Hi, why don't you have a try with this syntax, then check the map file?
mcc18 uses #pragmas to do that, but __at is probably the correct way with sdcc. I don't think that's a professionnality issue :) An idea, you could check how it's done in device header files. Here, the SFR are declared as variables mapped at specific addresses. i'm interested in the results of your tests regards sebastien Le 02/02/2012 09:20, Butuza Tamas a écrit : > Dear sdcc developers and users, > > I have an "advanced?" question: > I need to define a fixed length array in the ram of the pic18F25J50. > > It is a descriptor block for the internal USB peripheral of the mcu and > should be placed exactly to 0x400 address in ram. > Of course this place should be kept clear by the linker and compiler when > assign place to the other variables. > > The best way should be define a special section in the linker script but I do > not know how to do this, and did not found any information mregarding this. > (In gputils doc) > Write this into the lkr file should work?: > DATABANK NAME=usb START=0x400 END=0x420 > How should I assign an array in C source to this section? > Could you please provide the syntax? > > Other (less professional ?) way is use the __at (0x400) directive, but I'm > not sure it is safe enough: > Will this place kept clear from other variables? > > volatile unsigned char[32] __at (0x400) usbDP; > > Did anybody tried this, and have any experience? > > Best regards, > Tamas Butuza > > > ------------------------------------------------------------------------------ > Keep Your Developer Skills Current with LearnDevNow! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > Sdcc-user mailing list > Sdcc-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sdcc-user ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
