Si5351 VFO/BFO Software: Part 2 Software overview 

That was such a great code explanation. Thank you. Though I'm not a programmer, after only 36 minutes and 29 seconds I now feel confident to go into that code to change levels for components, and add features, knowing exactly what to change, and add, and where. You perform a wonderful service putting all this gear together and explaining both the hardware and software.

Hi Charlie, thanks so much for doing the video's on the Si5351 hardware and code. Part 2 was of particular interest to me and explained things in a manner I could follow! It would be great if you could put the code up on your blog, I note there is some code on the Blog but not the code used in the part 2 video. I look forward to experimenting with the code and using it as a learning tool in conjunction with the excellent video you have produced. Kind regards form Andy...

Very interesting and entertaining, thanks! Things have become much simpler since I last tinkered with a homebrew DDS and having to drive it with a PIC chip programmed in Assembly language! I think I need to get myself a Si5351 board and start playing again! 73, Jacques ZS1PL

Just watched this video again ,alot makes sense now you explaining the software code ,Always learning here ,Thanks Charlie

I've found a rotary encoder library that uses a state machine. It stores the current state for the A and B encoder inputs, and compares the old state with the new to determine which way the knob was turned. So I call the same function when either of the two interrupts happen, read the state of the two pins, as a binary value of two bits, and call the update function that compares the new encoder state with the old and then outputs +1, -1, or 0 depending on the new position. (If you missed an interrupt you could end up with a net change of zero). I did things a bit different with the switch, I had each press of the switch change the increment value by 10x, and then rotate back to the original value (ie, 10hz, 100hz, 1khz, 10khz, 100khz, back to 10hz), but I like your idea of rotating the knob while the switch is pressed (but I wonder if that would cause faster wear on the mechanical encoder).

One little thing, you can banish all those "if (radix = x) radix =xx" lines in UpdateRot() with simple multiplication or division by 10. Not only will it make the code smaller it makes it more efficient. Time wasting within an ISR is always a bad thing so look for brevity! In pseudo code: if (button pressed) radix /= 10 or radix *= 10 depending on rotation.

Thanks for the video, a great description of your code, and easy to follow. 73 Tim VK5AV.

Thanks for sharing this program! And, if you don’t mind me asking, why don’t you use #define pushPin 4 ? That way it doesn’t take up valuable program space. Same goed for all the other ‘static’ defined stuff…

Hi Charlie....Thanks for that in-depth explanation....made me break out in a cold sweat, PTSD from trying to Java code this year and barely passing!! How do these scripts handle CW offset. I'm wanting to build a DDS for a rockmite but need a script that handles the off set for CW on transmit. Any idea where such a script might live or how to make it happen in the script? I have OLED and LCD screens ...it seems an LCD might be easier to start with? 73 de VK2AOE.

Not as pretty as the underline for the frequency shift, but have you considered inverting the background of the digit being changed? It would free up the segments below the frequency.

I like it

Could you put the link of your blog? Please

Hey Charlie! Wonderful explanation of the software. I tried running this code but couldn't find the KiquidCrystal_I2C.h library. I found one that is different by Author: Frank de Brabander and Maintainer: Marco Schwartz that doesn't work with your sketch as it has different commands eg., it doesn't even recognise LCD begin. Could you please guide me as to which library is to be used. Thanks. 73

Normally I enjoy programming, but not when it comes between me and making my radio work. I've stolen all of your code. Thank you for your public service :)

Hey Charlie, big follower of your stuff! Have you recently encountered any problems with this compiling? I think it’s due to the si5351 library being updated, as I’m getting a few errors with the set_freq signatures. Cheers and 73 VK3SVW Josh

Hi Charlie, I went to your blog spot to copy the sketch for the above project. The software for Jason code for the Si5351reference is there, but not the software above. Can you please give me some directions how to locate it please. DE vk2jcc 73

Hi Charlie found it.. 73

Excellent video! Is the code available?

please share code and schematic

Code and schematic please