main.cpp

00001 
00002 #include "mbed.h"
00003 #include "Timer2.h"
00004 #include "Timer3.h"
00005 /*
00006     Connect P8 (MAT2.0) to P16 (CAP3.1)
00007     Connect external input on P15 (CAP3.0) to PWM output on P26
00008 */
00009 Serial pc(USBTX, USBRX); // tx, rx
00010 DigitalOut out1(p5), out2(p6);
00011 PwmOut pw(p26);
00012 
00013 int done;
00014 void Timer3Isr(int count)
00015 {
00016     pc.printf("count=%d\n\r", count);
00017     LPC_TIM2->TCR = 2;  // Disable Timer2
00018     done = 1;
00019 }
00020 
00021 void Timer2Isr(void)
00022 {
00023     out1 = !out1;
00024 }
00025 
00026 int main(void)
00027 {
00028 int prescale;   // Units are 0.1 second.
00029 
00030     out1 = 0;
00031     out2 = 0;
00032     pw.period_us(10);
00033     pw.write(0.5);
00034     Timer3_init(Timer3Isr);
00035     Timer2_init(Timer2Isr);
00036     while(1)
00037     {
00038         pc.printf("PS: ");
00039         pc.scanf("%d", &prescale);      // Interval is <prescale>+1 * 0.1 second.
00040         pc.printf("%d\n\r", prescale);
00041         done = 0;
00042         Timer2_start(prescale);
00043         while (!done)
00044             out2 = !out2;
00045     }
00046 }
00047 
00048