Calculate tuning value for the AD9850 DDS.

[Mike, K8LH]

Very interesting. Thank you. I'm not a PBP user so I had no idea inserting an assembly code function into a PBP program was that easy.

I suspect you're coding for an 18F which has RRCF and RRNCF instructions where my example was for an "enhanced mid-range" 16F1823 device which has slightly different RRF, ASRF, and LSRF instructions. Hopefully, those 16F instructions are supported in PBP. Also, when using assembly language, careful attention to banking is required. I found XC8 assigned the 'ftw' variable in Bank 0 RAM and the other variables were assigned in the "common" 0x70..0x7F area.

One might conclude that implementing an assembly language method in a program could save hundreds of words of program memory and thousands of instruction cycles processing time but it also requires careful attention to detail and environment.

Hopefully, someone may be able to take advantage of a similar method in their PBP AD9850/AD9851 or Si5351 Digital VFO project.

Cheerful regards, Mike, K8LH