0.37

Added lesson-37: State Machines Part-3

lesson-21/main.c

@@ -27,23 +27,22 @@ int main() {
             ON_STATE
         } state = INITIAL;
         static uint32_t start;
-        uint32_t now = BSP_tickCtr(); /* buffered value of the tickCtr */
         switch (state) {
             case INITIAL:
-                start = now;
+                start = BSP_tickCtr();
                 state = OFF_STATE; /* initial transition */
                 break;
             case OFF_STATE:
-                if ((now - start) > BSP_TICKS_PER_SEC * 3U / 4U) {
+                if ((BSP_tickCtr() - start) > BSP_TICKS_PER_SEC * 3U / 4U) {
                     BSP_ledGreenOn();
-                    start = now;
+                    start = BSP_tickCtr();
                     state = ON_STATE; /* state transition */
                 }
                 break;
             case ON_STATE:
-                if ((now - start) > BSP_TICKS_PER_SEC / 4U) {
+                if ((BSP_tickCtr() - start) > BSP_TICKS_PER_SEC / 4U) {
                     BSP_ledGreenOff();
-                    start = now;
+                    start = BSP_tickCtr();
                     state = OFF_STATE; /* state transition */
                 }
                 break;

lesson-35/lesson.uvoptx

@@ -117,10 +117,6 @@
         <pMon>BIN\lmidk-agdi.dll</pMon>
       </DebugOpt>
       <TargetDriverDllRegistry>
-        <SetRegEntry>
-          <Number>0</Number>
-          <Key>DLGUARM</Key>
-        </SetRegEntry>
         <SetRegEntry>
           <Number>0</Number>
           <Key>ARMRTXEVENTFLAGS</Key>

lesson-37/bsp.c

@@ -0,0 +1,94 @@
+/* Board Support Package (BSP) for the EK-TM4C123GXL board */
+#include <stdint.h>  /* Standard integers. WG14/N843 C99 Standard */
+
+#include "bsp.h"
+#include "TM4C123GH6PM.h" /* the TM4C MCU Peripheral Access Layer (TI) */
+
+/* on-board LEDs */
+#define LED_RED   (1U << 1)
+#define LED_BLUE  (1U << 2)
+#define LED_GREEN (1U << 3)
+
+/* Buttons on the board */
+#define BTN_SW1   (1U << 4)
+
+static uint32_t volatile l_tickCtr;
+
+void SysTick_Handler(void) {
+    ++l_tickCtr;
+}
+
+void BSP_init(void) {
+    SYSCTL->RCGCGPIO  |= (1U << 5); /* enable Run mode for GPIOF */
+    SYSCTL->GPIOHBCTL |= (1U << 5); /* enable AHB for GPIOF */
+    GPIOF_AHB->DIR |= (LED_RED | LED_BLUE | LED_GREEN);
+    GPIOF_AHB->DEN |= (LED_RED | LED_BLUE | LED_GREEN);
+
+    /* configure switch SW1 */
+    GPIOF_AHB->DIR &= ~BTN_SW1; /* input */
+    GPIOF_AHB->DEN |= BTN_SW1; /* digital enable */
+    GPIOF_AHB->PUR |= BTN_SW1; /* pull-up resistor enable */
+    
+    SystemCoreClockUpdate();
+    SysTick_Config(SystemCoreClock / BSP_TICKS_PER_SEC);
+
+    __enable_irq();
+}
+
+uint32_t BSP_tickCtr(void) {
+    uint32_t tickCtr;
+
+    __disable_irq();
+    tickCtr = l_tickCtr;
+    __enable_irq();
+
+    return tickCtr;
+}
+
+uint8_t BSP_SW1(void) {
+    uint32_t sw1;
+
+    __disable_irq();
+    sw1 = GPIOF_AHB->DATA_Bits[BTN_SW1];
+    __enable_irq();
+
+    return (sw1 != 0U) ? 1U : 0U;
+}
+
+void BSP_delay(uint32_t ticks) {
+    uint32_t start = BSP_tickCtr();
+    while ((BSP_tickCtr() - start) < ticks) {
+    }
+}
+
+void BSP_ledRedOn(void) {
+    GPIOF_AHB->DATA_Bits[LED_RED] = LED_RED;
+}
+
+void BSP_ledRedOff(void) {
+    GPIOF_AHB->DATA_Bits[LED_RED] = 0U;
+}
+
+void BSP_ledBlueOn(void) {
+    GPIOF_AHB->DATA_Bits[LED_BLUE] = LED_BLUE;
+}
+
+void BSP_ledBlueOff(void) {
+    GPIOF_AHB->DATA_Bits[LED_BLUE] = 0U;
+}
+
+void BSP_ledGreenOn(void) {
+    GPIOF_AHB->DATA_Bits[LED_GREEN] = LED_GREEN;
+}
+
+void BSP_ledGreenOff(void) {
+    GPIOF_AHB->DATA_Bits[LED_GREEN] = 0U;
+}
+
+
+void Q_onAssert(char const *module, int loc) {
+    /* TBD: damage control */
+    (void)module; /* avoid the "unused parameter" compiler warning */
+    (void)loc;    /* avoid the "unused parameter" compiler warning */
+    NVIC_SystemReset();
+}

