Re: [microblaze-uclinux] Application Program to blink LEDs not working

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hello Kunal,

Kunal Kishore wrote:

> I am a newbie to drivers and struggling.
> I've written and installed the driver to blink LEDs with its 
> corresponding application program on the board . Both appear in the file 
> system of uclinux after it has been ported. Driver is registered 
> successfully during boot up.  But it's not working. I am still trying to 
> figure out where I've gone wrong. Application Program opens the driver 
> file successfully and everything goes well but finally it doesnt write 
> to LEDs. I am giving both the programs below. Please help me out.

[snip]


>     printk("Data from user %x hex\n", data);
>     outb(data, OUTPORT);

Is this printk() getting triggered, with correct data?

Can you write to the GPIO from e.g. XMD, using the mwr command:

$ xmd

% mwr 0x40020000 0xffffffff

and it lights the LED?

John
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