- Mplab xc8 example code full#
- Mplab xc8 example code pro#
- Mplab xc8 example code software#
- Mplab xc8 example code code#
Mplab xc8 example code code#
filesĪ project is the term used to describe the collection of source code files, programming information, debugging information, and settings that you use when creating your program. All of the programs on this site can be used in the MPLAB X IDE. The MPLAB X IDE is a free and open IDE based on Netbeans and replaces Microchip's older MPLAB 8 IDE.
Mplab xc8 example code software#
An IDE contains all of the tools a programmer needs to create, edit, debug, compiler/assemble, and download microcontroller programs in one integrated software suite. Hopefully that might get you up and running and it might be a good additional test case to submit to Microchip.IDE stands for Integrated Development Environment. When I compared my compiler / linker options to yours under the XC8 compiler optimizations I also had to enable "Instruction Invariant Mode" for it to work.
Mplab xc8 example code pro#
Note that I only have the free compiler so the pro edition may optimize out the constant array access, but I'd imagine changing the index to a variable would fix that if it does happen.
Mplab xc8 example code full#
I suspect based on that it tries to perform some optimization on writing to a multi-byte variable that falls down, but when inside an array it generates the full code to calculate the offset that seems to work OK. The following code compiles OK and seems to generate plausible assembler output although I didn't have a chip with external RAM to test: #include The problem only seems to occur with multi-byte variables outside an array or when trying to access the first element of an array. I was just having a play around with this and it seems like something you should report to Microchip but I have found a workaround that might be useful in the interim. What am I doing wrong? The compiler output doesn't help much, as the error is way too generic to give any clue. Microchip MPLAB XC8 C Compiler (PRO Mode) V1.35Ĭopyright (C) 2015 Microchip Technology Inc. Main.c:10: error: (712) can't generate code for this expression Main.c:9: error: (712) can't generate code for this expression "/opt/microchip/xc8/v1.35/bin/xc8" -chip=18F8720 -G -mdist/default/production/Test01.X.production.map -double=24 -float=24 -emi=byteselect -ram=default,+20000-9FFFF -opt=default,+asm,+asmfile,-speed,+space,-debug -addrqual=require -mode=pro -P -N255 -warn=-3 -asmlist -summary=default,-psect,-class,+mem,-hex,-file -output=default,-inhx032 -runtime=default,+clear,+init,-keep,-no_startup,-download,+config,+clib,-plib -output=-mcof,+elf:multilocs -stack=compiled:auto:auto:auto "-errformat=%f:%l: error: (%n) %s" "-warnformat=%f:%l: warning: (%n) %s" "-msgformat=%f:%l: advisory: (%n) %s" -memorysummary dist/default/production/memoryfile.xml -odist/default/production/Test01.X.production.elf build/default/production/main.p1 "/opt/microchip/xc8/v1.35/bin/xc8" -pass1 -chip=18F8720 -Q -G -double=24 -float=24 -emi=byteselect -ram=default,+20000-9FFFF -opt=default,+asm,+asmfile,-speed,+space,-debug -addrqual=require -mode=pro -P -N255 -warn=-3 -asmlist -summary=default,-psect,-class,+mem,-hex,-file -output=default,-inhx032 -runtime=default,+clear,+init,-keep,-no_startup,-download,+config,+clib,-plib -output=-mcof,+elf:multilocs -stack=compiled:auto:auto:auto "-errformat=%f:%l: error: (%n) %s" "-warnformat=%f:%l: warning: (%n) %s" "-msgformat=%f:%l: advisory: (%n) %s" -obuild/default/production/main.p1 main.c The compilation+linking commands are generated by MPLAB X v3.20: This error is reproducible, even in this small example program: #include This doesn't happen when reading far variables: only when writing into them. Whenever I try to write some code to modify a variable in the external memory, the linker throws an error (712): "can't generate code for this expression".
I'm currently having a bad time trying to use an external RAM chip (512 kB) with a PIC18F8720 and the Microchip XC8 compiler (v1.35, PRO mode).
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