lesson-37/bsp.h

@@ -0,0 +1,27 @@
+#ifndef __BSP_H__
+#define __BSP_H__
+
+/* system clock tick [Hz] */
+#define BSP_TICKS_PER_SEC 100U
+
+void BSP_init(void);
+
+/* get the current value of the clock tick counter (returns immedately) */
+uint32_t BSP_tickCtr(void);
+
+/* get the current state of the SW1 button (1==inactive, 0==active) */
+uint8_t BSP_SW1(void);
+
+/* delay for a specified number of system clock ticks (polling) */
+void BSP_delay(uint32_t ticks);
+
+void BSP_ledRedOn(void);
+void BSP_ledRedOff(void);
+
+void BSP_ledBlueOn(void);
+void BSP_ledBlueOff(void);
+
+void BSP_ledGreenOn(void);
+void BSP_ledGreenOff(void);
+
+#endif // __BSP_H__

lesson-37/lesson.uvoptx

@@ -0,0 +1,288 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<ProjectOpt xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="project_optx.xsd">
+
+  <SchemaVersion>1.0</SchemaVersion>
+
+  <Header>### uVision Project, (C) Keil Software</Header>
+
+  <Extensions>
+    <cExt>*.c</cExt>
+    <aExt>*.s*; *.src; *.a*</aExt>
+    <oExt>*.obj; *.o</oExt>
+    <lExt>*.lib</lExt>
+    <tExt>*.txt; *.h; *.inc</tExt>
+    <pExt>*.plm</pExt>
+    <CppX>*.cpp</CppX>
+    <nMigrate>0</nMigrate>
+  </Extensions>
+
+  <DaveTm>
+    <dwLowDateTime>0</dwLowDateTime>
+    <dwHighDateTime>0</dwHighDateTime>
+  </DaveTm>
+
+  <Target>
+    <TargetName>dbg</TargetName>
+    <ToolsetNumber>0x4</ToolsetNumber>
+    <ToolsetName>ARM-ADS</ToolsetName>
+    <TargetOption>
+      <CLKADS>16000000</CLKADS>
+      <OPTTT>
+        <gFlags>1</gFlags>
+        <BeepAtEnd>1</BeepAtEnd>
+        <RunSim>0</RunSim>
+        <RunTarget>1</RunTarget>
+        <RunAbUc>0</RunAbUc>
+      </OPTTT>
+      <OPTHX>
+        <HexSelection>1</HexSelection>
+        <FlashByte>65535</FlashByte>
+        <HexRangeLowAddress>0</HexRangeLowAddress>
+        <HexRangeHighAddress>0</HexRangeHighAddress>
+        <HexOffset>0</HexOffset>
+      </OPTHX>
+      <OPTLEX>
+        <PageWidth>79</PageWidth>
+        <PageLength>66</PageLength>
+        <TabStop>8</TabStop>
+        <ListingPath>.\dbg\</ListingPath>
+      </OPTLEX>
+      <ListingPage>
+        <CreateCListing>1</CreateCListing>
+        <CreateAListing>1</CreateAListing>
+        <CreateLListing>1</CreateLListing>
+        <CreateIListing>0</CreateIListing>
+        <AsmCond>1</AsmCond>
+        <AsmSymb>1</AsmSymb>
+        <AsmXref>0</AsmXref>
+        <CCond>1</CCond>
+        <CCode>0</CCode>
+        <CListInc>0</CListInc>
+        <CSymb>0</CSymb>
+        <LinkerCodeListing>0</LinkerCodeListing>
+      </ListingPage>
+      <OPTXL>
+        <LMap>1</LMap>
+        <LComments>1</LComments>
+        <LGenerateSymbols>1</LGenerateSymbols>
+        <LLibSym>1</LLibSym>
+        <LLines>1</LLines>
+        <LLocSym>1</LLocSym>
+        <LPubSym>1</LPubSym>
+        <LXref>0</LXref>
+        <LExpSel>0</LExpSel>
+      </OPTXL>
+      <OPTFL>
+        <tvExp>1</tvExp>
+        <tvExpOptDlg>0</tvExpOptDlg>
+        <IsCurrentTarget>1</IsCurrentTarget>
+      </OPTFL>
+      <CpuCode>4</CpuCode>
+      <DebugOpt>
+        <uSim>0</uSim>
