F28335 Limited RAM?

are u using spectrum digital ezDSP kit? why don't just use external SDRAM to do it.

Without seeing your command file I am guessing slightly but your problem is likely to do with how the RAM is allocated.  The 68KB on the F28335 is grouped up into a number of smaller blocks which are mainly 8KB long (why you are getting the problem at 2k (4bytes*2k = 8k) ).  However if you use the command file well you can expand these blocks.

Here is some example code below:

For example you will likely see in your linker command file something like this:

   RAML6       : origin = 0x00E000, length = 0x001000     /* on-chip RAM block L1 */
   RAML7       : origin = 0x00F000, length = 0x001000     /* on-chip RAM block L1 */

You can edit this to turn that one line into

RAML6L7 : origin = 0x00E000, length = 0x002000 /* double the length */

You can combine multiple blocks.  You may need to combine 4 of them to do your array.

However you will also have to do a couple more things.  In your C code add this following line (this assumes your buffer is called FFTBuffer - replace with your name):

#pragma DATA_SECTION(FFTBuffer, "buffers");

This will tell the linker that you want a section called buffers.  In your command line add the following line:

 buffers         : > RAML6L7,     PAGE = 1

These lines basically allocate your buffer to a longer piece of RAM.  If you want a very long piece of (slower) external RAM (im not sure if this needs additional setup as well) use this instead:

 buffers        : > ZONE7B,     PAGE = 1

However you might have to increase the size of ZONE7B.

Hopefully this helps.  If you are confused just ask me and I will try and clarify!

Thanks

Tim

Thank you, this has been very informative :) I appreciate the help!

Mike