clock.c

一个小型化的嵌入式实时操作系统源代码

/*
; ---------------------------------------------------------------------
; File:        clock.c
;
; uC/OS Real-time multitasking kernel for the MIPS processor.
;
; Interrupt test - uses loop in main() to print out a clock display
;
; Created by Brad Denniston, Viewpoint Engineering ([e-mail])
; ---------------------------------------------------------------------
*/

#include	"ucos.h"
#include	"cpu.h"

OS_TCB	*OSTCBCur;
OS_TCB	*OSTCBHighRdy;

static uint OSTime = 0;
static uint	OSIntNesting = 0;

/*
; ---------------------------------------------------------------
 * Main function.
; ---------------------------------------------------------------
 */
int
main(int argc, char **argv)
{
	uint	milliseconds;
	uint	seconds;
	uint	minutes;
	uint	hours;


	ENTER_CRITICAL();
	CPUInit();
	EXIT_CRITICAL();

	for( ;; ) {
		milliseconds = OSTimeGet();
		seconds = milliseconds/20;
		minutes = seconds/60;
		hours =  minutes/60;
		milliseconds -= seconds * 20;
		seconds -= minutes * 60;
		minutes -= hours * 60;
		printf( "%d:%d:%d.%d\r", hours, minutes, seconds, milliseconds);
	}
} /* main */

void OSTimeTick()
{
	OSTime++;
}

OSIntExit()
{
	OSIntNesting--;
	return( FALSE );
}

uint OSTimeGet()
{
	return( OSTime );
}