First, you need to edit the linker_flash.cmd file, in order to create a
section in the pflash memory. I do it like this: (56f803) .pflash (RX) : ORIGIN = 0x0000, LENGTH = 0x6D00 # program flash memory .pConst (RWX) : ORIGIN = 0x6D00, LENGTH = 0x1100 # constant fields (the original was .pflash (RX) : ORIGIN = 0x0000, LENGTH = 0x7E00 # program flash memory ) If you select "Write constant data to .rodata section" in the CW5/FLASH settings - Code Generation - M56800 Processor, then your constants will be placed automatically in a section called ".rodata". Your fields need to be defined as constants! You have to place your .rodata section in the above created pConst section: .pconst_data: { * (.rodata) } > .pConst Now you only need to gain access to your data, which cannot be done directly from C. U need a snippet of assembly code: UWord16 asm read_p_memory (int * addr) { move p:(r2)+,y0 rts } And then you will be able to access the data like read_p_memory((int*)&int_field[index]); Best wishes, Georg Bende Softwareentwickler Abteilung Elektronik Dr. Fritz Faulhaber GmbH & Co KG Daimlerstr. 23 71101 Schaich Tel: +49 7031 638294 > -----Ursprgliche Nachricht----- > Von: bmbmz123 [mailto:] > Gesendet: Montag, 9. Juni 2003 16:37 > An: > Betreff: [motoroladsp] 56F826 - placing large constant data array in > Program Flash > > Hello all, > > I am using large constant data array tables. > The const data extends beyond the 2k flash available in the data > section. > It may even extend beyond the 4k RAM available. > > I want to place the arrays in Program Flash, and read the data during > runtime. > An access using array-index is prferrable. > > Any suggestion? > > 10x > > bz > > > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author > of this message will receive your answer. You need to do a "reply all" if > you want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: > > To Post: > > To Leave: > > Archives: http://www.yahoogroups.com/group/motoroladsp > > More Groups: http://www.dsprelated.com/groups.php3 > ">http://docs.yahoo.com/info/terms/ > |