+        <uTrg>1</uTrg>
+        <sLdApp>1</sLdApp>
+        <sGomain>1</sGomain>
+        <sRbreak>1</sRbreak>
+        <sRwatch>1</sRwatch>
+        <sRmem>1</sRmem>
+        <sRfunc>1</sRfunc>
+        <sRbox>1</sRbox>
+        <tLdApp>1</tLdApp>
+        <tGomain>1</tGomain>
+        <tRbreak>1</tRbreak>
+        <tRwatch>1</tRwatch>
+        <tRmem>1</tRmem>
+        <tRfunc>0</tRfunc>
+        <tRbox>1</tRbox>
+        <tRtrace>1</tRtrace>
+        <sRSysVw>1</sRSysVw>
+        <tRSysVw>1</tRSysVw>
+        <sRunDeb>0</sRunDeb>
+        <sLrtime>0</sLrtime>
+        <bEvRecOn>1</bEvRecOn>
+        <bSchkAxf>0</bSchkAxf>
+        <bTchkAxf>0</bTchkAxf>
+        <nTsel>8</nTsel>
+        <sDll></sDll>
+        <sDllPa></sDllPa>
+        <sDlgDll></sDlgDll>
+        <sDlgPa></sDlgPa>
+        <sIfile></sIfile>
+        <tDll></tDll>
+        <tDllPa></tDllPa>
+        <tDlgDll></tDlgDll>
+        <tDlgPa></tDlgPa>
+        <tIfile></tIfile>
+        <pMon>BIN\lmidk-agdi.dll</pMon>
+      </DebugOpt>
+      <TargetDriverDllRegistry>
+        <SetRegEntry>
+          <Number>0</Number>
+          <Key>ARMRTXEVENTFLAGS</Key>
+          <Name>-L70 -Z18 -C0 -M0 -T1</Name>
+        </SetRegEntry>
+        <SetRegEntry>
+          <Number>0</Number>
+          <Key>DLGTARM</Key>
+          <Name>(1010=2641,195,3091,752,0)(1007=-1,-1,-1,-1,0)(1008=2104,174,2480,410,0)(1009=-1,-1,-1,-1,0)(1012=-1,-1,-1,-1,0)</Name>
+        </SetRegEntry>
+        <SetRegEntry>
+          <Number>0</Number>
+          <Key>ARMDBGFLAGS</Key>
+          <Name></Name>
+        </SetRegEntry>
+        <SetRegEntry>
+          <Number>0</Number>
+          <Key>lmidk-agdi</Key>
+          <Name>-U0E2006F4 -O4622 -S3 -FO29</Name>
+        </SetRegEntry>
+        <SetRegEntry>
+          <Number>0</Number>
+          <Key>UL2CM3</Key>
+          <Name>UL2CM3(-S0 -C0 -P0 -FD20000000 -FC1000 -FN1 -FF0TM4C123_256 -FS00 -FL040000 -FP0($$Device:TM4C123GH6PM$Flash\TM4C123_256.FLM))</Name>
+        </SetRegEntry>
+      </TargetDriverDllRegistry>
+      <Breakpoint/>
+      <MemoryWindow1>
+        <Mm>
+          <WinNumber>1</WinNumber>
+          <SubType>2</SubType>
+          <ItemText>0x20000480</ItemText>
+          <AccSizeX>0</AccSizeX>
+        </Mm>
+      </MemoryWindow1>
+      <Tracepoint>
+        <THDelay>0</THDelay>
+      </Tracepoint>
+      <DebugFlag>
+        <trace>0</trace>
+        <periodic>0</periodic>
+        <aLwin>1</aLwin>
+        <aCover>0</aCover>
+        <aSer1>0</aSer1>
+        <aSer2>0</aSer2>
+        <aPa>0</aPa>
+        <viewmode>1</viewmode>
+        <vrSel>0</vrSel>
+        <aSym>0</aSym>
+        <aTbox>0</aTbox>
+        <AscS1>0</AscS1>
+        <AscS2>0</AscS2>
+        <AscS3>0</AscS3>
+        <aSer3>0</aSer3>
+        <eProf>0</eProf>
+        <aLa>0</aLa>
+        <aPa1>0</aPa1>
+        <AscS4>0</AscS4>
+        <aSer4>0</aSer4>
+        <StkLoc>1</StkLoc>
+        <TrcWin>0</TrcWin>
+        <newCpu>0</newCpu>
+        <uProt>0</uProt>
+      </DebugFlag>
+      <LintExecutable></LintExecutable>
