rotary switch + encoder as feed rate / incremental jog control using 4 inputs

I have a 4 position rotary switch and a 100ppR encoder - is it possible to have the rotary switch go between use of the encoder for feed rate selection and x / y / z incremental jog inputs? I have found examples for each use in isolation, but wanted to check the mode selection is viable before designing/wiring up my control panel. 

This is going into a 7i96s, and I intended to use (my last) 4 inputs:
IN0: encoder A
IN1: encoder B
IN2: selection bit 0
IN3: selection bit 1

I intend to wire the rotary switch to provide the 2 bit state (and use a LUT5?) to select between the feed / jog modes. I do have the encoder input spare on the 7i96s, but I intend to use this for the spindle later. 

Yes, there will definitely be a way.

Without looking in detail, I think that you can use the  demux  HAL component to decode the 2 bits into 4 separate jog-enable pins (well, one will be spindle override enable) 

halui.spindle.N.override.count-enable bit in (default: TRUE)When TRUE, modify spindle override when counts changes.halui.spindle.N.override.counts s32 incounts X scale = spindle override percentage

 axis.L.jog-counts IN S32Connect to the "counts" pin of an external encoder to use a physical jog wheel.axis.L.jog-enable IN BITWhen TRUE (and in manual mode), any change to "jog-counts" will result in motion. When false, "jog-counts" is ignored.

 joint.N.jog-counts IN S32Connect to the "counts" pin of an external encoder to use a physical jog wheel.joint.N.jog-enable IN BITWhen TRUE (and in manual mode), any change to "jog-counts" will result in motion. When false, "jog-counts" is ignored.

Thanks - it's feed rate override and not spindle that I want, but I'm assuming it will be similar.

Can't live without feed hold and feed rate override!

Note that you must use a pair of the first 8 I/O pins (in 0..7) on the 7I96S
to use the hardware MPG encoders:

IO Connections for TB3 -> 7I96_0
Pin#                  I/O   Pri. func    Sec. func        Chan     Sec. Pin func   Sec. Pin Dir

TB3-1                   0   IOPort       InM              0        Input0_EncA0    (In)
TB3-2                   1   IOPort       InM              0        Input1_EncB0    (In)
TB3-3                   2   IOPort       InM              0        Input2_EncA1    (In)
TB3-4                   3   IOPort       InM              0        Input3_EncB1    (In)
TB3-5                   4   IOPort       InM              0        Input4_EncA2    (In)
TB3-6                   5   IOPort       InM              0        Input5_EncB2    (In)
TB3-7                   6   IOPort       InM              0        Input6_EncA3    (In)
TB3-8                   7   IOPort       InM              0        Input7_EncB3    (In)
TB3-9                   8   IOPort       InM              0        Input8          (In)
TB3-10                  9   IOPort       InM              0        Input9          (In)
TB3-11                 10   IOPort       InM              0        Input10         (In)
TB3-13,14              11   IOPort       SSR              0        Out-00          (Out)
TB3-15,16              12   IOPort       SSR              0        Out-01          (Out)
TB3-17,18              13   IOPort       SSR              0        Out-02          (Out)
TB3-19,20              14   IOPort       SSR              0        Out-03          (Out)
TB3-21,22              15   IOPort       OutM             0        Output4         (Out)
TB3-23,24              16   IOPort       OutM             0        Output5         (Out)

 

OP - Have a look here.

forum.linuxcnc.org/47-hal-examples/48626...2-9-mpg-hal-s#267885

Do you mean hardware encoders on the 7i96s itself? Would it not work on input 9+10 at all?