I2S - output main clock to codec

ZaneKaminski
Posts: 7
Joined: Sat Jan 28, 2017 11:32 pm

I2S - output main clock to codec

Postby ZaneKaminski » Sat Jan 28, 2017 11:44 pm

Hello. I have reviewed the I2S driver API found in i2s.h, but I am still not sure about one detail. I need to output the a main clock (16.9344 MHz or 18.432 MHz) to my codec chip. I figured I would synthesize it with the Audio PLL and then configure the I/O mux to output the signal, but I can't find how to do this in the documentation. Am I on the right track? How do I do this?

ESP_Sprite
Posts: 8921
Joined: Thu Nov 26, 2015 4:08 am

Re: I2S - output main clock to codec

Postby ESP_Sprite » Sun Jan 29, 2017 2:45 am

Sorry, as is the audio PLL still is not documented. I also do not know if it's possible to route its output directly to a GPIO.

Volvox
Posts: 19
Joined: Sat Mar 18, 2017 7:54 pm

Re: I2S - output main clock to codec

Postby Volvox » Sat Mar 18, 2017 8:10 pm

As I can see in the new technical reference manual V1.5 the output of the master clock/apll output of both I2S peripherals should now be available via the IO_MUX to specific pin. I checked the actual pinmapping in the actual commit of IDF but I dont find the related i2sn_clk Makros for GPIO mapping documented in the io_mux_reg.h.
Can someone help with the related GPIO Pin and function_no for the mapping? Would be great ;)

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