There are great risks in keeping the GCC construction. EXAMPLE 4 - Using a function without a "prolog" and "epilog". The IAR Systems suggestion is to rewrite the inline assembly as a real assembly function in an assembly file. This should not be used in ICCARM as the use of inline assembly should be minimized in order to make the compile more efficient. EXAMPLE 3 - Calling a function with parameters from inline assembler. Replace the GCC construction with the IAR Systems C/C++ Compiler for ARM keyword _SWI. As noted in the example, there is great risk that IAR C/C++ Compiler for ARM (ICCARM) will re-use register R0 and thus create a run-time error. Please rewrite such constructions without reading/using the general registers.
#IAR ARM EXAMPLES CODE#
The examples EXAMPLE 1 - Code referencing to one of the MCU registers. The GCC compiler seems to give the user more responsibility to the user, where IAR Embedded Workbench for ARM instead uses keywords, intrinsic functions and/or options for covering the same construction in the application. The goal is that the 9 examples + comments should cover the issues that are most different between GCC and IAR Embedded Workbench for ARM, and that other issues can be sorted out by the developer that performs the migration. The most different area between GCC and IAR Embedded Workbench for ARM is Inline Assembler and such constructions (and some other issues) will be commented in this Technical Note (and in the attachment). This might seem to be trivial task (as IAR have written other Migration Guides), but it is not trivial - as there is no "one single GCC compiler" we are not able to cover all GCC variants. Now and then there are users requesting that IAR makes a "GCC to IAR Embedded Workbench for ARM Migration Guide". We are most grateful that he shares his findings with IAR Embedded Workbench for ARM users. Ivan Paulik, Pasat, Bratislava, Slovakia, Europe. We may also share this information with third parties for this purpose.This Technical Note discusses migration from GCC inline assembler to IAR Embedded Workbench for ARM. This Technical Note applies to ARM7/9 devices, not to Cortex devices. We will use this information to make the website and the advertising displayed on it more relevant to your interests. Targeting/Profiling Cookies: These cookies record your visit to our website and/or your use of the services, the pages you have visited and the links you have followed. Loss of the information in these cookies may make our services less functional, but would not prevent the website from working. This enables us to personalize our content for you, greet you by name and remember your preferences (for example, your choice of language or region). Functionality Cookies: These cookies are used to recognize you when you return to our website. This helps us to improve the way the website works, for example, by ensuring that users are easily finding what they are looking for. Analytics/Performance Cookies: These cookies allow us to carry out web analytics or other forms of audience measuring such as recognizing and counting the number of visitors and seeing how visitors move around our website. They either serve the sole purpose of carrying out network transmissions or are strictly necessary to provide an online service explicitly requested by you. The cookies we use can be categorized as follows: Strictly Necessary Cookies: These are cookies that are required for the operation of or specific functionality offered.
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