counting_task.cpp

00001 /**
00002  * This task do a binary count on the 4 mbed LEDs
00003  *
00004  * Author: Jacob Baungard Hansen
00005  */
00006 
00007 #include "counting_task.h"
00008 
00009 /**
00010  *
00011  * @param starting_offset       when the task should but run first
00012  * @param frequency_ms          the frequency in ms of how often the task should run
00013  */
00014 CountingTask::CountingTask(int starting_offset, int frequency_ms)
00015                                     : Task(starting_offset, frequency_ms) {
00016                                         
00017   this->count = 0;
00018 
00019     this->led1 = new DigitalOut(LED1);
00020     this->led2 = new DigitalOut(LED2);
00021     this->led3 = new DigitalOut(LED3);
00022     this->led4 = new DigitalOut(LED4);
00023     
00024 
00025 }
00026 
00027 CountingTask::~CountingTask() {
00028     delete this->led1;
00029     delete this->led2;
00030     delete this->led3;
00031     delete this->led4;
00032 }
00033 
00034 /** 
00035  * The function that is run at the specified frequency.
00036  */
00037 void CountingTask::action() {
00038 
00039   // simple way to get the bits
00040     std::bitset<4> bits(this->count);
00041     
00042     // set the result
00043     this->led1->write(bits[3]);
00044     this->led2->write(bits[2]);
00045     this->led3->write(bits[1]);
00046     this->led4->write(bits[0]);
00047     
00048     // don't overflow
00049     this->count = (this->count+1) % 16;
00050 
00051 }