help!

Hi,

I am also looking at getting the LCD running, but i have absolute no idea.

Which ptf do you use ? I use the std_2c35.ptf, is that enough ? Or do i have to use the full featured one ?

Can you also elaborate how what state the code is in ? Is it working ?

I need some help and guide here.

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originally posted by snail1@Aug 8 2006, 09:06 PM

#include <linux/module.h># include <linux/errno.h># include <linux/cdev.h># include <linux/config.h># include <linux/types.h># include <linux/errno.h># include <linux/miscdevice.h># include <linux/slab.h># include <linux/ioport.h># include <linux/fcntl.h># include <linux/mc146818rtc.h># include <linux/netdevice.h># include <linux/sched.h># include <linux/delay.h>

# include <asm/io.h># include <asm/uaccess.h># include <asm/system.h># include <linux/delay.h>

# define lcd_on 1# define lcd_off 2# define lcd_clear 3# define lcd_reset 4# define lcd_cursor_left 5# define lcd_cursor_right 6# define lcd_disp_left 7# define lcd_disp_right 8# define lcd_get_cursor 9# define lcd_set_cursor 10# define lcd_home 11# define lcd_read 12# define lcd_write 13# define lcd_cursor_off 14# define lcd_cursor_on 15# define lcd_get_cursor_pos 16# define lcd_set_cursor_pos 17# define lcd_blink_off 18

# define klcd_ir na_lcd_16207_0# define klcd_dr (na_lcd_16207_0 + 8)

# define lcdwritedata(x) outl(x , klcd_dr)# define lcdwriteinst(x) outl(x , klcd_ir)

# define lcdreaddata inl(klcd_dr)# define lcdreadinst inl(klcd_ir)

# define major 250

static int device_open = 0;

static int lcd_16207_ioctl(struct inode *inode,struct file *filp,

unsigned int cmd,unsigned long arg);

static int lcd_16207_open(struct inode *inode,struct file *filp)

{

static int counter = 0;

if(device_open)return -ebusy;

device_open++;

printk("you have open the device %d times\n",counter++);

return 0;

}

static int lcd_16207_release(struct inode *inode,struct file *filp)

{

device_open--;

printk("you have release the device\n");

return 0;

}

static int lcd_16207_ioctl(struct inode *inode,struct file *filp,

unsigned int cmd,unsigned long arg)

{

volatile unsigned long display;

switch (cmd) {

case lcd_on:

if (copy_from_user

(&display, (unsigned long *) arg,

sizeof(display)))

return -efault;

lcdwriteinst(display);

break;

case lcd_off:

if (copy_from_user

(&display, (unsigned long *) arg,

sizeof(display)))

return -efault;

lcdwritedata(display);

break;

default:

return -einval;

}

return 0;

}

static struct file_operations lcd_16207_fops={

.ioctl = lcd_16207_ioctl,

.open = lcd_16207_open,

.release = lcd_16207_release,

};

static int lcd_16207_init(void)

{

int ret = register_chrdev(major,"lcd_pio",&lcd_16207_fops);

if(ret<0)

{

printk("registering the device failed with %d\n",major);

return major;

}

printk("you have init device %d\n",major);

return 0;

}

static void lcd_16207_exit(void)

{

if(unregister_chrdev(major,"lcd_pio"))

printk("exit failed");

}

module_init(lcd_16207_init);

module_exit(lcd_16207_exit);

module_author("andrew bose");

module_license("gpl");

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=17462)

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