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December 1, 2014 12:34
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irq-gpio-rtdm.c
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/*************** | |
Use the code to drive interrupt function. | |
When input "high" to GPIO-20, the GPIO-7 will output a signal between high and low. | |
****************/ | |
#include <linux/fs.h> | |
#include <linux/gpio.h> | |
#include <linux/interrupt.h> | |
#include <linux/module.h> | |
#include <rtdm/rtdm_driver.h> | |
//The GPIO for beaglebone black | |
#define GPIO_IN 20 | |
#define GPIO_OUT 7 | |
static rtdm_irq_t irq_rtdm; | |
static int handler_interruption(rtdm_irq_t * irq) | |
{ | |
static int value = 0; | |
gpio_set_value(GPIO_OUT, value); | |
value = 1 - value; | |
return RTDM_IRQ_HANDLED; | |
} | |
static int __init exemple_init (void) | |
{ | |
int err; | |
int numero_interruption = gpio_to_irq(GPIO_IN); | |
if ((err = gpio_request(GPIO_IN, THIS_MODULE->name)) != 0) { | |
return err; | |
} | |
if ((err = gpio_direction_input(GPIO_IN)) != 0) { | |
gpio_free(GPIO_IN); | |
return err; | |
} | |
if ((err = gpio_request(GPIO_OUT, THIS_MODULE->name)) != 0) { | |
gpio_free(GPIO_IN); | |
return err; | |
} | |
if ((err = gpio_direction_output(GPIO_OUT, 1)) != 0) { | |
gpio_free(GPIO_OUT); | |
gpio_free(GPIO_IN); | |
return err; | |
} | |
irq_set_irq_type(numero_interruption, IRQF_TRIGGER_RISING); | |
if ((err = rtdm_irq_request(& irq_rtdm, | |
numero_interruption, handler_interruption, | |
RTDM_IRQTYPE_EDGE, | |
THIS_MODULE->name, NULL)) != 0) { | |
gpio_free(GPIO_OUT); | |
gpio_free(GPIO_IN); | |
return err; | |
} | |
return 0; | |
} | |
static void __exit exemple_exit (void) | |
{ | |
rtdm_irq_free(& irq_rtdm); | |
gpio_free(GPIO_OUT); | |
gpio_free(GPIO_IN); | |
} | |
module_init(exemple_init); | |
module_exit(exemple_exit); | |
MODULE_LICENSE("GPL"); |
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