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Discussion Groups | TMS320C54x | Problem with memory alignment for DSPLIB
Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).
Problem with memory alignment for DSPLIB - Markus Bühren - Jun 17 15:56:00 2003
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Hi! I want to use the fir function of the dsplib on a DSK5416 and have a question about circular buffers and memory alignment. As far as I know it is possible to do it this way: 1. Use some "#pragma DATA_SECTION" command in the C++ code. 2. Use some "align (N)" stuff in the linker command file. I am using DSP/BIOS in my project and the DSP/BIOS configuration tool maintains the linker command file called <projectname>cfg.cmd itself. So I do not have to care about the very low level details of memory. If I want to use the fir function now following the steps mentioned above, I have to use a different linker command file that is no longer automatically changed by the DSP/BIOS configuration tool. But this means I have to care about memory things now! Isn't there an easier way to go without leaving C++? I would appreciate any advise or comments of those who also work with the dsplib! Thanks in advance! Markus |
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Re: Problem with memory alignment for DSPLIB - chunyan_lcy - Jun 18 0:12:00 2003
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Just add a customized .cmd file into your project besides the automatically generated one. For example, your project name is p1, after using BIOS configuration tools, p1cfg.cmd is automatically generated, and in which a block of memory called ALIGN_DATA is configured. If you want to put the aligned buffer into section ALIGN_DATA, you should add a customized cmd file as following(i.e. named link.cmd) to your project: ////////////////////////////////////// -lp1cfg.cmd SECTIONS { align_buffer:{ *(align_buffer) } > ALIGN_DATA , align(128) } ///////////////////////////////////// Of course, you have to define section "align_buffer" in your C using #pragma -Chunyan --- In , Markus Bühren <markus.buehren@l...> wrote: > Hi! > > I want to use the fir function of the dsplib on a DSK5416 and have a > question about circular buffers and memory alignment. As far as I > know it is possible to do it this way: > > 1. Use some "#pragma DATA_SECTION" command in the C++ code. > > 2. Use some "align (N)" stuff in the linker command file. > > I am using DSP/BIOS in my project and the DSP/BIOS configuration tool > maintains the linker command file called <projectname>cfg.cmd itself. > So I do not have to care about the very low level details of memory. > > If I want to use the fir function now following the steps mentioned > above, I have to use a different linker command file that is no > longer automatically changed by the DSP/BIOS configuration tool. But > this means I have to care about memory things now! > > Isn't there an easier way to go without leaving C++? > > I would appreciate any advise or comments of those who also work with > the dsplib! Thanks in advance! > > Markus |
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