Electronic – Arduino: why does simple include not work

Arduino Mega hardware SPI pins are not located in the same place as on the ordinary Arduino. You will need to change the library.

While the Atmel app-note regarding Manchester encode/decode talks of 2 approaches - 1. Fast sampling 2. Using interrupts

My first attempt, as depicted by this question was using the Fast-sampling method, but not being able to make reasonable progress, and growing complexity of the sampling, decode, command-parsing logic, I switched over to the Interrupt method. If one follows the 'Linked Questions' one would find how I eventually solved it. In a nutshell, I found the interrupt method to be much simpler, and also, I think it is somewhat more reliable and robust against timing issues.