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stm32bringup/uptime.c

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/* uptime.c -- tells how long the system has been running */
/* Copyright (c) 2020 Renaud Fivet */
#include <stdio.h>
#include "system.h" /* uptime, yield() */
static void display( unsigned u, const char *s) {
if( u)
printf( " %d %s%s", u, s, &"s"[ u <= 1]) ;
}
int main( void) {
static unsigned last ;
for( ;;)
if( last != uptime) {
unsigned w, d, h, m ,s ;
last = uptime ;
d = h = m = 0 ;
s = last % 60 ;
w = last / 60 ;
if( w) {
m = w % 60 ;
w /= 60 ;
if( w) {
h = w % 24 ;
w /= 24 ;
if( w) {
d = w % 7 ;
w /= 7 ;
}
}
}
printf( "up") ;
display( w, "week") ;
display( d, "day") ;
display( h, "hour") ;
display( m, "minute") ;
display( s, "second") ;
printf( "\n") ;
} else
yield() ; /* Wait for System Tick Interrupt */
}
/* end of uptime.c */