BLavery
Bottom quarter of my display is colour noise
Hi, Not sure how to contact you, but found your code and I have been trying to get it working on my PI. I have the RED PCB version of the display, and when I run your example-tft144-rpi-only.py the picture appears to be shifted up by 25% (top quarter is missing) and the bottom quarter of the display is just random colour pixels. My only changes in your code was to change the pin number to those that I have used (DC=23 LED =0 ).
Any suggestions as to what I have done wrong, or how I could fix it please? Thanks Chris
Hello Chris,
I'm in Indonesia at
present, totally unable to check
anything. I made a mention that it was for the BLACK PCB. The RED one looks
(from eBay pic) like it might be similar, but I did not
check it.
What I DO recall
was that I did read a post somewhere out on the
wide internet that was suggesting at least one board out
there (eBay presumably)
had a PCB wiring error, such that a hardware pin set
an option
that referenced an incorrect pixel XbyY. It was definitely for
that same control chip (ILI9163 or whatever) that
our red & black boards use. And that article said that
it WAS possible to counteract the hardware error by
software codes. It was for a driver written on another
website, and was likely in another programming
language
even. It might even have been arduino based.
Your symptoms could well be from this
incorrect pixel geometry. I do not have the
article reference - I would simply use google
to hunt down all references to the chip, and
trawl through what you find.
Easier
might be to simply bite the bullet and get
another board, but the black one.
Sorry.
If
you choose to try to hunt down the
article and the error
and its supposed software hack fix,
then you could publish that info for
others, or send it to me (back home
in March) to patch into the code I
have for the black board.
When the black board
works, its totally
cute.
Cheers
Brian
Lombok
Email?
I have various. They all get here!
A
good email for me is on the VirtGPIO
website (http://virtgpio.blavery.com)
Another is referenced
on the github stuff
at https://github.com/BLavery
But
I dont have YOURS. It says From = Chris Archer
<[email protected]> which looks not
likely to work.
So I hope this reply system gets there...
On 14/01/15 09:19, chrisarcher wrote:
Hi,
Not sure how to contact you, but found your code and I have been
trying to get it working on my PI.
I have the RED PCB version of the display, and when I run your
example-tft144-rpi-only.py the picture appears to be shifted up
by 25% (top quarter is missing) and the bottom quarter of the
display is just random colour pixels. My only changes in your
code was to change the pin number to those that I have used
(DC=23 LED =0 ).
Any suggestions as to what I have done wrong, or how I could
fix it please?
Thanks
Chris
—
Reply to this email directly or view it
on GitHub.
Looks like here is a correction for RED board (with its incorrect hardware optioning at factory). Thanks Lukas. IN DUE COURSE I'll add it into the posted code. Brian
On 19/03/15 10:16, Lukáš Chrást wrote:
Hello, I got myself a RED 128x128 1.44" display from eBay and I stumbled upon your python module. First of all, thanks for a nice code. I had the same problem as guy writing on issues page on you Github. And you were right, problem was wrong HW wiring with resolution 128x160px. After some time looking through your code, I was able to fix it by adding 2 simple lines into set_frame function: def set_frame(self, x1=0, x2=TFTWIDTH-1, y1=0, y2=TFTHEIGHT-1 ): y1=y1 + 32 y2=y2 + 32 self.write_command(SET_COLUMN_ADDRESS) self.write_data([0, x1, 0, x2]) self.write_command(SET_PAGE_ADDRESS) self.write_data([0,y1,0,y2]) Maybe you can include it in your code somehow. Anyway, thanks. Cheers, Lukas Chrast