+      <LintConfigFile></LintConfigFile>
+      <bLintAuto>0</bLintAuto>
+      <bAutoGenD>0</bAutoGenD>
+      <LntExFlags>0</LntExFlags>
+      <pMisraName></pMisraName>
+      <pszMrule></pszMrule>
+      <pSingCmds></pSingCmds>
+      <pMultCmds></pMultCmds>
+      <pMisraNamep></pMisraNamep>
+      <pszMrulep></pszMrulep>
+      <pSingCmdsp></pSingCmdsp>
+      <pMultCmdsp></pMultCmdsp>
+    </TargetOption>
+  </Target>
+
+  <Group>
+    <GroupName>Applicatioin</GroupName>
+    <tvExp>1</tvExp>
+    <tvExpOptDlg>0</tvExpOptDlg>
+    <cbSel>0</cbSel>
+    <RteFlg>0</RteFlg>
+    <File>
+      <GroupNumber>1</GroupNumber>
+      <FileNumber>1</FileNumber>
+      <FileType>1</FileType>
+      <tvExp>0</tvExp>
+      <tvExpOptDlg>0</tvExpOptDlg>
+      <bDave2>0</bDave2>
+      <PathWithFileName>.\bsp.c</PathWithFileName>
+      <FilenameWithoutPath>bsp.c</FilenameWithoutPath>
+      <RteFlg>0</RteFlg>
+      <bShared>0</bShared>
+    </File>
+    <File>
+      <GroupNumber>1</GroupNumber>
+      <FileNumber>2</FileNumber>
+      <FileType>1</FileType>
+      <tvExp>0</tvExp>
+      <tvExpOptDlg>0</tvExpOptDlg>
+      <bDave2>0</bDave2>
+      <PathWithFileName>.\main.c</PathWithFileName>
+      <FilenameWithoutPath>main.c</FilenameWithoutPath>
+      <RteFlg>0</RteFlg>
+      <bShared>0</bShared>
+    </File>
+    <File>
+      <GroupNumber>1</GroupNumber>
+      <FileNumber>3</FileNumber>
+      <FileType>5</FileType>
+      <tvExp>0</tvExp>
+      <tvExpOptDlg>0</tvExpOptDlg>
+      <bDave2>0</bDave2>
+      <PathWithFileName>.\bsp.h</PathWithFileName>
+      <FilenameWithoutPath>bsp.h</FilenameWithoutPath>
+      <RteFlg>0</RteFlg>
+      <bShared>0</bShared>
+    </File>
+  </Group>
+
+  <Group>
+    <GroupName>ek-tm4c123gxl</GroupName>
+    <tvExp>1</tvExp>
+    <tvExpOptDlg>0</tvExpOptDlg>
+    <cbSel>0</cbSel>
+    <RteFlg>0</RteFlg>
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+      <GroupNumber>2</GroupNumber>
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+      <tvExp>0</tvExp>
+      <tvExpOptDlg>0</tvExpOptDlg>
+      <bDave2>0</bDave2>
+      <PathWithFileName>..\qpc\3rd_party\ek-tm4c123gxl\system_TM4C123GH6PM.c</PathWithFileName>
+      <FilenameWithoutPath>system_TM4C123GH6PM.c</FilenameWithoutPath>
+      <RteFlg>0</RteFlg>
+      <bShared>0</bShared>
+    </File>
+    <File>
+      <GroupNumber>2</GroupNumber>
+      <FileNumber>5</FileNumber>
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+      <tvExpOptDlg>0</tvExpOptDlg>
+      <bDave2>0</bDave2>
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+      <FilenameWithoutPath>startup_TM4C123GH6PM.s</FilenameWithoutPath>
+      <RteFlg>0</RteFlg>
+      <bShared>0</bShared>
+    </File>
+    <File>
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+      <tvExpOptDlg>0</tvExpOptDlg>
+      <bDave2>0</bDave2>
+      <PathWithFileName>..\qpc\3rd_party\ek-tm4c123gxl\TM4C123GH6PM.h</PathWithFileName>
+      <FilenameWithoutPath>TM4C123GH6PM.h</FilenameWithoutPath>
+      <RteFlg>0</RteFlg>
+      <bShared>0</bShared>
+    </File>
+  </Group>
+
+</ProjectOpt>

