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The following lines of code were borrowed from the C FFT to serve as an example of arithmetic operations in C. Savethis code in a file called mathex.c and compile this file by typing c_asm mathex.c at a command prompt. Look at the resulting assembly file and investigate the differences betweeneach block. Be sure to reference page 6-10 of the compiler user's guide to findout what the state of the FRCT and OVM bits are. Run this program on the DSP, halt the program, and compare theoutput values in a memory window. Does each block work properly for all possible values?

int s1, s2; int t1, t2; int i1, i2; int n1 = 16383, n2 = 16382, n3 = 16381, n4 = 16380; void main(void) { /* Code for standard 32-bit hardware, */ /* with x,y limited to 16 bits */ s1 = (n1*n2 + n3*n4) >> 15; s2 = (n1 + n2) >> 1; /* Code for TI TMS320C54X series */ t1 = ((long int)(n1*n2) + (long int)(n3*n4)) >> 15; t2 = ((long int)n1 + (long int)n2) >> 1; /* Intrinsic code for TMS320C54X series */ i1 = _sadd(_smpy(n1,n2), _smpy(n3,n4)); i2 = _sshl(_sadd(n1, n2),-1); while(1); }

Compiling and linking

A working program can be produced by compiling the C code and linking assembly modules and the core module. The compilertranslates C code to a relocatable assembly form. The linker assigns physical addresses on the DSP to the relocatable dataand code segments, resolves .global references and links runtime libraries.

The procedure for compiling C code and linking assembly modules has been automated for you in the batch file v:\ece420\54x\dsptools\c_asm.bat . The name of the first file becomes the name of the executable. Once you havecompleted lab4main.c and c_fft_given.asm , type c_asm lab4main.c c_fft_given.asm to produce a lab4main.out file to be loaded onto the DSP. For the C FFT type c_asm lab4main.c lab4fft.c to produce lab4main.out . Load the output file onto the DSP as usual and confirmthat valid FFTs are calculated. Once valid output is obtained, measure howmany clock cycles it takes to compute both the assembly and C FFT.

Reference implementation of a psd estimator

We provide for you in Appendix D and E a complete C implementation of a PSD estimator. The input is an IIR-filtered pseudo-noise (PN)sequence generator and the PSD estimate is based on windowing the autocorrelation with a rectangular window.The code consists of the files lab4bmain.c , lab4b.h , intrinsics.h , pn.c , iirfilt.c , autocorr.c , c_fft_given_iirc.asm , and the previously-given TI FFT routine. The assembly file c_fft_given_iirc.asm differs from c_fft_given.asm in that the window array has been removed and variables and arrays associated with IIR filtering havebeen added. Note that the multiply functions in the functions are actually compiler directives contained in intrinsics.h . Make sure you know which ones are used and why; note that VPO is not defined by the TI compiler, therefore the corresponding section of the #ifdef statement is not used. Compile and link these files by issuing c_asm lab4bmain.c pn.c iirfilt.c autocorr.c c_fft_given_iirc.asm at the command line. Load lab4bmain.out onto the DSP and run the code. Make sure that anIIR-filtered PN sequence appears on channel 1 and its PSD estimate appears on channel 2.

Questions & Answers

what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Digital signal processing laboratory (ece 420). OpenStax CNX. Sep 27, 2006 Download for free at http://cnx.org/content/col10236/1.14
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