[PD] Advice on creating an external object for controlling a DAC breakout board

[Alexandros]

Actually you're right, signal rate could be an overkill for something
like that. I'll go with control rate. Does your object use wiringPi? If
so, I'd go for creating a new object as wiringPi is now deprecated as
stated here http://wiringpi.com/news/ since the developer got bullied
about support and all. I'll try the pigpio software. Still, I'll give
your object a try and peek into the code, thanks!

Anyway, thanks for the hints!

Alexandros

On 15/8/20 10:02 μ.μ., Martin Peach wrote:
> Hi Alexandros,
> I made an external  [pii2c] which should be available via deken along
> with the source code. You could use that to talk to the dacs, but not
> at signal rate. What you want is already done by any 4-channel USB
> audio interface for much less hassle, and better resolution with [dac~
> 1 2 3 4]. The 4-DAC board could be used to provide control voltages
> for an analog synth or something like that at control rate (once per
> 64-sample block).
>
> Martin
>
> On Sat, Aug 15, 2020 at 2:25 AM Alexandros <adrcki at gmail.com> wrote:
>> I want to create an external object to control a quad DAC board with a Raspberry Pi, namely this one. As the object should run at signal rate, I'm confused as to how I should control the rate of values sent to the DAC.
>>
>> Since all signal objects in Pd work on DSP ticks, processing as many samples as the block size as fast as possible, how should I go about sending values to the DAC on a one-sample based clock? Is resampling the way to go? If so, how can this be done? I'm checking the source files, specifically d_dac.c and m_pd.h, but can't make much out of it. My C skills are very limited, hence all the questions above...
>>
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