why do we use both assembly language coding and c programming together in some dsp program?

Anjana,

The rationale is generally this:
C code is generally easier to read but assembly can be faster and more efficient if written well.

Therefore, we prefer to use C whenever possible.  However, in some certain circumstances (situations which are repeated a lot, time-critical code, etc) it may be necessary to put in some extra effort to save a few cycles.  Examples of this may be multi-phase digital power ISRs running at high speed and maybe CRC algorithms.


Thank you,
Brett