|
GPIO programming and Interrupts
Hello ,
I have written a device driver to make use of the gpio to trigger interrupts. I have attached a part of the whole code. You can try using it.
I have attached the makefile as well. Edit the path to kernel source in the makefile.
shashi.
Date: Tue, 30 Jun 2009 01:39:42 -0700 (PDT)
From: cruizbugs <cruiz_bugs@...>
Subject: [Gumstix-users] GPIO programming and Interrupts
To: gumstix-users@...
Message-ID: <24268234.post@...>
Content-Type: text/plain; charset=us-ascii
Hi, I have a few questions.
I have a task to make my gumstix to control a switch.
So, I am using a GPIO 28 to control the external device.
I understand that I can use
# echo "GPIO out set" > /proc/gpio/GPIO28
# echo "GPIO out clear" > /proc/gpio/GPIO28
to control the pin output manually, but what I have to do is to make an
automatic on-off.
meaning,
I will have to read from a .txt file that contains all the day and time to
on/off.
this text file will turn on-off the switch every few minutes, i.e.
Monday 01:00 am ON
Monday 01:02 am OFF
Monday 01:05 am ON
Monday 01:59 am OFF
etc..
So, regarding this task and since i'm still new to linux,
1. i was thinking what programming language I should use? C or C++ ? which
one easier?
2. i found this http://docwiki.gumstix.org/index.php/Sample_code/C/gpregs
how to run this file ? does this work for verdex pro XL6P ? i'm using GPIO
on consoleLCD16
3. Is there any idea on how to do this effectively?
I was being told to try to use interrupt, for example, for every minute i
will receive an interrupt, then i will read the list of the timing and check
out if I have to on or off the switch.
but the problem is, how to set this kind of interrupt? i heard about kernel
programming, but i'm still quite lost here.
or is there any other better way to do this task?
I saw http://docwiki.gumstix.org/GPIO_event , but i dont think this is
related to what I have to do, right ??
sorry I ask alot.
Thanks you in advance :-)
#include<linux/init.h>
#include<linux/module.h>
#include<linux/kernel.h>
#include<linux/slab.h>
#include<linux/errno.h>
#include<linux/types.h>
#include<linux/fs.h>
#include<linux/proc_fs.h>
#include<linux/fcntl.h>
#include<linux/fb.h>
#include<linux/interrupt.h>
#include<linux/ioctl.h>
#include<linux/types.h>
#include<linux/fcntl.h>
#include<linux/errno.h>
#include<linux/gpio.h>
#include<linux/mman.h>
#include<linux/mm.h>
#include<linux/vmalloc.h>
#include<linux/slab.h>
#define OVERO_SPI_PENDOWN 144
#define OVERO_GPIO1_PENDOWN 145
#define gpio145_pad 0x48002174
#define gpiobank5 0x49056034
MODULE_LICENSE("Dual BSD/GPL");
void gpioint_exit(void);
int gpioint_init(void);
static int result,temp=0;
static irqreturn_t gpio_ISR(int irq,void *dev_id);
static irqreturn_t gpio_ISR1(int irq,void *dev_id);
static void volatile *gpio5_base1, *gpio5_base2;
module_init(gpioint_init);
module_exit(gpioint_exit);
int fgen_open(struct inode *inode, struct file *filp);
int fgen_release(struct inode *inode, struct file *filp);
struct file_operations fgen_fops = {
open: fgen_open,
release: fgen_release
};
int gpioint_init()
{
//int i,j,k;
result = register_chrdev(0, "gpio_test",&fgen_fops);
printk("gpio:major number %d \n",result);
if ((gpio_request(OVERO_SPI_PENDOWN,"gpio_test")) == 0 && (gpio_direction_input(OVERO_SPI_PENDOWN))==0)
{
gpio_export(OVERO_SPI_PENDOWN,0);
} else
{
printk(KERN_ERR "could not obtain gpio for gpio144 IRQ\n");
return(0);
}
if ((gpio_request(OVERO_GPIO1_PENDOWN,"gpio_test")) == 0 && (gpio_direction_input(OVERO_GPIO1_PENDOWN))==0)
{
gpio_export(OVERO_GPIO1_PENDOWN,0);
} else
{
printk(KERN_ERR "could not obtain gpio for gpio145 IRQ\n");
return(0);
}
if(request_irq(OMAP_GPIO_IRQ(OVERO_SPI_PENDOWN),gpio_ISR, IRQF_TRIGGER_LOW, "gpio_test",NULL))
{
printk(" can't load interrupt\n");
}
printk("\n IRQ value=%d \n",OMAP_GPIO_IRQ(OVERO_SPI_PENDOWN));
