CrossWorks for ARM User Guide

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}asm("stmfd sp!, {r0}");ctl_interrupt_count++;....// do interrupt handling stuff in here....asm("mov r0, sp");asm("b ctl_exit_isr");Note that the registers SPSR, R0 through R12 and R14 (user mode program counter)must be saved on the stack. The user mode R13 and R14 registers don’t need to besaved because they are held in banked registers.Note that FIQ handlers are not supported on the <strong>ARM</strong>.236 Chapter 26 Low-level interrupt handling
27Memory areasMemory areas provide your application with dynamic allocation of fixed sizedmemory blocks. Memory areas should be used in preference to the standard C librarymalloc and free functions if the calling task (or interrupt service routine) cannot block.You allocate a memory area by declaring it as a C variableCTL_MEMORY_AREA_t m1;A message queue is initialised using the ctl_memory_area_init function.unsigned mem[20];…ctl_message_queue_init(&m1, mem, 2, 10);This example uses an 20 element array <strong>for</strong> the memory. The array is split into 10blocks of each of which two words in size.You can allocate a memory block from a memory area using thectl_memory_area_allocate function. If the memory block cannot be allocated thenzero is returned.unsigned *block = ctl_memory_area_allocate(&m1);if (block)// block has been allocatedelse// no block has been allocatedWhen you have finished with a memory block you should return it to the memoryarea from which it was allocated using ctl_memory_area_free:ctl_memory_area_free(&m1, block);
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CrossWorks for ARMUser GuideRowley
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38 The status bar40 The editing wor
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Chapter 16 173 CrossStudio menu sum
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Part VIAppendicesChapter 35 337 Fil
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1IntroductionThis guide is divided
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•Integrated Debugger The debugger
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After purchasing CrossWorksWhen you
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•Sequences which may be repeated
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Part IICrossStudio ReferenceThis se
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2CrossStudio TutorialCrossStudio al
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The Links to system files group sho
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•In the Project Explorer, right c
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•Select the main.c file.•Click
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Building projectsNow that the proje
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Project code and data sizesDevelope
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Displaying the Symbol BrowserTo dis
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Printing Symbol Browser contentsYou
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•Type F5.The workspace will chang
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Setting up againWhat we'll now do i
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Stopping and starting debuggingYou
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3OverviewThis section introduces th
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The menu barThe menu bar conatins d
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PanelCaret positionCaps lock status
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Changing to Multiple Document Works
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4Project managementCrossWorks has a
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•Combining — a project that can
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•In the New Project dialog, selec
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•Click on the project item to rem
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There is a special configuration na
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Project dependencies and build orde
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•Click on the Project tab.•Sele
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5Building projectsCrossStudio provi
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•From the Build menu, select Buil
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6Source code controlCrossWorks supp
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—or—•In the Project Explorer,
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7Debug expressionsThe debugger can
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8Basic editingCrossStudio has a bui
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KeystrokeLeftRightHomeEndPageUpPage
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—or—•From the Edit menu, clic
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•Either click somewhere in the do
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To cut whole lines from the current
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•From the Edit menu, click Advanc
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•Set the Indent Closing Brace pro
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•Select Edit | Insert File menu i
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•If the search will be carried ou
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Advanced editor featuresCode Templa
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•Select Edit > Advanced > Uncomme
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9Memory map editorMemory map files
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•Input Section Names. The optiona
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10Package managementCrossWorks can
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11Linking and Section placementExec
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The startup code will need to copy
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12CrossStudio WindowsThis section i
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•Repeatedly type Ctrl+Shift+V to
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•Enable, disable and delete exist
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Editing a breakpointTo edit the pro
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—or—•From the Breakpoints win
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—or—•On the Debug tool bar, c
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—or—•On the Debug Location to
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Globals tool barButtonDescriptionDi
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Locals tool barButtonDescriptionDis
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Memory window updatesThe memory win
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Showing the Registers windowTo disp
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clicking on one of the entries in t
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Watch tool barButtonDescriptionDisp
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Expressions you can watchHelp windo
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Output windowThe Output window cont
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The Project Explorer tool barButton
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Source navigator windowOne of the b
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—or—•On the Source Navigator
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variables, the range is the range o
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Grouping symbols by source fileWhen
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•In the Symbol Browser, right cli
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—or—•In the Targets window, c
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Controlling target connectionsReset
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13Target interfacesA target interfa
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•Parallel Port Address The base a
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•Identify Target Specifies whethe
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•Processor Stop Time The timeout
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14ARM Target SupportWhen a target s
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•fiq_handler - This is the defaul
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There is a Heap Size linker project
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Target script fileThe target interf
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efore the debugger starts accessing
