Portable Displays?

peepo

How to feed data from logi to portable display?
hints or demo-code appreciated!


have ordered as generic:

http://www.adafruit.com/product/1601

seems this type may cover some of the LogiPi pins?



I also have DFRobot RoboPeak usb display:

http://www.robopeak.com/blog/?p=406
blits to fb1 framebuffer

any other models in use, or being considered?

perhaps we might add a wiki page?

~:"

apologies if this should by now be within my grasp....

jpiat

Hi,

i have been looking at those display (the SPI based ones like adafruit HAT); but never used them with the LOGI-Pi. The main issue is that the display uses the only SPI port and its two slave select pins pllus some GPIO. The SPI port is used for the FPGA loading on the LOGI-Pi so i don't think that you can use it anymore to load the FPGA. One possible solution could be to have a way of deactivate the SPI display, load the FPGA and re-activate the SPI display. This oculd be achieved byt boot ing the Pi without the display driver loaded, load teh FPGA, reboot the Pi with display enabled ...
The other problem is that the SPI port is used for the communication with the FPGA in most of our example projects. We could well rely on the serial port for the communication (at least for the demo requiring low bandwidth) to solve this issue.

The other display you propose (USB based) will work fine with the LOGI-Pi (at least on the hardware side), i'l order to one see if there are any additional steps for the install. The main issue with those display, is that they put the frame rendering job on the CPU instead of the GPU when using HDMI.

Another solution is to use display such as http://www.adafruit.com/products/2260 or http://hdmipi.com/ and will work just as a regular HDMI display.

I think the best solution will come from the Rpi foundation when they finally decide to use the DSI to connect a nice display ...


Regards,

Jonathan Piat

peepo

RoboPeak usb display
latest arm build for RPi2 I found:
http://forums.pimoroni.com/t/dfrobot-2-8-usb-tft-pi-2-raspbian-setup-guide-advanced/594
then do not use rpi-update at all?

for framebuffer use /dev/fb1:
https://gist.github.com/akoskovacs/9ca900d0979fcc12580d
visible and addressable window is 0,0 to 318,239

lapses to sleep mode after a few minutes.
touch does not seem to wake up.
have asked if there is a way to turn off, etc...

I do not use X11
edit /etc/rpusbdisp/rpusbdispd.sh comment out:
# ensure_lightdm_running
# daemon
edit /boot/cmdline.txt add:
fbcon=font:ProFont6x11 fbcon=map:1

there is an SDK that supposedly does not need kernel module.
I did not try, but...

peepo

to prevent display going to sleep
sudo apt-get install console-tools
edit /etc/console-tools/config:
BLANK_TIME=0
POWERDOWN_TIME=0