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rmt: support invert RMT signal by GPIO matrix

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morris
2021-02-19 17:38:03 +08:00
parent 7b37158ede
commit efa92cb204
3 changed files with 34 additions and 11 deletions
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docs/en/api-reference/peripherals/rmt.rst
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@@ -119,6 +119,7 @@ Common Parameters
* Extra miscellaneous parameters for the channel can be set in the **flags**.
* When **RMT_CHANNEL_FLAGS_AWARE_DFS** is set, RMT channel will take REF_TICK or XTAL as source clock. The benefit is, RMT channel can continue work even when APB clock is changing. See :doc:`power_management <../system/power_management>` for more information.
* When **RMT_CHANNEL_FLAGS_INVERT_SIG** is set, the driver will invert the RMT signal sending to or receiving from the channel. It just works like an external inverter connected to the GPIO of certain RMT channel.
* A **clock divider**, that will determine the range of pulse length generated by the RMT transmitter or discriminated by the receiver. Selected by setting **clk_div** to a value within [1 .. 255] range. The RMT source clock is typically APB CLK, 80Mhz by default. But when **RMT_CHANNEL_FLAGS_AWARE_DFS** is set in **flags**, RMT source clock is changed to REF_TICK or XTAL.
@@ -234,7 +235,7 @@ Previously described function :cpp:func:`rmt_config` provides a convenient way t
Parameters Common to Transmit and Receive Mode
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
* Selection of a GPIO pin number on the input or output of the RMT - :cpp:func:`rmt_set_pin`
* Selection of a GPIO pin number on the input or output of the RMT - :cpp:func:`rmt_set_gpio`
* Number of memory blocks allocated for the incoming or outgoing data - :cpp:func:`rmt_set_mem_pd`
* Setting of the clock divider - :cpp:func:`rmt_set_clk_div`
* Selection of the clock source, note that currently one clock source is supported, the APB clock which is 80Mhz - :cpp:func:`rmt_set_source_clk`