Struct Decoder

pub struct Decoder { /* private fields */ }

Decode a Manchester encoded stream of periodically taken samples into a datagram.

Implementations

impl Decoder

pub const fn new( activity_level: ActivityLevel, sync_on_turning_edge: SyncOnTurningEdge, bit_order: BitOrder, ) -> Self

Create an instance of a new manchester encoder

Arguments

• activity_level - Low and High indicate what the activity level is the negation of the activity level is the inactivity level where no datagram is transmitted.
• sync_on_turning_edge - Indication if on the First or the Second edge bits are aligned.
• bit_order - Either BigEndian (MSP is received first) or LittleEndian (LSB is received first) In combination of activity_level and sync_on_turning_edge it is determined what if the first bit is either zero or one

Activity level	Sync on turning edge	Resulting first bit datagram
High	First	Zero
High	Second	One
Low	First	One
Low	Second	Zero

pub fn next(&mut self, sample: bool) -> Option<Datagram>

Sample a manchester modulated signal periodically and extract datagrams

To cover some jitter the sampling rate is three times the half bit frequency i.e. an Infrared manchester decoded bit lasts 2x 889 us), Thus sampling period should be 296 us.

Note: three times the bit frequency is good enough to consider the Nyquist criterion and some potential jitter in sending frequency.

Arguments

• sample - the level of the pin true equals high, false equals low

Returns

Option of an infrared datagram

• None - if no complete datagram is received
• Some(datagram) - a completely received datagram