IAR C-compiler for AVR: Array of pointers to strings in flash

Erik Cato · 2004-02-03T11:28:33+00:00

Hi group!Looking for help from someone with experience with IAR´s C-compilerfor AVR (ATmega16/32)I want to declare an array with pointers to constant text. And both ofthe should be in flash-memory, like this.__flash char * __flash textTab[] ={"Text1","Text2","Text3","Text4","Text5","Text6","Text7","Text8","Text9",};The array is easy to make in flash but the strings i cant manage.I managed to accomplish it by doing like this:__flash char textText1[] = "Text1";__flash char textText2[] = "Text2";__flash char textText3[] = "Text3";__flash char textText4[] = "Text4";__flash char textText5[] = "Text5";__flash char textText6[] = "Text6";__flash char textText7[] = "Text7";__flash char textText8[] = "Text8";__flash char textText9[] = "Text9";__flash unsigned char __flash *textTable[] ={textText1,textText2,textText3,textText4,textText5,textText6,textText7,textText8,textText9,};But this is not sufficient bacause we need a LOT more texts.Anyone got any idea?//Erik

Feb 03, 2004 20 Replies

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Mats Kindahl 22 years ago

You have all the source for the libraries under 'src' in the installation root for the AVR Workbench (which is in the directory 'D:/Program Files/IAR Systems/Ew23/avr' on my computer).

Basically what you have to do is to recompile the write formatter (IIRC, in file frmwri.c, but you have to look that up) and maybe some other files containing printf; If you just make a copy of them and add them to your project the linker will select your functions instead of those in the precompiled libraries.

There are some descriptions about this in the C Compiler Manual (look for _formatted_write... at pages 32-38 in my version), but to get support specifically on your problem I suggest you contact our support department: they are really good at solving these kinds of problems and have more experience with all the details.

You find them on:

formatting link

You will also find application notes and technical articles at the same place.

Best wishes, Mats Kindahl

IAR Systems in Uppsala, Sweden. Any opinions expressed are my own and not those of my company. Spam prevention: contact me at mNaOtSkPiAnM@acm.org or mNaOtSs.kPindAahMl@iar.se, removing the *NO SPAM* from the address.

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