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rpi-dcc-decoder's Introduction

rpi-dcc-decoder

Raspberry Pi NMRA DCC Decoder Hardware and Software

A hardware and software design to connect a Raspberry Pi to a NMRA compliant DCC system, decode the DCC signal and display the output on the screen. As-is it is a "DCC Sniffer", but with minor modification could be used to turn the Raspberry Pi into a stationary decoder.

See HARDWARE.md for the circuit design to connect a Raspberry Pi to the tracks of an NMRA compliant DCC system.

The software uses the pigpio library. Inspired by Frequency Counter 1.

This software is under the BSD 2-clause license, see LICENSE.

Building

make

Running

./dcc_decode 5 -s1

Runs on GPIO 5, with a 1us poller. Use 1us for the best performance.

DCC Reference Documents

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rpi-dcc-decoder's Issues

Wrong DCC min and max timing?

Hi
I tried to use your code to decode DCC on my model railroad. Your code is well documented, but what I don't understand is the timing for the DCC min and max

#define TICKS_MIN_DCC_ONE   12
#define TICKS_MAX_DCC_ONE   38
#define TICKS_MIN_DCC_ZERO  68
#define TICKS_MAX_DCC_ZERO 150

Has NMRA DCC other timings than OpenDCC? As defined in OpenDCC, a one has 58microseconds and a zero 116 microseconds.
OpenDCC Protocol

Thanks

Kind regards

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