[sdiy] PWM DAC techniques

[Tom Wiltshire]

Dammit, he's right.

Get the DAC and be done with it.

T.

On 2 Aug 2010, at 16:46, Olivier Gillet wrote:

> <snip>
> Those things are extremely evil, and I'm sorry to have somehow
> encouraged you on this sloppy path. Indeed, there are two
> motivations for using internal PWM instead of a DAC:
> 1/ Get rid of the overhead of chitchatting with the DAC (packet
> formatting, SPI, mini state machine to do a round-robin on several
> control signals to output...), which can amount to 20 cycles.
> 2/ Cost
> 
> PWM of PWM will have some overhead, so if you do PWM for reason 1/,
> you'll be in trouble anyway. If you factor out the pain of filtering
> your output signals, 2/ is not a very valid reason.
> 
> Olivier
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