[Grbl_Esp32 Issue#666] Anyone have problems with GPIO33,25,26,27,14 as control switch inputs? About GRBL HAL

Issue #666 | 状态: 已关闭 | 作者: stvcmhr | 创建时间: 2020-11-12

I have probe, door, start, hold, and reset connected to GPIO33, 25, 26, 27, 14 respectively. They are correctly called out in my machine definition file. When running, grbl shows them as all active (i.e. low). There is some signal conditioning circuitry (series 100 ohm resistor, 10K pullup, 100nf cap to ground). When I check them with a voltmeter, they are low. They aren’t connected to switches yet, so that isn’t the issue. Is there a chance that they aren’t being correctly configured as inputs?

Any help would be appreciated.

Thanks,

Steve

#1 – bdring 于 2020-11-12

Do they switch states when activated?

If so, you can invert the logic in config.h

https://github.com/bdring/GrblEsp32/blob/ec5c95919f738a61399d518d21b61a324579817b/GrblEsp32/src/Config.h#L55

#2 – stvcmhr 于 2020-11-12

They do not appear to change state when I drive the pin high or low. I can drive the pin high by connecting it to 3.3v with a low resistor (220 ohm). I verify that it is high with a voltmeter. However, grbl reports it as low.

To be clear, I can drive the pin high or low, verified with a voltmeter, but grbl always reports them as low.

#3 – bdring 于 2020-11-12

Please paste your machine definition and startup text here.

https://github.com/bdring/Grbl_Esp32/wiki/Requesting-Help#boot-messages

#4 – stvcmhr 于 2020-11-12

I will post the machine definition, but I’m not sure what you mean by the startup text.

grblESP32board.h.txt

“C++ #pragma once // clang-format off


/*

    SCMlargeCNC_engraver.h
    Covers all V1 versions V1p0, V1p1, etc
    Part of Grbl_ESP32

    Pin assignments for the grblESP32board

	2020-09-16    - S. C. Maher
    Grbl_ESP32 is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation, either version 3 of the License, or

    (at your option) any later version.

    Grbl is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with Grbl_ESP32.  If not, see .

*/

#define MACHINE_NAME            "grblESP32board"
#ifdef N_AXIS

        #undef N_AXIS

#endif

#define N_AXIS 4
#ifdef ENABLESDCARD

    #undef ENABLESDCARD

#endif
// === Special Features
// I2S (steppers & other output-only pins)
#define USEI2SOUT

#define USEI2SSTEPS
#define I2SOUTBCK      GPIONUM22

#define I2SOUTWS       GPIONUM13

#define I2SOUTDATA     GPIONUM21
// stepper control pins
#define XSTEPPIN              I2SO(0)

#define XDIRECTIONPIN         I2SO(1)
#define YSTEPPIN              I2SO(2)

#define YDIRECTIONPIN         I2SO(3)
#define ZSTEPPIN              I2SO(4)

#define ZDIRECTIONPIN         I2SO(5)
#define ASTEPPIN              I2SO(6)

#define ADIRECTIONPIN         I2SO(7)
#define STEPPERSDISABLEPIN    I2SO(8)
// axis limit switch pins
#define XLIMITPIN             GPIONUM34

#define YLIMITPIN             GPIONUM35

#define ZLIMITPIN             GPIONUM36

#define ALIMITPIN             GPIONUM39
// spindle control
//#define SPINDLETYPE            SPINDLETYPE_HUANYANG // only one spindle at a time

#define SPINDLETYPE            SPINDLETYPE_PWM
#define VFDRS485TXDPIN		GPIONUM_17

#define VFDRS485RXDPIN		GPIONUM_4

#define VFDRS485RTSPIN		GPIONUM_16
#define SPINDLEOUTPUTPIN      GPIONUM17

#define SPINDLEENABLEPIN      GPIONUM16

#define SPINDLEDIRPIN         GPIONUM4
// probe
//#define PROBEPIN               GPIONUM_33
// coolant mist (probably used for dust collection)
#define COOLANTMISTPIN        I2SO(9)
// discrete control inputs
//#define CONTROLSAFETYDOORPIN GPIONUM_25

//#define CONTROLRESETPIN       GPIONUM14

//#define CONTROLFEEDHOLDPIN   GPIONUM_27

//#define CONTROLCYCLESTARTPIN GPIONUM_26
// === Default settings

#define DEFAULTSTEPPULSEMICROSECONDS I2SOUTUSECPER_PULSE

“

#5 – bdring 于 2020-11-12

The boot messages. Follow the link I provided.

#6 – stvcmhr 于 2020-11-12

I will grab the boot messages as soon as I get home. I don’t have access right now.

Thanks for the timely support!

Steve

#7 – bdring 于 2020-11-12

It looks like your control inputs are commented out.

These are all well tested and simple features. It is likely there is something wrong with your circuit or wiring.

#8 – stvcmhr 于 2020-11-12

I just commented them out last night to get the rest of the system going. They were not commended out when I did the testing. I agree there must be something wrong on my end. I was just wondering if there was anything special about those pins, as they can be capacitive inputs.

I’ll do more debug on my side before I waste any more of your time.

Thanks for all the hard work,

Steve

#9 – bdring 于 2020-11-12

Some pins have some special features and restrictions. See this page.

https://github.com/bdring/Grbl_Esp32/wiki/Setting-Up-the-I-O-Pins

#10 – stvcmhr 于 2020-11-17

Well, it turns out when you accidentally swap the 100 ohm series resistor with the 100nf parallel capacitor, things don’t work so well. Damn, those 0603 parts are tiny…

原始Issue: https://github.com/bdring/Grbl_Esp32/issues/666

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