Espressif ESP32 Technical Reference Manual page 345

12 I2S Controller (I2S)
31 26 25
0 0 0 0 0 0 0
I2S_TX_PDM_HP_BYPASS Set this bit to bypass the transmitter's PDM HP filter. (R/W)
I2S_RX_PDM_SINC_DSR_16_EN PDM downsampling rate for filter group 1 in receiver mode. (R/W)
1: downsampling rate = 128;
0: downsampling rate = 64.
I2S_TX_PDM_SIGMADELTA_IN_SHIFT Adjust the size of the input signal into filter module. (R/W)
0: divided by 2; 1: multiplied by 1; 2: multiplied by 2; 3: multiplied by 4.
I2S_TX_PDM_SINC_IN_SHIFT Adjust the size of the input signal into filter module. (R/W)
0: divided by 2; 1: multiplied by 1; 2: multiplied by 2; 3: multiplied by 4.
I2S_TX_PDM_LP_IN_SHIFT Adjust the size of the input signal into filter module. (R/W)
0: divided by 2; 1: multiplied by 1; 2: multiplied by 2; 3: multiplied by 4.
I2S_TX_PDM_HP_IN_SHIFT Adjust the size of the input signal into filter module. (R/W)
0: divided by 2; 1: multiplied by 1; 2: multiplied by 2; 3: multiplied by 4.
I2S_TX_PDM_SINC_OSR2 Upsampling rate = 64×i2s_tx_pdm_sinc_osr2 (R/W)
I2S_PDM2PCM_CONV_EN Set this bit to enable PDM-to-PCM converter. (R/W)
I2S_PCM2PDM_CONV_EN Set this bit to enable PCM-to-PDM converter. (R/W)
I2S_RX_PDM_EN Set this bit to enable receiver's PDM mode. (R/W)
I2S_TX_PDM_EN Set this bit to enable transmitter's PDM mode. (R/W)
31
0 0 0 0 0 0 0
I2S_TX_PDM_FP PCM-to-PDM converter's PDM frequency parameter. (R/W)
I2S_TX_PDM_FS PCM-to-PDM converter's PCM frequency parameter. (R/W)
Espressif Systems
Register 12.33. I2S_PDM_CONF_REG (0x00b4)
24 23 22 21 20 19 18 17
1 0x1 0x1 0x1 0x1
Register 12.34. I2S_PDM_FREQ_CONF_REG (0x00b8)
20 19
0 0 0 0 0
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16 15
0 0 0 0 0 0 0
10 9
960
345
8 7 4 3 2 1
0 0x02 1 1 0
441
ESP32 TRM (Version 5.2)
0
0
Reset
0
Reset