lesson-37/lesson.uvprojx

@@ -0,0 +1,432 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
+<Project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="project_projx.xsd">
+
+  <SchemaVersion>2.1</SchemaVersion>
+
+  <Header>### uVision Project, (C) Keil Software</Header>
+
+  <Targets>
+    <Target>
+      <TargetName>dbg</TargetName>
+      <ToolsetNumber>0x4</ToolsetNumber>
+      <ToolsetName>ARM-ADS</ToolsetName>
+      <pCCUsed>5060750::V5.06 update 6 (build 750)::ARMCC</pCCUsed>
+      <uAC6>0</uAC6>
+      <TargetOption>
+        <TargetCommonOption>
+          <Device>TM4C123GH6PM</Device>
+          <Vendor>Texas Instruments</Vendor>
+          <PackID>Keil.TM4C_DFP.1.1.0</PackID>
+          <PackURL>http://www.keil.com/pack/</PackURL>
+          <Cpu>IROM(0x00000000,0x040000) IRAM(0x20000000,0x008000) CPUTYPE("Cortex-M4") FPU2 CLOCK(12000000) ELITTLE</Cpu>
+          <FlashUtilSpec></FlashUtilSpec>
+          <StartupFile></StartupFile>
+          <FlashDriverDll>UL2CM3(-S0 -C0 -P0 -FD20000000 -FC1000 -FN1 -FF0TM4C123_256 -FS00 -FL040000 -FP0($$Device:TM4C123GH6PM$Flash\TM4C123_256.FLM))</FlashDriverDll>
+          <DeviceId>0</DeviceId>
+          <RegisterFile>$$Device:TM4C123GH6PM$Device\Include\TM4C123\TM4C123.h</RegisterFile>
+          <MemoryEnv></MemoryEnv>
+          <Cmp></Cmp>
+          <Asm></Asm>
+          <Linker></Linker>
+          <OHString></OHString>
+          <InfinionOptionDll></InfinionOptionDll>
+          <SLE66CMisc></SLE66CMisc>
+          <SLE66AMisc></SLE66AMisc>
+          <SLE66LinkerMisc></SLE66LinkerMisc>
+          <SFDFile>$$Device:TM4C123GH6PM$SVD\TM4C123\TM4C123GH6PM.svd</SFDFile>
+          <bCustSvd>0</bCustSvd>
+          <UseEnv>0</UseEnv>
+          <BinPath></BinPath>
+          <IncludePath></IncludePath>
+          <LibPath></LibPath>
+          <RegisterFilePath></RegisterFilePath>
+          <DBRegisterFilePath></DBRegisterFilePath>
+          <TargetStatus>
+            <Error>0</Error>
+            <ExitCodeStop>0</ExitCodeStop>
+            <ButtonStop>0</ButtonStop>
+            <NotGenerated>0</NotGenerated>
+            <InvalidFlash>1</InvalidFlash>
+          </TargetStatus>
+          <OutputDirectory>.\dbg\</OutputDirectory>
+          <OutputName>lesson</OutputName>
+          <CreateExecutable>1</CreateExecutable>
+          <CreateLib>0</CreateLib>
+          <CreateHexFile>0</CreateHexFile>
+          <DebugInformation>1</DebugInformation>
+          <BrowseInformation>1</BrowseInformation>
+          <ListingPath>.\dbg\</ListingPath>
+          <HexFormatSelection>1</HexFormatSelection>
+          <Merge32K>0</Merge32K>
+          <CreateBatchFile>0</CreateBatchFile>
+          <BeforeCompile>
+            <RunUserProg1>0</RunUserProg1>
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+          <BeforeMake>
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+            <nStopA1X>0</nStopA1X>
+            <nStopA2X>0</nStopA2X>
+          </AfterMake>
+          <SelectedForBatchBuild>1</SelectedForBatchBuild>
+          <SVCSIdString></SVCSIdString>
+        </TargetCommonOption>
+        <CommonProperty>
+          <UseCPPCompiler>0</UseCPPCompiler>
+          <RVCTCodeConst>0</RVCTCodeConst>
+          <RVCTZI>0</RVCTZI>
+          <RVCTOtherData>0</RVCTOtherData>
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+          <AssembleAssemblyFile>0</AssembleAssemblyFile>
+          <PublicsOnly>0</PublicsOnly>
+          <StopOnExitCode>3</StopOnExitCode>
+          <CustomArgument></CustomArgument>
+          <IncludeLibraryModules></IncludeLibraryModules>
+          <ComprImg>1</ComprImg>
+        </CommonProperty>
+        <DllOption>
+          <SimDllName>SARMCM3.DLL</SimDllName>
+          <SimDllArguments>  -MPU</SimDllArguments>
+          <SimDlgDll>DCM.DLL</SimDlgDll>
+          <SimDlgDllArguments>-pCM4</SimDlgDllArguments>
+          <TargetDllName>SARMCM3.DLL</TargetDllName>
+          <TargetDllArguments> -MPU</TargetDllArguments>
+          <TargetDlgDll>TCM.DLL</TargetDlgDll>
+          <TargetDlgDllArguments>-pCM4</TargetDlgDllArguments>
+        </DllOption>
+        <DebugOption>
+          <OPTHX>
+            <HexSelection>1</HexSelection>
+            <HexRangeLowAddress>0</HexRangeLowAddress>
+            <HexRangeHighAddress>0</HexRangeHighAddress>
+            <HexOffset>0</HexOffset>
+            <Oh166RecLen>16</Oh166RecLen>
+          </OPTHX>
+        </DebugOption>
+        <Utilities>
