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Lab Debrief

8 - 38 Gettings Started with the MSP430 - Using Energia (Arduino)

Q&A: Lab8B (1)

2. Try out the sketch.

When you push the button the (GREEN or RED) LED goes (ON or OFF)?

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Examine the code

3. How is the LED defined differently in the ‘Button’ Sketch versus the ‘Blink’ sketch?

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4. How is the pushbutton created/used differently from the LED?

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What “Energia” pin is the button connected to? _______________________________

What is the difference between INPUT and INPUT_PULLUP?

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Green LED goes OFF

In ‘Blink’, the LED was #defined (as part of Energia);

in ‘Button’, it was defined as a const integer. Both work equally well.

In Setup() it is configured as an ‘input’; in loop() we use digitalRead()

P1_1

INPUT config’s the pin as a simple input – e.g. allowing you to read pushbutton.

Using INPUT_PULLUP config’s the pin as an input with a series pullup resitor;

(many TI C provide these resistors as part of their hardware design).

Q&A: Lab8B (2)

5. Just like standard C code, we can create variables. What is the global variable used

for in the ‘Button’ example?

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What would be a more efficient way to handle responding to a pushbutton? (And why

would this be important to many of us MSP430 users?)

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(Note, we will look at this later.)

Reverse Button/LED action

8. Did it work? _________________

‘buttonState’ global variable holds the value of the button returned by digitalRead().

We needed to store the button’s value to perform the IF-THEN/ELSE command.

It would be more efficient to let the button ‘interrupt’ the processor, as opposed to

reading the button over and over again. This is as the processor cannot SLEEP

while polling the pushbutton pin. If using an interrupt, the processor could sleep until

being woken up by a pushbutton interrupt.

Yes (it should)

Texas Instruments MSP430 Student Guide

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