This repository contains the implementations of hardware-offline channel mappings. It defines a plugin called TPCChannelMap which consists of two functions:

get_offline_channel_from_crate_slot_fiber_chan: this translates from crate, slot, fiber and FEMB channel numbers into the offline channel number
get_plane_from_offline_channel: this translates from offline channel number into plane number

A table of available channel map plugins is listed here. One can use

cat CMakeLists.txt | sed -n "s/.*( \‍([^ ]*ChannelMap\‍).*/\1/p"

to see the channel maps that are being built (this may be a useful cross-check).

An example of using the channel maps plugin can be seen in dummy_map_test.cxx.