[공부중] OS Timer 예제 - interrupt

timer 예제

#include <asm/arch/irqs.h> // IRQ_OST1

#include <asm/hardware.h> // OIER_E1, ...

#include <asm/arch/pxa-regs.h>  // OIER, ...

/* TIMER */

#define OST1_TIMER_ON OIER |= OIER_E1; OSSR |= OSSR_M1; OSMR1 = OSCR+timerClkVal

#define OST1_TIMER_OFF OIER &= ~OIER_E1; OSSR |= OSSR_M1

#define SEC_CLK 3686400

static int timerPeriod=1, timerClkVal=1*SEC_CLK;

/* interrupt callback */

void ost1_interrupt(int irq, void *dev_id, struct pt_regs *regs) {

printk("os timer1 interrupt\n");

OST1_TIMER_OFF;

flag_ost1_int = 1;

}

int fnd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) {

       switch(cmd)

{

case 3 :

/* param : ioctl(fd, 3, timerPeriod); */

timerPeriod=arg;

timerClkVal=timerPeriod*SEC_CLK;

break;

default:

break;

}

return 0;

}

static int __init fnd_init(void) {

int result;

...

result = request_irq(IRQ_OST1, ost1_interrupt, SA_INTERRUPT, "fnd", NULL);

if (result != 0) {

printk("irq error");

return -1;

}

...

}

보드에서 insmod

[root@Xhyper255 /root]$insmod fnd.o

FND module is up...

FND_MAJOR = 253

[root@Xhyper255 /root]$

[root@Xhyper255 /root]$

[root@Xhyper255 /root]$mknod /dev/FND c 253 0

interrupt가 등록되었음을 확인할 수 있다. 19번으로 등록됨을 확인할 수 있다.

[root@Xhyper255 /root]$cat /proc/interrupts

  0:          0   eth0

  2:          0   GPIO 2-80

  3:          0   PXA USB core

  6:         42   AC97

 14:      15160   serial

 15:          9   MMC controller

 17:          0   DMA

 18:    2070369   timer

 19:          0   fnd

 25:          0   PXA PCMCIA CD

 27:          0   ads7843

 39:          0   PXA CF CD

Err:          0

fnd_app.c

/***************************************

 * Filename: fnd_app.c

 * Title: fnd Device Application

 * Desc: Implementation of system call

 ***************************************/

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <fcntl.h>

int main(void)

{

    int retn;

    int fd;

    int flag = 0;

    int menu;

short data, timerPeriod;

short fndValue;

    

    fd = open("/dev/FND", O_RDWR);

    printf("fd = %d\n", fd);

    

    if (fd<0) {

        perror("/dev/FND");

        exit(-1);

    }

    else

        printf("[APP]FND detected...\n");

    

    while(1)

    {

        printf("\n\n===== FND Test Program ====\n");

        printf(" 1. OSTimer_1 Interrupt Period Setting\n");

        printf(" 2. FND0 Read\n");

        printf(" 3. FND0 Write\n");

        printf(" 4. FND Clear\n");

        printf(" 0. Program Quit\n");

        do {

            printf(" Select Menu => ");

            scanf("%d", &menu);

        } while(menu<0 || menu>4);

        if(menu == 0) break;

        switch(menu) {

            case 1:

                printf("Input OSTimer_1 Int. Period Value(1~10) => ");

                scanf("%hd", &timerPeriod);

     ioctl(fd, 3, timerPeriod);

printf("\n[APP]OSTimer_1 Period Setting Done!!\n");

                break;

            case 2:

                printf("[APP]Wait OSTimer_1 Int...\n");

                read(fd, &data, sizeof(short));

printf("\n[APP]FND0 Value Read(%04x) Done!!\n", data);

                break;

            case 3:

                printf("Input FND0 Write Value(0~9) => ");

                scanf("%hd", &fndValue);

write(fd, &fndValue, sizeof(short));

printf("\n[APP]FND0 Value Write Done!!\n");

                break;

            case 4:

     ioctl(fd, 4, flag);

                break;

        }

    }

    close(fd);

    

    return 0;

}

 

실행결과 , 동작 잘됨

[root@Xhyper255 /root]$./fnd_app

fnd_open

fd = 3

[APP]FND detected...

===== FND Test Program ====

 1. OSTimer_1 Interrupt Period Setting

 2. FND0 Read

 3. FND0 Write

 4. FND Clear

 0. Program Quit

 Select Menu => 1

Input OSTimer_1 Int. Period Value(1~10) => 5

[FND_DD]ioctl(cmd:3)..

[APP]OSTimer_1 Period Setting Done!!

===== FND Test Program ====

 1. OSTimer_1 Interrupt Period Setting

 2. FND0 Read

 3. FND0 Write

 4. FND Clear

 0. Program Quit

 Select Menu => 2

[APP]Wait OSTimer_1 Int...

os timer1 interrupt

read data => 0000

[APP]FND0 Value Read(0000) Done!!

===== FND Test Program ====

 1. OSTimer_1 Interrupt Period Setting

 2. FND0 Read

 3. FND0 Write

 4. FND Clear

 0. Program Quit

 Select Menu =>