85 lines
2.0 KiB
ReStructuredText
85 lines
2.0 KiB
ReStructuredText
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##########
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SigmaDelta
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##########
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About
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-----
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ESP32 provides a second-order sigma delta modulation module and 8 (4 for ESP32-C3)
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independent modulation channels. The channels are capable to output 1-bit
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signals (output index: 100 ~ 107) with sigma delta modulation.
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========= =============================
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ESP32 SoC Number of SigmaDelta channels
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========= =============================
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ESP32 8
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ESP32-S2 8
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ESP32-C3 4
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ESP32-S3 8
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========= =============================
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Arduino-ESP32 SigmaDelta API
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----------------------------
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sigmaDeltaSetup
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***************
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This function is used to setup the SigmaDelta channel frequency and resolution.
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.. code-block:: arduino
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double ledcSetup(uint8_t channel, double freq, uint8_t resolution_bits);
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* ``pin`` select GPIO pin.
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* ``channel`` select SigmaDelta channel.
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* ``freq`` select frequency.
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* range is 1-14 bits (1-20 bits for ESP32).
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This function will return ``frequency`` configured for the SigmaDelta channel.
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If ``0`` is returned, error occurs and the SigmaDelta channel was not configured.
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sigmaDeltaWrite
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***************
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This function is used to set duty for the SigmaDelta channel.
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.. code-block:: arduino
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void sigmaDeltaWrite(uint8_t channel, uint8_t duty);
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* ``channel`` select SigmaDelta channel.
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* ``duty`` select duty to be set for selected channel.
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sigmaDeltaRead
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**************
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This function is used to get configured duty for the SigmaDelta channel.
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.. code-block:: arduino
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uint8_t sigmaDeltaRead(uint8_t channel)
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* ``channnel`` select SigmaDelta channel.
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This function will return ``duty`` configured for the selected SigmaDelta channel.
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sigmaDeltaDetachPin
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*******************
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This function is used to detach pin from SigmaDelta.
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.. code-block:: arduino
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void sigmaDeltaDetachPin(uint8_t pin);
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* ``pin`` select GPIO pin.
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Example Applications
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********************
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Here is example use of SigmaDelta:
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.. literalinclude:: ../../../libraries/ESP32/examples/AnalogOut/SigmaDelta/SigmaDelta.ino
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:language: arduino
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