GPIO AUX and Lua script

ArduPlane
, , , ,
2

First, you must configure the outputs as GPIO by setting these parameters:
SERVO10_FUNCTION,-1
SERVO11_FUNCTION,-1

Then this (untested) script should work:

local AUX2 = 51
local AUX3 = 52
local NUM_PINS = 2
local RUN_INTERVAL_MS = 5000

local BOOL_TO_UINT = { [true] = 1, [false] = 0 }
local MAV_SEVERITY = {
    EMERGENCY = 0,
    ALERT = 1,
    CRITICAL = 2,
    ERROR = 3,
    WARNING = 4,
    NOTICE = 5,
    INFO = 6,
    DEBUG = 7
}

gpio:pinMode(AUX2, 1) -- must be output for write to work
gpio:pinMode(AUX3, 1)

local state = 0

function update()
    gpio:write(AUX2, state & 0x01)
    gpio:write(AUX3, (state >> 1) & 0x01)

    local aux2_state = BOOL_TO_UINT[gpio:read(AUX2)]
    local aux3_state = BOOL_TO_UINT[gpio:read(AUX3)]

    gcs:send_text(MAV_SEVERITY.INFO, ('AUX3, AUX2: %d%d'):format(aux3_state, aux2_state))

    state = (state + 1) % (NUM_PINS ^ 2)
    return update, RUN_INTERVAL_MS
end

return update()