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docs: updates the dac part on ESP32S2.

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Closes https://github.com/espressif/esp-idf/issues/6333
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Michael (XIAO Xufeng)
2020-12-30 09:24:10 +08:00
parent 1760f47681
commit da2be51868
1 changed files with 8 additions and 1 deletions
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9
docs/en/api-reference/peripherals/dac.rst
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@@ -13,7 +13,14 @@ Overview
The DAC driver allows these channels to be set to arbitrary voltages.
The DAC channels can also be driven with DMA-style written sample data, via the :doc:`I2S driver <i2s>` when using the "built-in DAC mode".
.. only:: esp32
The DAC channels can also be driven with DMA-style written sample data by the digital controller, via the :doc:`I2S driver <i2s>` when using the "built-in DAC mode".
.. only:: esp32s2
The DAC channels can also be driven with DMA-style written sample data by the digital controller, however the driver does not supported this yet.
For other analog output options, see the :doc:`Sigma-delta Modulation module <sigmadelta>` and the :doc:`LED Control module <ledc>`. Both these modules produce high frequency PWM output, which can be hardware low-pass filtered in order to generate a lower frequency analog output.