test-buttons.c

linux下按键的驱动

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <errno.h>
main(void)
{
	int buttons_fd;
	int key_value;
	int ret;
	buttons_fd=open("/dev/buttons/1",0);
	while(1)
	{
		ret=read(buttons_fd,&key_value,sizeof(key_value));
		if(ret<0)
		{
			continue;
		}
		printf("buttons_value: %d\n",key_value);
	}
	close(buttons_fd);
	return;
}