+          <Flash1>
+            <UseTargetDll>1</UseTargetDll>
+            <UseExternalTool>0</UseExternalTool>
+            <RunIndependent>0</RunIndependent>
+            <UpdateFlashBeforeDebugging>1</UpdateFlashBeforeDebugging>
+            <Capability>1</Capability>
+            <DriverSelection>4097</DriverSelection>
+          </Flash1>
+          <bUseTDR>1</bUseTDR>
+          <Flash2>BIN\UL2CM3.DLL</Flash2>
+          <Flash3></Flash3>
+          <Flash4></Flash4>
+          <pFcarmOut></pFcarmOut>
+          <pFcarmGrp></pFcarmGrp>
+          <pFcArmRoot></pFcArmRoot>
+          <FcArmLst>0</FcArmLst>
+        </Utilities>
+        <TargetArmAds>
+          <ArmAdsMisc>
+            <GenerateListings>0</GenerateListings>
+            <asHll>1</asHll>
+            <asAsm>1</asAsm>
+            <asMacX>1</asMacX>
+            <asSyms>1</asSyms>
+            <asFals>1</asFals>
+            <asDbgD>1</asDbgD>
+            <asForm>1</asForm>
+            <ldLst>0</ldLst>
+            <ldmm>1</ldmm>
+            <ldXref>1</ldXref>
+            <BigEnd>0</BigEnd>
+            <AdsALst>0</AdsALst>
+            <AdsACrf>0</AdsACrf>
+            <AdsANop>0</AdsANop>
+            <AdsANot>0</AdsANot>
+            <AdsLLst>1</AdsLLst>
+            <AdsLmap>1</AdsLmap>
+            <AdsLcgr>1</AdsLcgr>
+            <AdsLsym>1</AdsLsym>
+            <AdsLszi>1</AdsLszi>
+            <AdsLtoi>1</AdsLtoi>
+            <AdsLsun>1</AdsLsun>
+            <AdsLven>1</AdsLven>
+            <AdsLsxf>1</AdsLsxf>
+            <RvctClst>0</RvctClst>
+            <GenPPlst>0</GenPPlst>
+            <AdsCpuType>"Cortex-M4"</AdsCpuType>
+            <RvctDeviceName></RvctDeviceName>
+            <mOS>0</mOS>
+            <uocRom>0</uocRom>
+            <uocRam>0</uocRam>
+            <hadIROM>1</hadIROM>
+            <hadIRAM>1</hadIRAM>
+            <hadXRAM>0</hadXRAM>
+            <uocXRam>0</uocXRam>
+            <RvdsVP>2</RvdsVP>
+            <RvdsMve>0</RvdsMve>
+            <hadIRAM2>0</hadIRAM2>
+            <hadIROM2>0</hadIROM2>
+            <StupSel>8</StupSel>
+            <useUlib>0</useUlib>
+            <EndSel>0</EndSel>
+            <uLtcg>0</uLtcg>
+            <nSecure>0</nSecure>
+            <RoSelD>3</RoSelD>
+            <RwSelD>3</RwSelD>
+            <CodeSel>0</CodeSel>
+            <OptFeed>0</OptFeed>
+            <NoZi1>0</NoZi1>
+            <NoZi2>0</NoZi2>
+            <NoZi3>0</NoZi3>
+            <NoZi4>0</NoZi4>
+            <NoZi5>0</NoZi5>
+            <Ro1Chk>0</Ro1Chk>
+            <Ro2Chk>0</Ro2Chk>
+            <Ro3Chk>0</Ro3Chk>
+            <Ir1Chk>1</Ir1Chk>
+            <Ir2Chk>0</Ir2Chk>
+            <Ra1Chk>0</Ra1Chk>
+            <Ra2Chk>0</Ra2Chk>
+            <Ra3Chk>0</Ra3Chk>
+            <Im1Chk>1</Im1Chk>
+            <Im2Chk>0</Im2Chk>
+            <OnChipMemories>
+              <Ocm1>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </Ocm1>
+              <Ocm2>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </Ocm2>
+              <Ocm3>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </Ocm3>
+              <Ocm4>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </Ocm4>
+              <Ocm5>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </Ocm5>
+              <Ocm6>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </Ocm6>
+              <IRAM>
+                <Type>0</Type>
+                <StartAddress>0x20000000</StartAddress>
+                <Size>0x8000</Size>
+              </IRAM>
+              <IROM>
+                <Type>1</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x40000</Size>
+              </IROM>
+              <XRAM>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </XRAM>
+              <OCR_RVCT1>
+                <Type>1</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </OCR_RVCT1>
+              <OCR_RVCT2>
+                <Type>1</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </OCR_RVCT2>
+              <OCR_RVCT3>
+                <Type>1</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </OCR_RVCT3>
+              <OCR_RVCT4>
+                <Type>1</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x40000</Size>
+              </OCR_RVCT4>
+              <OCR_RVCT5>
+                <Type>1</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </OCR_RVCT5>
+              <OCR_RVCT6>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </OCR_RVCT6>
