Dear Patrick,
I have tested the following code on a 486 machine (I'm using IRQ
10). This is a small modification of examples/sound/sound.c file.
/*******************************************************************/
#include <linux/mc146818rtc.h>
#include <rtl_fifo.h>
#include <rtl_core.h>
#include <rtl_time.h>
#include <rtl.h>
#include "PCL_225.h"
unsigned long i,j=0;
/* Interrupt handler - called when ever IRQ 10 is pulled low, and if it is
enabled */
unsigned int intr_handler(unsigned int irq, struct pt_regs *regs) {
int dat;
(void) CMOS_READ(RTC_REG_C); /* clear IRQ */
j++;
for(i=0;i<4097;i++)
{
outb_p(0x01,CHIP5_PORT_A);
outb_p(0x00,CHIP5_PORT_A);
}
rtl_hard_enable_irq(10);
return 0;
}
/* this gets inserted when ever insmod is issued */
int init_module(void)
{
/* Initializations */
outb_p(0x80,CONTROL_PORT_CHIP5);/* first 8255, all output ports */
outb_p(0x00,CHIP5_PORT_A);
/* Tell the kernel to branch to function intr_handler(), when ever IRQ 10
occurs. In my PC IRQ 10 line has to be pulled low */
rtl_request_irq(10, intr_handler);
rtl_hard_enable_irq(10);
(void) CMOS_READ(RTC_REG_C);
rtl_printf("intr module loaded...\n");
return 0;
}
/* Following gets executed whenever rmmod is issued */
void cleanup_module(void)
{
rtl_free_irq(10);
rtl_printf("intr module removed...%u\n",j);
}
/*************************************************************************/
> > I have an ISA board using interrupt 5. I am trying to set up an interrupt
> > handler for this board that uses system interrupt 13. The following code
> > was used to do this in dos.
> >
> > /* Port addresses for the 8259A interrupt controller */
> >
> > #define INT_MASK_PORT 0x0021
> > #define INT_CONTROLLER 0x0020
> > #define SPECIFIC_EOI_IR5 0x0065
> >
> > /******************************************************/
> >
> > void interrupt HS_Int_Handler (...) {
> > .
> > .
> > handler code
> > .
> > .
> > }
> >
> > Orig_Int_13_Handler = dos_getvect (13);
> > _dos_setvect (13, HS_Int_Handler);
> > outportb (INT_MASK_PORT, inportb (INT_MASK_PORT) & ~IRQ_5);
> > outportb (INT_CONTROLLER, SPECIFIC_EOI_IR5);
> > _enable();
> > .
> > .
> > .
> > collect data
> > .
> > .
> > .
> > //Disable interrupt from HS
> > outportb (INT_MASK_PORT, inportb (INT_MASK_PORT) | IRQ_5);
> > _dos_setvect (13, Orig_Int_13_Handler);
> > outportb(INT_CONTROLLER, SPECIFIC_EOI_IR5);
> > _enable
> >
> > How do I do this in rtlinux??
> >
> > Thanks for any help,
> > Patrick
> > -- [rtl] ---
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> > ---
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> > http://www.rtlinux.org/rtlinux/
***********************************************************************
*
RAMESH K, Receiver Engineer *
Millimeterwave Observatory Ph: +91-80-3340128 ext 447 *
Raman Research Institute Fax: +91-80-3340492 Attn Ramesh K *
Sir C V Raman Avenue *
Sadashivanagar *
Bangalore - 560 080 *
India *
http://www.rri.res.in *
*
***********************************************************************
-- [rtl] ---
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---
For more information on Real-Time Linux see:
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