main.cpp

00001 //This is a mercury test
00002 
00003 #include "mbed.h"
00004 #include "FastPWM.h"
00005 
00006 FastPWM pwm(PTA13);
00007 InterruptIn interrupt(PTD5);
00008 
00009 volatile int count;
00010 
00011 void interrupt_handler(void)
00012 {
00013     count++;
00014 }
00015 
00016 
00017 int main (void)
00018 {
00019     //Start_frequency is 60kHz
00020     double frequency = 65e3;
00021     pwm = 0;
00022     interrupt.rise(&interrupt_handler);
00023 
00024     while(1) {
00025         //Set PWM period, reset count
00026         pwm.period(1/frequency);
00027         count = 0;
00028 
00029         //Enable PWM at 50% dutycycle for 1 second
00030         pwm = 0.5;
00031         wait(1);
00032         pwm = 0;
00033 
00034         printf("Expected %.0f edges, measured %d edges.\n", frequency, count);
00035         if (count < frequency * 0.9) {
00036             printf("Test failed at %.0fkHz!\n\n", frequency / 1000);
00037             break;
00038         }
00039         printf("Test succeeded at %.0fkHz!\n\n", frequency / 1000);
00040         frequency += 10e3;
00041 
00042     }
00043     while(1);
00044 }
00045