<< Chapter < Page Chapter >> Page >

- 3-Pin SPI;

- Source clock ->SMCLK.

The following control registers are configured based on these characteristics:

UCB0CTL0 = 0x29; //UCB0CTL0 =// UCCKPH|UCCKPL|UCMSB|UC7BIT|UCMST|UCMODEx|UCSYNC| //UCCKPH (Clock phase) = 0b ->Data is changed on the // first UCLK edge and captured on the following edge.//UCCKPL (Clock polarity) = 0b ->Inactive state is low //UCMSB (MSB first select) = 1b ->MSB first //UC7BIT (Character length) = 0b ->8-bit data //UCMST (Master mode) = 1b ->Master mode //UCMODEx (USCI mode) = 00b ->3-Pin SPI //UCSYNC (Synch. mode enable) = 1b ->Synchronous modeUCB0CTL1 = 0x81; //UCB0CTL1 =// UCSSELx | Unused |UCSWRST| //UCSSELx (USCI clock source select)= 10b ->SMCLK //UCSWRST (Software reset) = 1b ->normally set by a PUC

Data rate usci_b (master)

The system clock is configured to operate with a frequency of ~ 1048 kHz from the DCO. This frequency will be the working base frequency of the USCI module. The connection operates at a clock frequency of ~ 500 kHz. Configure the following registers:

UCB0BR0 = 0x02; UCB0BR1 = 0x00;// DATA RATE // Data rate = SMCLK/2 ~= 500kHz// UCB0BR1 = 0x00&UCB0BR0 = 0x02

Port configuration usci_b (master)

In order to set the external interfaces at the USCI module, it is necessary to configure the I/O ports. Select the USCI peripheral in SPI mode, matching the connections provided at the Experimenter’s board:

P3SEL |= 0x0E; // P3.3, P3.2, P3.1 option select

Usi (slave) control registers configuration

The SPI connection will operate on the following mode:

- MSB first;

- 8-bit data.

- Slave mode;

- Clock phase ->Data is changed on the first SCLK edge and captured on the following edge;

- USI counter interrupt enable.

The following control registers are configured based on these characteristics:

USICTL0 = 0xE3; //USICTL0 =//USIPE7|USIPE6|USIPE5|USILSB|USIMST|USIGE|USIOE|USISWRST //USIPE7 (USI SDI/SDA port enable) = 1b ->USI enabled //USIPE6 (USI SDO/SCL port enable) = 1b ->USI enabled //USIPE5 (USI SCLK port enable) = 1b ->USI enabled //USILSB (LSB first) = 0b ->MSB first //USIMST (Master) = 0b ->Slave mode //USIGE (Output latch control) = 0b ->Output latch // enable depends on shift clock//USIOE (Serial data output enable) = 1b->Output enable //USISWRST (USI software reset) = 1b ->Software resetUSICTL1 = 0x10; //USICTL1 =//USICKPH|USII2C|USISTTIE|USIIE|USIAL|USISTP|USISTTIFG|USIIFG //USICKPH (Clock phase select) = 0b ->Data is changed // on the first SCLK edge and captured on the following edge//USII2C (I2C mode enable) = 0b ->I2C mode disabled //USISTTIE (START condition interrupt) = 0b ->Not used //USIIE (USI counter) = 1b ->Interrupt enabled //USIAL (Arbitration lost) = 0b ->Not used //USISTP (STOP condition received) = 0b ->Not used //USISTTIFG (START condition int. flag) = 0b ->Not used //USIIFG (USI counter int. flag) = 0b ->No int. pending

Analysis of operation

Once the USCI module is configured in accordance with the previous steps, initiate the experiment with the files Lab2_Comm_1.c (master – MSP430FG4618) and Lab2_Comm_2.c (slave – MSP430F2013), compiling them and running them on the Experimenter’s board.

For this laboratory, it is necessary to set the following jumper settings:

- PWR1/2, BATT, LCL1/2, JP2;

- SPI: H1- 1&2, 3&4, 5&6, 7&8.

Once the program code is running in the two microcontrollers, monitor LED3 on the Experimenter’s board. It will blink with a period of 4 seconds.

This example and many others are available on the MSP430 Teaching ROM.

Request this ROM, and our other Teaching Materials here (External Link)

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
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
what is system testing
what is the application of nanotechnology?
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
anybody can imagine what will be happen after 100 years from now in nano tech world
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
QuizOver.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?