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Fix typo (tree/three) in uart.rst
Merges https://github.com/espressif/esp-idf/pull/4237
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@ -22,7 +22,7 @@ The following overview describes functions and data types used to establish comm
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The minimum to make the UART working is to complete the first four steps, the last two steps are optional.
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The driver is identified by :cpp:type:`uart_port_t`, that corresponds to one of the tree UART controllers. Such identification is present in all the following function calls.
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The driver is identified by :cpp:type:`uart_port_t`, that corresponds to one of the three UART controllers. Such identification is present in all the following function calls.
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.. _uart-api-setting-communication-parameters:
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