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This Lab Module has the project outline for a simple assembly display program. The program is interrupt driven and combines GPIO, polling, and interrupt concepts.

A more complicated assembly program

By now you already have all of the tools you need to complete this assignment. Remember what you have learned about MSP430 assembly language , setting up GPIO , and using interrupts .

  1. Coding in MSP430 assembly, implement an interrupt driven number sequence recorder . You will use the same input configuration from last week (get data from pins 9.4-9.7 on an interrupt from pin 3.7), but now will output a readable loop of the last 5 received numbers in order. Assignment Details

Part ii assignment detail

Your task is to write an assembly program to display a programmable sequence of 5 numbers on the MSP430 ESCAPE Platform.

  • You should use five slots to store the input numbers.
  • Since our simple setup only has one display, you will have to rotate through each of the five numbers after a "short" (in human terms) delay.
  • Use an ISR to store a new number in the "next" slot. (Next not necessarily meaning what is currently being displayed). The input should go from slot 1 to 2 to 3... etc. regardless of which slot is currently being output.
  • The program should only display a slot after a number has been input into it. You will need to keep track of which slots have been filled.
Slot fill chart-- shows how the slots should be filled sequentially.
Only grey boxes are output to the display. Also, notice how after filling all five slots, the ISR loops back and starts filling from the beginning.
Your program should consist of:
  • A setup routine that readies all the components of your program.
  • A main loop that displays the stored numbers one after the other with a readable delay in between.
  • An ISR that stores each new input number to the appropriate slot.

    A few hints:

  • The MSP430 operates at ~13MHz, which may seem slow in terms of computers, but is much too fast for the human eye to process (~30Hz). You will have to implement a very significant delay in between number changes.
  • One way to generate a naive delay is a long loop which does nothing. You may even need to use a nested loop depending on how long of a delay you need.

    Nested Loop Example in C:

    int i=0; int j=0;for (i=0; i<bigNumber; i=i+1) {for(j=bigNumber; j>0; j=j-1) {<!--This code will run ixj times-->; }}
  • You may find it convenient to put your five slots in RAM instead of using registers. You can then store a memory address in the register, and then increment it or set it as needed. You will need to use indirect addressing mode though. mov R4, 0(R15); moves the contents of R4 to the address in R15 mov 0(R15), R4; moves the contents of the address in R15 into R4 mov&0x006300, R4; moves the contents of memory address 0x006300 into R4
  • Consider where it may be useful to implement parts of your program in subroutines

Wrapup

Congratulations on completing lab 4! Your program sophistication has dramatically increased. You understand the basics of interrupt driven programming , and know how to use assembly level subroutines . You have had to keep track of data as well as design a responsive I/O interface to the outside world. Keep up the good work!

Labs based on the original Elec 220 labs maintained by Michael Wu.

Images from original lab documents by Yang Sun. Modified by Matt Johnson.

Questions & Answers

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
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
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Elec 220 lab course (escape). OpenStax CNX. Apr 07, 2013 Download for free at http://cnx.org/content/col11513/1.1
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