Hugo Pristauz / Mbed 2 deprecated T02_SOS

Tutorial 2 - SOS: This is an embedded program which controls LED1 in order to show a blinking SOS pattern. The tutorial starts to organize helper functions like "morse" in a brick library which will grow and grow with each tutorial. Platform specifics are identified in "bricks/platform.h" by setting proper defines (like LED_INVERTED), which are used to achieve platform independent behaviour. The program has been tested on Nordic nRF51-DK and STM NUCLEO-F303K8, NUCLEO-F401RE and NUCLEO-L476RG.

Dependencies:   mbed

bricks/blink.cpp

Committer:
hux
Date:
2016-12-10
Revision:
1:10299215b49e

File content as of revision 1:10299215b49e:

// blink.cpp - send a morse pattern to LED1
//
// Function morse() is one way for running LED1 with a blinking sequence using
// a busy wait, until the sequence is completed.
//
//    morse(" x xxx x    ");        send one time morse sequence, interval = 0.2
//    morse(" x xxx x    ",0.5);    send one time morse sequence, interval = 0.5
//    

#include "bricks/target.h"
#include "bricks/blink.h"

#ifndef LED_INVERTED
#   define LED_ON  1
#   define LED_OFF 0
#else
#   define LED_ON  0
#   define LED_OFF 1
#endif

   static DigitalOut led(LED1);         // LED1, being used for morse sequence

   void morse(const char *pattern, double interval)
   {
       for (; *pattern; pattern++)
       {
          led = (*pattern == ' ') ? LED_OFF : LED_ON;
          wait(interval);               // busy waiting for interval time
       }
   }