Re: Interrupt handling triggered by GPIO-input on 405EP?

[Martin Egholm Nielsen <martin@egholm-nielsen.dk>]

[-- Attachment #1: Type: text/plain, Size: 650 bytes --]

Hi Andriy,

>> I've done some initial coding with the ibmgpio driver with my
>> PPC405EP (PPChamelon) board, and inspired by the
>> "gpio_test.c"-application, I've succeeded in turning on some
>> attached LEDs on some of the ports
> can you please share code for manipulating LEDs on PPChameleon? I'm
> using the same board and it would be fine to have such possibility.
I've attached my source-file for turning on LEDs (indirectly) connected
to GPIO-pins 11,13 and 15 on the PPChamelon board.
First of all I created the /dev/gpio device by the command:

mknod /dev/gpio c 10 185

and then you can open and close the pins as you like. :o)

// Martin

[-- Attachment #2: gpio_test.c --]
[-- Type: text/plain, Size: 836 bytes --]

#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>

#include <linux/types.h>
#include <linux/ioctl.h>

#include <linux/ibm_ocp_gpio.h>

#define GPIO_DEV "/dev/gpio"

int main(int argc, char *argv[])
{
	/* Open the device */
	int fd = open("/dev/gpio", O_RDWR);

	struct ibm_gpio_ioctl_data gpio_ioctl;
	int result;
	int command;

	if(fd==-1) {
		fprintf(stderr,"Unable to open /dev/gpio\n");
		exit(1);
	}

	gpio_ioctl.device=0;

	/* Set IRQ4 pin (GPIO0_21) high - turn on LED */
	gpio_ioctl.mask=0x00000400;
	gpio_ioctl.data=0x00000400;
	ioctl(fd,IBMGPIO_OUT,(void *)&gpio_ioctl);

	/* Sleep 1 second */
	sleep(1);

	/* Set IRQ3-5 pin (GPIO0_20-GPIO0_22) high - turn on LEDs */
	gpio_ioctl.mask=0x00000E00;
	gpio_ioctl.data=0x00000E00;
	ioctl(fd,IBMGPIO_OUT,(void *)&gpio_ioctl);

	close( fd );

	return 0;
}