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- 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

what does preconceived mean
sammie Reply
physiological Psychology
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How can I develope my cognitive domain
Amanyire Reply
why is communication effective
Dakolo Reply
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
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Wekolamo
because it helps many people around the world to understand how to interact with other people and understand them well, for example at work (job).
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A child is a member of community not society elucidate ?
JESSY Reply
Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
Simon Reply
compare and contrast skinner's perspective on personality development on freud
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Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
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explain how nature and nurture affect the development and later the productivity of an individual.
Amesalu Reply
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
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Jonathan
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Jonathan
generally amnesi how long yrs memory loss
Kelu Reply
interpersonal relationships
Abdulfatai Reply
What would be the best educational aid(s) for gifted kids/savants?
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treat them normal, if they want help then give them. that will make everyone happy
Saurabh
What are the treatment for autism?
Magret Reply
hello. autism is a umbrella term. autistic kids have different disorder overlapping. for example. a kid may show symptoms of ADHD and also learning disabilities. before treatment please make sure the kid doesn't have physical disabilities like hearing..vision..speech problem. sometimes these
Jharna
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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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