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47 lines
1.8 KiB
Plaintext
47 lines
1.8 KiB
Plaintext
menu "I2S PDM Example Configuration"
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choice EXAMPLE_PDM_DIR
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prompt "I2S PDM direction"
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default EXAMPLE_PDM_TX
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help
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Select example PDM direction
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config EXAMPLE_PDM_TX
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bool "PDM TX"
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depends on SOC_I2S_SUPPORTS_PDM_TX
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help
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PDM TX example will play 'twinkle twinkle little star' in three tones.
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config EXAMPLE_PDM_RX
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bool "PDM RX"
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depends on SOC_I2S_SUPPORTS_PDM_RX
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help
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PDM RX example will show the received data from a PDM microphone.
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endchoice
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choice EXAMPLE_PDM_TX_LINE_MODE
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prompt "I2S PDM TX Line Mode"
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depends on EXAMPLE_PDM_TX && SOC_I2S_HW_VERSION_2
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default EXAMPLE_PDM_TX_CODEC
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help
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Decide to output PDM signal into a PDM codec or a low-pass filter
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config EXAMPLE_PDM_TX_CODEC
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bool "Codec line mode"
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help
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Output PDM signal to a PDM codec. The PDM clock signal is mandatory for PDM codec,
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the codec can differentiate the left and right sound channels by sampling data
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on positive or negative edges. That means the data of the left and right channels
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can coexist on a same data line.
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config EXAMPLE_PDM_TX_DAC
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bool "DAC line mode"
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help
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Output PDM signal to a low-pass filter, so that the low-pass filter can restore the PDM
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signal to analog wave. Therefore, each data line can only contains one sound channel,
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if both left and right channels are required, two data lines should be specified as well.
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Normally the PDM signal is not sufficient in DAC line mode.
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endchoice
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endmenu
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