interrupt in button_pio

\com.microtronix.nios2linux.kernel_1.4.0\linux-2.6.x\drivers\char\altera_pio_button.c

you can find a lot about pio buttons in the forum.

Hi,

I have looked at the example as suggested, but just couldn't understand it.

It looks like it's a driver.

I am just trying to write an application is based on pio interrupt. Anyone has some simple example application that allow me to that ?

Thanks.

--- Quote Start ---

originally posted by albertyong88@Nov 15 2006, 05:14 PM

hi,

i have looked at the example as suggested, but just couldn't understand it.

it looks like it's a driver.

i am just trying to write an application is based on pio interrupt. anyone has some simple example application that allow me to that ?

thanks.

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=19440)

--- quote end ---

--- Quote End ---

You need to read the book "linux device driver 3rd ed" .

seperate device driver from your application improve your program.

Hi,

What I have done now is included the altera_pio_button.c into the source tree locally, and change Makefile and Kconfig accordingly, and then compile by doing

make; make linux image;

All seems to be fine, but when I look at /proc/interrupts, there is no list of pio_buttons nor is there /dev/btn

Any ideas what went wrong ?

--- Quote Start ---

originally posted by albertyong88@Nov 15 2006, 11:44 PM

hi,

what i have done now is included the altera_pio_button.c into the source tree locally, and change makefile and kconfig accordingly, and then compile by doing

make; make linux image;

all seems to be fine, but when i look at /proc/interrupts, there is no list of pio_buttons nor is there /dev/btn

any ideas what went wrong ?

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=19452)

--- quote end ---

--- Quote End ---

you need to open and read the char dev /dev/btn.

eg, cat /dev/btn

The nios2 patches (ver17) to uClinux-dist are updated to include button and lcd drivers now.

Hi Hippo,

I got the new kernel patches, and included in my new built.

However, it booted up, there was nothing indicating the driver is loaded.

I am attaching the boot screen

<div class='quotetop'>QUOTE </div>

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Uncompressing Linux... Ok, booting the kernel.

Linux version 2.6.17-uc1 (uclinux@colinux) (gcc version 3.4.6)# 29 PREEMPT Tue N

ov 21 10:20:08 EST 2006

uClinux/Nios II

Altera Nios II support © 2004 Microtronix Datacom Ltd.

Built 1 zonelists

Kernel command line:

PID hash table entries: 256 (order: 8, 1024 bytes)

Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)

Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)

Memory available: 30312k/32768k RAM, 0k/0k ROM (1475k kernel code, 663k data)

Mount-cache hash table entries: 512

NET: Registered protocol family 16

NET: Registered protocol family 2

IP route cache hash table entries: 1024 (order: 0, 4096 bytes)

TCP established hash table entries: 1024 (order: 0, 4096 bytes)

TCP bind hash table entries: 1024 (order: 0, 4096 bytes)

TCP: Hash tables configured (established 1024 bind 1024)

TCP reno registered

io scheduler noop registered

io scheduler deadline registered (default)

You have init Device 250

Serial: JTAG UART driver $Revision: 1.1 $

ttyJ0 at MMIO 0x822208b0 (irq = 1) is a jtag_uart

smc91x.c: v1.1, sep 22 2004 by Nicolas Pitre <nico@cam.org>

eth0: SMC91C11xFD (rev 1) at 82210300 IRQ 6 [nowait]

eth0: Ethernet addr: 00:07:ed:0f:06:92

i2c /dev entries driver

i2c-oc: i2c Opencores adapter driver

Opencores i2c algorithm module

TCP bic registered

NET: Registered protocol family 1

NET: Registered protocol family 17

Freeing unused kernel memory: 532k freed (0x4182000 - 0x4206000)

Shell invoked to run file: /etc/rc

Command: hostname uClinux

Command: mount -t proc proc /proc

Command: mount -t sysfs sysfs /sys

Command: mount -t usbfs none /proc/bus/usb

mount: Mounting none on /proc/bus/usb failed: No such file or directory

Command: mkdir /var/tmp

Command: mkdir /var/log

Command: mkdir /var/run

Command: mkdir /var/lock

Command: mkdir /var/empty

Command: ifconfig lo 127.0.0.1

Command: route add -net 127.0.0.0 netmask 255.0.0.0 lo

Command: ifconfig eth0 192.168.50.63eth0: link down

Command: cat /etc/motd

Welcome to

____ _ _

/ __| ||_|

_ _| | | | _ ____ _ _ _ _

| | | | | | || | _ \| | | |\ \/ /

| |_| | |__| || | | | | |_| |/

| ___\____|_||_|_| |_|\____|\_/\_/

| |

|_|

For further information check:

http://www.uclinux.org/ (http://www.uclinux.org/)

Command: inetd &

[18]

Command: mkdir /nios2bin

Command: mount -t nfs -n -o nolock,rsize=1024,wsize=1024 192.168.50.62:/home/ucl

inux/nios2bin /nios2bin

eth0: link up, 100Mbps, full-duplex, lpa 0x45E1

Command: boa &

[21]

Command:

Execution Finished, Exiting

Sash command shell (version 1.1.1)

/>[/b]

--- Quote End ---

Also, I added

nod /dev/btn 666 0 0 c 62 0

in romfs_list

After booting, check /dev dir, btn seems to be there.

When I did cat /proc/devices, I get

<div class='quotetop'>QUOTE </div>

--- Quote Start ---

/> cat /proc/devices

Character devices:

1 mem

2 pty

3 ttyp

5 /dev/tty

5 /dev/console

10 misc

89 i2c

232 ttyJ

240 iodata

241 iodir

250 LCD_PIO[/b]

--- Quote End ---

And when I did cat /proc/interrupts, I get

<div class='quotetop'>QUOTE </div>

--- Quote Start ---

: 0 spurious

0: 15431 L timer

1: 24 jtag_uart

2: 30 pio_button

6: 602 L eth0

7: 1 Opencores I2C[/b]

--- Quote End ---

I also read the aritcle in icwin by Wyouken.

http://www.icwin.net/source/pdf/nios2_linu...nux_nios2_3.pdf (http://www.icwin.net/source/pdf/nios2_linux/run_uclinux_nios2_3.pdf)

So, it seems that the driver is NOT loaded. Can you help ?