Where can i ask re asm programming problem with bcd subtraction

[tasmod]

Thanks Mike,

Unfortunately I've already tried that routine but nothing changes. I've tried looking for my error but I'm now dizzy with it.

As it's a direct step before sending the byte to the LCD i assumed it should at least mess up the display tens digits.

The 'tens' value are in just one BCD packed byte.

I have the code working as a direct rf signal generator using one of the cheap ebay dds boards. Total cost of parts about 10 pounds sterling.

I would like to utilise it as a vfo for a homebrew rig but displaying 0 on the display when the dds is giving out 9mhz. The dds and display would then track up in tandem. This would match the 'i f' then.

It seems a shame to start again with PBP when I have full working asm code. I may just try to get the 'freq word' out to the dds using PBP in a test situation.

Rob G4NQX

[Mike, K8LH]

Hi Rob,

I wouldn't mind taking a closer look. Can you post a sample five byte packed BCD frequency value? Also, are you using a fixed or absolute address for the five byte frequency variable? And, are you subtracting a "constant" 9000000 value or will that be a variable value?

Regards, Mike, K8LH

[tasmod]

Hi Mike,

Apologies, I've been away a few days.

I've sent you a PM including my email address, so as not to clutter up the forum.

Rob G4NQX