7i92 outputs not responding

Hi folks, I have a 7i92 connected to a plasma cutter table I've built. The 7i92 has the G540x2 bitfile loaded, but I have most of the accessories turned off on the second connector (P1), as I'm using these pins mostly as GPIOs for things like limit switches and ohmic probing.

Motion control is working great, and inputs seem to work fine - the limit switches work for homing, the ohmic probing correctly senses when it closes the circuit with the material. The GPIO outputs, however, don't seem to allow me to change state, they are stuck outputting a logic level high (~4.975V).

In an attempt to debug this, I've created a barebones HAL configuration which is just loading hm2_eth and the bare minimum of other components to support it. I've loaded this using halrun, and attempted to toggle GPIO pins using setp:

But, all to no avail. The outputs stay stubbornly at logic high according to a DMM connected to the relevant pins. Interestingly, halmeter shows the pins changing! I tried playing with the is_output and is_opendrain pins too, but they didn't seem to make any difference.

I've attached a capture of my halrun session.


Am I missing something with how to configure the GPIO pins? Is this because I've turned off most of the components, do I need a different bitfile to use part of P1's pins as outputs?

Any and all suggestions and ideas greatly appreciated. Thanks!
-Rob

setp & getp are used for parameters
set & get are for pins

I used to mix them up

Good luck

Take no notice.......stupid me didn't RTFM properly

Nothing in your test file sets any second port bit to output mode

I really hope it's that simple! I'll try today and report back.

PCW wrote:

Nothing in your test file sets any second port bit to output mode

Do you mean because I'm using setp and not set, as mentioned above? Or something else? How would I set a pin to output mode, was I on the right track with setting is_output to TRUE?

Yes, any GPIO pin that needs to be an output must be explicitly set to output mode:

setp hm2_7i92.0.gpio.024.is_output true

I'm glad this appears to be such a simple solution. I will give this a try this afternoon. Thanks!

Unsurprisingly, this was definitely the problem. Thanks all!

oh ok...my bad, thanks

Could explain it a bit further, I misunderstood the docs.

I RTFM properly....now I get it.
Once again thanks for pointing that out.