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	Thu May 18 10:20:55 2017 +0000
+++ b/Manchester.cpp	Thu May 18 13:37:21 2017 +0000
@@ -42,7 +42,7 @@
         PinName txPin, 
         PinName rxPin, 
         uint32_t speed  /* = 1200 bps */, 
-        uint8_t tol /* = 20% */ 
+        uint8_t tol     /* = 20% */ 
     ) : 
     _tx(txPin), 
     _rx(rxPin) {
@@ -161,8 +161,7 @@
 
 /**
  * @brief   Receives message
- * @note    Waits until a message is received
- *          or receive timeout occured
+ * @note    Waits until a message is received or 'receive timeout' occured
  * @param   msg   Container to store the received message
  * @retval  true  On success
  *          false Otherwise