#include????
#include????
#include????
#include????
#include????
#include????
#include????
#include????
#include????
#include????
#include????
#include????
#include????
#include????
#include????
??
/*?相關(guān)引腳定義方便以后移植?*/??
#define?DQ?????????S3C2410_GPB（1）???
#define?CFG_IN?????S3C2410_GPIO_INPUT???
#define?CFG_OUT????S3C2410_GPIO_OUTPUT
#define?TIME_OUT_DEALY?100???
??
//?dht11主次設(shè)備號（動態(tài)分配）???
static?int?dht11_major?=?0;??
static?int?dht11_minor?=?0;??
static?int?dht11_nr_devs?=?1;?
unsigned?short?temperaturehumidity;
unsigned?char?checknum;
static?volatile?unsigned?char?values[6]={000000};?
??
//?定義設(shè)備類型???
static?struct?dht11_device??
{??
????struct?cdev?cdev;??
};??
??
struct?dht11_device?*dht11_devp;????/*設(shè)備結(jié)構(gòu)體指針?*/??
??
static?struct?class?*dht11_class;??
static?struct?class_device?*dht11_class_dev;??
??
/*?函數(shù)聲明?*/??
static?int?dht11_open（struct?inode?*inode?struct?file?*filp）;??
static?int?dht11_init（void）;??
static?ssize_t?dht11_read（struct?file?*filp?char?__user?*?buf?size_t?count?loff_t?*?f_pos）;??
void?dht11_setup_cdev（struct?dht11_device?*dev?int?index）;??


static?void?set_pin_high（void）
{
??????s3c2410_gpio_cfgpin（DQCFG_OUT）;
	??s3c2410_gpio_setpin（DQ?1）;
}

static?void?set_pin_low（void）
{
??????s3c2410_gpio_cfgpin（DQCFG_OUT）;
	??s3c2410_gpio_setpin（DQ?0）;
}?

static?int?set_pin_delay_get（unsigned?int?time）
{???
????
	s3c2410_gpio_cfgpin（DQCFG_IN）;
????udelay（time）;
????if（s3c2410_gpio_getpin（DQ））
		return?1;
	else
		return?0;
}

static?int?set_pin_get（void）
{???
????
	?
????if（s3c2410_gpio_getpin（DQ））
		return?1;
	else
		return?0;
}



??
static?int?dht11_open（struct?inode?*inode?struct?file?*filp）??
{??
????int?flag?=?0;??
??
????flag?=?dht11_init（）;??
????if?（flag?&?0x01）??
????{??
????????printk（KERN_WARNING?“open?dht11?failed\n“）;??
????????return?-1;??
????}??
????printk（KERN_NOTICE?“open?dht11?successful\n“）;??
????return?0;??
}??
??
static?int?dht11_init（void）??
{??
????int?retval?=?0;??
??
????set_pin_high（）;
??
????return?retval;??
}?



static?int?read_word_data（void）
{
?????int?i;
?????int?counter=0;
?????int?timerout_counter=0;
?????int?timerout_flag=0;
?????int?ret=0;
start:
	?set_pin_low（）;????//
	?mdelay（20）;???????//18ms
	?set_pin_high（）;???//
?????if（set_pin_delay_get（50））?//
?????	{
???????????printk（KERN_INFO“can?not?detect?the?low?ack!“）;
???????????counter++;
???????????if（counter>5）
??????????{
???????????ret=-1;
???????????goto?stop;
??????????}
???????????goto?start;
	????}
?????counter=0;
?????timerout_counter=0;
?????while（（!set_pin_get（））&&（timerout_counter++?????if（timerout_counter>=TIME_OUT_DEALY）
?????{
?????????????timerout_flag=1;
?????????????goto?out_err;
?????}?
?????timerout_counter=0;
?????while（（set_pin_get（））&&（timerout_count

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

????I.A....??????8056??2014-07-27?15:03??linxu_dht11\dht11\app_mini2440_dht11

????I.A....???????829??2014-07-27?15:03??linxu_dht11\dht11\app_mini2440_dht11.c

????I.A....???????829??2014-07-27?14:54??linxu_dht11\dht11\app_mini2440_dht11.c~

????I.A....???????157??2014-07-27?10:05??linxu_dht11\dht11\Makefile

????I.A....???????112??2014-07-27?10:04??linxu_dht11\dht11\Makefile~

????I.A....??????8959??2014-07-27?14:53??linxu_dht11\mini2440_dht11.c

????I..D...?????????0??2014-07-27?15:09??linxu_dht11\dht11

?????目錄??????????0??2014-07-27?15:17??linxu_dht11

-----------?---------??----------?-----??----

????????????????18942????????????????????8