if(request_irq(OMAP_GPIO_IRQ(OVERO_GPIO1_PENDOWN),gpio_ISR1, IRQF_TRIGGER_HIGH, "gpio_test",NULL))
{
printk(" can't load interrupt\n");
}
printk("\n IRQ value=%d \n",OMAP_GPIO_IRQ(OVERO_GPIO1_PENDOWN));
}
void gpioint_exit(void)
{
/* Freeing the major number */
unregister_chrdev(result, "gpio_test");
/* Freeing interrupt */
free_irq(OMAP_GPIO_IRQ(OVERO_SPI_PENDOWN),NULL);
free_irq(OMAP_GPIO_IRQ(OVERO_GPIO1_PENDOWN),NULL);
printk("<1>Removing fgen module\n");
}
static irqreturn_t gpio_ISR(int irq,void *dev_id)
{
printk("interrupt acknowledged 144\n");
return IRQ_HANDLED;
}
static irqreturn_t gpio_ISR1(int irq,void *dev_id)
{
printk("interrupt acknowledged 145\n");
return IRQ_HANDLED;
}
int fgen_open(struct inode *inode, struct file *filp)
{
/* Success */
return 0;
}
int fgen_release(struct inode *inode, struct file *filp)
{
/* Success */
return 0;
}
------------------------------------------------------------------------------
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Fwd: GPIO programming and Interrupts
cant see the attachment .... sorry for that.... here's the code and make file
-------gpio_interrupt.c
#define OVERO_SPI_PENDOWN 144
#define OVERO_GPIO1_PENDOWN 145
#define gpio145_pad 0x48002174
#define gpiobank5 0x49056034
MODULE_LICENSE("Dual BSD/GPL");
void gpioint_exit(void);
int gpioint_init(void);
static int result,temp=0;
static irqreturn_t gpio_ISR(int irq,void *dev_id);
static irqreturn_t gpio_ISR1(int irq,void *dev_id);
static void volatile *gpio5_base1, *gpio5_base2;
module_init(gpioint_init);
module_exit(gpioint_exit);
int fgen_open(struct inode *inode, struct file *filp);
int fgen_release(struct inode *inode, struct file *filp);
struct file_operations fgen_fops = {
open: fgen_open,
release: fgen_release
};
int gpioint_init()
{
//int i,j,k;
result = register_chrdev(0, "gpio_test",&fgen_fops);
printk("gpio:major number %d \n",result);
if ((gpio_request(OVERO_SPI_PENDOWN,"gpio_test")) == 0 && (gpio_direction_input(OVERO_SPI_PENDOWN))==0)
{
gpio_export(OVERO_SPI_PENDOWN,0);
} else
{
printk(KERN_ERR "could not obtain gpio for gpio144 IRQ\n");
return(0);
}
if ((gpio_request(OVERO_GPIO1_PENDOWN,"gpio_test")) == 0 && (gpio_direction_input(OVERO_GPIO1_PENDOWN))==0)
{
gpio_export(OVERO_GPIO1_PENDOWN,0);
} else
{
printk(KERN_ERR "could not obtain gpio for gpio145 IRQ\n");
return(0);
}
if(request_irq(OMAP_GPIO_IRQ(OVERO_SPI_PENDOWN),gpio_ISR, IRQF_TRIGGER_LOW, "gpio_test",NULL))
{
printk(" can't load interrupt\n");
}
printk("\n IRQ value=%d \n",OMAP_GPIO_IRQ(OVERO_SPI_PENDOWN));
if(request_irq(OMAP_GPIO_IRQ(OVERO_GPIO1_PENDOWN),gpio_ISR1, IRQF_TRIGGER_HIGH, "gpio_test",NULL))
{
printk(" can't load interrupt\n");
}
printk("\n IRQ value=%d \n",OMAP_GPIO_IRQ(OVERO_GPIO1_PENDOWN));
}
void gpioint_exit(void)
{
/* Freeing the major number */
unregister_chrdev(result, "gpio_test");
/* Freeing interrupt */
free_irq(OMAP_GPIO_IRQ(OVERO_SPI_PENDOWN),NULL);
free_irq(OMAP_GPIO_IRQ(OVERO_GPIO1_PENDOWN),NULL);
printk("<1>Removing fgen module\n");
}
static irqreturn_t gpio_ISR(int irq,void *dev_id)
{
printk("interrupt acknowledged 144\n");
return IRQ_HANDLED;
}
static irqreturn_t gpio_ISR1(int irq,void *dev_id)
{
printk("interrupt acknowledged 145\n");
return IRQ_HANDLED;
}
int fgen_open(struct inode *inode, struct file *filp)
{
/* Success */
return 0;
}
int fgen_release(struct inode *inode, struct file *filp)
{
/* Success */
return 0;
}------------------Makefile
obj-m := gpio_interrupt.o
all: gpio_interrupt.c
make ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi- -C /home/cedt/Desktop/sakoman_latest_kernels/linux-omap-2.6 M=$(PWD) modules
clean:
rm *.ko *.o Module.symvers hello.mod.c
---------- Forwarded message ---------- From: shashidhara <shashi.mailme@...>
Date: Fri, Jul 3, 2009 at 7:58 PM Subject: [Gumstix-users] GPIO programming and Interrupts To: gumstix-users@...
