Converting C5515 Assembly code to C6727B Processorver

GSR,

I know the code that you are referring to in this case. One key detail that you are missing in your post is the first input pointer is initialized to the last sample in the buffer while the second input pointer is initialized to the first sample in its input buffer. That makes this code equivalent of computing one sample of filtered output using simple convolution of input samples with filter co-efficients. Refer to the diagram below

 I am pretty sure there is equivalent assembly or intrinsic C code for convolution function in C67x DSPLIB found here

http://www.ti.com/tool/sprc265 (The code however would be for floating point function )

If that doesn`t work, here is the Equivalent pseudo code

int32 acc;

for (i=0; i<FILTERORDER; i++)

 acc=acc+ x1[FILTERORDER-i-1]*x2[i]

y[1] = (int16) (( acc & 0xFFFF0000)>>16) //Extract top 16 bits

y[0] = (int16) (acc & 0x0000FFFF)  //Extract bottom 16 bits

where x1 and x2 are input and y is the output.

Try that out and let me know. Good luck!!

Regards,

Rahul

GSR,

The C6000 Compiler User's Guide has the information you need to learn about interfacing C and Assembly. I doubt I can explain it any better. You seem to know a lot of it already.

For C6000 applications, it is usually our recommendation to write your application in C, use the optimizer features, then see how good your performance is. It will save you a lot of time and trouble if you can stay with the output of the compiler, and our C6000 compiler is very good. Some complex instructions may have to be accessed using intrinsics, but still through the compiler.

You can also look at the assembly output from the compiler and use that as a starting point for your assembly development, if you do not like the optimizer's results. This will give you all the basics, like stack space allocation and argument passing. Plus it will give you some good examples to learn C6000 assembly programming from.

The C5000 and C6000 architectures are both very capable for their intended applications. Really good performance with low power dissipation and low cost make the C5000 perfect for many applications. High performance at high clock rates and high-speed peripherals make the C6000 perfect for many applications. But the architectures are very different, and the C6000 is much less friendly for assembly programming. Please avoid it if at all possible. We make the compiler really good because it is difficult to program the C6000 in assembly.

Regards,
RandyP