I try to make an oscilloscope with a AD converter
and Xwindows display. The X display is fast enough
to draw the data for sample rates up to 50 kHz.
But I think it is no good idea to draw and undraw
lines multiple times within a single vertical screen
sync of the display. This results in black stripes
running over the screen (like the wheel effect in
western movies)
Does anyone know about a hack which allows to synchronize
a process with the vsync of the screen. I would like
to have some code like:
while( runnig ){
read_digitizer_fifo();
sleep_until_vsync(); /* this would be great */
undraw_old_data_line();
draw_new_data_line();
}
Sure it is only possible when the X server runs on
the same host.
Walter Berthold
[EMAIL PROTECTED]
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