<< Chapter < Page Chapter >> Page >
Using the MSP-EXP430FG4618 Development Tool establish a data exchange between the MSP430FG4618 and MSP430F2013 devices using the SPI mode. The MSP430FG4618 uses the USCI module while the MSP430F2013 uses the USI module.

Laboratory communications: lab2 - echo test using spi

Introduction

The MSP430 contains built-in features for both parallel and serial data communication. This chapter describes the operation of these peripherals, and discusses the protocols, data formats and specific techniques for each type of data communication.

The communication modules available for the MSP430 family of microcontrollers are USART (Universal Synchronous/Asynchronous Receiver/Transmitter), USCI (Universal Serial Communication Interface) and USI (Universal Serial Interface). These provide asynchronous data transmission between the MSP430 and other peripheral devices when configured in UART mode. They also support data transmission synchronized to a clock signal through a serial I/O port in Serial Peripheral Interface (SPI) and Inter Integrated Circuit (I2C) modes.

Overview

This laboratory explores the USCI and USI communication interfaces in SPI mode. The MSP430 devices included on the Experimenter’s board will exchange messages between themselves, one being the MSP430FG4618 (master) that will control operation of the other MSP430F2013 device (slave). The master, by reading the current state of the slave, will drive the slave to the new desired state, controlling its activity. In this particular case, switching the state of LED3 will be implemented.

Resources

This laboratory uses the USCI module of the MSP430FG4618 device and the USI module included on the MSP430F2013. Both units operate in SPI mode.

The Basic Timer1 of the master device is programmed to switch the status of the slave device once every 2 seconds.

The slave is notified of the arrival of information through the counting end interrupt of the USI module.

The resources used are:

- USCI module;

- USI module;

- Basic Timer1;

- Interrupts;

- I/O ports.

Software application organization

The software architecture for this laboratory is shown in Figure 1.

The master unit is composed of two software modules ( Lab2_Comm_1.c ):

- The "Main master task" module contains the operation algorithm of master unit;

- The "ISR Basic Timer" module wakes the "Main master task" once every 2 seconds.

The slave unit is also composed of two modules ( Lab2_Comm_2.c ):

- The "Main slave task" module contains the operation algorithm of the slave unit;

- The "USI ISR" module reads the data received, prepares the USI module for new reception and wakes the "Main slave task" to execute the algorithm associated with the reception of the new command.

Software architecture

System configuration

Usci_b (master) control registers configuration

The SPI connection will operate in the following mode:

- Clock phase ->Data value is updated on the first UCLK edge and captured on the following edge;

- Clock polarity ->the inactive state is low;

- MSB first;

- 8-bit data;

- Master mode;

Questions & Answers

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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Teaching and classroom laboratories based on the “ez430” and "experimenter's board" msp430 microcontroller platforms and code composer essentials' conversation and receive update notifications?

Ask