Can someone tell me what's wrong with this? It (or its equivalent) used
to work under the 0.6 version of RTLinux. The symptom is that
intr_hndlr() never gets called.
A little background: The 8255 board is a ComputerBoards DIO-24. Its C0
pin is tied to the IREN pin to enable/disable the IRQ which I have on to
IRQ 3 (since I don't plan to use the ttyS1 port).
I'd appreciate any help. It has me stumped! Please reply directly. I am
not subscribed to the mailing list.
Thanks, Ken
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#include <rtl.h>
#include <rtl_fifo.h>
#include <asm/io.h>
#include "common.h"
unsigned int i3count = 0;
int put_errcnt = 0;
#define DIO_BASE 0x300
#define DIO_PORT(X) (DIO_BASE + (X))
#define DIO_CTRL (DIO_PORT(3))
#define ENA_DIO_IRQ (outb(0, DIO_PORT(2)))
#define DIS_DIO_IRQ (outb(1, DIO_PORT(2)))
unsigned int intr_hndlr(unsigned int irq, struct pt_regs *regs)
{
/* this is the interrupt handler */
++i3count; /* count the interrupt */
if (rtf_put(FIFO_NO, &i3count, sizeof(i3count)) != sizeof(i3count))
++put_errcnt;
rtl_hard_enable_irq(3); /* must re-enable handler */
return 0;
}
int init_module(void)
{
int e;
outb_p(0x98, DIO_CTRL); /* set 8255 mode */
DIS_DIO_IRQ;
if ((e = rtf_create(FIFO_NO, 1000)) != 0) return e;
if ((e = rtl_request_irq(3, intr_hndlr)) != 0) {
rtf_destroy(FIFO_NO);
return e;
}
ENA_DIO_IRQ;
rtl_hard_enable_irq (3); /* and then in RTLinux */
return 0;
}
void cleanup_module(void)
{
rtl_hard_disable_irq(3); /* disable interrupt in RTlinux */
DIS_DIO_IRQ;
rtl_free_irq(3);
rtf_destroy(FIFO_NO);
rtl_printf("i3count=%d, put_errcnt=%d\n", i3count, put_errcnt);
}
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