Linux核心驅動基礎框架

#include

//file_operations 宣告
#include
//module_init module_exit 宣告
#include
// __init __exit 巨集定義宣告
#include
//class device 宣告
#include
//copy_from_user 標頭檔案
#include
//裝置號 dev_t 宣告 
#include
//ioremap iounmap 標頭檔案
static
struct class *pin_class;
static
struct device *pin_class_dev;
static dev_t devno;
//裝置號
static
int major =
231;
//主裝置號
static
int minjor =0;
//次裝置號
static
char
*module_name =
"pin"
;//模組名
volatile
unsigned
int* gpfsel0 =
null
;volatile
unsigned
int* gpset0 =
null
;volatile
unsigned
int* gpclr0 =
null
;static
int pin_open (
struct inode *inode,
struct file *file)
static
int pin_read (
struct file *file1,
char __user *buf, size_t count, loff_t *ppos)
static
int pin_write (
struct file *file1,
char __user *buf, size_t count, loff_t *ppos)
else
if(usercmd ==0)
else
return0;
}static
struct file_operations pin_fops =
;int __init pin_drv_init
(void
)void __exit pin_dev_exit
(void
)module_init
(pin_drv_init)
;//入口
module_exit
(pin_drv_exit)
;module_license
("gpl v2"
);

cd /home/whao/linux-rpi-

4.14
.y/drivers/
char
/

cp ~

/pin4driver.c .

vi makefile

obj-m                           +

= pindriver.o

cd /home/whao/linux-rpi-

4.14
.y/

arch=arm cross_compile=arm-linux-gnueabihf- kernel=kernel7 make modules

scp drivers/

char
/pin4driver.ko [email protected]
.1.7
:/home/pi

sudo insmod pindriver.ko

chmod 666

/dev/pin

#include

#include
#include
#include
void
main()
else
}

arm-linux-gnueabihf-gcc pintest.c -o pintest

scp pintest [email protected]

.1.7
:/home/pi

dmesg

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