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lbeck37 / u8glib

Automatically exported from code.google.com/p/u8glib
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ST7920 parallel mode too slow #79

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 

from the forum:

I'm using the library for the DFRobot ST7920 128 X 64 LCD and it works without 
a problem, both in serial as in parallel mode. But the weird thing is, is that 
the parallel mode is a bit slower. In SW serial I got a refresh rate of 6 to 7 
frames per sec and in 8bit it goes down to 4 to 5.

Is this normal behavior or am I doing something wrong?

Original issue reported on code.google.com by olikr...@gmail.com on 12 Jul 2012 at 5:37

GoogleCodeExporter commented 9 years ago 
Measure with FPS example

clear screen: seriel: 7.5, parallel: 5.5
@: seriel: 9.7, parallel: 6.5
pixel: seriel: 4.7, parallel: 3.8

Original comment by olikr...@gmail.com on 12 Aug 2012 at 1:20

GoogleCodeExporter commented 9 years ago 
changed to COM_FAST_PARALLEL mode

clear screen: 7.2
@: 9.1
pixel: 4.6

Original comment by olikr...@gmail.com on 12 Aug 2012 at 2:36