Pulse.cpp

00001 
00002 #include "Pulse.h"
00003 #include "mbed.h"
00004 
00005     Pulse::Pulse(PinName pin) : output_pin(pin) {
00006         output_pin = 0; 
00007         switch_state = false;
00008         oscilation = 38400; //Set default oscilation to 38.4KHz
00009     }
00010 
00011     void Pulse::send_pulse(int* sequence){
00012         int num_switches = (sizeof(sequence)/sizeof(int));
00013         int tick = 1000000/oscilation;
00014         for(int i = 0; i < num_switches; i++){
00015             if(i % 2 == 0){
00016                 change_state();
00017                 output_pin = 1;
00018                 flipper.attach_us(this, &Pulse::flip_pin, tick);
00019                 wait_us(sequence[i]);
00020                 flipper.detach();
00021                 change_state();
00022                 output_pin = 0;
00023             }else{
00024                 wait_us(sequence[i]);
00025             }
00026         }
00027     }
00028     
00029     void Pulse::set_osc(int khz){
00030         if(khz > 0 && khz <= 250000) //Make sure that the new oscilation is positive and also less than 250KHz 
00031             oscilation = khz;
00032     }
00033     
00034     void Pulse::set_pin(PinName pin){
00035         output_pin = pin;
00036     }
00037             
00038     void Pulse::flip_pin(){
00039         if(switch_state) //Stop the output from switching unless it is meant to be transmitting
00040             output_pin = !output_pin;
00041         else
00042             output_pin = 0;
00043     }
00044 
00045     void Pulse::change_state(){
00046         switch_state = !switch_state;
00047     }
00048 
00049 
00050