On Fri, Jan 09, 2015 at 06:13:43PM +0530, Ssagarr Patil wrote: > Hi Maxime, > > Thanks for your response! > > > On Fri, Jan 09, 2015 at 03:45:01PM +0530, Ssagarr Patil wrote: > >> > >> Hi Maxime, > >> > >>>>> Thanks for the pointer, I am using spi_write() call and I see /dev/fb0 node created. > >>>>> but when I do echo "1121"> /dev/fb0 nothing comes up on oled any pointers on this ? > >>>> > >>>> You can't use it like that. It's a standard framebuffer, that is > >>>> represented as an array of pixels, so you need to use a font rendering > >>>> software if you want to output some text. > >>>> > >>> can fbtest > >>> (https://git.kernel.org/cgit/linux/kernel/git/geert/fbtest.git/) > >>> be used to to draw something ? > >>> > >> how do I set pixels of it ? Please if you can point me to some stuff that would be helpful. > > > > Last time I tried, fbtest didn't support monochrome display. > > > > And you'll find anything you need in the documentation. > > https://www.kernel.org/doc/Documentation/fb/framebuffer.txt > > > > In my case I see that init is done but I dont see any pixels on the > screen at all. > > I am now concerned if the driver was tested in first place ? No. I just submitted some good looking code that never ever got tested. More seriously, There's a few thing that comes to my mind: - Your controller doesn't behave the same way than the ones already supported. - You haven't posted your changes yet, so maybe you're not doing the transfers right - Your SPI controller is doing something weird What happens if you plug a logical analyzer on the bus? Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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