I use "Espressif IoT Development Framework. Official development framework for ESP32", i2s bck and ws is ok,but my adc need mclk,how can i open esp32 mclk? (stm32 cpu i2s include mclk, bck, ws ) thank you.
We do not have a separate mclk output from the i2S driver, sorry. If your I2S codec is happy with a non-synchronized mclk (which a fair few are, in my experience) you can generate this using e.g. the LED PWM module.
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