Intel 80C196NU, 8XC196NP, Microcontroller manual EPA Capture Event Program

EVENT PROCESSOR ARRAY (EPA)

void poll_epa0()

{

if(checkbit(int_pend, EPA0_INT_BIT))

{

/* Insert user code for event channel 0 here. */

/* Since this event is absolute and re-enabled, no polling is neccessary.*/ clrbit(int_pend, EPA0_INT_BIT);

}

}

void main(void)

{

/* Initialize the timers before using the epa */ init_timer1();

init_epa0();

/* EPA events can be serviced by polling int_pend or epa_pend. */ while(1)

{

poll_epa0();

}

}

10.8.2 EPA Capture Event Program

This example C program demonstrates an EPA capture event. It sets up EPA channel 0 to capture edges (rising and falling) on the EPA0 pin. The program also shows how to set up an the EPA interrupt. You can add your own code for the interrupt service routine.

#pragma model(EX) #include <80c196np.h>

#define	COUNT_ENABLE	0x80
#define	COUNT_UP	0x40
#define	CLOCK_INTERNAL	0x00
#define DIVIDE_BY_1		0x00
#define	CAPTURE	0x00
#define	BOTH_EDGE	0x30
#define	USE_TIMER1	0x00
#define EPA0_INT_BIT		7
void init_epa0()
{
epa0_con = CAPTURE ¦		¦
	BOTH_EDGE
	USE_TIMER1;
setbit(p1_reg, 0); /*		int reg */
setbit(p1_dir, 0); /*		make input	pin	*/
setbit(p1_mode, 0);/*		select EPA	mode	*/
setbit(int_mask, EPA0_INT_BIT);/*			unmask EPA interrupts */
}

#pragma interrupt(epa0_interrupt=EPA0_INT_BIT) void epa0_interrupt()

{

unsigned int time_value;

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