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Topics - jrmymllr

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TFTs / Writing to display is slow
« on: April 27, 2015, 09:55:36 AM »
I'm using NHD-1.8-128160EF-CTXI-F at 3.3V for everything.

I found the PIC32 example code and adapted it for my micro and can write to the display.  The problem is the speed I can write to it.  I have to add a lot of delay between driving /WR low and /WR high, on the order of 50uS.  Reducing this delay causes the display to simply be inoperable.  In looking at the datasheet I see that all timing parameters are well under 1uS.  Writing to the entire display takes about 5 seconds, which seems too slow. 

The way I'm writing to the display is setting the D/C and data bus lines, then driving /WR low, delay, then drive /WR high.  I have also tried driving /WR low, then setting D/C and data lines, etc. but this made little difference.

The signals at the LCD look good on a scope with nice sharp edges.  I've used LCDs before and can't fathom what I'm doing wrong!


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