Vertical sync incorrect with PAL. about arduino-tvout

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i also had this issue with the TVOutBeta1... [ i couldn't get the earlier 
versions to sync at all ]

i can confirm that employing jon's fix detailed above corrected the issue for 
me.

Original comment by [email protected] on 18 Jan 2012 at 10:52

[GoogleCodeExporter]

The vertical sync is messed up regardless of NTSC or PAL, I have made some 
improvements to NTSC but i haven't tried with PAL yet.  Don't expect anything 
to soon however...

Original comment by [email protected] on 25 Jun 2012 at 1:36

• Changed state: Accepted

[GoogleCodeExporter]

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 1:38

[GoogleCodeExporter]

Hello! I had the same problem. arduino nano 328p (Chinese copy) and ebay rear 
camera display. Vertical sync was not working and the image was scrolling down. 
I changed this and it works! 2 days to go. The right TV, the image function 
properly, but here little 4, 3 inch, it will not begin operating 

"
I have fixed the v-sync problem in the video_gen.cpp 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 25 Feb 2014 at 7:23

[GoogleCodeExporter]

and yes. I had a PAL signal.

Original comment by [email protected] on 25 Feb 2014 at 7:24

[GoogleCodeExporter]

Works like a charm.

Original comment by [email protected] on 2 Aug 2014 at 11:21