main.cpp

00001 // Example running the mbed Tickers at a lower priority
00002 
00003 #include "mbed.h"
00004 
00005 volatile int counter = 0;
00006 void timing_critical() {
00007     counter++;
00008 }
00009 
00010 void long_event() {
00011     wait_ms(50);
00012 }
00013 
00014 PwmOut out(p25);
00015 InterruptIn in(p26);
00016 Ticker tick;
00017 
00018 int main() {
00019     out.period_ms(10);
00020     out.pulsewidth_ms(5);
00021     in.rise(&timing_critical);
00022 
00023     printf("1) InterruptIn only...\n");    
00024     for(int i=0; i<5; i++) {
00025         counter = 0;
00026         wait(1);
00027         printf("counts/sec = %d\n", counter);
00028     }
00029 
00030     tick.attach(&long_event, 0.1);    
00031     
00032     printf("2) InterruptIn plus long running occasional ticker event...\n");    
00033     for(int i=0; i<5; i++) {
00034         counter = 0;
00035         wait(1);
00036         printf("count/sec = %d\n", counter);
00037     }
00038     
00039     printf("3) InterruptIn plus long running occasional ticker event at lower priority...\n");    
00040     NVIC_SetPriority(TIMER3_IRQn, 255); // set mbed tickers to lower priority than other things
00041     for(int i=0; i<5; i++) {
00042         counter = 0;
00043         wait(1);
00044         printf("counter = %d\n", counter);
00045     }
00046 }