Hello ,
I have written a device driver to make use of the gpio to trigger interrupts. I have attached a part of the whole code. You can try using it.
I have attached the makefile as well. Edit the path to kernel source in the makefile.
shashi.
Date: Tue, 30 Jun 2009 01:39:42 -0700 (PDT)
From: cruizbugs <cruiz_bugs@...>
Subject: [Gumstix-users] GPIO programming and Interrupts
To: gumstix-users@...
Message-ID: <24268234.post@...>
Content-Type: text/plain; charset=us-ascii
Hi, I have a few questions.
I have a task to make my gumstix to control a switch.
So, I am using a GPIO 28 to control the external device.
I understand that I can use
# echo "GPIO out set" > /proc/gpio/GPIO28
# echo "GPIO out clear" > /proc/gpio/GPIO28
to control the pin output manually, but what I have to do is to make an
automatic on-off.
meaning,
I will have to read from a .txt file that contains all the day and time to
on/off.
this text file will turn on-off the switch every few minutes, i.e.
Monday 01:00 am ON
Monday 01:02 am OFF
Monday 01:05 am ON
Monday 01:59 am OFF
etc..
So, regarding this task and since i'm still new to linux,
1. i was thinking what programming language I should use? C or C++ ? which
one easier?
2. i found this http://docwiki.gumstix.org/index.php/Sample_code/C/gpregs
how to run this file ? does this work for verdex pro XL6P ? i'm using GPIO
on consoleLCD16
3. Is there any idea on how to do this effectively?
I was being told to try to use interrupt, for example, for every minute i
will receive an interrupt, then i will read the list of the timing and check
out if I have to on or off the switch.
but the problem is, how to set this kind of interrupt? i heard about kernel
programming, but i'm still quite lost here.
or is there any other better way to do this task?
I saw http://docwiki.gumstix.org/GPIO_event , but i dont think this is
related to what I have to do, right ??
sorry I ask alot.
Thanks you in advance :-)
-- From His Divine Power Comes Forth All This Magical Show Of Name And Form, Of You And Me, Which Casts The Spell Of Pain And Pleasure. Only When We Pierce Through This Magic Veil Do We See The One Who Appears As Many.
- SHVETASHVATARA UPANISHAD
------------------------------------------------------------------------------
_______________________________________________
gumstix-users mailing list
gumstix-users@...
https://lists.sourceforge.net/lists/listinfo/gumstix-users
|
|
Re: Fwd: GPIO programming and Interrupts
Some parts of this message have been removed.
Learn more about Nabble's security policy.
Hi, thanks alot for your help on this. I will try this out. :)
Regards,
Chri
From: shashidhara <shashi.mailme@...>
To: gumstix-users@...
Sent: Friday, July 3, 2009 22:56:23
Subject: [Gumstix-users] Fwd: GPIO programming and Interrupts
cant see the attachment .... sorry for that.... here's the code and make file
-------gpio_interrupt.c
#define OVERO_SPI_PENDOWN 144
#define OVERO_GPIO1_PENDOWN 145
#define gpio145_pad 0x48002174
#define gpiobank5 0x49056034
MODULE_LICENSE("Dual BSD/GPL");
void gpioint_exit(void);
int gpioint_init(void);
static int result,temp=0;
static irqreturn_t gpio_ISR(int irq,void *dev_id);
static irqreturn_t gpio_ISR1(int irq,void *dev_id);
static void volatile *gpio5_base1, *gpio5_base2;
module_init(gpioint_init);
module_exit(gpioint_exit);
int fgen_open(struct inode *inode, struct file *filp);
int fgen_release(struct inode *inode, struct file *filp);
struct file_operations fgen_fops = {
open: fgen_open,
release: fgen_release
};
int gpioint_init()
{
//int i,j,k;
result = register_chrdev(0, "gpio_test",&fgen_fops);
printk("gpio:major number %d \n",result);
if ((gpio_request(OVERO_SPI_PENDOWN,"gpio_test")) == 0 && (gpio_direction_input(OVERO_SPI_PENDOWN))==0)
{
gpio_export(OVERO_SPI_PENDOWN,0);
} else
{
printk(KERN_ERR "could not obtain gpio for gpio144 IRQ\n");
return(0);
}
if ((gpio_request(OVERO_GPIO1_PENDOWN,"gpio_test")) == 0 && (gpio_direction_input(OVERO_GPIO1_PENDOWN))==0)
{
gpio_export(OVERO_GPIO1_PENDOWN,0);
} else
