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Grading

This is a two-week lab. Your prelab is due a week after the quiz for Lab 4, and the quizzing occurs two weeks after thequiz for Lab 4.

Grading for this lab will be a bit different from past labs:

  • 1 point: Prelab
  • 2 points: Working code, implemented from scratch in assembly language or C.
  • 5 points: Optimization. These points will be assigned based on your cycle counts and the optimizations you have made.
  • 2 points: Oral quiz.

Appendix a:

fsk.c

SINE.asm

C_ASM.bat

1 /* ECE320, Lab 5, Reference Implementation (Non-Optimized) */ 2 /* Michael Frutiger 2/24/04 */ 3 4 #include "v:/ece320/54x/dspclib/core.h" /* Declarations for core file */ 5 6 main() 7 { 8 int *Rcvptr,*Xmitptr; /* pointers to Xmit & Rcv Bufs */ 9 int r1,r2; // temp random bit storage 10 int symbol; // 0 for [00], 1 for [01], 2 for [10], 3 for [11] 11 int n; // dummy variable 12 13 int freqs[4] = {9, 13, 21, 17}; // 32*freqs 14 int phase[32]; 15 int output[64]; // temp output storage 16 17 18 // Initial PN generator register contents 19 int seed = 1; 20 21 // Initial phase 22 int prev_phase = 0; 23 24 25 while( 1 ) 26 { 27 /* Wait for a new block of samples */ 28 WaitAudio(&Rcvptr,&Xmitptr); 29 30 // Get next two random bits 31 r1 = randbit( &seed ); 32 r2 = randbit( &seed ); 33 // Convert 2 bit binary number to decimal 34 symbol = series2parallel(r1,r2); 35 36 for (n=0; n<32; n++) 37 { 38 phase[n] = ( freqs[symbol]*n + prev_phase ) % 64; // get into 0 to 64 range 39 if (phase[n] > 32) phase[n]=phase[n]-64; // get into -32 to 32 range 40 phase[n] = phase[n] * 1024; // 1024=2^15*1/32 41 // [-2^15 2^15] range for use with 42 // SINE.asm 43 } 44 sine(&phase[0], &output[0], 32); // compute SINE, put result in output[0 - 31] 45 prev_phase = ( freqs[symbol]*32 + prev_phase ) % 64; // save current phase offset 46 47 // Get next two random bits 48 r1 = randbit( &seed ); 49 r2 = randbit( &seed ); 50 // Convert 2 bit binary number to decimal 51 symbol = series2parallel(r1,r2); 52 53 for (n=0; n<32; n++) 54 { 55 phase[n] = ( freqs[symbol]*n + prev_phase ) % 64; 56 if (phase[n] > 32) phase[n]=phase[n]-64; 57 phase[n] = phase[n] * 1024; 58 } 59 sine(&phase[0], &output[32], 32); 60 prev_phase = ( freqs[symbol]*32 + prev_phase ) % 64; 61 62 63 // Transfer the two symbols to transmit buffer 64 for (n=0; n<64; n++) 65 { 66 Xmitptr[6*n] = output[n]; 67 } 68 69 } 70 } 71 72 73 // Converts 2 bit binary number (r2r1) to decimal 74 int series2parallel(int r2, int r1) 75 { 76 if ((r2==0)&&(r1==0)) return 0; 77 else if ((r2==0)&&(r1==1)) return 1; 78 else if ((r2==1)&&(r1==0)) return 2; 79 else return 3; 80 } 81 82 //Returns as an integer a random bit, based on the 15 low-significance bits in iseed (which is 83 //modified for the next call). 84 int randbit(unsigned int *iseed) 85 { 86 unsigned int newbit; // The accumulated XORs. 87 newbit = (*iseed >> 14) & 1 ^ (*iseed >> 13) & 1; // XOR bit 15 and bit 14 88 // Leftshift the seed and put the result of the XORs in its bit 1. 89 *iseed=(*iseed << 1) | newbit; 90 return (int) newbit; 91 }

Questions & Answers

Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
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Source:  OpenStax, Ece 320 spring 2004. OpenStax CNX. Aug 24, 2004 Download for free at http://cnx.org/content/col10225/1.12
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