硬件：at91rm9200
软件：linux
目标：9200的6个gpio口接6个按键，编写了查询方式的驱动，驱动编译通过，加载也成功，但是用测试程序测试的时候没反应。我把源码附上，请各位高手给个建议。
typedef char S8;
typedef unsigned char U8;
typedef int S16;
typedef unsigned int U16;
typedef long S32;
typedef unsigned long U32;
U8 set_cnt;
#define TIME_KEY 200
#define KK0 ((unsigned int)0x1 << 12) //pb12 DOWN
#define KK1 ((unsigned int)0x1 << 13) //pb13 Confirm
#define KK2 ((unsigned int)0x1 << 14) //pb14 Right
#define KK3 ((unsigned int)0x1 << 15) //pb15,left
#define KK4 ((unsigned int)0x1 << 16) //pb16,cancle
#define KK5 ((unsigned int)0x1 << 17) //pb17 up
U8 KEY_FLAG = 0x00;
#define key_PageDown_** (0x1<<0)
#define confirm_press_** (0x1<<1)
#define key_NumAdd_** (0x1<< 2)
#define key_NumSubb_** (0x1<<3)
#define cancel_press_** (0x1<<4)
#define key_PageUp_** (0x1<<5)
void kdb_gpio_init(void); //IO端口初始化
static int major = 0;
static char dev_name[] = "kdb_dev";
U8 ReadKey( void);
void Delay(U16 t)
{
while(t--);
}
//void Opreat_IO();
/*************************************************************************
name : void key_close(struct inode * inode, struct file * file)
**************************************************************************/
static int kbd_close (struct inode * inode, struct file * file)
{
printk("key is closed
");
MOD_DEC_USE_COUNT;
return 0;
}
/**************************************************************************
name : static int key_open(struct inode * inode, struct file * file)
****************************************************************************/
static int kbd_open(struct inode * inode, struct file * file)
{
printk("key is open
");
MOD_INC_USE_COUNT;
return 0;
}
/***************************************************************************8
*************************************************************************/
static U8 kbd_read(struct file *file,char *buffer,size_t count,loff_t *ppos)
{
U8 temp;
temp = ReadKey();
copy_to_user(buffer,&temp,sizeof(U8));
return (sizeof(U8));
}
/**********************************************************************************
name: atic int kdb_Ioctl(struct inode *inode,
struct file * file,
unsigned int cmd,
unsigned long arg)
function: kdb io ioput control
***********************************************************************************/
static int kbd_Ioctl(struct inode *inode,struct file * file,unsigned long cmd,unsigned long arg)
{
return 0;
}
/********************************************************************
name : struct file_operations kdb_dev_fops
function: 文件结构
********************************************************************/
static struct file_operations kdb_dev_fops =
{
owner: THIS_MODULE,
ioctl: kbd_Ioctl,
open: kbd_open,
release: kbd_close,
read: kbd_read,
};
/**********************************************************
name：int __int_module(void)
function：初始化模块
**********************************************************/
static devfs_handle_t devfs_handle;
static int __init kdb_init_module(void)
{
int ret;
ret = devfs_register_chrdev(major,dev_name,&kdb_dev_fops);
if(ret < 0)
{
printk("embedder linux:init_module failed with %d
",ret);
return ret;
}
else
printk("KERN_INFO:Embedded linux chardevice register successful!
");
if(major == 0)
major = ret;
devfs_handle = devfs_register(NULL,dev_name,DEVFS_FL_DEFAULT,major,0,S_IFCHR|S_IWUSR,&kdb_dev_fops,NULL);
AT91_SYS->PIOB_PER |= KK0 | KK1 | KK2 |KK3 |KK4 | KK5;
AT91_SYS->PIOB_ODR |= KK0 | KK1 | KK2 |KK3 |KK4 | KK5;
AT91_SYS->PMC_PCER |= (0x1 << AT91C_ID_PIOB); //enable the mck clock;
return 0;
}
/*******************************************************
name: __exit s_cleanup_module(void)
function：注销gpio_lcd模块
********************************************************/
static void __exit kdb_cleanup_module(void)
{
int retv;
retv = devfs_unregister_chrdev(major,dev_name);
if(retv < 0)
{
printk("gpio_kdb unregister failed
");
return;
}
AT91_SYS->PIOB_PDR |= KK0 | KK1 | KK2 |KK3 |KK4 | KK5;
AT91_SYS->PIOB_IFDR |= KK0 | KK1 | KK2 |KK3 |KK4 | KK5;
AT91_SYS->PMC_PCDR = 0x1 << AT91C_ID_PIOB; //enable the mck clock;
printk("kdb goodbye
");
}
module_init(kdb_init_module);
module_exit(kdb_cleanup_module);
MODULE_AUTHOR("MZ");
MODULE_LICENSE("GPL");
U8 ReadKey( )
{
U8 KK;
KEY_FLAG = 0x00;
KK = (AT91_SYS->PIOB_PDSR & 0x3f000);
if((KK & KK0) == 0 )
{
Delay(TIME_KEY);
if((KK & KK0) == 0 )
KEY_FLAG |= key_PageDown_**;
}
if((KK & KK1) == 0 )
{
Delay(TIME_KEY);
if((KK & KK1) == 0 )
KEY_FLAG |= confirm_press_**;
}
if((KK & KK2) == 0 )
{
Delay(TIME_KEY);
if((KK & KK2) == 0 )
KEY_FLAG |= key_NumAdd_** ;
}
if((KK & KK3) == 0 )
{
Delay(TIME_KEY);
if((KK & KK3) == 0 )
KEY_FLAG |= key_NumSubb_**;
}
if((KK & KK4) == 0 )
{
Delay(TIME_KEY);
if((KK & KK4) == 0 )
KEY_FLAG |= cancel_press_**;
}
if((KK & KK5) == 0 )
{
Delay(TIME_KEY);
if((KK & KK5) == 0 )
KEY_FLAG |= key_PageUp_**;
}
return KEY_FLAG;
}
测试程序：
U8 KEY_FLAG = 0x00;
#define key_PageDown_** KEY_FLAG & (0x1<<0)
#define confirm_press_** KEY_FLAG & (0x1<<1)
#define key_NumAdd_** KEY_FLAG & (0x1<< 2)
#define key_NumSubb_** KEY_FLAG & (0x1<<3)
#define cancel_press_** KEY_FLAG & (0x1<<4)
#define key_PageUp_** KEY_FLAG & (0x1<<5)
void Delayms(int t)
{
short ms=0x1147;
short i,j;
for(j=0;j<t;++j)
for(i=0;i<ms;++i);
}
void Delay(int t)
{
while(--t);
}
int main(void)
{
int fd;
int count;
if((fd = open("/dev/kdb_dev",0)) < 0)
{
printf("can not open /dev/kdb_dev
");
exit(0);
}
printf("kbd fd is %d
",fd);
count = read(fd,&KEY_FLAG,sizeof(U8));
printf("key_flag is %x
",KEY_FLAG);
if(count != sizeof(U8))
{
printf("read ts error!
");
return 0;
}
while(1)
{
Delay(1000);
if(confirm_press_**)
printf("confirm key
");
else if(cancel_press_** )
printf("cancle key
");
else if( key_PageDown_**)
printf("page down
");
else if(key_PageUp_**)
printf("page up
");
else if(key_NumAdd_**)
printf("confirm key
");
else if(key_NumSubb_**)
printf("confirm key
");
else ；
}
测试程序循环执行，但是终端只显示confirm key ，各位高手看下是什么原因。
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