I had a hard time getting this code to work. It wasn't sync'ing, and I had to drop the delays down really far to get it to be stable. Something like:
ntscDelayHSyncStart 3 us
ntscDelayBackPorch 1 us
ntscDelayFrontPorch 1 us
ntscDelayPerLine 2*21 us
ntscDelayVSync 25 us
Is it common to have this problem (not sync'ing -- screen is a rapidly moving mess of short horizontal lines) with the original values? Does this mean my board is slower than standard? Or that something else is slowing it?
> Is it possible that arduino timing has changed?
Perhaps delayMicroseconds was significantly changed over the past couple years? I just compared 0007 and 0017... The only difference I see is the addition of a local variable and saving/restoring the interrupts SREG. Just a few clock cycles I would think.
- Duemilanove with ATmega328
- arduino version 0017
Also... i modified the code to allow interactive changing of the delay values, and then to allow 4x the precision in delay values. I could post this messy code if anyone else has trouble with the "standard" delay values; let me know.
Thanks for the code and for any advice about why I'd need much smaller delays!