[求助]不胜感谢！ 求助, 感谢

pennyllin

请大虾帮忙：我需要向nios 里移植一个FFT算法（用c或c++)，需要做那些工作呢？

kzw

如果是fft的算法，你就把算法方面的计算的东西移过去就行了阿。不是用硬件实现的吧。

pennyllin

暂时没有打算用硬件实现，所有的运算都用软件，nios的定制是不是很简单？
初步打算先编一个信号，对之处理，看一下输出，验证一下fft程序的正确性 。
但现在又有问题是：我这个编好的信号怎么存放？

kzw

可以存放在片内ram中，做成rom的形式吧，最好是周期信号啊，非周期不好办。

pennyllin

为什么“最好是周期信号啊，非周期不好办”呢？请版主不吝赐教！

pennyllin

是便于验证吗？

kzw

对啊，这样就是验证一下啊，因为非周期信号不可能模拟保存的下的啊。
非周期信号也只能实时采集信号了。

pennyllin

非常感谢版主赐教！

pennyllin

我把蝶形单元的c程序模块放nios ide 中builder，出现下面的错误，请版主赐教！
**** Incremental build of configuration Debug for project fft_0 ****

make -s all
Linking fft_0.elf...
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: region onchip_memory_0 is full (fft_0.elf section .text). Region needs to be 40596 bytes larger.
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: region onchip_memory_0 is full (fft_0.elf section .bss). Region needs to be 396 bytes larger.
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: address 0x118c of fft_0.elf section .onchip_memory_0 is not within region onchip_memory_0
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: section .rodata [00000020 -> 000004f7] overlaps section .exceptions [00000020 -> 000001c7]
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: section .rwdata [000004f8 -> 00000f77] overlaps section .text [000001c8 -> 0000ae93]
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: section .bss [00000f78 -> 0000118b] overlaps section .text [000001c8 -> 0000ae93]
collect2: ld returned 1 exit status
make: *** [fft_0.elf] Error 1
Build completed

pennyllin

我把我编的整个程序加进去builde时，又出现一下错误：
**** Incremental build of configuration Debug for project fft_0 ****

make -s all
Linking fft_0.elf...
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: region onchip_memory_0 is full (fft_0.elf section .text). Region needs to be 40596 bytes larger.
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: region onchip_memory_0 is full (fft_0.elf section .bss). Region needs to be 396 bytes larger.
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: address 0x118c of fft_0.elf section .onchip_memory_0 is not within region onchip_memory_0
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: section .rodata [00000020 -> 000004f7] overlaps section .exceptions [00000020 -> 000001c7]
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: section .rwdata [000004f8 -> 00000f77] overlaps section .text [000001c8 -> 0000ae93]
/cygdrive/d/altera/kits/nios2_51/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: section .bss [00000f78 -> 0000118b] overlaps section .text [000001c8 -> 0000ae93]
collect2: ld returned 1 exit status
make: *** [fft_0.elf] Error 1
Build completed

oceanx

onchip_memory_0 is full
FPGA片上RAM不够。。。移到外面的空间去

pennyllin

请版主别生气，我还要请教一个极菜问题：
在nios定制时，我是否只要添加CPU、ON-CHIP MEMORY 、UART可以了？？

pennyllin

是移到SDRAM或flash中吗？是不是nios 定制时把on chip memory 改成SDRAM或flash就可以了？

[此贴子已经被作者于2006-9-14 16:38:14编辑过]

kzw

不是这个意思，使把你的代码空间放到片外的ram中，我只是说把你的fft的数据存放到片内ram中。

pennyllin

知道了，谢谢版主！