Improvement: Fix vertical sync pulses about arduino-tvout

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Original comment by [email protected] on 17 Oct 2010 at 4:27

• Added labels: Milestone-Release1.0, Priority-Low, Type-Defect
• Removed labels: Priority-Medium, Type-Enhancement

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To do after Beta 1.0 release.

Original comment by [email protected] on 25 Nov 2010 at 3:09

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Well I tried to get vsync on my TV by setting pal_line_stop-vsync to 2 and 2.5. 
I did not get any output. I tested from 3 to 7 with increments of 0.5 but the 
PAL output still rolls up. At a higher value 34.5 it kind of gets distorted a 
bit in the Hsync 

Original comment by [email protected] on 2 Oct 2011 at 6:46

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So how shall I get vsync..any ideas?

Original comment by [email protected] on 2 Oct 2011 at 6:46

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I have fixed the v-Sync-problem in the video_gen.cpp on line 98

original: 
void vsync_line() {
    if (display.scanLine >= display.lines_frame) {
        OCR1A = _CYCLES_VIRT_SYNC;
        display.scanLine = 0;
Fixed:
void vsync_line() {
    if (display.scanLine >= display.lines_frame) {
        OCR1A = _CYCLES_VIRT_SYNC;
        display.scanLine = -1

Original comment by [email protected] on 26 Nov 2013 at 3:22

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I can confirm the above fixed everything for me.

Original comment by [email protected] on 23 Jan 2014 at 4:22

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It fixed the problem (mega2560).
In my case it was line #204.

Original comment by [email protected] on 14 Apr 2014 at 10:07