[Xenomai] Xenomai 3.0-rc3 Interruption on Arietta G25 (AT91SAM9G25 chip)

[Tianchi Huang <gz.eddie.htc@gmail.com>]

*Hello,*

*I'm now working on project using Arietta G25 board (AT91SAM9G25 chip) on
which i need to capture 1000 interruptions per second of an external ADC. *
*I have patched the kernel 3.14.17 with the patch ipipe-core-3.14.17-arm-5
which i found on GNA. The compilation passed and Xenomai seems to run all
right. The latency test gave me about 100us as worst value. *

*I make un modele of interruption test as below*
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <rtdm/driver.h>

#define GPIO_IN  27
static rtdm_irq_t irq_rtdm;
static int handler_interruption(rtdm_irq_t * irq){
printk(KERN_ALERT "IRQ received!\n");
return RTDM_IRQ_HANDLED;
}

static int __init exemple_init (void){
int err;
int num_interruption;
if ((err = gpio_request(GPIO_IN, "test_irq")) != 0) {
return err;
}
if ((err = gpio_direction_input(GPIO_IN)) != 0) {
gpio_free(GPIO_IN);
return err;
}
numero_interruption = gpio_to_irq(GPIO_IN);
irq_set_irq_type(numero_interruption, IRQF_TRIGGER_FALLING);
if ((err = rtdm_irq_request(& irq_rtdm, num_interruption,
handler_interruption, RTDM_IRQTYPE_EDGE, "test_irq", NULL)) != 0) {
gpio_free(GPIO_IN);
return err;
}
printk(KERN_ALERT "Driver registed\n");
rtdm_irq_enable(& irq_rtdm);
return 0;
}

static void __exit exemple_exit (void){
rtdm_irq_disable(& irq_rtdm);
rtdm_irq_free(&irq_rtdm);
gpio_free(GPIO_IN);
}
module_init(exemple_init);
module_exit(exemple_exit);
MODULE_LICENSE("GPL");


*It seems that it has been registed and run without no error, as you can
see just here:*
root@arietta:/home# cat /proc/xenomai/irq
  IRQ         CPU0
   17:           1         [timer/0]
   28:           0         test_irq
 1027:           0         [virtual]
root@arietta:/home# cat /proc/interrupts
           CPU0
 16:      31031       AIC   1  at91_tick, at91_rtc, ttyS0
 18:       1579       AIC  20  at_hdmac
 19:          0       AIC  21  at_hdmac
 23:      15338       AIC  12  f0008000.mmc
 25:          0       AIC  14  f0004000.spi
 26:      20732       AIC  23  atmel_usba_udc
 27:       8119       AIC  22  ehci_hcd:usb1, ohci_hcd:usb2
 28:          1      GPIO  27
Err:          0

*But, when i generate a signal on GPIO 27, i can see the counter of
/proc/interrupts increase but not the counter of /proc/xenomai/irq nor the
message i put in the interrupt handler, as you can see below:*

root@arietta:/home# cat /proc/xenomai/irq
  IRQ         CPU0
   17:           1         [timer/0]
   28:           0         test_irq
 1027:           0         [virtual]
root@arietta:/home# cat /proc/interrupts
           CPU0
 16:      31031       AIC   1  at91_tick, at91_rtc, ttyS0
 18:       1579       AIC  20  at_hdmac
 19:          0       AIC  21  at_hdmac
 23:      15338       AIC  12  f0008000.mmc
 25:          0       AIC  14  f0004000.spi
 26:      20732       AIC  23  atmel_usba_udc
 27:       8119       AIC  22  ehci_hcd:usb1, ohci_hcd:usb2
 28:       5459      GPIO  27
Err:          0

*Do you have any idea of that? I've tried Xenomai 2.6.4 too, but i had the
same problem. Hope you can help me with this.*

*Best regards,*



*Eddie HUANG*