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GPIO pin to mute the Amp+

dirkc

October 20, 2015 17:53

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I read somewhere how to mute the Amp+ using one of the GPIO pins.
Can anyone please give me a hint?

What are the GPIO pins used for ?
BCM 2: I2C Data
BCM 3: I2C Clock
BCM 18 (Pin 12): ?
BCM 19: ... ?
BCM 20: ... ?
BCM 21: ... ?

Thanks in advance
Dirk

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3 comments

• 0
  
  HiFiBerry team October 20, 2015 18:54

  Hi Dirk,
  
  you can't mute the Amp over GPIO. You need to set the volume in alsamixer to 0.
  
  Best regards
  Daniel
• 0
  
  dirkc October 22, 2015 17:50

  Hi Daniel,
  
  can you please confirm that the Amp+ uses the following pins (BCM vs. physical Pins).
  So I can use all other pins?
  
  BCM 2: Pin 3 I2C Data
  BCM 3: Pin 5 I2C Clock
  BCM 18: Pin 12 PCM_C
  BCM 19: Pin 35 MISO
  BCM 20: Pin 38 MOSI
  BCM 21: Pin 40 SCLK
  
  Kind regards
  Dirk
• 0
  
  HiFiBerry team October 22, 2015 19:21

  Hi Dirk,
  
  I don't remember the physical pins, but you will find the mapping of GPIOs and physical pins on many web sites, e.g.
  http://www.raspberrypi-spy.co.uk/2012/06/simple-guide-to-the-rpi-gpio-header-and-pins/
  
  About the GPIOs and how to use them, please read this:
  https://www.hifiberry.com/guides/gpio-usage-of-the-hifiberry-products/
  
  This not only documents the GPIOs, but explains also what might be the restrictions of using additional GPIOs.
  
  Best regards
  Daniel