sampint4.c

上传一个带源代码的嵌入式实时多任务操作系统CMX

#include <reg166.h>
#include <cxfuncs.h>

extern byte t0_cnt;
extern byte go_ahead;
extern char int_mesg;

interrupt( 0x24) void
t4_handler( void )
{
	K_OS_Tick_Update();	/* call the CMX tick function */
	if (go_ahead)	/* see if task has enable message sending */
		{
		if (++t0_cnt == 2)	/* see if count = 2. */
			{
			t0_cnt = 0;			/* reset count */

			/* The following allows an interrupt to use a CMX function, but
				it must use it indirectly. Thus the interrupt must call
				the CMX int_pipe function, which will place the requested
				function and it's parameters into the CMX interrupt pipe
				for later execution. */
				K_Intrp_Mesg_Send(0,&int_mesg);
			}
		}
	T3IC |= 0x80;	/* set flag */
	K_OS_Intrp_Exit();		/* no call right CMX interrupt exit routine. MUST be
							last instruction within interrupt's code */
}