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34 lines
1.4 KiB
ReStructuredText
34 lines
1.4 KiB
ReStructuredText
Sigma-delta Modulation
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======================
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Introduction
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------------
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ESP32 has a second-order sigma-delta modulation module. This driver configures the channels of the sigma-delta module.
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Functionality Overview
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----------------------
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There are eight independent sigma-delta modulation channels identified with :cpp:type:`sigmadelta_channel_t`. Each channel is capable to output the binary, hardware generated signal with the sigma-delta modulation.
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Selected channel should be set up by providing configuration parameters in :cpp:type:`sigmadelta_config_t` and then applying this configuration with :cpp:func:`sigmadelta_config`.
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Another option is to call individual functions, that will configure all required parameters one by one:
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* **Prescaler** of the sigma-delta generator - :cpp:func:`sigmadelta_set_prescale`
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* **Duty** of the output signal - :cpp:func:`sigmadelta_set_duty`
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* **GPIO pin** to output modulated signal - :cpp:func:`sigmadelta_set_pin`
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The range of the 'duty' input parameter of :cpp:func:`sigmadelta_set_duty` is from -128 to 127 (eight bit signed integer). If zero value is set, then the output signal's duty will be about 50%, see description of :cpp:func:`sigmadelta_set_duty`.
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Application Example
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-------------------
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Sigma-delta Modulation example: :example:`peripherals/sigmadelta`.
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API Reference
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-------------
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.. include:: /_build/inc/sigmadelta.inc
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.. include:: /_build/inc/sigmadelta_types.inc
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