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DescriptionTargetInterface.peekByte
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DescriptionTargetInterface.setICEBr
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•Fast Comms Channel Loader — Th
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15DialogsDebug file search editorWh
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•Show full path in title bar. Ena
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16CrossStudio menu summaryThe follo
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Menu command Keystroke DescriptionR
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Menu command Keystroke DescriptionC
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Menu command Keystroke DescriptionP
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The Edit Selection menuEdit Selecti
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Advanced menuThe Advanced menu prov
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Page 195 and 196: The Browser menuBrowser commandsMen
Page 197 and 198: Search menu commandsMenu command Ke
Page 199 and 200: The Build menuBuild menu commandsMe
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Page 203 and 204: Debug Control commandsMenu command
Page 205 and 206: The Debug Windows menuDebug Windows
Page 207 and 208: Menu command Keystroke DescriptionD
Page 209 and 210: The Help menuHelp menu commandsMenu
Page 211 and 212: Part IIITasking Library TutorialThi
Page 213 and 214: 17OverviewThe CTL enables your appl
Page 215 and 216: Timer supportIf your application ca
Page 217 and 218: 18TasksEach task has a correspondin
Page 219 and 220: #include void task1(void *p){// tas
Page 221 and 222: 19Event setsAn event set is a means
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Page 225 and 226: 20SemaphoresA semaphore is a counte
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Page 229 and 230: 21Message queuesA message queue is
Page 231 and 232: void task2(void){void *msg;…ctl_m
Page 233 and 234: 22Byte queuesA byte queue is a stru
Page 235 and 236: {…ctl_byte_queue_init(&m1,queue,
Page 237 and 238: 23Global interrupts controlThe Cros
Page 239 and 240: 24Timer supportThe current time is
Page 241 and 242: 25Programmable interrupt handlingTh
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Page 247: Part IVLibrary ReferenceLibrary Ref
Page 250 and 251: - DiagnosticsThe header file defin
Page 252 and 253: isalnumSynopsisDescriptionPortabili
Page 254 and 255: DescriptionPortabilityispunct retur
Page 256 and 257: The header file defines the macros
Page 258 and 259: INT_MAXSynopsisDescriptionPortabili
Page 260 and 261: UINT_MAXSynopsisDescriptionPortabil
Page 262 and 263: coshfsinhsinhftanhtanhfCompute hype
Page 264 and 265: DescriptionFast math librarybehavio
Page 266 and 267: atanSynopsisDescriptionPortability#
Page 268 and 269: atanhfSynopsisDescriptionFast math
Page 270 and 271: Fast math librarybehaviorIEC 60559
Page 272 and 273: fmaxSynopsis#include double fmax(do
Page 274 and 275: frexp stores power of two in the in
Page 276 and 277: ldexpSynopsis#include double ldexp(
Page 278 and 279: IEC 60559 mathlibrary behaviorPorta
Page 280 and 281: If x = +Infinity and y < 0 and y N
Page 282 and 283: sinhfSynopsis#include float sinhf(f
Page 284 and 285: tanhfSynopsis#include float tanhf(f
Page 286 and 287: - Variable argumentsThe header file
Page 288 and 289: The behaviour of va_start and va_ar
Page 290 and 291: Some CrossWorks library variants do
Page 292 and 293: produces ‘INF’ or ‘NAN’ ins
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A directive that is a conversion sp
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•‘[’. Matches a nonempty sequ
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Portabilityputchar conforms to ISO/
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DescriptionPortabilitysscanf reads
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DescriptionNotesPortabilityvsprintf
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Pseudo-random sequence generation f
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DescriptionPortabilitycalloc alloca
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Description ldiv_t stores the quoti
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See Also srand (page 302) RAND_MAX
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strtofSynopsisDescriptionPortabilit
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strtollSynopsisDescription#include
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If the subject sequence begins with
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Descriptionultoa converts val to a
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memchr returns a pointer to the loc
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DescriptionPortabilitystrcmp compar
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strncmp returns an integer greater
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strtok then searches from there for
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29CrossBuildThe command line progra
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30CrossLoadCrossLoad is a command l
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This command will produce a list of
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31mkhdr - C/C++ header file generat
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32mkpkg - package creatorTo create
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33GCC Online Documentation
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34BINUTILS Online Documentation
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Part VIAppendicesAppendices
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•access The permissable access ty
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ProgramSection elements have the fo
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The next entry is the projects elem
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344 Chapter 35 File formats
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Property Type Save NameExclude From
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Property Type Save NameInclude Debu
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Property Type Save NameSuppress War
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Property Name Type Save NameARM Arc
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Property Name Type Save NameARM Flo
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Property Name Type Save NameGenerat
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Property Name Type Save NameOptimiz
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Property Type Save NameUndefine All
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Property Type Save NameZeroed Secti
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Property Type Save NameLoad Address
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Library PropertiesLibrary OptionsTh
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Printf/Scanf OptionsProperty Type S
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Property Type Save NameScanf Intege
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Property Type Save NameAdditional O
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Property Type Save NameGenerate Map
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Property Type Save NameMemory Map F
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Property Type Save NameStack Size (
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Property Type Save NamePackage Memb
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Combining OptionsThese properties a
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Target OptionsProperty Type Save Na
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Property Type Save NameARM Debug In
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Property Type Save NameDebug Handle
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Property Type Save NameJTAG Data Bi
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Property Type Save NameJTAG Instruc
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Property Type Save NameLast Loader
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Property Type Save NameLoader File
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Simulator OptionsProperty Type Save
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Keystrokes Menu DescriptionCtrl+Pag
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Keystrokes Menu DescriptionCtrl+F E
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Keystrokes Menu DescriptionEdit |Ad
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Keystrokes Menu ActionF3BackspaceDe
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408 Chapter 39 Glossary
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