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Set a pin to high in GRBL #151

Closed Henrikastro closed 2 years ago

Henrikastro commented 2 years ago

So, I'm trying to add a button to the sender that I'm using so it triggers a relay in my circuit board and changes the level of a pin to high. I've been doing this by sending something like a "/F" to the Grbl and doing a DigitalWrite in the protocol.c whenever I received that string.

Now I'm transitioning to GrblHAL and I've been trying to do it the same way, but with the hal, I have no direct contact with the pins to do that. I've tried to do it using the hal struct, I tought that the port variable of it would be my answer but whenever I did a hal.port.digital_out(21, true) it would hit me with a guru meditation error, so I believe thats not the path I should be following.

If anyone can help me get to the pins or shed a light on a better way of doing this I would really apreciate it.

terjeio commented 2 years ago

If the driver/board has support for aux outputs you can use M62-M65 - no need to call hal.port.digital_out() which by the way may be a null pointer if no aux outputs are available (and cause a crash). Check the $pins command output, it will have entries like this if so:

[PIN:PB15,Aux out 0,P0]
[PIN:PB2,Aux out 1,P1]
[PIN:PA6,Aux out 2,P2]
[PIN:PA5,Aux out 3,P3]
...

Note that the id (P or port number) used for interacting with the pin is not the same as the MCU pin number.

If no aux outputs are available you may add them in the board map if you have free pins.

Henrikastro commented 2 years ago

I'm using an ESP32, I believe it should support M62-M65 but I get an error 20 when trying to run it, should I be enabling it somewhere before using it? Anyways, I think the aux outputs are my way of getting this to work in this case, thank you!

terjeio commented 2 years ago

I see now that no board maps has aux outputs defined. Adding #define AUXOUTPUT0_PIN 21 (or the pin number you want if not 21) to the one you use might work...

Henrikastro commented 2 years ago

After adding the #define HAS_IOPORTS and #define AUXOUTPUT0_PIN 21 to my map I was able to use hal.port.digital_out(0, true) and then I could control the pin status. Thank you so much!