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I2S - output main clock to codec
Posted: Sat Jan 28, 2017 11:44 pm
by ZaneKaminski
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?
Re: I2S - output main clock to codec
Posted: Sun Jan 29, 2017 2:45 am
by ESP_Sprite
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.
Re: I2S - output main clock to codec
Posted: Sat Mar 18, 2017 8:10 pm
by Volvox
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
