SiliconWizard
Posts: 1
Joined: Sat Nov 07, 2015 4:02 am

Official Touch Screen Not Working

Sat Nov 07, 2015 4:46 am

I recently bought one of the official Pi Foundation 7" touch screens designed for use with the Raspberry Pi.

So far, I've tried:

- turning it off and on again
- sudo apt-get update
- sudo apt-get upgrade
- sudo rpi-update
- rebooting
- disconnecting and reconnecting and checking the wiring

Still doesn't work. What could be wrong?

Notes:
This is with a a RPi 1-B.
By "doesn't work", I mean that the screen is completely dark.

fruitoftheloom
Posts: 21633
Joined: Tue Mar 25, 2014 12:40 pm
Location: Delightful Dorset

Re: Official Touch Screen Not Working

Sat Nov 07, 2015 2:20 pm

SiliconWizard wrote:I recently bought one of the official Pi Foundation 7" touch screens designed for use with the Raspberry Pi.

So far, I've tried:

- turning it off and on again
- sudo apt-get update
- sudo apt-get upgrade
- sudo rpi-update
- rebooting
- disconnecting and reconnecting and checking the wiring

Still doesn't work. What could be wrong?

Notes:
This is with a a RPi 1-B.
By "doesn't work", I mean that the screen is completely dark.
The RPi 1B has issues with the screen

viewtopic.php?f=108&t=120460
Retired disgracefully.....
......to a more gentile life !

jdb
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 2215
Joined: Thu Jul 11, 2013 2:37 pm

Re: Official Touch Screen Not Working

Sat Nov 07, 2015 5:15 pm

Latest firmware (rpi-update) has a somewhat roundabout way of supporting the DSI display on legacy products (B rev 1, B rev 2, A).

- Add the line

Code: Select all

ignore_lcd=0
to /boot/config.txt.

Connect the two spare jumpers supplied with the display to between the I2C pins on the GPIO header and SCL/SDA on the horizontal 0.1" pitch header on the display PCB. SCL to SCL, SDA to SDA.

Supply 5V power to the display directly - don't go through the Pi micro-USB port as the polyfuse is not rated for the current used by both the display and Pi.

NB: Both I2C buses are used by the GPU in this configuration. Attempting to use the ARM to do I2C transactions will lead to crashy behaviour due to interrupt races between the ARM and GPU.
Rockets are loud.
https://astro-pi.org

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