Re: Si4734 Hardware and Software Guides

Roy <roy.dyball@...>


Thank you for putting me straight about the SPI connection to the MCU.

Am I correct in assuming that you are only using the daughter board alone and not the base board connected to the daughter board? Is the daughter board available on its own from Mouser?

Scott what version of C are you using. Is the Si labs development environment and tools all one would need to get an interface working with the ability to slot in my own code? Are the PC-USB libraries included in the development environment?

I will probably order one of these MCU boards and have a go. There goes another life time LOL. I will look forward to your results with the new board. I also thought it made good sense to utilise the existing USB connector on the 380 or the 310.

Cheers Roy.--- In ultralightdx@..., "sdwillingham" wrote:
> Roy,
> A clarification: the code in the reference design I linked to
> is actually operating the chip in 3-wire mode. It nicely makes
> use of the MCU's SPI interface hardware, but the incoming and
> outgoing serial data lines are actually connected together with
> a 1 kohm resistor (see the schematic in the app note).
> I actually used a version of that code example in the first
> version of my interface. That said, I'm back to bit-banging
> with my current software.
> Yesterday, one of these arrived at my house from Mouser:
> It's quite a lot bigger than my present prototype, but should be
> easier to work with in terms of solder points, etc. Last night
> I determined that if I cut off the bottom third of the board
> (where the potentiometer and switch are), I will be able to fit
> the remainder inside my PL-380. (These Tecsuns are remarkable
> in their packaging design -- very little wasted space and yet
> very easy to dis- and re-assemble.) The PL-380's built-in USB
> connector will make this a very stealth modification!
> -Scott-
> --- In ultralightdx@..., "Roy" roy.dyball@ wrote:
> > Because the Tecsun uses the 3 wire interface I feel it is best to stick
> > with it while they use it because I can unhook my interface, and as soon
> > as I switch the local MCU control lines back in it takes over without a
> > fuss and you can still use any changes you have made until power down
> > while using the radio normally.
> >
> > I am really leaning toward using an MCU like you are doing and am
> > looking forward to seeing your final results. I noticed you have posted
> > more pictures and your radio with interface looks good now it is back
> > together.
> >

Join to automatically receive all group messages.