enum - enumerate integer values into bits

       Andy Pugh

       If no bits are set the output value will be zero even if zero is a defined enumeration.

       Copyright © 2023 Andy Pugh. This is free software; see the source for copying conditions. There is NO
       warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

LinuxCNC                                           08/07/2025                                            ENUM(9)

enum converts integer values into bits and vice versa.

       The component is especially suitable for encoding and decoding register values for modbus devices, where
       control commands and status are frequently encoded as enumerations rather than bits. For example 0 =
       stop, 1 = forwards, 2 = backwards, 3 = jog-forwards etc.

       The pins created and the behaviour of the component are controlled by the load-time modparams "enums="
       and "names="

       The enums= parameter should be a comma-separated list of semicolon- separated pin labels. The enumerated
       values will increase in sequence starting at zero. To skip a value use a zero-length label, ie two
       consecutive semicolons, as shown in the examples.

       There should be no spaces in the "enums=" list.

       "names=" is an optional list of component instance names. If "names=" is omitted the functions and pins
       will be named "enum-decode...." or "enum-encode...."

       Taking the example configuration above, if enum-decode.01.enum2pin1-in is set to TRUE then the output pin
       enum-decode.01.output will be set to the value 2. If enum-decode.01.enum2pin2-in is set to true then the
       output would be 3.

       Conversely, if enum-encode.00.input is set to 4 then the pin enum-encode.00.enum1pin3-out will be set to
       TRUE.

enum-decode.NN - if instance type = "D"

       enum-encode.NN - if instance type = "E"

       enum - enumerate integer values into bits

       Preceding the list of labels should be the control-codes "D" for decode or "E" for encode. A D-type enum
       will set the value of HAL bit pins in response to changes to the enum-decode.NN.input value, whereas an
       E-type enum will set the value of the enum-encode.NN.output integer depending on which
       enum-encode.NN.label-bit value is set.

       If more than one label-bit input pin is set the output value will correspond to the pin label later in
       the list.

       E and D-type enumerations may be freely mixed in separate instances.

enum-decode.NN.input - The integer value to be decoded

       enum-decode.NN.label-out - output bits of a decode instance

       enum-decode.NN.label-val - The enumeration value corresponding to each specific bit output. These are
       populated in sequence during loading but may be over-ridden in HAL if convenient.

       enum-encode.NN.label-in - input bits of a decode instance

       enum-encode.NN.label-val - The enumeration value corresponding to each specified bit input. These are
       populated in sequence during loading but may be over-ridden in HAL if convenient.

       enum-decode.NN.output - The integer value corresponding to the set bit input.

       Report bugs to at the LinuxCNC github issues list: https://github.com/LinuxCNC/linuxcnc/issues

loadrtenumenums=E;enum1pin1;enum1pin2;;;enum1pin3,D;;;enum2pin1;enum2pin2[names=name1,name2]