How to make io on/off(m42 pn s255/0) by just one macros

[huai3895]

How to make io on/off(m42 pn s255/0) by just one macros

by c or c++，i just need as thus：
if s=255
s=0
or
s=255

But idont know can gcode do that？
I read GCode Meta Commands，still find no way。（https://duet3d.dozuki.com/Wiki/GCode_Meta_Commands#Section_Programming_constructs）

huai

[oliof]

See https://forum.duet3d.com/topic/19799/toggle-gpio-with-external-trigger-on-off-on/4?_=1606417543586

[huai3895]

@oliof I m just too noob，that i need to know how to write it concrete
[I have use “OUT7” on duet3 6hc，M950 S2 C"OUT7"Q65535,And i try write this in macros ：
(If OUT7.pwm==0
M42 P2 S1
else
M42 P2 S0)
but it warn with:(Error: Failed to read code from macro Z-axis-brake: unexpected else in line 3)]
THANKS
huai

[Donpi]

@huai3895 can you post the code of your config.g where you create the pin ?

[huai3895]

@Donpi M950 P2 C"!OUT7" Q65535

[Donpi]

@huai3895 if you type/send

M42 P2 S1

in the console does it works ?

[OwenD]

@huai3895
Remove the brackets (...)

[huai3895]

@Donpi yes ,it works

[Donpi]

@huai3895 ok so like @OwenD said, I think that the problem are the ( )

[huai3895]

@Donpi the () just make easy to show you code,infact i never write it in my macros

[huai3895]

@huai3895 But i still find something:with duet3&raspberry pi(duet pi with GUI) ,M409 just report nothing, so mabe its just a bug with duet pi?