Raspberry Pi and WaveShare SpotPear LCD screens

[Bernd Walter]

On Mon, Dec 28, 2015 at 11:16:29AM +0100, Matthieu Volat wrote:
> Hi everybody,
> 
> I brought a WaveShare SpotPear LCD screen for my Raspberry Pi B+ board, having seen on the wiki page that LCD screen were working.
> 
> But this kind of screen uses the GPIO connectors rather than the dedicated display bus. It seems that even with Raspbian, it needs a special image to work.
> 
> The question is: does anybody have experience with those screens, would it simply require DFT modifications or something more? I cannot find sources on the supplement CD provided in the package.

Basicly they run with fixed configuration HDMI dummy output and then
copy the framebuffer over SPI to the display, which has it's own
displaymemory.
The board has some shift registers, so I'm guessing that the panel
itself uses a memory bus.
At least one GPIOs is used for backlight and I think there is an enable.
The touch controller is connected to I2C and needs it's own driver too.
Havn't worked out the details.
Easiest for you would be to use one of their bigger HDMI displays.
They have 5" and 7" and recently also 10.x".
Be aware that they have two 5" - one is connected to the GPIO header
for Power and I²C to run the touch controller.
The other one uses USB cables and an STM32 controller to run the touch
controller as an USB device - not sure if it is a standard device,
since I'd tested it with a Linux desktop and it didn't run out of the box.
I havn't run any FreeBSD with display yet.

-- 
B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.