LOGIC(9)

NAME
logic - LinuxCNC HAL component providing configurable logic functions

SYNOPSIS

loadrt logic [count=N|names=name1[,name2...]] personality=0xXXXX[,0xXXXX...]

count
    The number of logical gates.

names
    The named logical gates to create.

personality
    Comma separated list of hexadecimal number. Each number defines the behaviour of the individual logic gate. The list must have the same number of personalities as the N count.

DESCRIPTION

General ‘logic function’ component. Can perform ‘and’, ‘or’, ‘nand’, ‘nor’ and ‘xor’ of up to 16 inputs.

Determine the proper value for ‘personality’ by adding the inputs and outputs then convert to hex:

    • The number of input pins, usually from 2 to 16

    • 256 (0x100) if the ‘and’ output is desired

    • 512 (0x200) if the ‘or’ output is desired

    • 1024 (0x400) if the ‘xor’ (exclusive or) output is desired

    • 2048 (0x800) if the ‘nand’ output is desired

    • 4096 (0x1000) if the ‘nor’ output is desired

Outputs can be combined, for example 2 + 256 + 1024 = 1282 converted to hex would be 0x502 and would have two inputs and have both ‘xor’ and ‘and’ outputs.

FUNCTIONS

logic.N (requires a floating-point thread)
    Read the inputs and toggle the output bit.

PINS

logic.N.in-MM bit in (MM=00..personality & 0xff)

logic.N.and bit out [if personality & 0x100]

logic.N.or bit out [if personality & 0x200]

logic.N.xor bit out [if personality & 0x400]

logic.N.nand bit out [if personality & 0x800]

logic.N.nor bit out [if personality & 0x1000]

EXAMPLES

This is an OR circuit connected to three different signals, two inputs named sig-in-0 and sig-in-1, and one output named sig-out. First the circuit is defined, then its function is connected to the servo real time thread, last, its pins are connected to the wanted signals.

    loadrt logic count=1 personality=0x202
    addf logic.0 servo-thread
    net sig-in-0 => logic.0.in-00
    net sig-in-1 => logic.0.in-01
    net sig-out  <= logic.0.or

This is a named AND circuit with two inputs and one output.

    loadrt logic names=both personality=0x102
    addf both servo-thread
    net sig-in-0 => both.in-00
    net sig-in-1 => both.in-01
    net sig-out  <= both.and

SEE ALSO

and2(9), lut5(9), not(9), or2(9), xor2(9)

AUTHOR

Jeff Epler

LICENSE

GPL