GPIO AUX and Lua script

ArduPlane
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1

Hi there,
I thought it would be easy to get information through GPIO AUX ports !
I’m currently using Mission Planner 1.3.81 build 1.3.87, ArduPlane V4.4.0 Cube Orange; SCR_ENABLE = 1

In that version BRD_PWM_COUNT doesn’t exist anymore.
My Code tries to affect Pin 2 and 3, and to read it, but unfortunatly nothing happens when I put it to HIGH (3-5V). On the screen I have always “Blue Green = 10” with or without avtivating the pins. (Im using rangefinder on 5-6 and it’s working nicely )

Blockquote
gpio:pinMode(51,0) – AUX 2
gpio:pinMode(52,0) – set AUX 3 to input, gpio:pinMode(51,1) would be output

local Blue = false
local Green = false

function update()

Green = gpio:read(51)
Blue = gpio:read(52)

if not Blue and not Green then
	gcs:send_text(0, "Blue Green = 00 OK")
elseif Blue and not Green then
	gcs:send_text(0, "Blue Green = 10")
elseif not Blue and Green then
	gcs:send_text(0, "Blue Green = 01")
elseif Blue and Green then
	gcs:send_text(0, "Blue Green = 11 STOP")
else
	gcs:send_text(0, "Aucune correspondace")

end

return update, 5000 – boucle 5 secondes

end

return update()

Blockquote

Thanks for help or Advice

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()
3

Hi Yuri, Thanks a lot ! Yes your code is working : the states are changing one by one !

In my case I had some difficulties linked to the fact that I discovered that if you dont force the Signal Pin to “LOW” by linking to “GND”, the state will be “HIGH”. If you leave it alone it’s HIGH… initially I thought that if no Signal it would be LOW but NO.

In my case to be abble to read the signal sent to the GPIO I have set

@Yuri_Rage I was planning to use 51 & 52 (see picture)

AUX
AUX750×650 58.1 KB

You asked me to put
SERVO10_FUNCTION,-1
SERVO11_FUNCTION,-1

If I wanted to use 50, should I’ve put SERVO9_FUNCTION,-1 ?

Thanks

4

Correct. Glad you’re on track now.

5

Thanks Yuri, I wish you would be my neighbour ! :slight_smile: :rofl:

6

If I wanted to generate a pulse when RC11 is high for example, from one of the Main out or Aux pins. The next pulse will only happen when the user switches RC11 to low first and then high again. Do I still need to configure it as Relay style? Do I need to map the RC11_OPTION,28? or SERVO7_FUNCTION,-1 is sufficient.

How do I make a delay and change the pin state? Can I use the relay script commands, example toggle after a delay?

# https://ardupilot.org/copter/docs/common-gpios.html#version-4-2-and-later
BRD_PWM_VOLT_SEL,0 # 3.3V
RC11_OPTION,28 # Relay1 On/Off
RELAY1_DEFAULT,0
RELAY1_FUNCTION,1 # Relay, save and refresh
RELAY1_PIN,107 # MainOut7
SERVO1_FUNCTION,33 # M1
SERVO2_FUNCTION,34 # M2
SERVO3_FUNCTION,35 # M3
SERVO4_FUNCTION,36 # M4
SERVO5_FUNCTION,37 # M5
SERVO6_FUNCTION,38 # M6
SERVO7_FUNCTION,-1 # setting a PWM/SERVO/MOTOR output to be a GPIO function

image

7

okay, I managed to get it working. RCx_OPTION can only map to one selection. That is 28 or 301. Since I need to detect the RC11 edge trigger, low to high to generate an update, TOGGLE_DELAY to create the pulse, I map it to 301.

then I use the relay:enabled and the relay:toggle to do the jobs. I cannot use rc:run_aux_function(28, flip_flop).

Power, I follow this external 5v servo rail power connection.

RC11_OPTION,301

scripting_rc_2 = rc:find_channel_for_option(301)

g_toggle_relay = 1
relay:enabled(RELAY_NUM)
relay:toggle(RELAY_NUM)
return update, TOGGLE_DELAY