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HDMI port on Raspberry Pi 4
#1
Is it possible to connect an external DAC to one of the two HDMI ports on the Raspberry Pi 4? Which port is HDMI 1, and is it located next to the USB-C power port?


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#2
The product brief shows the port locations and PCB designators
https://datasheets.raspberrypi.com/rpi4/...-brief.pdf

Code:
POWER  HDMI0  HDMI1

In RaspiOS physical ports HDMI0 and HDMI1 are assigned device labels HDMI 1 and HDMI 2.
In ALSA the HDMI ports are assigned labels b1 and b2 and assigned to card 0 and card 1 respectively.
The default HDMI config for RaspiOS is to only enable audio on HDMI 1.

Code:
pi@moode:~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
  Subdevices: 4/4
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
card 0: b1 [bcm2835 HDMI 1], device 1: bcm2835 HDMI 1 [bcm2835 HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
  Subdevices: 4/4
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
Enjoy the Music!
moodeaudio.org | Mastodon Feed | GitHub
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#3
Are the HDMI ports on the Raspberry Pi 4 I2S compatible?
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#4
I'm not sure what you mean by "compatible" given there is no protocol or wiring standard for I2S over HDMI.
Enjoy the Music!
moodeaudio.org | Mastodon Feed | GitHub
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#5
I'm wondering if Pi 4 has I2S LVDS via HDMI output built in. I have a DAC can select 4 different pinouts.
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