chris stevens / Mbed 2 deprecated Timer_longtimes

Demo program to use the internal timer for long times

Dependencies:   mbed

Fork of Timer_HelloWorld by mbed official

main.cpp@1:455a5cf52a84, 2013-07-25 (annotated)

Committer:
pegcjs
Date:
Thu Jul 25 11:45:33 2013 +0000
Revision:
1:455a5cf52a84
Parent:
0:27e1de20d3cb 
Demo code to use timer to time long times

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:27e1de20d3cb 1 #include "mbed.h"
pegcjs 1:455a5cf52a84 2 // Expanding the TIMER function to allow timing to very long times
pegcjs 1:455a5cf52a84 3 // Demo written for lpc1768 to compare to onboard realtime clock.
pegcjs 1:455a5cf52a84 4 // uses highusecs to encode the top 32 bits of the timer output
pegcjs 1:455a5cf52a84 5 // and an int to uint conversion to get rid of the annoying negative.
pegcjs 1:455a5cf52a84 6
mbed_official 0:27e1de20d3cb 7 Timer t;
pegcjs 1:455a5cf52a84 8
mbed_official 0:27e1de20d3cb 9
mbed_official 0:27e1de20d3cb 10 int main() {
pegcjs 1:455a5cf52a84 11 set_time(1256729737); // Set RTC time to Wed, 28 Oct 2009 11:35:37
pegcjs 1:455a5cf52a84 12 float umax=0,seconds=0;
pegcjs 1:455a5cf52a84 13 unsigned int realusecs=0,oldusecs=0,highusecs=0,minutes=0;;
pegcjs 1:455a5cf52a84 14 int dtime,usecs=0;
pegcjs 1:455a5cf52a84 15
mbed_official 0:27e1de20d3cb 16 t.start();
pegcjs 1:455a5cf52a84 17 usecs=t.read_us();
pegcjs 1:455a5cf52a84 18 realusecs=(unsigned int)usecs;
pegcjs 1:455a5cf52a84 19 time_t rtcstart = time(NULL);
pegcjs 1:455a5cf52a84 20 printf("\n\n\r");
pegcjs 1:455a5cf52a84 21 while(1)
pegcjs 1:455a5cf52a84 22 {
pegcjs 1:455a5cf52a84 23 wait(1);
pegcjs 1:455a5cf52a84 24 oldusecs=realusecs;
pegcjs 1:455a5cf52a84 25 usecs=t.read_us();
pegcjs 1:455a5cf52a84 26 realusecs=(unsigned int)usecs;
pegcjs 1:455a5cf52a84 27 //if(realusecs==0) t.reset(); // timer counts back up to 0 and finishes there
pegcjs 1:455a5cf52a84 28 if(realusecs<oldusecs) { // its rolled over
pegcjs 1:455a5cf52a84 29 highusecs++; // increment highbyte
pegcjs 1:455a5cf52a84 30 }
pegcjs 1:455a5cf52a84 31 seconds=((float)realusecs/1000000.0)+4294.967296*(float)highusecs;
pegcjs 1:455a5cf52a84 32 minutes=(int)(seconds/60);
pegcjs 1:455a5cf52a84 33
pegcjs 1:455a5cf52a84 34 if(umax<realusecs) umax=realusecs;
pegcjs 1:455a5cf52a84 35 time_t rtcsecs = time(NULL);
pegcjs 1:455a5cf52a84 36 dtime=rtcsecs-rtcstart;
pegcjs 1:455a5cf52a84 37 printf("Seconds=%6.2f mins=%d realus=%u hus=%u us=%d rtcs=%d oldusecs=%u \r",seconds,minutes,realusecs,highusecs,usecs,dtime,oldusecs);
pegcjs 1:455a5cf52a84 38
pegcjs 1:455a5cf52a84 39 }
pegcjs 1:455a5cf52a84 40
pegcjs 1:455a5cf52a84 41
mbed_official 0:27e1de20d3cb 42 }