<< Chapter < Page Chapter >> Page >
// lab4b.c // Uses PN generation, IIR filtering, and autocorrelation // code by Matt Kleffner -9/2004 // Based on swi_process.c by Educational DSP #include "dsk5510_dual3006cfg.h" #include "dsk5510.h" #include "swi_process.h" #include "dsplib.h" #include "lab4b.h" /* Define N here in header file */ /* function defined in pn.c */ void rand_fillbuffer(void); /* IIR values and buffers (declared in c_fft_given_iirc.asm) */ #define IIR_order 4 extern int scale; extern int coef[IIR_order]; extern int state[IIR_order]; /* Pointer to state buffer location */ int iirptr; extern unsigned int *iseed; /* seed for rand_fillbuffer() and randbit() */ /* function defined in iirfilt.c */ void iirfilt(void); /* function defined in autocorr.c */ void autocorr(void); /* Function defined by c_fft_given_iirc.asm */ //void bit_rev_fft(void); /* FFT data buffers (declared in c_fft_given_iirc.asm) */ extern int bit_rev_data[N*2]; /* Data output for bit-reverse function */ extern int fft_data[N*2]; /* In-place FFT input & Output array */ /* Our input/output buffers */ int autocorr_in[N]; int autocorr_out[N]; // all data processing should be done in SWI_ProcessBuffer void SWI_ProcessBuffer() { static unsigned int mbox_value = 0; short *psrc, *pdest; unsigned int i; mbox_value |= SWI_getmbox(); // buffers are only processed when both transmit and receive are ready if((mbox_value & DMA_RECEIVE_DONE) && (mbox_value & DMA_TRANSMIT_DONE)) { mbox_value = 0; // get buffer pointers psrc = receive_buffer[receive_buffer_to_process_index]; pdest = transmit_buffer[transmit_buffer_to_fill_index]; /* First, transfer inputs and outputs */ for (i = 0; i < N; i++) { pdest[4*i] = autocorr_in[i]; pdest[4*i+1] = bit_rev_data[i*2] << 8; /* Some statements useful in debugging */ /* pdest[4*i] = psrc[4*i+2]; */ /* Be sure to comment out PN-sequence generation */ /* when using the next two lines */ //autocorr_in[i] = psrc[4i+2]; } /* Last, set the DC coefficient to -1 for a trigger pulse */ pdest[0] = -32768; /* Generate PN input */ rand_fillbuffer(); /* Filter input */ iirfilt(); /* Calculate autocorrelation */ autocorr(); /* Transfer autocorr output to FFT input buffer */ for (i = 0; i < N; i++) { fft_data[i*2] = autocorr_out[i]; fft_data[i*2+1] = 0; } // Bit-reverse and compute FFT cfft((DATA *)fft_data,N, SCALE); cbrev((DATA *)fft_data,(DATA *)bit_rev_data,N); /* Done, wait for next time around! */ receive_buffer_processed = 1; // flag receive buffer as processed transmit_buffer_filled = 1; // flag output buffer as full } } // lab4bmain.c // based on main.c by Educational DSP // Initializes autocorr_out, state, and iseed. // Can be modified for optimization. #include "dsk5510_dual3006cfg.h" #include "dsk5510.h" #include <csl.h> #include "lab4b.h" #define IIR_order 4 extern int iirptr; unsigned int *iseed; extern int autocorr_out[N]; extern int state[IIR_order]; void init_DMA(); void main() { int i; DSK5510_init(); // init BSL DSK5510_rset(DSK5510_MISC, 0x03); // route McBSP0/1 to J3 // Initialize autocorr_out to zero since some values will remain zero for (i = 0; i < N; ++i) { autocorr_out[i] = 0; } for ( i = 0; i < IIR_order; ++i) state[i] = 0; // Start McBSP0 I2S slave MCBSP_start(hMcbsp0, MCBSP_XMIT_START | MCBSP_RCV_START | MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC, 220); // Start McBSP1 I2S master MCBSP_start(hMcbsp1, MCBSP_XMIT_START | MCBSP_RCV_START | MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC, 220); init_DMA(); // configure DMA and interrupts *iseed = 1; iirptr = 0; return; // let DSP/BIOS scheduler take over }

Questions & Answers

how can chip be made from sand
Eke Reply
are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
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
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
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
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
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
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Digital signal processing laboratory (ece 420 55x). OpenStax CNX. Jan 18, 2010 Download for free at http://cnx.org/content/col10397/1.10
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Digital signal processing laboratory (ece 420 55x)' conversation and receive update notifications?

Ask