GPIO switch

Hello KTTF,

Welcome aboard! The more you use SigmaStudio, the more you'll come to like it. You can perform your desired function with an arrangement like that shown below:

This runs on a ADAU1701MINIZ eval board, whose three push-buttons are each wired to a multipurpose pin on its -1701. The buttons ground these inputs when pressed, producing a "0" -- otherwise a "1" In turn, these pins are by default configured as GPIO digital inputs, so they're ready to use here.

Understanding the number formats in SigmaDSP helps immensely with projects such as yours -- please look up Brett's FAQ here: https://ez.analog.com/docs/DOC-3168

In the above schematic, the GPIO input controls a Mux, which selects between the 440 Hz tone oscillator and a "0" (silence). A Mux expects an integer or "28.0" format at its control input -- involving the least-significant bits in the DSP. On the other hand, the GPIO sends out a number "1" in "5.23" format -- the 1 appears at the 23rd bit toward the left (while zero is the same in any format). The easiest way to convert formats between a GPIO and a Mux is to use a Buffer Gate as shown above. For help with most algorithm blocks, select it and press F1.

The way the above project is set up, pressing the button nearest the eval board's output jack will enable the tone. Once you get this working, variations are limited only by your imagination -- siren and warble tones, etc. You can even play back a very short (a few mS) wave file, see https://ez.analog.com/docs/DOC-10801

Best regards,

Bob

Hello Robert,

thank you for your very fast answer. This is exactly what i was searching for:)

Best Regards

thank you, thank you, thank you
i've been trying to figure this out for 2 hours