+              <OCR_RVCT7>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </OCR_RVCT7>
+              <OCR_RVCT8>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </OCR_RVCT8>
+              <OCR_RVCT9>
+                <Type>0</Type>
+                <StartAddress>0x20000000</StartAddress>
+                <Size>0x8000</Size>
+              </OCR_RVCT9>
+              <OCR_RVCT10>
+                <Type>0</Type>
+                <StartAddress>0x0</StartAddress>
+                <Size>0x0</Size>
+              </OCR_RVCT10>
+            </OnChipMemories>
+            <RvctStartVector></RvctStartVector>
+          </ArmAdsMisc>
+          <Cads>
+            <interw>0</interw>
+            <Optim>1</Optim>
+            <oTime>0</oTime>
+            <SplitLS>0</SplitLS>
+            <OneElfS>1</OneElfS>
+            <Strict>0</Strict>
+            <EnumInt>0</EnumInt>
+            <PlainCh>0</PlainCh>
+            <Ropi>0</Ropi>
+            <Rwpi>0</Rwpi>
+            <wLevel>2</wLevel>
+            <uThumb>0</uThumb>
+            <uSurpInc>1</uSurpInc>
+            <uC99>0</uC99>
+            <uGnu>0</uGnu>
+            <useXO>0</useXO>
+            <v6Lang>0</v6Lang>
+            <v6LangP>0</v6LangP>
+            <vShortEn>0</vShortEn>
+            <vShortWch>0</vShortWch>
+            <v6Lto>0</v6Lto>
+            <v6WtE>0</v6WtE>
+            <v6Rtti>0</v6Rtti>
+            <VariousControls>
+              <MiscControls></MiscControls>
+              <Define>__FPU_PRESENT</Define>
+              <Undefine></Undefine>
+              <IncludePath>.;..\qpc\3rd_party\CMSIS\Include;..\qpc\3rd_party\ek-tm4c123gxl</IncludePath>
+            </VariousControls>
+          </Cads>
+          <Aads>
+            <interw>1</interw>
+            <Ropi>0</Ropi>
+            <Rwpi>0</Rwpi>
+            <thumb>0</thumb>
+            <SplitLS>0</SplitLS>
+            <SwStkChk>0</SwStkChk>
+            <NoWarn>0</NoWarn>
+            <uSurpInc>1</uSurpInc>
+            <useXO>0</useXO>
+            <uClangAs>0</uClangAs>
+            <VariousControls>
+              <MiscControls></MiscControls>
+              <Define>Stack_Size=1024 Heap_Size=0</Define>
+              <Undefine></Undefine>
+              <IncludePath></IncludePath>
+            </VariousControls>
+          </Aads>
+          <LDads>
+            <umfTarg>1</umfTarg>
+            <Ropi>0</Ropi>
+            <Rwpi>0</Rwpi>
+            <noStLib>0</noStLib>
+            <RepFail>1</RepFail>
+            <useFile>0</useFile>
+            <TextAddressRange>0x00000000</TextAddressRange>
+            <DataAddressRange>0x20000000</DataAddressRange>
+            <pXoBase></pXoBase>
+            <ScatterFile></ScatterFile>
+            <IncludeLibs></IncludeLibs>
+            <IncludeLibsPath></IncludeLibsPath>
+            <Misc>--entry Reset_Handler</Misc>
+            <LinkerInputFile></LinkerInputFile>
+            <DisabledWarnings></DisabledWarnings>
+          </LDads>
+        </TargetArmAds>
+      </TargetOption>
+      <Groups>
+        <Group>
+          <GroupName>Applicatioin</GroupName>
+          <Files>
+            <File>
+              <FileName>bsp.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>.\bsp.c</FilePath>
+            </File>
+            <File>
+              <FileName>main.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>.\main.c</FilePath>
+            </File>
+            <File>
+              <FileName>bsp.h</FileName>
+              <FileType>5</FileType>
+              <FilePath>.\bsp.h</FilePath>
+            </File>
+          </Files>
+        </Group>
+        <Group>
+          <GroupName>ek-tm4c123gxl</GroupName>
+          <Files>
+            <File>
+              <FileName>system_TM4C123GH6PM.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\qpc\3rd_party\ek-tm4c123gxl\system_TM4C123GH6PM.c</FilePath>
+            </File>
+            <File>
+              <FileName>startup_TM4C123GH6PM.s</FileName>
+              <FileType>2</FileType>
+              <FilePath>..\qpc\3rd_party\ek-tm4c123gxl\arm\startup_TM4C123GH6PM.s</FilePath>
+            </File>
+            <File>
+              <FileName>TM4C123GH6PM.h</FileName>
+              <FileType>5</FileType>
+              <FilePath>..\qpc\3rd_party\ek-tm4c123gxl\TM4C123GH6PM.h</FilePath>
+            </File>
+          </Files>
+        </Group>
+      </Groups>
+    </Target>
+  </Targets>
+
+  <RTE>
+    <apis/>
+    <components/>
+    <files/>
+  </RTE>
+
+</Project>

