34 lines
653 B
C
34 lines
653 B
C
/* uptime.1.c -- tells how long the system has been running
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** Copyright (c) 2020 Renaud Fivet
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**
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** v1 displays the number of seconds elapsed since boot
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*/
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#include <stdio.h>
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extern volatile unsigned uptime ;
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extern void kputc( unsigned char c) ;
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void kputu( unsigned u) {
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unsigned r = u % 10 ;
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u /= 10 ;
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if( u)
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kputu( u) ;
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kputc( '0' + r) ;
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}
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int main( void) {
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static unsigned last ;
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for( ;;)
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if( last != uptime) {
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last = uptime ;
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kputu( last) ;
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puts( " sec") ;
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} else
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__asm( "WFI") ; /* Wait for System Tick Interrupt */
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}
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/* end of uptime.1.c */
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