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Update TrackManager.md

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Add note section about zero stretching
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Fred 2022-03-30 09:28:52 -04:00 committed by GitHub
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Release_Notes/TrackManager.md
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@ -19,13 +19,15 @@ In the default scenario of a single DCC track and a PROG track, the TM behaves a
The TM is able to handle up to 8 separate track domains. Each domain requires a hardware driver to supply track voltage. A typical motor driver shield supplies two tracks, which is what we have used in the past as main and prog.
Unlike the previous version where the shield channel A was always the DCC main and channel B was always the DCC prog track, TM allows :
Unlike the previous version of DCC++EX, where the shield channel A was always the DCC main and channel B was always the DCC prog track, TM allows :
- None, any or all the tracks can be DCC Main.
- None or ONE track may be DCC prog at any given time.
- Any track may be powered on or off independently of the others.
- Any track may be disconnected from the DCC signal and used as a DC track with a given loco address. (See DC discussion later)
With such flexibility comes responsibility... the scope for making mistakes is right there!
With such flexibility comes responsibility... the potential for making mistakes means taking extra care with your configuration!
**NOTE** TM does NOT use "zero stretching" to control your DC motor. Instead, it uses true Pulse Width Modulation (PWM) to efficiently run your loco using the same method a decoder uses to control a DCC loco's motor. DC locos can even run better on TM than they can on a normal analog throttle, especially at low speed, since it is always applying the full track voltage, albeit in pulses of varying duration.
## Using the Track Manager (DCC)
TM names the tracks A to H. In a default setup, you will normally have tracks A and B where A will default to be the DCC main signal and B will be the DCC prog.
@ -134,4 +136,4 @@ The TM code is primarily in TrackManager.cpp which is responsible for coordinati
Each individual track is handled by an instance of MotorDriver created from the MOTOPR_SHIELD_TYPE definition in config.h
Many functions formerly in the DCCWaveform code have been moved to TrackManager or MotorDriver, notably the power control and checking. This makes the code easier to follow.
Many functions formerly in the DCCWaveform code have been moved to TrackManager or MotorDriver, notably the power control and checking. This makes the code easier to follow.