Lab 8
Gettings Started with the MSP430 - Using Energia (Arduino) 8 - 21
2. Examine the code.
Looking at the Blink sketch, we see the code we quickly examined during our chapter
discussion. This code looks very much like standard C code. (In Lab8d we examine some of
the specific differences between this sketch and C code.)
At this point, due to their similarity to standard C language code, we will assume that you
recognize most of the elements of this code. By that, we mean you should recognize and
understand the following items:
#define – to declare symbols
Functions – what a function is, including: void, () and {}
Comments – declared here using // characters
What we do want to comment on is the names of the two functions defined here:
setup(): happens one time when program starts to run
loop(): repeats over and over again
This is the basic structure of an Energia/Arduino sketch. Every sketch should have – at the
very least – these two functions. Of course, if you don’t need to setup anything, for example,
you can leave it empty.
/*
Blink
Turns on an LED on for one second, then off for one second,
repeatedly. This example code is in the public domain.
*/
void setup () {
// initialize the digital pin as an output.
// Pin 14 has an LED connected on most Arduino boards:
pinMode (RED_LED, OUTPUT);
}
void loop () {
digitalWrite (RED_LED, HIGH); // turn on LED
delay (1000); // wait one second (1000ms)
digitalWrite (RED_LED, LOW); // turn off LED
delay (1000); // wait one second
}
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