the new ESP32-C5 and P4 support 16 channel 32 bit TDM in full duplex

[MCH]

Don't know what the implications are (hope someone does), but i believe that previous ESP32 were limited in bit depth as channel number grows, or full duplex availability.... P4 is a beast with 3 such i2s peripherials (the link below is mistaken, the datasheet confirms 3). Looking forward to what can be done with it.

Inter-IC Sound (I2S) - ESP32-P4 - — ESP-IDF Programming Guide v5.2 documentation

 

[phofman]

IIUC the maximum APLL is 160MHz, while :

Due to hardware limitation, when setting the clock configuration for a slave role, please be aware that <span>i2s_tdm_clk_config_t::bclk_div</span> should not be smaller than 8

IIUC that would mean max bclk of 20MHz - which would be quite slow. 20MHz / 32 bits / 48kHz = 13 channels 32bit TDM max at 48kHz. There are 3 I2S interfaces, but I would be cautious about overall performance of the DMA to fetch so much data.

 

[MCH]

Thanks for the input. Seems still quite reasonable for a chip normally well documented, cheap, and easy to implement. I would be already very happy if it allows to build a simple usb multichannel DDC/DAC, and seems that someone was already working on it:

espressif/usb_device_uac • v1.2.2 • ESP Component Registry

Detail of component espressif/usb_device_uac - 1.2.2

components.espressif.com

 

[phofman]

seems that someone was already working on i

IMHO that code seem quite incomplete - e.g. all out endpoints define async mode, yet I could not find any corresponding async feedback endpoint and its handling.

 

[MCH]

@phofman have a look, here is an example of 2 channels uac, apparently working. I stay confident that they will continue developing the multichannel one

esp-iot-solution/examples/usb/device/usb_uac at master · espressif/esp-iot-solution

Espressif IoT Library. IoT Device Drivers, Documentations and Solutions. - espressif/esp-iot-solution

github.com