Hi, the GPCLK output for I2S MCLK would greatly increase value of RPi5 for audio. E.g. there are inexpensive SPDIF transmitters from China which require MCLK synchronous to the I2S. They would allow many interesting multichannel-audio projects.
Also many DACs/ADCs do not have an internal PLL from BCLK and require synchronous MCLK.
While there were several threads regarding exactly this issue, they were never completed to any solution:
viewtopic.php?p=2322636&hilit=gpclk#p2322636
viewtopic.php?p=2292682&hilit=gpclk#p2292682
viewtopic.php?p=2159223&hilit=gpclk#p2159223
Please has there been any development since then? Outputing the internal MCLK used for the I2S interface is really needed, RPi5 is not a brand-new offering anymore.
Thanks a lot to the RPi team for the necessary info!
Also many DACs/ADCs do not have an internal PLL from BCLK and require synchronous MCLK.
While there were several threads regarding exactly this issue, they were never completed to any solution:
viewtopic.php?p=2322636&hilit=gpclk#p2322636
viewtopic.php?p=2292682&hilit=gpclk#p2292682
viewtopic.php?p=2159223&hilit=gpclk#p2159223
Please has there been any development since then? Outputing the internal MCLK used for the I2S interface is really needed, RPi5 is not a brand-new offering anymore.
Thanks a lot to the RPi team for the necessary info!
Statistics: Posted by phofman — Thu Nov 06, 2025 7:35 am