Beginning Assembly Language ... !

Hi,

This wud be a good starting point.

http://jason.sdsu.edu/c6x/ASSEMBLE.PDF

Regards,

Sid

Saad Shuja said:

I have done C programming for C6000 DSP, can anyone help where i can start for Assembly language Programming ?

just curiosity... why do you want to programm in assembler? or better - what part in your application requires the use of assembler? if its optimization... it will be quite hard to beat the TI compiler/optimizer from my point of view

Thomas, yes its for optimization. Hey i wanna test the following code written in Assembly

          .def _envelope
_envelope:.cproc    input,prev_in,output,npts
          .reg      i,curr_abs,prev_abs,sign,CONST
          .reg      x,input1,output1,output2
          .reg      C1_Q14,C2_Q14
          MVK       -15415,C2_Q14
          MVK       31565,C1_Q14
          ABS       prev_in,prev_abs
          ZERO      i
LOOP1:    LDH       *input++,input1
          LDH       *--output,output1
          LDH       *--output,output2
          ADD       output,4,output
          ABS       input1,curr_abs
          SUB       curr_abs,prev_abs,x
          SSHL      x,16,x
          SHR       x,5,x
          SMPY      output1,C1_Q14,output1
          SMPY      output2,C2_Q14,output2
          SADD      x,output1,x
          SADD      x,output2,x
          SSHL      x,1,x
          MVK       -32768,CONST
          MVKH      0x00008000,CONST
          SADD      x,CONST,x
          SHR       x,16,x
          STH       x,*output++
          MV        curr_abs,prev_abs
          ADD       i,1,i
          CMPLT     i,npts,sign
    [sign]B         LOOP1
         
          .return
          .endproc

how can i test it. The question is how can i call this function from a C function call. Because when i try to compile it, all variables defined in this routine show that they are undefined.

Hi...

well - as I said, its just curiosity. I try to avoid assembler if possible (and as I said before - I find it more or less impossible to beat the TI optimizer with hand-tuned inline assembler code). The only inline assembler instruction I like is " nop " ;-)

Did you use the possibilities of pragmas and optimizer switches already? You have a loop and porbably can get a lot of performance if you give details of the loop using #pragma MUST_ITERATE

bye,

Thomas