{"id":594,"date":"2013-03-10T19:11:14","date_gmt":"2013-03-10T17:11:14","guid":{"rendered":"http:\/\/lallafa.de\/blog\/?p=594"},"modified":"2013-06-01T21:17:51","modified_gmt":"2013-06-01T19:17:51","slug":"watterott-mi0283qt-9a-display-for-the-rasbperry-pi","status":"publish","type":"post","link":"https:\/\/lallafa.de\/blog\/2013\/03\/watterott-mi0283qt-9a-display-for-the-rasbperry-pi\/","title":{"rendered":"Watterott MI0283QT-9A Display for the Rasbperry Pi"},"content":{"rendered":"

In my last post<\/a> I attached the Watterott Display to my Raspi. The model\u00c2\u00a0MI0283QT-2 I have here is not available anymore and was replaced with the newer\u00c2\u00a0MI0283QT-9A display modul<\/a>. Unfortunately, this new display uses a different graphics chip and thus the driver I wrote won’t work for these panels… \ud83d\ude41<\/p>\n

With my new display driver skills, I thought about adding this new module, too \ud83d\ude42 A few days ago I received this new model and on the weekend I finally found a little time to investigate the new driver code… The new chip is an ILI9341 and uses a 9 bit SPI protocol to receive its commands… Phew, sounds a bit strange but notro’s fbtft<\/a> driver framework again comes to the rescue: he has already supported the Adafruit22 which also uses 9 bit transfers and he also added an 9-bit SPI patch for the Raspi Linux kernel… With this starting point I was able to support the new display in a few hours:<\/p>\n

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Watterott's new MI0283QT-9A display running the boot console<\/p><\/div>\n

Since the display supports the Linux framebuffer interface its also possible to run X11 with Xorg’s framebuffer driver on it:<\/p>\n

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The display also runs the X11 desktop<\/p><\/div>\n

Again I was able to drive the display with a 32 MHz SPI clock (even 48 MHz works) and got a stable and smooth 25 fps for the 320×240 pixels in 16 Bit RGB.<\/p>\n

If you want to setup this display on your own Raspi then read on…<\/p>\n

<\/p>\n

Setup the ILI9341 driver<\/h3>\n

I won’t repeat all the details of the last driver setup as a lot steps are very similar. Just read the previous driver setup page<\/a> and then you’ll find the differences here:<\/p>\n