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notro / fbtft

Linux Framebuffer drivers for small TFT LCD display modules. Development has moved to https://git.kernel.org/cgit/linux/kernel/git/gregkh/staging.git/tree/drivers/staging/fbtft?h=staging-testing
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HX8257 support? #99

Closed vtni closed 10 years ago

vtni commented 10 years ago

Hi,

would it possible for you to build a driver for a display like this? http://www.ebay.com/itm/251173169883?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

i bought it, but i have not the knowlage to make a driver for the raspberrypi, like you.

thank you, it would be great :)

notro commented 10 years ago

Sorry, but FBTFT doesn't have support for 24-bit RGB interface. And on the Raspberry Pi, there isn't enough GPIOs to drive such a display directly.

vtni commented 10 years ago

of course, i would one or two SPI/I2C port extender.

emozz commented 10 years ago

I think it can work. This is my initial thoughts maybe full of errors:

  1. Hardware: for the ripple counter we need to make the clock cycle longer. So instead of the 16 clock cycles its going to be 32 clock cycles. Therefore, you will have 64 bits being sent each clock cycle.
  2. the driver needs to edited to incorporate the changes made to the hardware because you will have alot of unused outputs from the shift registers.
  3. but the problem might be with the power supply . How much power does it need do you know ?
vtni commented 10 years ago

hi, thanks for your answer. unfortunately i'm not very knowledgeable about changing the drivers or code, but the display needs 5V. the background lighting works well while i can work on the raspberry, i couldn't more tested yet.

notro commented 10 years ago

Closing issue since there has been no activity for more than 2 months. Reopen if needed.