Re: Mplab Xc8 Compiler Crack
Alfonzo Liebenstein
The optimizations found on MPLAB XC C Compilers provide code-size reductions and speed enhancements that benefit your design projects. PRO license is available for designs that require maximum code reductions and best performance. The MPLAB XC C Compiler contains a free, 60-day trial of a PRO license for evaluation when activated.
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I am trying to write some programs using MPLAB IDE in C language. For that I have installed version 8.0 MPLAB. But I could not find out the C compiler in it. So how to proceed to get the C compiler. Hope to get quick responses. Cheers!!!
You have to install a C compiler separate. MPLAB supports several C compilers and it's easiest just to download one from Microchip. The compiler you'll need will depend on the chip family you are looking to program against whether it be 8, 16, or 32 bit. You can find more information on the various compilers available from Microchip here.
Our message forum enables CCS customers to exchange ideas and thoughts. Since customers posting on this forum have a great deal of experience with our compiler, this is a good place to go if you are having problems or need help.
The CCS IDE supplies powerful tools for accessing compiler features with easy migration between Microchip device families. Set up projects quickly with application-specific Project Wizards. The IDE C Profiler tool tracks function time and usage information with live data streams from running programs.
CCS is a Premier Microchip Partner, and since 1996, continues to provide quality development tools dedicated to PIC MCUs. Take advantage of our Demo Download to evaluate the advantages of our powerful development tools for yourself. Download Demo
I have installed both the C18 and the XC8 compilers, plus a few others. When I create a new project and select my microprocessor, PIC18F26K22, I get to choose between these two compilers, in addition to the two mpasm assemblers. When they are both available to choose, does that mean that they both work?
How do I decide which one to use? I have tried googling but cant seem to find the answer; perhaps because I don't know what to google for and don't know how to read the results. Or perhaps it makes no real difference which one I pick?
However, there are some issues to be aware of either way. XC8 doesn't implement a software stack. It also does its own linking using a incompatible binary format to that of C18 and MPASM. If you plan to mix C and assembler, and particularly if you have existing MPASM modules, or expect to get any from others, then stay away from XC8.
On the flip side, C18 has its issues too. While the code generator seems to be robust, some of its strategies of how to use the PIC 18 hardware are "less than brilliant". It implements a software stack, but chose a layout that requires the one pre/post inc/dec addressing mode that the PIC 18 doesn't have. Duh! It also reserves two of the three FSR registers for its own use. It also uses a caller-clean stack model for subroutine calls. That means subroutines can't remove data from the stack they're done with before calling other subroutines. The result is that the stack needs considerably more space than it should.
Personally, I stick to MPASM on the 8 bit PICs. I have used C18 in the past for some mixed C/ASM projects, but that was only because I received code that way. It was always more trouble when the compiler was involved, compared to a pure MPASM project. I've also got many subsystems written in MPASM already on the disk, so mostly I just have to add the logic specific to the project. Things like UART handlers, USB device, TCP/IP stack, and many other facilities are already there.
Honestly, I'm OK with all three points for hobby projects, though I try to use 8- or 32-bitters, where open source compilers are available. Less known fact is that source codes of XC16 are available and free to download, probably mostly to satisfy GNU license requirements. Better than -O1 compiler options are fine for squeezing last bits of optimization efforts, though - that's why the paid version exists. Though the sources are available, in professional circles not everybody will spent their expensive time building the compiler (that is far from being trivial exercise) with nobody to ask questions, so they buy directly the full version plus support from Microchip...
...or something. In fact, I'm able to use optimizations higher than -O1 on free version. Compiler complains I have no valid license, but the code builds and runs just fine, with apparent results of compiler optimization efforts. That's what i did on LLG, where I built the code with -O3 and code execution is indeed faster than with -O1. That is where story could end, but I went further.
So, entering -mafrlcsj option into command line should be equal to having proper license. When compiling from command line using make or similar tool, it should be straightforward, within MPLABX IDE it works like this:
It's apparent that with options the compiler tries a bit harder. At Os (where code size is main factor) it gets 20B lower, at O3 (where speed is at premium, code size is secondary) it indeed runs a bit faster.
So, what is described here is option to get full optimization level of XC16 compiler without need to recompile the sources, what is far from being simple task. On the other hand, the gains from full options are not particularly huge, but it doesn't hurt anyway.
I don't think there is anything illegal involved here. The binaries of compiler nor license checker aren't modified in any way, I'm just using command line option that is free version of XC16 distributed with.
All in all, even with 16-bitters from Microchip, one isn't completely lost in corporate greed. Though they are trying to earn as much money as they can, it's still possible to get "canned solution" that you just use with no further fiddling as well as compiler with sources available - to learn and improve.
(sigh) if you give away all the secrets, you only expedite the arms race; lol! -- aren't things nicer as they are presently, with things being so easy?
(and yes, I consider it an obscenity to charge for the build tools' optimization capability -- especially for one they didn't even write, and especially for a chip company. Does Microchip want me to spec PICs in my design, or STM32s?)
Well, there exists SDCC (+gputils) which I use on some of my projects. It works just fine for both PIC16 and PIC18 targets, though XC8 is better in some aspects - it has better stdio support, better code density. On the other hand SDCC is getting better with time, newer daily builds produce something like 5-10% less code than stable 3.6 version. 3.7 stable is to be released soon.
Apart from XC8 and CCS, there is also commercial offering from Mikroelektronika -pic They have quite wide portfolio of products, but I have no practical experience. Somehow mysterious is _c_mx_2_-rad_for_pic.HTM
What are the steps for running static code analysis for unsupported compiler, i'm using XC8 compiler for 8bit micro controllers. I would like to perform only "MISRA C 2004" Static analysis but Parasoft tries to perform compilation.
Users guide on page 48 says:
Microchip
Windows-hosted:
MPLAB C Compiler for dsPIC v3.2x
MPLAB IDE is not supported.
Static analysis support only.
For details on GCC support and a list of unsupported GCC compiler extensions, see GCC Support.
@luj - our analysis depends on sources being compileable and compiler configuration matching the compiler used. In you case you might want to create custom compiler configuration. Please refer to this page for details: +Testing+with+the+Cross+Compiler
Also - what company are you with? Who is your Parasoft representative?
Thanks for quick response, if add xc8 compiler but still struggling to pass any options to xc8 putting any copiler options in Build Settings-> Compiler options does not seem to have any effect. Regarding company i've send You private message.
I already had this error in another dspic project, in my case was an print or fprintf if I'm not wrong.
I vote for going with the X, but we'll loose the compatibility with the icd2 (I remember that there are 2 hardware version of the icd2, the older one(mine) works only in XP and should not be recognised by mplab x, not sure for the other hw version)
The ARM GNU Toolchain is also available as part of Atmel Studio and supports AVR and SAM MCU/MPU products. The toolchain is a collection of tools/libraries used to create applications for AVR microcontrollers. This collection includes compiler, assembler, linker, and Standard C and math libraries. Most of these tools are based on efforts from GNU (www.gnu.org), and some are developed by Microchip. For more information please refer to the release notes. Only those users who wish to run the Microchip AVR GNU Toolchain as standalone tools from the command line need to download and install this package. Two sets of OS downloads are available, one for Windows and one for Linux. Third Party compilers from ARM Keil support AVR and SAM products as well.
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