lesson-37/main.c

@@ -0,0 +1,74 @@
+#include <stdint.h>
+#include "bsp.h"
+
+enum { SAMPLE_SIG };
+
+/* background code: non-blocking version */
+int main() {
+    BSP_init();
+    while (1) {
+        /* Blinky polling state machine */
+        static enum {
+            INITIAL,
+            OFF_STATE,
+            ON_STATE
+        } state = INITIAL;
+        static uint32_t start;
+        static uint8_t prev_button = 1U; /* SW1 is inactive high */
+       
+        /* buffering of intputs... */
+        struct {
+            uint16_t sig;
+            
+            /* event parameters */
+            uint32_t now;
+            uint8_t button;
+        } evt, *e;
+        
+        evt.sig = SAMPLE_SIG;
+        evt.now = BSP_tickCtr();
+        evt.button = BSP_SW1();
+        
+        e = &evt;
+        switch (state) {
+            case INITIAL:
+                start = e->now;
+                state = OFF_STATE; /* initial transition */
+                break;
+            case OFF_STATE:
+                if ((e->now - start) > BSP_TICKS_PER_SEC * 3U / 4U) {
+                    BSP_ledGreenOn();
+                    start = e->now;
+                    state = ON_STATE; /* state transition */
+                }
+                else if ((prev_button != 0U) && (e->button == 0U)) { /* derpressed? */
+                    BSP_ledBlueOn();
+                    prev_button = e->button;
+                }
+                else if ((prev_button == 0U) && (e->button != 0U)) { /* released? */
+                    BSP_ledBlueOff();
+                    prev_button = e->button;
+                }
+                break;
+            case ON_STATE:
+                if ((e->now - start) > BSP_TICKS_PER_SEC / 4U) {
+                    BSP_ledGreenOff();
+                    start = e->now;
+                    state = OFF_STATE; /* state transition */
+                }
+                else if ((prev_button != 0U) && (e->button == 0U)) { /* derpressed? */
+                    BSP_ledBlueOn();
+                    prev_button = e->button;
+                }
+                else if ((prev_button == 0U) && (e->button != 0U)) { /* released? */
+                    BSP_ledBlueOff();
+                    prev_button = e->button;
+                }
+                break;
+            default:
+                //error();
+                break;
+        }
+    }
+    //return 0;
+}