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#define SAMPLERATE  48000
#define BITS	16
#define NUMCHANNELS 2
i2s_config_t i2s_config = {
	                .mode = I2S_MODE_MASTER | I2S_MODE_RX,
	                .sample_rate = SAMPLERATE,
	                .bits_per_sample = BITS,
	                .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
	                .communication_format = I2S_COMM_FORMAT_STAND_MSB,
	                .dma_buf_count = 4,
	                .dma_buf_len = 240,
	                .use_apll = true,
			.fixed_mclk = 256 * SAMPLERATE,
			.tx_desc_auto_clear = true,
	                .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1                                //Interrupt level 1
	};

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//I2S pinout example configuration
	i2s_pin_config_t pin_config = {
	                .bck_io_num = 5,//BIT CLOCK(TO PIN 8 BCK IN PCM1808)
	                .ws_io_num = 25,//LR CLOCK(TO PIN 7 LRCK IN PCM1808)
			.mck_io_num = 0,//MASTER CLOCK(TO PIN 6 SCKI IN PCM1808)
	                .data_out_num = -1,//(NOT USED)
	                .data_in_num = 35//DATA IN(FROM PIN 9 DOUT IN PCM1808)
	};
 	ESP_ERROR_CHECK(i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL));
 	//this optional line reconfigures the default I2S asignment pins:
  	ESP_ERROR_CHECK(i2s_set_pin(I2S_NUM_0, &pin_config));
  	//this optional line configures the default MCLK rate:
  	ESP_ERROR_CHECK( i2s_set_clk(I2S_NUM_0, SAMPLERATE, BITS, NUMCHANNELS) );