEnvironmentInBuildfile="false" name="GNU Make" parallelBuildOn="true" parallelizationNumber="optimal" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.builderDebug"/>
-							<tool id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.compilerDebug.1458418475" name="GNU Compiler" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.compilerDebug">
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-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.MARCH.13770180" name="Target architecture (-march)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.MARCH" value="armv7e-m" valueType="string"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.MCPU.348070063" name="Target CPU (-mcpu)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.MCPU" value="cortex-m4" valueType="string"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.MFPU.664015265" name="Target floating point hardware/format (-mfpu)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.MFPU" value="fpv4-sp-d16" valueType="string"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.MFLOAT_ABI.1189825504" name="Use floating point hardware (-mfloat-abi)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.MFLOAT_ABI" value="hard" valueType="string"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.FUNCTION_SECTIONS.858176305" name="Place each function into its own section (-ffunction-sections)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.FUNCTION_SECTIONS" value="true" valueType="boolean"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.DATA_SECTIONS.2010596652" name="Place data items into their own section (-fdata-sections)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.DATA_SECTIONS" value="true" valueType="boolean"/>
-								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.DEFINE.174706292" name="Define symbols (-D)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.DEFINE" valueType="definedSymbols">
-									<listOptionValue builtIn="false" value="NDEBUG"/>
+							<option id="com.ti.ccstudio.buildDefinitions.core.OPT_CODEGEN_VERSION.2121688273" name="Compiler version" superClass="com.ti.ccstudio.buildDefinitions.core.OPT_CODEGEN_VERSION" value="GNU_10.3.1:FSF" valueType="string"/>
+							<targetPlatform id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.targetPlatformDebug.915429473" name="Platform" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.targetPlatformDebug"/>
+							<builder buildPath="${BuildDirectory}" command="make" enableAutoBuild="false" id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.builderDebug.962681180" keepEnvironmentInBuildfile="false" name="GNU Make" stopOnErr="true" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.builderDebug"/>
+							<tool id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.compilerDebug.1004228496" name="GNU Compiler" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.compilerDebug">
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.CODE_STATE.1527654847" name="Code state" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.CODE_STATE" value="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.CODE_STATE.THUMB" valueType="enumerated"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.MARCH.1059231045" name="Target architecture (-march)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.MARCH" value="armv7e-m" valueType="string"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.MCPU.808538050" name="Target CPU (-mcpu)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.MCPU" value="cortex-m4" valueType="string"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.MFPU.966379586" name="Target floating point hardware/format (-mfpu)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.MFPU" value="fpv4-sp-d16" valueType="string"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.MFLOAT_ABI.51426566" name="Use floating point hardware (-mfloat-abi)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.MFLOAT_ABI" value="hard" valueType="string"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.FUNCTION_SECTIONS.1956357048" name="Place each function into its own section (-ffunction-sections)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.FUNCTION_SECTIONS" value="true" valueType="boolean"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.DATA_SECTIONS.1959096653" name="Place data items into their own section (-fdata-sections)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.DATA_SECTIONS" value="true" valueType="boolean"/>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.DEFINE.1754661695" name="Define symbols (-D)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.DEFINE" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="TM4C123GH6PM"/>
 								</option>
-								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.INCLUDE_PATH.1598515651" name="Include paths (-I)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.INCLUDE_PATH" valueType="includePath">
-									<listOptionValue builtIn="false" value="${PROJECT_LOC}/../CMSIS/Include"/>
-									<listOptionValue builtIn="false" value="${PROJECT_LOC}/../ek-tm4c123gxl"/>
-									<listOptionValue builtIn="false" value="${CG_TOOL_INCLUDE_PATH}"/>
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-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.DEBUG.399837833" name="Generate debug information (-g)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.DEBUG" value="true" valueType="boolean"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.DWARF_VERSION.2035847261" name="Generate debug information in DWARF version (-gdwarf-)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.DWARF_VERSION" value="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.DWARF_VERSION.3" valueType="enumerated"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.STRICT_DWARF.878635770" name="Do not emit DWARF additions beyond selected version (-gstrict-dwarf)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.STRICT_DWARF" value="true" valueType="boolean"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.SPECS.1334955429" name="Override built-in specs with the contents of the specified file (-specs)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.SPECS" value="&quot;nosys.specs&quot;" valueType="string"/>
-								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.ASM_SPECIFIC_FLAGS.1044790501" name="Miscellaneous assembly source specific flags" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compilerID.ASM_SPECIFIC_FLAGS" valueType="stringList">
-									<listOptionValue builtIn="false" value="-x assembler-with-cpp"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.STD_C.1861849789" name="C Language standard (-std)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.STD_C" value="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.STD_C.C11" valueType="enumerated"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.STD_CPP.237074492" name="C++ Language standard (-std)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.STD_CPP" value="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.STD_CPP.CPP11" valueType="enumerated"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.FEXCEPTIONS.1585944504" name="Enable exception handling" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.FEXCEPTIONS" value="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.FEXCEPTIONS.OFF" valueType="enumerated"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.FRTTI.403160713" name="Generate run-time type descriptor information [C++ source only]" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.FRTTI" value="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.FRTTI.OFF" valueType="enumerated"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.NO_THREADSAFE_STATICS.1696010004" name="Omit code for thread-safe initialization of local statics (-fno-threadsafe-statics) [C++ source only]" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.NO_THREADSAFE_STATICS" value="true" valueType="boolean"/>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.INCLUDE_PATH.920636965" name="Include paths (-I)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.INCLUDE_PATH" valueType="includePath">
