Date: Tue, 29 Dec 2015 14:22:13 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: Matthieu Volat <mazhe@alkumuna.eu> Cc: ticso@cicely.de, freebsd-arm@freebsd.org Subject: Re: Raspberry Pi and WaveShare SpotPear LCD screens Message-ID: <20151229132213.GB48795@cicely7.cicely.de> In-Reply-To: <F29722CA-C880-46F4-A3F2-48077A7B221D@alkumuna.eu> References: <36285EFC-0739-4A93-B22D-C22B7BDEE16D@alkumuna.eu> <20151228135554.GA45251@cicely7.cicely.de> <F29722CA-C880-46F4-A3F2-48077A7B221D@alkumuna.eu>
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On Mon, Dec 28, 2015 at 04:40:59PM +0100, Matthieu Volat wrote: > > > Le 28 déc. 2015 à 14:55, Bernd Walter <ticso@cicely7.cicely.de> a écrit : > > > [...] > > > > 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. > > > > Thanks, that's a very good summary. So if I understand well, we'd need to add a whole new class of framebuffer. That would be a good exercise, but I fear not having enough time/knowledge to do so... not soon at least. Or just a driver that copies over as done withLinux, which theoretically could also be done in userland. The advantage for copying vs. a new framebuffer is that the GPU features can be used for creating the image, but IIRC we don't support the GPU anyway. I have a complete set of their modules, including the HDMI with the exception of the 10.x" one, which wasn't available when I'd ordered them. But in my case I was under time Pressure, so I had to use Linux. > Thank you very much, I'll try to read a bit more about the fb devices in /usr/src/arm/bcm2835, as well as look a bit at the fbtft module in Linux staging area. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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