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I can't find any information about I2S pins from ESP32 document .

Hi all, Did anybody test I2S RX? which pin should be used as DATA? I used example code in peripherals/i2s and changed it to RX mode, then use 'i2s_pop_sample()' to receive I2S data, but got none. i2s_config_t i2s_config = { .mode = I2S_MODE_SLAVE | I2S_MODE_RX, // Only RX .sample_rate = SAMPLE_RATE,...