Parallel port control pins less than 1V(output)

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3 years 11 months ago #255911 by TooTall18T
Parallel port control pins less than 1V(output) was created by TooTall18T
Hi, I'm not sure if this is the right place for my topic. If not feel free to move it.

At the moment I'm using a Longshine PCIe two port parallel port card at my milling machine. ( www.reichelt.de/2-port-parallel-pcie-kar...tct=pos_3&nbc=1&&r=1 )
Until now I didn't use the control pins 1, 14, 16 and 17 , but now I try to get them to work as outputs.

Both parallel ports are configured as "out" (loadrt hal_parport cfg="0 out 1 out") and all pins can be used correctly but not the four control pins.
If I use them as output I can toggle them in LinuxCNC but the voltage is less than 1V . As high signal. Every time I start the computer again I get a other voltage sometimes 0,235V, sometimes 0,755V or something in between. The other outputs have 3,3V .
I also tried not to use "parport_pc" and removed it with "sudo rmmod parport_pc" and use "loadrt hal_parport cfg="0x3008 out 0x3018 out" " instead. I only got a message in LinuxCNC "No parport registered at 0x3018. This is not always an error. Continuing.", but the card can be used like the way before.
With the ptest.hal/.xml I can not toggle the control pins. They stay at 0V .

I have tried to set the parallel port to a other mode by using modprobe (spp, ecp, epp), but I can't see any changes. Is anywhere a file or a program output where I can see the actual setting of the mode?
If I change the settings in hal to "in" or "x" I can see that all pins change there function how it should be, but the control pins have still less than 1V .

Today I could test the card on Windows XP and Mach3 .
The control outputs have 1,6V that is more than on Linux but still not enough to switch the Schmidt-Trigger. And on Windows the input pins have a pull up resistor(2,4V) but not at Linux.


During my search for solutions, I saw that I'm not the only one using a card with the chipset.
I'm working at this problem some days and now I'm out of ideas.
Maybe I did something wrong and someone here can see it.

Code:
Linux linuxcnc 4.19.0-22-rt-amd64 #1 SMP PREEMPT RT Debian 4.19.260-1 (2022-09-29) x86_64 GNU/Linux


sudo lspci -vv
Code:
11:00.0 Parallel controller: MosChip Semiconductor Technology Ltd. PCI 9865 Multi-I/O Controller (prog-if 03 [IEEE1284])     Subsystem: Device a000:2000     Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx-     Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-     Latency: 32, Cache Line Size: 32 bytes     Interrupt: pin A routed to IRQ 16     Region 0: I/O ports at 3008 [size=8]     Region 1: I/O ports at 3000 [size=8]     Region 2: Memory at dc101000 (32-bit, non-prefetchable) [size=4K]     Region 4: Memory at dc100000 (32-bit, non-prefetchable) [size=4K]     Capabilities: [48] Power Management version 2         Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot-,D3cold+)         Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-     Kernel driver in use: parport_pc     Kernel modules: parport_pc 11:00.2 Parallel controller: MosChip Semiconductor Technology Ltd. PCI 9865 Multi-I/O Controller (prog-if 03 [IEEE1284])     Subsystem: Device a000:2000     Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx-     Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-     Latency: 32, Cache Line Size: 32 bytes     Interrupt: pin C routed to IRQ 18     Region 0: I/O ports at 3018 [size=8]     Region 1: I/O ports at 3010 [size=8]     Region 2: Memory at dc103000 (32-bit, non-prefetchable) [size=4K]     Region 4: Memory at dc102000 (32-bit, non-prefetchable) [size=4K]     Capabilities: [48] Power Management version 2         Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot-,D3cold+)         Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-     Kernel driver in use: parport_pc     Kernel modules: parport_pc

sudo dmesg |grep parp
Code:
[   14.304480] parport0: PC-style at 0x3008, irq 16 [PCSPP,TRISTATE,EPP] [   14.399507] parport1: PC-style at 0x3018, irq 18 [PCSPP,TRISTATE,EPP]


