File "iexample.c"

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/*============================================================================
														  Motorola 68HC11
	Demonstrate assigning timer interrupt handler at run time under
	monitor program as well as in rom mode.

	Author:		Dusty Nidey, Axiom Mfg.
	Tools:   	ImageCraft C Compiler V3.5

==============================================================================*/

#include <hc11.h>

// Constants
// Definitions

unsigned char	count4;			// general purpose count byte
unsigned char	timeout1;		// general purpose timeout. incriments every .03277 seconds


// these functions only used for debugging in Buffalo Monitor
// they can be safely removed for production, or left in
void break1(){
	asm("bh1:	nop");
}

/*  TimeHandle - Interrupt Handler routine
	Gets executed on Timer1 overflow flag, which is set to default prescaler
	of over 32.77ms
*/
#pragma interrupt_handler TimeHandle
void TimeHandle(){
	TFLG2 = 0x80;		// clear timer overflow flag
	// if timer overflow.
	// here every 32.77ms or .03277 seconds
	++timeout1;	// incriment timeout counter
	if(rtimeout < R_TIMEOUT)	++rtimeout;	// incriment timeout counter
	if(++count4 > 15){	// if time to update counters
		// here every .49155 seconds
		count4=0;
	}

}

/* RESET - MAIN
   After executing STARTUP code on reset, execution begins here
*/
main(){
	asm("	sei");	// disable interrupts


	// FOR BUFFALO MODE ONLY - setup pseudo-interrupt vectors, uncomment this
	// For EEPROM mode, use the interrupt vectors table at the end of this file
//	*(void(**)())0xD1 = TimeHandle;	// Timer Overflow	$00DO-$00D2


	TCTL2 = 0x06;   // enable input capture for A0 and A1
	TFLG1 = 0x01;	// clear input capture flag - IDLE
	TMSK2 = 0x80;   // enable timer interrupts
	TFLG2 = 0x80;	// clear timer overflow flag

	asm("	cli");	// enable interrupts

	// reset all counters
	count4=0;

	// MAIN LOOP begins .. endless
	for( ; ;){
	}
}


// Buffalo Debugger routine to send a HEX formatted byte to the COM1 terminal
void sendbyte(unsigned char byt4){
	dummy1 = byt4;
	asm("	ldaa	_dummy1");
	asm("	jsr		0xFFB2");
	asm("	ldaa	_dummy1");
	asm("	jsr		0xFFB5");
}


/*---------------------------------------------------------------- */
/* REMOVE the following if running this under the Buffalo Debugger */


extern void _start();	/* entry point in crt11.s */

#pragma abs_address:0xffd6
/* change the above address if your vector starts elsewhere
 */
void (*interrupt_vectors[])() =
	{
	/* to cast a constant, say 0xb600, use
	   (void (*)())0xb600
	 */
	/* all interrupts reset the processor, which is probably not what
	 * you want */
	_start,	/* SCI */
	_start,	/* SPI */
	_start,	/* PAIE */
	_start,	/* PAO */
	TimeHandle,	/* TOF */
	_start,	/* TOC5 */
	_start,	/* TOC4 */
	_start,	/* TOC3 */
	_start,	/* TOC2 */
	_start,	/* TOC1 */
	_start,	/* TIC3 */
	_start,	/* TIC2 */
	_start,	/* TIC1 */
	_start,	/* RTI */
	_start,	/* IRQ */
	_start,	/* XIRQ */
	_start,	/* SWI */
	_start,	/* ILLOP */
	_start,	/* COP */
	_start,	/* CLM */
	_start	/* RESET */
	};
#pragma end_abs_address