Zoltan Hudak / Manchester Featured

Manchester code (phase encoding) library.

Dependents:   Manchester_Transmitter Manchester_Receiver

Manchester code (phase encoding) library

It implements Manchester code according to both IEEE 802.3 and G.E. Thomas' conventions.

• A '0' is expressed by a high-to-low transition, a '1' by low-to-high transition in the IEEE 802.3 convention. The reverse is true in the G.E. Thomas' convention.
• The transitions which signify '0' or '1' occur at the midpoint of a period.
• Transitions at the start of a period are overhead and don't signify data.
• Least significant bit is sent first
• There are synchronization pulses (the number can be set) at the begin of transmission
  
  Select a convention to be used by commenting or uncommenting the line below in the Manchester.h header file.
  

#define G_E_THOMAS 1

The IEEE 802.3 convention is used by default.

A Manchester encoded message (using G.E. Thomas' convention), with one sync pulse in the preamble, carrying four bytes:

ACKNOWLEDGEMENT: The code in this library was based on this article published by Robert Guastella.

NOTE: To perform a simple test (without radio modules) connect the txPin on transmitter board to the rxPin on the receiver board and make sure that grounds are also connected one another.

--- a/Manchester.cpp	Wed May 17 07:52:15 2017 +0000
+++ b/Manchester.cpp	Wed May 17 08:17:13 2017 +0000
@@ -35,7 +35,7 @@
  * @param   txPin Pin name of transmitter line
  *          rxPin Pin name of receiver line
  *          speed Communication bit rate in bits per second
- *          tol Pulse width tolerance in %
+ *          tol   Pulse width tolerance (+/-) in %
  * @retval
  */
 Manchester::Manchester
@@ -147,7 +147,7 @@
 /**
  * @brief   Receives message
  * @note
- * @param   msg A container to store the received message
+ * @param   msg   Container to store the received message
  * @retval  true  On success
  *          false Otherwise
  */
@@ -187,7 +187,7 @@
 
 /**
  * @brief   ISR to handle reception
- * @note    Called on rise or fall on receiver line 
+ * @note    Called on signal rise or fall on receiver line 
  * @param
  * @retval
  */
@@ -270,3 +270,4 @@
         _state = ERROR; // Incomplete transmission
 }
 
+