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Document the new methods for mapping UART0 TX to GPIO2 #1467

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Jan 19, 2016
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Document the new methods for mapping UART0 TX to GPIO2 #1467

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2 changes: 2 additions & 0 deletions doc/reference.md
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Expand Up @@ -76,6 +76,8 @@ more than 20 milliseconds is not recommended.

`Serial1` uses UART1, TX pin is GPIO2. UART1 can not be used to receive data because normally it's RX pin is occupied for flash chip connection. To use `Serial1`, call `Serial1.begin(baudrate)`.

If `Serial1` is not used and `Serial` is not swapped - TX for UART0 can be mapped to GPIO2 instead by calling `Serial.set_tx(2)` after `Serial.begin` or directly with `Serial.begin(baud, config, mode, 2)`.

By default the diagnostic output from WiFi libraries is disabled when you call `Serial.begin`. To enable debug output again, call `Serial.setDebugOutput(true)`. To redirect debug output to `Serial1` instead, call `Serial1.setDebugOutput(true)`.

You also need to use `Serial.setDebugOutput(true)` to enable output from `printf()` function.
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