oneblade
Posts: 3
Joined: Mon Nov 24, 2014 4:13 pm

Re: Sainsmart 3.2" (SSD1289) framebuffer driver

Tue Dec 09, 2014 5:05 pm

I designed something like this:

Image
Is the SPI will work with ssd1289 and software 2014-06-20-wheezy-raspbian-2014-07-25-fbtft-master-firmware? Is such a connection is correct? I am an experienced electronics engineer so I will be grateful for your help because I'm losing hope already in the running tft.

notro
Posts: 686
Joined: Tue Oct 16, 2012 6:21 pm
Location: Drammen, Norway

Re: Sainsmart 3.2" (SSD1289) framebuffer driver

Tue Dec 09, 2014 5:17 pm

I can't see the image.

2014-06-20-wheezy-raspbian-2014-07-25-fbtft-master-firmware supports with the FBTFT SPI interface circuit: modprobe fbtft_device name=sainsmart32_spi

https://github.com/notro/fbtft/wiki/SPI ... ce-circuit

oneblade
Posts: 3
Joined: Mon Nov 24, 2014 4:13 pm

Re: Sainsmart 3.2" (SSD1289) framebuffer driver

Sat Dec 27, 2014 9:44 pm

oneblade wrote:I designed something like this:

Image
Is the SPI will work with ssd1289 and software 2014-06-20-wheezy-raspbian-2014-07-25-fbtft-master-firmware? Is such a connection is correct? I am an experienced electronics engineer so I will be grateful for your help because I'm losing hope already in the running tft.
Can anybody verify that the scheme from the previous post has a chance to work? I have done according to https://github.com/notro/fbtft/wiki/SPI ... ce-circuit but it does not work. Is there something wrong connected?

notro
Posts: 686
Joined: Tue Oct 16, 2012 6:21 pm
Location: Drammen, Norway

Re: Sainsmart 3.2" (SSD1289) framebuffer driver

Sat Dec 27, 2014 10:28 pm

You can write to spidev and see if it comes out correctly on the parallel bus:
echo -e "\x00\xFF" > /dev/spidev0.0
If that is correct, there's WR and CS left. If you don't have a logic analyzer, I think it will be difficult to verify WR. It's a long time since I worked on this circuit. I don't remember the details anymore.

If everything looks fine, I would try the display directly with the parallel interface to be sure the display is fine.

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