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65 lines
2.1 KiB
Markdown
65 lines
2.1 KiB
Markdown
SoftSerial library
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==================
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The **SoftSerial** library is exactly the same as the **SoftwareSerial** library but used with the **TinyPinChange** library which allows to share
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the "Pin Change Interrupt" Vector.
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**SoftwareSerial** monopolizes the Pin Change Interrupt Vector and do not allow sharing.
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With **SoftSerial**, it's possible. Don't forget to #include **TinyPinChange** in your sketch!
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Additionally, for small devices such as **ATtiny85** (Digispark), it's possible to declare **the same pin for TX and RX**.
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Data direction is set by using the new **txMode()** and **rxMode()** methods.
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Some examples of use cases:
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-------------------------
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* **half-duplex bi-directional serial port on a single wire for debuging purpose**
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* **half-duplex serial port to interface with Bluetooth module**
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* **half-duplex serial port to interconnect an arduino with another one**
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Supported Arduinos:
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------------------
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* **ATmega368 (UNO)**
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* **ATmega2560 (MEGA)**
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* **ATtiny84 (Standalone)**
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* **ATtiny85 (Standalone or Digispark)**
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* **ATtiny167 (Digispark pro)**
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Tip and Tricks:
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--------------
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Develop your project on an arduino UNO or MEGA, and then shrink it by loading the sketch in an ATtiny or Digispark (pro).
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API/methods:
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-----------
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* The **SoftSerial** library uses the same API as the regular **SoftwareSerial** library:
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* begin()
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* end()
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* available()
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* read()
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* listen()
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* isListening()
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* overflow()
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* flush()
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* Two additional methods are used to manage the serial port on a single pin:
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* txMode()
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* rxMode()
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Design considerations:
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---------------------
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The **SoftSerial** library relies the **TinyPinChange** library **for the RX pin**. This one shall be included in the sketch as well.
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On the arduino MEGA, as all the pins do not support "pin change interrupt", only the following pins are supported **for the RX pin**:
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* 10 -> 15
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* 50 -> 53
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* A8 -> A15
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On other devices (ATmega328, ATtiny84, ATtiny85 and ATtiny167), all the pins are usable.
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Contact
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-------
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If you have some ideas of enhancement, please contact me by clicking on: [RC Navy](http://p.loussouarn.free.fr/contact.html).
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