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// Copyright 2003-2009, various authors
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
/*
extint.c
External interrupt handler for parallel port interrupts. To trigger
this, physically toggle the interrupt pin on the parallel port.
*/
#include "rtapi.h"
#include "rtapi_app.h"
#define PARPORT_BASE_ADDRESS 0x378
#define PARPORT_IRQ 7
static int module = 0; /* the module ID */
static int timer_count = 0; /* the output variable */
static void parport_irq_handler(void)
{
timer_count++;
rtapi_enable_interrupt(PARPORT_IRQ);
return;
}
int rtapi_app_main(void)
{
int retval;
module = rtapi_init("EXTINT");
if (module < 0) {
rtapi_print("extint init: rtapi_init returned %d\n", module);
return -1;
}
/* set up ISR */
retval = rtapi_irq_new(PARPORT_IRQ, module, parport_irq_handler);
if (retval < 0) {
rtapi_print("extint init: rtapi_irq_new returned %d\n", retval);
return -1;
}
retval = rtapi_enable_interrupt(PARPORT_IRQ);
if (retval < 0) {
rtapi_print("extint init: rtapi_enable_interrupt returned %d\n",
retval);
return -1;
}
/* enable parallel port hardware interrupts */
rtapi_outb(rtapi_inb(PARPORT_BASE_ADDRESS + 2) | 0x10,
PARPORT_BASE_ADDRESS + 2);
return 0;
}
void rtapi_app_exit(void)
{
int retval;
/* disable parallel port hardware interrupts */
rtapi_outb(rtapi_inb(PARPORT_BASE_ADDRESS + 2) & (~0x10),
PARPORT_BASE_ADDRESS + 2);
/* clear ISR */
retval = rtapi_disable_interrupt(PARPORT_IRQ);
if (retval < 0) {
rtapi_print("extint exit: rtapi_disable_interrupt returned %d\n",
retval);
return;
}
retval = rtapi_irq_delete(PARPORT_IRQ);
if (retval < 0) {
rtapi_print("extint exit: rtapi_irq_delete returned %d\n", retval);
return;
}
rtapi_print("extint exit: interrupt count is %d\n", timer_count);
retval = rtapi_exit(module);
if (retval < 0) {
rtapi_print("extint exit: rtapi_exit returned %d\n", retval);
return;
}
}
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