main.cpp

00001 /* Test of FRDM-KL25z RGB LED and Serial out to PC.
00002  * This program blinks the LED through the series of colors
00003  * red, greeen, and blue, displaying each for 1 second, with
00004  * a 1 second off period between each color. As it makes each 
00005  * change in the status of the LED, it sends a message to the 
00006  * pc serial port over the USB programming connection. The 
00007  * pattern repeats 5 times, then two short white flashes are 
00008  * displayed by turning all threee LEDs on and off at once, and
00009  * a final message is sent to the serial port.
00010  *
00011  * Tested from OSX 10.8.4. To find the serial port device, 
00012  * launch Terminal, then type:
00013  * 
00014  * ls /dev/tty.usbmodem* 
00015  *
00016  * It will return something like /dev/tty.usbmodem1d22
00017  * To change Terminal to connect to the serial port, use the screen
00018  * command, specifying the path returned by ls and the baud rate:
00019  *
00020  * screen /dev/tty.usbmodem1d22 9600
00021  * 
00022  * As a shortcut, if you have just one serial device connected, you
00023  * can skip the first command and type the second command as far as 
00024  * tty.usb and hit the tab key and it will autocomplete. 
00025  * Once screen is running, type Ctrl-a then ? for a list of available 
00026  * commands.
00027  */
00028  
00029 #include "mbed.h"
00030 
00031 DigitalOut redLED(LED_RED);               // Define digital outputs for each LED color
00032 DigitalOut greenLED(LED_GREEN);
00033 DigitalOut blueLED(LED_BLUE);
00034 Serial pc(USBTX, USBRX);                  // Declare the serial port
00035 
00036 int main() {
00037     pc.baud (9600);                       // Set the baud rate for the serial connection
00038     redLED = 1;                           // This a common anode RGB LED, with the anodes connected
00039     greenLED = 1;                         // to 1. Thus, to turn a color off you counterintuitively set
00040     blueLED = 1;                          // it to 1, so there is no voltage difference across the LED
00041     for (int i = 1; i <= 5; i++) {        // Do 5 times:
00042        redLED = 0;                        // Turn the red LED on
00043        pc.printf("Red LED ON \n\r");      // Send a status message
00044        wait(1.0);                         // Wait 1.0 seconds
00045        redLED = 1;                        // Turn the red LED off
00046        pc.printf("Red LED OFF \n\r");     // Send a status message
00047        wait(1.0);                         // Wait 1.0 seconds
00048        greenLED = 0;                      // Repeat the above for the green LED
00049        pc.printf("Green LED ON \n\r"); 
00050        wait(1.0);
00051        greenLED = 1;
00052        pc.printf("Green LED OFF \n\r");
00053        wait(1.0);
00054        blueLED = 0;                       // Repeat for the blue LED
00055        pc.printf("Blue LED ON \n\r"); 
00056        wait(1.0);
00057        blueLED = 1;
00058        pc.printf("Blue LED OFF \n\r");
00059        wait(1.0);
00060    }
00061    redLED = greenLED = blueLED = 0;       // Give a short double-flash of white
00062    wait(0.25);
00063    redLED = greenLED = blueLED = 1;
00064    wait(0.25);
00065    redLED = greenLED = blueLED = 0;
00066    wait(0.25);
00067    redLED = greenLED = blueLED = 1;       // Leave the LED off at the end
00068    pc.printf("Goodbye \n\r");             // Send a farewell message  
00069 }