【吃灰板子捡起来】按键输入实验

按键输入实验

一、驱动源码
二、应用源码
三、实验总结

一、驱动源码

硬件原理图

#include "nuc972_gpio.h"#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/device.h> #include <asm/mach/map.h>
#include <asm/uaccess.h>
#include <asm/io.h>#define KEY_DEV_NUMS 1
#define KEY_NAME "key"struct key_dev{dev_t devid;int major;int minor;  struct cdev cdev;struct class *class;struct device *device;
};struct key_dev key;/* */
#define SET_DIR 0X0100
#define GET_DIR 0X0200
#define SET_ODR 0X0300
#define GET_ODR 0X0400
#define GET_IDR 0X0500#define GPIOA 0x0000
#define GPIOB 0x0001
#define GPIOC 0x0002
#define GPIOD 0x0003
#define GPIOE 0x0004
#define GPIOF 0x0005
#define GPIOG 0x0006
#define GPIOH 0x0007
#define GPIOI 0x0008
#define GPIOJ 0x0009/* PF13-KEY1 PF14-KEY2 */
static int key_gpio_init(void)
{int temp;int ret = 0;set_gpio_direction(GPIOF,0x0000);return ret;
}static int key_open(struct inode *inode, struct file *filp)
{key_gpio_init();return 0;
}static ssize_t key_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
{int temp;int ret = 0;temp = get_gpio_idr(GPIOF);ret = copy_to_user(buf,&temp,sizeof(temp));return 0;
}static int key_release(struct inode *inode, struct file *filp)
{return 0;
}static struct file_operations key_fops = {.owner = THIS_MODULE,.open = key_open,.read = key_read,.release = key_release,
};static int __init key_init(void)
{int ret = 0; key.major = 0;if(key.major){key.devid = MKDEV(key.major, 0);ret = register_chrdev_region(key.devid,KEY_DEV_NUMS,KEY_NAME);}else{ret = alloc_chrdev_region(&key.devid,0,KEY_DEV_NUMS,KEY_NAME);   key.major = MAJOR(key.devid);key.minor = MINOR(key.devid);}if(ret < 0){printk("register chrdev failed!\r\n");goto fail_devid;}printk("key major = %d, minor = %d \r\n", key.major,key.minor);cdev_init(&key.cdev, &key_fops);key.cdev.owner = THIS_MODULE;ret = cdev_add(&key.cdev, key.devid, KEY_DEV_NUMS);if(ret < 0){printk("cdev_add failed!\r\n");goto fail_cdevadd;}key.class = class_create(THIS_MODULE, KEY_NAME);if(IS_ERR(key.class)){printk("class_create failed!\r\n");ret = PTR_ERR(key.class);goto fail_class;}key.device = device_create(key.class, NULL, key.devid, 0, KEY_NAME);if(IS_ERR(key.device)){printk("device_create failed!\r\n");ret = PTR_ERR(key.device);goto fail_device;}printk("key init success!\r\n");return 0; fail_device:class_destroy(key.class);
fail_class:cdev_del(&key.cdev);
fail_cdevadd:unregister_chrdev_region(key.devid,KEY_DEV_NUMS);
fail_devid:return ret;
}static void __exit key_exit(void)
{device_destroy(key.class,key.devid);class_destroy(key.class);cdev_del(&key.cdev);unregister_chrdev_region(key.devid, KEY_DEV_NUMS);printk("key_exit!\r\n");
}module_init(key_init);
module_exit(key_exit);MODULE_LICENSE("GPL");
MODULE_AUTHOR("mx");

MakeFile

#
#obj-m += nuc972_gpio.okey-objs  := key_input.o nuc972_gpio.o
obj-m := key.oPWD  := $(shell pwd)
KVER ?= $(shell uname -r)KDIR :=/home/maxuan/linuxbsp/linux-3.10.x
all:$(MAKE) -C $(KDIR) M=$(PWD)
clean:rm -rf .*.cmd *.o *.mod.c *.ko .tmp_versions

二、应用源码

#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#include "sys/types.h"
#include "sys/stat.h"
#include "fcntl.h"
#include "unistd.h"int main(int argc, char *argv[])
{int keyvalue = 0;int destvalue = 0;int fd;int ret = 0;char *filename;if(argc != 2){printf("Error Usage!\r\n");return -1;}filename = argv[1];fd = open(filename,O_RDWR);if(fd < 0){printf("file %s open failed!\r\n",filename);return -1;}destvalue = 1<<13;while(1){keyvalue = 0xffff;read(fd,&keyvalue,sizeof(keyvalue));if(keyvalue & destvalue){}else{printf("KEY1 is pressed!!\r\n");}}close(fd);return 0;
}

三、实验总结

1、能跑起来，没做消抖，先这样吧

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【吃灰板子捡起来】按键输入实验

按键输入实验

一、驱动源码

二、应用源码

三、实验总结

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