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| SSD1289 chipset problems http://forum.lcdinfo.com/viewtopic.php?f=6&t=2723 |
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| Author: | ftkalcevic [ Sat Sep 19, 2009 3:12 ] |
| Post subject: | SSD1289 chipset problems |
I got a cheap 320x240 RGB TFT with the SSD1289 chipset on ebay and I'm having some problems. The Green isn't working as I expect. If I run the display in 64k colour mode, I can get a smooth Red and Blue gradient. Green, on the other hand, displays as 4 distinct gradients - green gradient is smooth but jumps in intensity in the 4 blocks. 64k colour mode uses a mapped 16bit colour value, 5 red bits, 6 green bits and 5 blue bits. I've double checked I've mapped green correctly. I was originally thinking I have a faulty display (it was from ebay after all), but I'm having another strange problem with Green when I try 262k colour mode. In this mode, theoretically, I should send 3 bytes for the RGB values, only the bottom 6 bits are used. However, the display is only using 2 bytes - Red and Blue. If I send 3 bytes, the 3rd byte is used as the first part of the next pixel. Green never displays at all in this mode, no matter what values I send. I've gone over the initialisation code. I've tried samples for other displays, but no luck. I've read the documenation and can't see anything that describes what I am seeing. Any ideas? Thanks, Frank |
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| Author: | maan3k [ Tue Mar 30, 2010 13:02 ] |
| Post subject: | Re: SSD1289 chipset problems |
ftkalcevic wrote: I got a cheap 320x240 RGB TFT with the SSD1289 chipset on ebay and I'm having some problems. The Green isn't working as I expect.
If I run the display in 64k colour mode, I can get a smooth Red and Blue gradient. Green, on the other hand, displays as 4 distinct gradients - green gradient is smooth but jumps in ..... Any ideas? Thanks, Frank Hi ,,, I have been using the SSD1289 based 3.2" TFTs with 16-bit 8080 i/f but never have been problem ,, Looks like you are using 8-bit interface !!! because I've been facing the same RGB issue with other TFT with 8-bit 8080 IF ... By the ways ,,,, see my great hacks of Nokia color TFTs on Sparkfun ,, regards maan |
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