friendly_launchpad

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Friendly Launchpad Chris Hulbert [email protected] http://github.com/chrishulbert/friendly_launchpad

This is my attempt at making the MSP430 Launchpad as simple to program as the Arduino.

• This will hopefully work with your compiler, but it is designed to compile using the toolchain from http://code.google.com/p/osx-launchpad/
• You will want to add '-std=gnu99' to your CFLAGS in your makefile too.

Very simple example:

#include "../friendly_launchpad/friendly_launchpad.h"

void setup() {
  // initialize the red led as output
  pinMode(10, OUTPUT);
  // initialize the green led as output
  pinMode(16, OUTPUT);
}

void loop() {
  // Flash the lights
  digitalWrite(10, HIGH);  
  digitalWrite(16, LOW);
  delay(500);
  digitalWrite(10, LOW);  
  digitalWrite(16, HIGH);
  delay(500);
}

Another example:

#include "../friendly_launchpad/friendly_launchpad.h"

/*
  Button
 
 Turns on and off a light emitting diode(LED) connected to digital  
 pin 13, when pressing a pushbutton attached to pin 2. 
 
 
 The circuit:
 * LED attached from pin 13 to ground 
 * pushbutton attached to pin 2 from +5V
 * 10K resistor attached to pin 2 from ground
 
 * Note: on most Arduinos there is already an LED on the board
 attached to pin 13.
 
 
 created 2005
 by DojoDave <http://www.0j0.org>
 modified 28 Oct 2010
 by Tom Igoe
 Modified 7 Mar 2011 by Chris Hulbert to suit friendly launchpad
 
 This example code is in the public domain.
 
 http://www.arduino.cc/en/Tutorial/Button
 */

// constants won't change. They're used here to 
// set pin numbers:
const int buttonPin = 13;     // the number of the pushbutton pin
const int ledPin =  10;      // the number of the LED pin
const int ledPin2 =  16;      // the number of the LED pin

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);      
  pinMode(ledPin2, OUTPUT);      
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);     
}

void loop(){
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH) {     
    // turn LED on:    
    digitalWrite(ledPin, HIGH);
    digitalWrite(ledPin2, LOW);
  } 
  else {
    // turn LED off:
    digitalWrite(ledPin, LOW); 
    digitalWrite(ledPin2, HIGH);
  }
}

Another example:

#include "../friendly_launchpad/friendly_launchpad.h"

/*
  State change detection (edge detection)
  
 Often, you don't need to know the state of a digital input all the time,
 but you just need to know when the input changes from one state to another.
 For example, you want to know when a button goes from OFF to ON.  This is called
 state change detection, or edge detection.
 
 This example shows how to detect when a button or button changes from off to on
 and on to off.
  
 The circuit:
 * pushbutton attached to pin 2 from +5V
 * 10K resistor attached to pin 2 from ground
 * LED attached from pin 13 to ground (or use the built-in LED on
   most Arduino boards)
 
 created  27 Sep 2005
 modified 14 Oct 2010
 by Tom Igoe
 modified 7 Mar 2011 by Chris Hulbert to suit Friendly Launchpad

This example code is in the public domain.
  
 http://arduino.cc/en/Tutorial/ButtonStateChange
 
 */

// this constant won't change:
const int  buttonPin = 13;    // the pin that the pushbutton is attached to
const int ledPin = 16;       // the pin that the LED is attached to

// Variables will change:
int buttonPushCounter = 0;   // counter for the number of button presses
int buttonState = 0;         // current state of the button
int lastButtonState = 0;     // previous state of the button

void setup() {
  // initialize the button pin as a input:
  pinMode(buttonPin, INPUT);
  // initialize the LED as an output:
  pinMode(ledPin, OUTPUT);
}


void loop() {
  // read the pushbutton input pin:
  buttonState = digitalRead(buttonPin);

  // compare the buttonState to its previous state
  if (buttonState != lastButtonState) {
    // if the state has changed, increment the counter
    if (buttonState == HIGH) {
      // if the current state is HIGH then the button
      // wend from off to on:
      buttonPushCounter++;
    } 
    else {
      // if the current state is LOW then the button
      // wend from on to off:
    }
  }
  // save the current state as the last state, 
  //for next time through the loop
  lastButtonState = buttonState;

  
  // turns on the LED every four button pushes by 
  // checking the modulo of the button push counter.
  // the modulo function gives you the remainder of 
  // the division of two numbers:
  if (buttonPushCounter % 4 == 0) {
    digitalWrite(ledPin, HIGH);
  } else {
   digitalWrite(ledPin, LOW);
  }
  
}