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<div id="projectname">MCUXpresso SDK API Reference Manual
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 <span id="projectnumber">Rev 2.15.000</span>
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<div id="projectbrief">NXP Semiconductors</div>
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<div class="header">
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<div class="title">Semihosting<div class="ingroups"><a class="el" href="a00293.html">Debug Console</a></div></div> </div>
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</div><!--header-->
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<div class="contents">
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<p>Semihosting is a mechanism for ARM targets to communicate input/output requests from application code to a host computer running a debugger. This mechanism can be used, for example, to enable functions in the C library, such as printf() and scanf(), to use the screen and keyboard of the host rather than having a screen and keyboard on the target system.</p>
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<h1><a class="anchor" id="SemihostingGrps"></a>
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Guide Semihosting for IAR</h1>
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<p><b>NOTE:</b> After the setting both "printf" and "scanf" are available for debugging, if you want use PRINTF with semihosting, please make sure the SDK_DEBUGCONSOLE is DEBUGCONSOLE_REDIRECT_TO_TOOLCHAIN.</p>
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<h2>Step 1: Setting up the environment</h2>
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<ol type="1">
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<li>To set debugger options, choose Project>Options. In the Debugger category, click the Setup tab.</li>
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<li>Select Run to main and click OK. This ensures that the debug session starts by running the main function.</li>
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<li>The project is now ready to be built.</li>
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</ol>
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<h2>Step 2: Building the project</h2>
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<ol type="1">
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<li>Compile and link the project by choosing Project>Make or F7.</li>
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<li>Alternatively, click the Make button on the tool bar. The Make command compiles and links those files that have been modified.</li>
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</ol>
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<h2>Step 3: Starting semihosting</h2>
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<ol type="1">
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<li>Choose "Semihosting_IAR" project -> "Options" -> "Debugger" -> "J-Link/J-Trace".</li>
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<li>Choose tab "J-Link/J-Trace" -> "Connection" tab -> "SWD".</li>
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<li>Choose tab "General Options" -> "Library Configurations", select Semihosted, select Via semihosting. Please Make sure the SDK_DEBUGCONSOLE_UART is not defined in project settings.</li>
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<li>Start the project by choosing Project>Download and Debug.</li>
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<li>Choose View>Terminal I/O to display the output from the I/O operations.</li>
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</ol>
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<h1><a class="anchor" id="SemihostingKeilGrps"></a>
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Guide Semihosting for Keil µVision</h1>
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<p><b>NOTE:</b> Semihosting is not support by MDK-ARM, use the retargeting functionality of MDK-ARM instead.</p>
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<h1><a class="anchor" id="SemihostingGrps9"></a>
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Guide Semihosting for MCUXpresso IDE</h1>
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<h2>Step 1: Setting up the environment</h2>
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<ol type="1">
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<li>To set debugger options, choose Project>Properties. select the setting category.</li>
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<li>Select Tool Settings, unfold MCU C Compile.</li>
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<li>Select Preprocessor item.</li>
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<li>Set SDK_DEBUGCONSOLE=0, if set SDK_DEBUGCONSOLE=1, the log will be redirect to the UART.</li>
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</ol>
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<h2>Step 2: Building the project</h2>
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<ol type="1">
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<li>Compile and link the project.</li>
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</ol>
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<h2>Step 3: Starting semihosting</h2>
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<ol type="1">
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<li>Download and debug the project.</li>
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<li>When the project runs successfully, the result can be seen in the Console window.</li>
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</ol>
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<p>Semihosting can also be selected through the "Quick settings" menu in the left bottom window, Quick settings->SDK Debug Console->Semihost console.</p>
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<h1><a class="anchor" id="SemihostingGrps11"></a>
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Guide Semihosting for ARMGCC</h1>
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<h2>Step 1: Setting up the environment</h2>
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<ol type="1">
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<li>Turn on "J-LINK GDB Server" -> Select suitable "Target device" -> "OK".</li>
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<li>Turn on "PuTTY". Set up as follows.<ul>
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<li>"Host Name (or IP address)" : localhost</li>
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<li>"Port" :2333</li>
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<li>"Connection type" : Telet.</li>
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<li>Click "Open".</li>
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</ul>
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</li>
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<li>Increase "Heap/Stack" for GCC to 0x2000: </li>
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</ol>
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<p><b> Add to "CMakeLists.txt" </b></p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} --defsym=__stack_size__=0x2000")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} --defsym=__stack_size__=0x2000")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} --defsym=__heap_size__=0x2000")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} --defsym=__heap_size__=0x2000") </p>
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<h2>Step 2: Building the project</h2>
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<ol>
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<li>
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<p class="startli">Change "CMakeLists.txt": </p>
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<p><b> Change </b> "SET(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} –specs=nano.specs")" </p>
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<p><b>to </b> "SET(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} –specs=rdimon.specs")"</p>
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<p></p>
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<p><b> Replace paragraph </b> </p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -fno-common")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -ffunction-sections")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -fdata-sections")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -ffreestanding")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -fno-builtin")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -mthumb")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -mapcs")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -Xlinker")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} --gc-sections")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -Xlinker")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -static")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -Xlinker")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -z")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -Xlinker")</p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} muldefs")</p>
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<p></p>
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<p><b> To </b></p>
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<p></p>
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<p>SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} --specs=rdimon.specs ") </p>
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<p></p>
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<p></p>
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<p><b> Remove </b> </p>
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<p>target_link_libraries(semihosting_ARMGCC.elf debug nosys)</p>
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<p class="endli"></p>
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</li>
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<li>
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Run "build_debug.bat" to build project </li>
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</ol>
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<h2>Step 3: Starting semihosting</h2>
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<ol type="1">
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<li>Download the image and set as follows. <div class="fragment"><div class="line">cd D:\mcu-sdk-2.0-origin\boards\twrk64f120m\driver_examples\semihosting\armgcc\debug</div>
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<div class="line">d:</div>
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<div class="line">C:\PROGRA~2\GNUTOO~1\4BD65~1.920\bin\arm-none-eabi-gdb.exe</div>
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<div class="line">target remote localhost:2331</div>
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<div class="line">monitor reset</div>
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<div class="line">monitor semihosting enable</div>
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<div class="line">monitor semihosting thumbSWI 0xAB</div>
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<div class="line">monitor semihosting IOClient 1</div>
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<div class="line">monitor flash device = MK64FN1M0xxx12</div>
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<div class="line">load semihosting_ARMGCC.elf</div>
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<div class="line">monitor reg pc = (0x00000004)</div>
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<div class="line">monitor reg sp = (0x00000000)</div>
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<div class="line"><span class="keywordflow">continue</span></div>
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</div><!-- fragment --></li>
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<li>After the setting, press "enter". The PuTTY window now shows the printf() output. </li>
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</ol>
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<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
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<ul class="foot">
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<li class="footer">© 2016 NXP Semiconductors. All rights reserved.
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</li>
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