cnc-para.hal
Code:
# Generated by stepconf 1.1 at Mon Apr 12 17:09:52 2021 # Änderungen an dieser Datei werden beim nächsten # overwritten when you run stepconf again loadrt [KINS]KINEMATICS loadrt [EMCMOT]EMCMOT base_period_nsec=[EMCMOT]BASE_PERIOD servo_period_nsec=[EMCMOT]SERVO_PERIOD num_joints=[KINS]JOINTS loadrt hal_parport cfg="0 out 1 out" ###loadrt hal_parport cfg="0x3008 out 0x3018 out" setp parport.0.reset-time 5000 loadrt stepgen step_type=0,0,0 ##1# loadrt or2 ##1# addf or2.0 servo-thread addf parport.0.read base-thread addf parport.1.read base-thread addf stepgen.make-pulses base-thread addf parport.0.write base-thread addf parport.0.reset base-thread addf parport.1.write base-thread addf stepgen.capture-position servo-thread addf motion-command-handler servo-thread addf motion-controller servo-thread addf stepgen.update-freq servo-thread net spindle-cmd-rpm     <= spindle.0.speed-out net spindle-cmd-rpm-abs <= spindle.0.speed-out-abs net spindle-cmd-rps     <= spindle.0.speed-out-rps net spindle-cmd-rps-abs <= spindle.0.speed-out-rps-abs net spindle-at-speed    => spindle.0.at-speed net spindle-cw <= spindle.0.forward net coolant-mist <= iocontrol.0.coolant-mist net coolant-flood <= iocontrol.0.coolant-flood net probe-in => motion.probe-input ##1# net probe-in motion.probe-input <= or2.0.out net xdir            => parport.0.pin-02-out net xstep           => parport.0.pin-03-out setp parport.0.pin-03-out-reset 1 setp parport.0.pin-04-out-invert 1 net ydir            => parport.0.pin-04-out net ystep           => parport.0.pin-05-out setp parport.0.pin-05-out-reset 1 setp parport.0.pin-06-out-invert 1 net zdir            => parport.0.pin-06-out net zstep           => parport.0.pin-07-out setp parport.0.pin-07-out-reset 1 net coolant-flood   => parport.1.pin-02-out net coolant-flood   => parport.1.pin-01-out net coolant-flood   => parport.0.pin-01-out ##net coolant-flood   => parport.1.pin-14-out ##net coolant-flood   => parport.1.pin-16-out ##net coolant-flood   => parport.1.pin-17-out net spindle-cw      => parport.1.pin-03-out net home-x          <= parport.0.pin-10-in net home-y          <= parport.0.pin-11-in-not net home-z          <= parport.0.pin-12-in-not ##1# net touchprobe-in or2.0.in0        <= parport.1.pin-10-in-not ##1# net toolprobe-in or2.0.in1        <= parport.1.pin-12-in-not ##2# net probe-in        <= parport.1.pin-12-in-not net probe-in        <= parport.1.pin-12-in-not net estop-ext       <= parport.1.pin-13-in-not setp stepgen.0.position-scale [JOINT_0]SCALE setp stepgen.0.steplen 1 setp stepgen.0.stepspace 0 setp stepgen.0.dirhold 70000 setp stepgen.0.dirsetup 70000 setp stepgen.0.maxaccel [JOINT_0]STEPGEN_MAXACCEL net xpos-cmd joint.0.motor-pos-cmd => stepgen.0.position-cmd net xpos-fb stepgen.0.position-fb => joint.0.motor-pos-fb net xstep <= stepgen.0.step net xdir <= stepgen.0.dir net xenable joint.0.amp-enable-out => stepgen.0.enable net home-x => joint.0.home-sw-in setp stepgen.1.position-scale [JOINT_1]SCALE setp stepgen.1.steplen 1 setp stepgen.1.stepspace 0 setp stepgen.1.dirhold 70000 setp stepgen.1.dirsetup 70000 setp stepgen.1.maxaccel [JOINT_1]STEPGEN_MAXACCEL net ypos-cmd joint.1.motor-pos-cmd => stepgen.1.position-cmd net ypos-fb stepgen.1.position-fb => joint.1.motor-pos-fb net ystep <= stepgen.1.step net ydir <= stepgen.1.dir net yenable joint.1.amp-enable-out => stepgen.1.enable net home-y => joint.1.home-sw-in setp stepgen.2.position-scale [JOINT_2]SCALE setp stepgen.2.steplen 1 setp stepgen.2.stepspace 0 setp stepgen.2.dirhold 70000 setp stepgen.2.dirsetup 70000 setp stepgen.2.maxaccel [JOINT_2]STEPGEN_MAXACCEL net zpos-cmd joint.2.motor-pos-cmd => stepgen.2.position-cmd net zpos-fb stepgen.2.position-fb => joint.2.motor-pos-fb net zstep <= stepgen.2.step net zdir <= stepgen.2.dir net zenable joint.2.amp-enable-out => stepgen.2.enable net home-z => joint.2.home-sw-in net estop-out <= iocontrol.0.user-enable-out net estop-ext => iocontrol.0.emc-enable-in loadusr -W hal_manualtoolchange net tool-change iocontrol.0.tool-change => hal_manualtoolchange.change net tool-changed iocontrol.0.tool-changed <= hal_manualtoolchange.changed net tool-number iocontrol.0.tool-prep-number => hal_manualtoolchange.number net tool-prepare-loopback iocontrol.0.tool-prepare => iocontrol.0.tool-prepared

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3 years 11 months ago #255928 by tommylight
Replied by tommylight on topic Parallel port control pins less than 1V(output)
Did you measure with or without load?
Usually on my cards, those pins require more current as inputs, as outputs i had no issues ever, except the voltage is always a bit lower than other 8 outputs, 3.1 to 3.2V for a 3.3V board, and 4.3 to 4.5V for a 5V board.

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3 years 11 months ago #255939 by TooTall18T
Replied by TooTall18T on topic Parallel port control pins less than 1V(output)
I measured it directly at the port, at the other end of the cable, with 10k pull down resistor, without the resistor and with and without the Schmit-Trigger. The voltage stays the same unless I restart the computer.

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3 years 11 months ago #256037 by andypugh
Replied by andypugh on topic Parallel port control pins less than 1V(output)
Try wiring them as sinking outputs. I suspect that you can safely pull them up to 5V (because it is meant to be a parallel port, after all) and you can generally rely on a parport to sink 15mA.
I wouldn't rely in that in this case, but a pull-up sized for sinking 5mA will probably work.

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3 years 11 months ago #256055 by TooTall18T
Replied by TooTall18T on topic Parallel port control pins less than 1V(output)
Thanks andypugh it works.

Because of the 3,3V output signals I am using 3,3V on the pc side of the board.
With a 680Ohm pull up resistor a current of approx 4mA flows through the pin of the parallel port. I can measure a voltage between 0,52V and 2,9V.
I also tested it with a 1k resistor. The current is approx 3mA and the voltage switches between 0,2V and 2,8V.
In my case the parallel port triggers a Schmitt-Trigger and the 0,2V and 2,8V are clean logic levels at 3,3V supply voltage.

In my case the 10k resistor that I used as pull down before is to large as a pull up and that is the reason why it didn't work when I tested it.

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