为什么驱动程序会影响在终端命令行退出不了系统呢!
int screen_open(struct inode *inode,struct file *filp){
unsigned int cnt = 0x00;
printk(KERN_ALERT "%s:%s,%s\n", __FUNCTION__,__DATE__,__TIME__);
//for ( cnt = 0; cnt < SCREEN_IO_NUM; cnt++ )
{
writel( PORTB_VALUE(screen_io_table), led_screen_base + PIO_PER );
writel( PORTB_VALUE(screen_io_table), led_screen_base + PIO_PUER );
writel( PORTB_VALUE(screen_io_table), led_screen_base + PIO_ODSR );
writel( PORTB_VALUE(screen_io_table), led_screen_base + PIO_OER );
}
return 0;
}
为什么我驱动里面有循环的话
然后应用程序运行的话
终端不能通过按
CTRL+C来结束呢 int screen_open(struct inode *inode,struct file *filp)
{
unsigned int value = 0;
printk(KERN_ALERT "%s:%s,%s\r\n", __FUNCTION__,__DATE__,__TIME__);
value = SCREEN_SCK |
SCREEN_STB |
SCREEN_DAT |
SCREEN_DSR |
SCREEN_IRM |
SCREEN_A |
SCREEN_B |
SCREEN_C |
SCREEN_D;
writel( value, led_screen_base + PIO_IDR );
writel( value, led_screen_base + PIO_PUDR );// pull up
writel( value, led_screen_base + PIO_SODR );
writel( value, led_screen_base + PIO_PER );
//writel( value, led_screen_base + PIO_OER );
return 0;
}
我现在该成这样了!
屏蔽掉就能退出,但是IO输出不了
不屏蔽掉,不能退出终端,IO可以输出!
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