{
printk(KERN_ERR "could not obtain gpio for gpio145 IRQ\n");
return(0);
}
if(request_irq(OMAP_GPIO_IRQ(OVERO_SPI_PENDOWN),gpio_ISR, IRQF_TRIGGER_LOW, "gpio_test",NULL))
{
printk(" can't load interrupt\n");
}
printk("\n IRQ value=%d \n",OMAP_GPIO_IRQ(OVERO_SPI_PENDOWN));
if(request_irq(OMAP_GPIO_IRQ(OVERO_GPIO1_PENDOWN),gpio_ISR1, IRQF_TRIGGER_HIGH, "gpio_test",NULL))
{
printk(" can't load interrupt\n");
}
printk("\n IRQ value=%d \n",OMAP_GPIO_IRQ(OVERO_GPIO1_PENDOWN));
}
void gpioint_exit(void)
{
/* Freeing the major number */
unregister_chrdev(result, "gpio_test");
/* Freeing interrupt */
free_irq(OMAP_GPIO_IRQ(OVERO_SPI_PENDOWN),NULL);
free_irq(OMAP_GPIO_IRQ(OVERO_GPIO1_PENDOWN),NULL);
printk("<1>Removing fgen module\n");
}
static irqreturn_t gpio_ISR(int irq,void *dev_id)
{
printk("interrupt acknowledged 144\n");
return IRQ_HANDLED;
}
static irqreturn_t gpio_ISR1(int irq,void *dev_id)
{
printk("interrupt acknowledged 145\n");
return IRQ_HANDLED;
}
int fgen_open(struct inode *inode, struct file *filp)
{
/* Success */
return 0;
}
int fgen_release(struct inode *inode, struct file *filp)
{
/* Success */
return 0;
}------------------Makefile
obj-m := gpio_interrupt.o
all: gpio_interrupt.c
make ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi- -C /home/cedt/Desktop/sakoman_latest_kernels/linux-omap-2.6 M=$(PWD) modules
clean:
rm *.ko *.o Module.symvers hello.mod.c
---------- Forwarded message ---------- From: shashidhara <shashi.mailme@...>
Date: Fri, Jul 3, 2009 at 7:58 PM Subject: [Gumstix-users] GPIO programming and Interrupts To: gumstix-users@...
Hello ,
I have written a device driver to make use of the gpio to trigger interrupts. I have attached a part of the whole code. You can try using it.
I have attached the makefile as well. Edit the path to kernel source in the makefile.
shashi.
Date: Tue, 30 Jun 2009 01:39:42 -0700 (PDT)
From: cruizbugs <cruiz_bugs@...>
Subject: [Gumstix-users] GPIO programming and Interrupts
To: gumstix-users@...
Message-ID: <24268234.post@...>
Content-Type: text/plain; charset=us-ascii
Hi, I have a few questions.
I have a task to make my gumstix to control a switch.
So, I am using a GPIO 28 to control the external device.
I understand that I can use
# echo "GPIO out set" > /proc/gpio/GPIO28
# echo "GPIO out clear" > /proc/gpio/GPIO28
to control the pin output manually, but what I have to do is to make an
automatic on-off.
meaning,
I will have to read from a .txt file that contains all the day and time to
on/off.
this text file will turn on-off the switch every few minutes, i.e.
Monday 01:00 am ON
Monday 01:02 am OFF
Monday 01:05 am ON
Monday 01:59 am OFF
etc..
So, regarding this task and since i'm still new to linux,
1. i was thinking what programming language I should use? C or C++ ? which
one easier?
2. i found this http://docwiki.gumstix.org/index.php/Sample_code/C/gpregs
how to run this file ? does this work for verdex pro XL6P ? i'm using GPIO
on consoleLCD16
3. Is there any idea on how to do this effectively?
I was being told to try to use interrupt, for example, for every minute i
will receive an interrupt, then i will read the list of the timing and check
out if I have to on or off the switch.
but the problem is, how to set this kind of interrupt? i heard about kernel
programming, but i'm still quite lost here.
or is there any other better way to do this task?
I saw http://docwiki.gumstix.org/GPIO_event , but i dont think this is
related to what I have to do, right ??
sorry I ask alot.
Thanks you in advance :-)
-- From His Divine Power Comes Forth All This Magical Show Of Name And Form, Of You And Me, Which Casts The Spell Of Pain And Pleasure. Only When We Pierce Through This Magic Veil Do We See The One Who Appears As Many.
- SHVETASHVATARA UPANISHAD
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Now you can @ymail.com and @rocketmail.com. ------------------------------------------------------------------------------
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Makefile (320 bytes) 