+									<listOptionValue builtIn="false" value="${PROJECT_ROOT}"/>
+									<listOptionValue builtIn="false" value="${PROJECT_ROOT}/../CMSIS/Include"/>
+									<listOptionValue builtIn="false" value="${PROJECT_ROOT}/../ek-tm4c123gxl"/>
 								</option>
-								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compiler.inputType__C_SRCS.434600335" name="C Sources" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compiler.inputType__C_SRCS"/>
-								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compiler.inputType__CPP_SRCS.186984178" name="C++ Sources" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compiler.inputType__CPP_SRCS"/>
-								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compiler.inputType__ASM_SRCS.601262926" name="Assembly Sources" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compiler.inputType__ASM_SRCS"/>
-								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compiler.inputType__ASM2_SRCS.1249903357" name="Assembly Sources" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.compiler.inputType__ASM2_SRCS"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.OPT_LEVEL.529573991" name="Optimization Level" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.OPT_LEVEL" value="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.OPT_LEVEL.0" valueType="enumerated"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.DEBUG.1041473760" name="Generate debug information (-g)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compilerID.DEBUG" value="false" valueType="boolean"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compiler.inputType__C_SRCS.520420830" name="C Sources" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compiler.inputType__C_SRCS"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compiler.inputType__CPP_SRCS.1796131048" name="C++ Sources" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compiler.inputType__CPP_SRCS"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compiler.inputType__ASM_SRCS.420465547" name="Assembly Sources" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compiler.inputType__ASM_SRCS"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compiler.inputType__ASM2_SRCS.1679408592" name="Assembly Sources" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.compiler.inputType__ASM2_SRCS"/>
 							</tool>
-							<tool id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.linkerDebug.322079202" name="GNU Linker" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exe.linkerDebug">
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.linkerID.OUTPUT_FILE.900206437" name="Output file (-o)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.linkerID.OUTPUT_FILE" value="${ProjName}.out" valueType="string"/>
-								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.linkerID.MAP_FILE.2083386586" name="Write a map file (-Map)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.linkerID.MAP_FILE" value="${ProjName}.map" valueType="string"/>
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-								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exeLinker.inputType__CMD2_SRCS.1270143918" name="Linker Command Files" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exeLinker.inputType__CMD2_SRCS"/>
-								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exeLinker.inputType__GEN_CMDS.1640657192" name="Generated Linker Command Files" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.exeLinker.inputType__GEN_CMDS"/>
+							<tool id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.linkerDebug.1834140482" name="GNU Linker" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exe.linkerDebug">
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.OUTPUT_FILE.163541256" name="Output file (-o)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.OUTPUT_FILE" value="${ProjName}.out" valueType="string"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.NOSTARTFILES.572359633" name="Do not use the standard system startup files when linking (-nostartfiles)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.NOSTARTFILES" value="true" valueType="boolean"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.NODEFAULTLIBS.1953314998" name="Do not use the standard system libraries when linking (-nodefaultlibs)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.NODEFAULTLIBS" value="true" valueType="boolean"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.NOSTDLIB.2011553149" name="Do not use the standard system startup files or libraries when linking (-nostdlib)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.NOSTDLIB" value="true" valueType="boolean"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.STATIC.1768759049" name="Do not link with the shared libraries (-static)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.STATIC" value="true" valueType="boolean"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.GC_SECTIONS.1201907254" name="Remove unused sections (--gc-sections)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.GC_SECTIONS" value="true" valueType="boolean"/>
+								<option id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.MAP_FILE.1231878954" name="Write a map file (-Map)" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.linkerID.MAP_FILE" value="${ProjName}.map" valueType="string"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__CMD_SRCS.1560263397" name="Linker Command Files" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__CMD_SRCS"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__CMD2_SRCS.405272750" name="Linker Command Files" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__CMD2_SRCS"/>
+								<inputType id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__GEN_CMDS.594790150" name="Generated Linker Command Files" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.exeLinker.inputType__GEN_CMDS"/>
 							</tool>
-							<tool id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.hex.1972434728" name="GNU Objcopy Utility" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_9.0.hex"/>
+							<tool id="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.hex.791829896" name="GNU Objcopy Utility" superClass="com.ti.ccstudio.buildDefinitions.TMS470_GNU_10.0.hex"/>
 						</toolChain>
 					</folderInfo>
 					<sourceEntries>
-						<entry excluding="ek-tm4c123gxl/qutest|ek-tm4c123gxl/iar|ek-tm4c123gxl/arm" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
+						<entry excluding="ek-tm4c123gxl/iar|ek-tm4c123gxl/qutest|ek-tm4c123gxl/arm" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
 					</sourceEntries>
 				</configuration>
 			</storageModule>
diff --git a/lesson-19/tm4c123-ccs-gnu/.project b/lesson-19/tm4c123-ccs-gnu/.project
index fc7381e..cb48e05 100644
--- a/lesson-19/tm4c123-ccs-gnu/.project
+++ b/lesson-19/tm4c123-ccs-gnu/.project
@@ -7,6 +7,7 @@
 	<buildSpec>
 		<buildCommand>
 			<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
+			<triggers>clean,full,incremental,</triggers>
 			<arguments>
 			</arguments>
 		</buildCommand>