In SX Microcontrollers, SX/B Compiler and SX-Key Tool, javalin wrote:

Hi PJV,

The issue goes away at 57600, even if the camera is running 57600 and the pc 115200.  Its bizzare that the error is always half way down a large picture "download".  Always in a repeatable pattern.  If I get the camera to slow down (I think it delay's between bytes), while still at 115200, the problem also goes away.

www.sxlist.com had some fragmented information on writing to pins at high speed, and using shadow registers - didn't really make total sense I must admit!

Thanks for your offer, but I dont want to waste your time fixing an issue in my code.  However, if you are willing, a short ISR example, with using the register-shadow technique would be enough for me to re-work my code to see if that cures the issue.

I will be relaying at different speeds, i.e. 115 to 19.2, however in short bursts and within the mostly within the buffer sizes.

Appreciate the help so far!!

James

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