Hi Kavita
A generic question regarding interrupts.
If i register an interrupt using request_threaded_irq() or request_irq()
will that be listed in /proc/interrupts ?
On Tuesday, September 9, 2014 11:17:19 AM UTC+5:30, kavitha wrote:
>
>
> Does cat /proc/interrupts give show anything for 214.
>
> Check whether It is going to architecture specific impelemtation of
> gpio_to_irq
>
>
> On Tue, Sep 9, 2014 at 8:26 AM, neo star <prag....@gmail.com <javascript:>
> > wrote:
>
>> Hi
>>
>> I see that some function definitions are missing in your code. Can you
>> share those as well, so that i too can try and figure out the problem.
>> Especially the functions like gpio_to_irq() ...
>> Thanks.
>>
>>
>> On Tuesday, August 26, 2014 7:38:01 PM UTC+5:30, Siddarth Sharma wrote:
>>>
>>> I am toggling the input into a GPIO line on my BeagleBone from high to
>>> low every 500 ms using an Atmel uC. I have registered a handler for this in
>>> my Linux Kernel Module, but the handler is not being called for some reason.
>>>
>>> My module code is -
>>>
>>> #define GPIO 54
>>> #define GPIO_INT_NAME "gpio_int"
>>>
>>> #define GPIO_HIGH gpio_get_value(GPIO)
>>> #define GPIO_LOW (gpio_get_value(GPIO) == 0)
>>> short int irq_any_gpio = 0;
>>> int count =0;
>>>
>>> enum { falling, rising } type;
>>> static irqreturn_t r_irq_handler(int irq, void *dev_id)
>>> {
>>> count++;
>>> printk(KERN_DEBUG "interrupt received (irq: %d)\n", irq);
>>> if (irq == gpio_to_irq(GPIO))
>>> {
>>>
>>> type = GPIO_LOW ? falling : rising;
>>>
>>> if(type == falling)
>>> {
>>> printk("gpio pin is low\n");
>>> }
>>> else
>>> printk("gpio pin is high\n");
>>>
>>> }
>>>
>>> return IRQ_HANDLED;
>>> }
>>>
>>>
>>> void r_int_config(void) {
>>>
>>> if (gpio_request(GPIO, GPIO_INT_NAME ))
>>> {
>>> printk("GPIO request failure: %s\n", GPIO_INT_NAME );
>>> return;
>>> }
>>>
>>> if ( (irq_any_gpio = gpio_to_irq(GPIO)) < 0 ) {
>>> printk("GPIO to IRQ mapping failure %s\n",GPIO_INT_NAME );
>>> return;
>>> }
>>>
>>> printk(KERN_NOTICE "Mapped int %d\n", irq_any_gpio);
>>>
>>> if (request_irq(irq_any_gpio,(irq_handler_t ) r_irq_handler,
>>> IRQF_TRIGGER_HIGH, GPIO_INT_NAME, NULL))
>>> {
>>> printk("Irq Request failure\n");
>>> return;
>>> }
>>>
>>> return;
>>> }
>>>
>>> void r_int_release(void) {
>>>
>>> free_irq(gpio_to_irq(GPIO), NULL);
>>> gpio_free(GPIO);;
>>> return;
>>> }
>>>
>>> int init_module(void)
>>> {
>>> printk("<1>Hello World\n");
>>> r_int_config();
>>> return 0;
>>> }
>>>
>>> On calling insmod interrupt_test.ko, i get the following message
>>>
>>> [ 76.594543] Hello World
>>>
>>> [ 76.597137] Mapped int 214
>>>
>>> But now when I start toggling the input into this gpio pin, the
>>> interrupt handler doesn't get called and the message - "interrupt received"
>>> is not being displayed.
>>>
>>> How do I solve this ? What's causing the problem?
>>>
>> --
>> For more options, visit http://beagleboard.org/discuss
>> ---
>> You received this message because you are subscribed to the Google Groups
>> "BeagleBoard" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to beagleboard...@googlegroups.com <javascript:>.
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to beagleboard+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
