# 2.1 C programming lab

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This is the lab assignment portion for the C Programming lab.

## Skills

This laboratory deals with compiling and running a C program on the TMS320C6713 DSP using Code Composer Studio. By the end of the laboratory you will be able to:

• Compile and build a C language program
• Run a C language program on the TMS320C6713 DSP
• Link multiple files with functions into one project

## Description

If you have forgotten how to program in C/C++ you should review C programming on the many tutorials on the internet or look through your favorite textbook or reference book. This document will not give you a tutorial on how to program in C/C++.

You must remember that when programming the TI DSP you are loading your program into a system that has its own DSP and memory and is apart from your computer. In order for you to print anything, the data must be sent from the DSP board to CCS and then displayed in the stdio display. This can be very slow so you will want to use the debugging tools to view variables.

In this lab you will be writing very simple C programs. If you want to print something you will obviously need to include the stdio.h file.

Your main program should look like:

#include<stdio.h>main() {variables code}

Be sure to use good programming style.

## Pre-laboratory

Write a C program that performs a dot product of the following vectors. The data for a and b should be stored in integer arrays. Use a for loop.

a = [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30]

b = [30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1]

$y=\sum _{k}{a}_{k}\cdot {b}_{k}$

## Part 1

• In this part you will create a project that performs the array multiply and sum within the main function of the program. In order to be able to accurately count clock cycles, use the C6713 simulator.
• Create a new project, call it clab.
• Create your C file. Call it main.c . Add this file to your project.
• You should use the following options for the project (Project->Build Options):
• After the project has been loaded, record the values in the variables at each step as you single step through the program. Count the number of clock cycles and compare to the assembly program completed in a previous lab. Be sure to zero the counter before stepping through your code.

## Part 2

• In this part you are going to write a function that performs an array multiply and sum algorithm and returns the sum. This function will be located in another file and you will also make a header file.
• Create a C file called multsum.c . In this file make a function called multsum . The function should have as inputs:
• pointer to integer array a
• pointer to integer array b
• number of elements in the arrays
• The output of the function should be the integer sum. The function should perform the multiply and sum algorithm.
• Create a header file for the multsum function and call it multsum.h . In the header include the following code:
#ifndef _MULTSUM_H_ #define _MULTSUM_H_extern int multsum(int *a, int *b, int length); #endif /*MULTSUM_H_*/

This uses some compiler directives to determine if the current header file has already been included by another include file. The macro _MULTSUM_H_ is not defined the first time it is encountered so the macro is defined and the definition is included. The extern keyword tells the compiler that the function is defined in another file.

• In main.c :
• include the multsum.h file
#include "multsum.h"
• declare the a and b arrays
• call the multsum function with the sum returned to a variable
• Include the multsum.c file in your project.
• Run the program and verify that the sum that is returned is correct.

#### Questions & Answers

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
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
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
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Dsp lab with ti c6x dsp and c6713 dsk. OpenStax CNX. Feb 18, 2013 Download for free at http://cnx.org/content/col11264/1.6
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