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Using the MSP-EXP430FG4618 Development Tool and the MSP430FG4618 device perform a frequency measurement.

Laboratory timers: lab5 - frequency measurement

Introduction

Correct system timing is a fundamental requirement for the proper operation of a real-time application. The timing definition can dictate how the data information processed during the execution of the application program. The clock implementations vary between devices in the MSP430 family. Each device provides different clock sources, controls and uses. This chapter discusses the clock controls included in the platforms used.

The MSP430 4xx family has two general-purpose 16-bit or 8-bit counters and event timers, named Timer_A, Timer_B, and a Basic Timer. The Basic Timer module is only implemented in ‘4xx devices. The 2xx device family also has Timer_A and Timer_B, but the clock signals are provided by the basic clock module+.

The timers may receive an internal or external clock. Timer_A and Timer_B also include multiple independent capture and compare blocks, with interrupt capabilities.

Overview

This laboratory implements an application ( Lab5_Timers.c ) designed to measure a PWM signal frequency. If a signal generator is not available, the microcontroller generates a PWM signal based on the frequencies stored in a file. The frequencies generated are read and updated with a fixed time period using the features of CCE . The measured value is shown on the LCD in Hz.

Resources

The module FLL+ is configured to a frequency of 7.995392 MHz for the MCLK and SMCLK clock signals. This application performs the two tasks simultaneously.

On the one hand, it generates a PWM signal with a frequency of 200 Hz and a duty cycle of 50%. Alternatively, the PWM signal frequency can be read from a file using a breakpoint. This function is performed by Timer_B, using the compare unit to generate the PWM signal.

The time period between two consecutive PWM signals low-to-high transitions is measured by Timer_A. The capture unit of this timer is configured to collect the Timer_A counter register’s contents when a PWM signal low-to-high transition is detected at its input.

The Basic Timer1 generates an interrupt once every second. The ISR updates the PWM signal frequency generated by the Timer_B. If you choose to use this feature, a breakpoint associated with this ISR execution allows reading a file with the value of the frequency that will be generated.

The microcontroller’s ports are configured in order that the PWM signal generated by Timer_B through the TBCCR4 compare unit available at Port P3.5/TB4 can be connected to the Port P1.2/TA1 of the Timer_A TACCR1 capture unit. If you plan to use this feature, these pins must be connected together. Port P3.5 pin is available on Header 7 pin 6, while the Port P1.2 pin is available on Header H2 pin 3.

Ports P2.1 and P2.2 are used to monitor the state of the LED2 and LED1, respectively.

The resources used by the application are:

- Timer_A;

- Timer_B;

- Basic Timer1;

- I/O ports;

- FLL+;

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
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
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
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Source:  OpenStax, Teaching and classroom laboratories based on the “ez430” and "experimenter's board" msp430 microcontroller platforms and code composer essentials. OpenStax CNX. May 19, 2009 Download for free at http://cnx.org/content/col10706/1.3
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