[time-nuts] Simple open source microcontroller solution to tune DDS needed

[jimlux]

On 12/13/17 12:56 PM, Richard (Rick) Karlquist wrote:
> I should have said AD9832.  But that was just an example
> that would work.  I may choose a different one for whatever
> reason.
> 
> Regarding the Arduino board:  that is what I would call
> a "daughter" board, which I can't have.  Is the Arduino
> board open source, so that I can just copy the schematic
> of it to my own board?  Is the Arduino software also
> open source?
> 

yes to both.

There's also a fair amount of "non arduino" software that runs on the 
arduino hardware platform (whether ATMEGA or Freescale or some other ARM 
processor).

The pjrc.com teensy is available with pins sticking out, so you can 
mount it like a sort of thicker than normal wide DIP.

I've built standalone designs inheriting the processor schematic from 
the pjrc.com Teensy series (which use the Freescale parts which have a 
built in USB interface, useful for me).

If you're used to cross compilers using the usual GCC toolsets, and 
such, then you don't need the Arduino IDE environment (although it *is* 
easy, and gives you a nice prototyping platform).  You can program most 
of these chips using the JTAG interface, assuming you have a JTAG pod of 
some sort.  That gives you a single chip solution that still has a 
fairly clean development environment.







> Rick
> 
> On 12/13/2017 12:47 PM, Clint Jay wrote:
>> I think maybe you might have meant the AD9835 ?
>>
>> Anyway, there are plenty of code examples out there, do you have a
>> processor in mind or are you free to use whatever is suggested?
>>
>>
>>
>> On 13 Dec 2017 20:03, "Richard (Rick) Karlquist" <richard at karlquist.com>
>> wrote:
>>
>>> I need a very simple controller to tune a DDS with up/down
>>> switches (imagine setting the time on a clock).  A DDS
>>> chip, such as an AD9836 would go on a PC board and a couple
>>> of pushbuttons would tell the controller to tune up or
>>> down.
>>>
>>> Before reinventing this wheel, I thought I would see if
>>> anyone knows of a similar solution that can be leveraged.
>>> What I would like is both hardware and software, where
>>> the software could be edited to accommodate the up/down
>>> buttons.  A last resort would be to write software from
>>> scratch.  My software skills are extremely limited.
>>> Cutting and pasting code might work for me.
>>>
>>> I need to be able to embed this onto an existing PC board.
>>> I can't use a preexisting "daughter" card, other than
>>> to copy the design of the card.
>>>
>>> Rick Karlquist
>>> N6RK
>>>
>>>
>>>
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