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Altera_Forum
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16 years ago

uCLinux NIOSII LCD 16207 problem

Hi all, I'm very new uClinux user. I'm playing with an Altera DE2 kit, trying to make working an example found in the NIOSWIKI (http://www.nioswiki.com/operatingsystems/uclinux/lcd_16207...
Altera_Forum's avatar
Altera_Forum
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16 years ago

Hi,

I also have a DE2 and have been trying to get the LCD working. I followed the wiki. (I had no missing files.) The kernel compiled with the driver ok but I could not see the boot message (hello!). I tried the writef example and the lcd16207 example. Neither worked.

I had to make the following modification to bypass the cache in the driver code in lcd_16207.h:

# define ADR_LCD_COMMAND na_lcd_16207_0 + 0x80000000# define ADR_LCD_READY (na_lcd_16207_0 + 0x80000000 +4)# define ADR_LCD_DATA (na_lcd_16207_0 + 0x80000000 + 8)# define ADR_LCD_READ (na_lcd_16207_0 + 0x80000000 + 12)

Now, after the kernel boots, I see the "hello!" message on the LCD. ( I had the driver built into the kernel, not a module) The writef example works and the lcd16207 example works.

For the second example, the string to be displayed is entered on the command line (and not 1234... as I first thought)

>lcd16207 abcdefg

Your symptoms seem a bit different but I hope this can help anyway.

Jeanne