7i76: pwm output stuck high

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11 Apr 2020 09:34 - 11 Apr 2020 12:13 #163591 by johnbl
Hi,

I have a 7i96+7i76 combo, and have a PWM fan connected to one the StepGen (converted to PWM) outputs on the 7i76.

I use the following to control the fan in LinuxCNC:
net case_fan_ena => hm2_7i96.0.pwmgen.02.enable
net case_fan_pwm => hm2_7i96.0.pwmgen.02.value
setp hm2_7i96.0.pwmgen.02.output-type 1
setp hm2_7i96.0.pwmgen.02.scale 100
sets case_fan_pwm 30
sets case_fan_ena 1

When the boards are powered on, the pwm output is off as expected.
However when I quit LinuxCNC, or make a mistake in my config and LCNC fails to start, the pwm output is stuck high, and the fan spins like crazy. Is this expected?
Last edit: 11 Apr 2020 12:13 by johnbl.

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11 Apr 2020 13:51 #163613 by bbsr_5a
Replied by bbsr_5a on topic 7i76: pwm output stuck high
you can use a shutdown file to get all set off
if you use a coustom M-code to do pwm its also set to off during a e-stop

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11 Apr 2020 14:30 #163617 by PCW
Replied by PCW on topic 7i76: pwm output stuck high
The 7I96 step/dir outputs default to high when un-driven so you might try using the inverted
output (the StepN- pin) and inverting the PWM polarity:

setp hm2_7i96.0.pwmgen.02.out0.invert_output true

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11 Apr 2020 16:23 #163632 by johnbl
Replied by johnbl on topic 7i76: pwm output stuck high
Actually after more testing, what I initially wrote is not completely correct.

The PWM fan is connected on a STEP- pin, and as PCW suggested with invert_output = true.
When LinuxCNC exits, the STEP- pin is low.

However, when launching LinuxCNC and a driver fails to load (I'm developing a rt driver so it happens often...), the STEP- pin become stuck high. It's very annoying...
Any ideas?

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11 Apr 2020 16:26 #163633 by PCW
Replied by PCW on topic 7i76: pwm output stuck high
Is the watchdog enabled?

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11 Apr 2020 16:30 - 11 Apr 2020 16:34 #163634 by johnbl
Replied by johnbl on topic 7i76: pwm output stuck high
I think so. I have
setp hm2_7i96.0.watchdog.timeout_ns  10000000

This is the kind of log I get when it happens, suggesting that the mesa board is properly reset, but somehow isn't.
atv_vfd: rtapi_app_main: Operation now in progress (-115)
./gm1.hal:19: waitpid failed /home/cnc/src/linuxcnc/bin/rtapi_app atv_vfd
./gm1.hal:19: /home/cnc/src/linuxcnc/bin/rtapi_app exited without becoming ready
./gm1.hal:19: insmod for atv_vfd failed, returned -1
Shutting down and cleaning up LinuxCNC...
hm2_eth: HostMot2 ethernet driver unloaded
hm2: unloading
Last edit: 11 Apr 2020 16:34 by johnbl.

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11 Apr 2020 16:39 #163635 by PCW
Replied by PCW on topic 7i76: pwm output stuck high
If the watchdog bit it should have set the step- pins low
Does the red " /INIT" LED light up when LinuxCNC fails to load?
What firmware are you using?

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11 Apr 2020 16:50 #163638 by johnbl
Replied by johnbl on topic 7i76: pwm output stuck high
No red led, no.

Is this what you need about the firmware?
hm2: loading Mesa HostMot2 driver version 0.15
hm2_eth: loading Mesa AnyIO HostMot2 ethernet driver version 0.2
hm2_eth: 10.10.10.10: Hardware address: 00:60:1b:16:00:3a
hm2_eth: discovered 7I96
hm2/hm2_7i96.0: Low Level init 0.15
hm2/hm2_7i96.0: Smart Serial Firmware Version 43
Board hm2_7i96.0.7i76.0.0 Hardware Mode 0 = standard
Board hm2_7i96.0.7i76.0.0 Software Mode 0 = io_spin
Board hm2_7i96.0.7i76.0.0 Software Mode 1 = io_ana_spin
Board hm2_7i96.0.7i76.0.0 Software Mode 2 = io_enc_ana_spin_fv
hm2/hm2_7i96.0: created PktUART interface function hm2_7i96.0.pktuart.0
hm2/hm2_7i96.0: 51 I/O Pins used:
hm2/hm2_7i96.0:     IO Pin 000 (TB3-01): IOPort
hm2/hm2_7i96.0:     IO Pin 001 (TB3-02): IOPort
hm2/hm2_7i96.0:     IO Pin 002 (TB3-03): IOPort
hm2/hm2_7i96.0:     IO Pin 003 (TB3-04): IOPort
hm2/hm2_7i96.0:     IO Pin 004 (TB3-05): IOPort
hm2/hm2_7i96.0:     IO Pin 005 (TB3-06): IOPort
hm2/hm2_7i96.0:     IO Pin 006 (TB3-07): IOPort
hm2/hm2_7i96.0:     IO Pin 007 (TB3-08): IOPort
hm2/hm2_7i96.0:     IO Pin 008 (TB3-09): IOPort
hm2/hm2_7i96.0:     IO Pin 009 (TB3-10): IOPort
hm2/hm2_7i96.0:     IO Pin 010 (TB3-11): IOPort
hm2/hm2_7i96.0:     IO Pin 011 (TB3-13/TB3-14): SSR #0, pin Out-00 (Output)
hm2/hm2_7i96.0:     IO Pin 012 (TB3-15/TB3-16): SSR #0, pin Out-01 (Output)
hm2/hm2_7i96.0:     IO Pin 013 (TB3-17/TB3-18): SSR #0, pin Out-02 (Output)
hm2/hm2_7i96.0:     IO Pin 014 (TB3-19/TB3-20): SSR #0, pin Out-03 (Output)
hm2/hm2_7i96.0:     IO Pin 015 (TB3-21/TB3-22): SSR #0, pin Out-04 (Output)
hm2/hm2_7i96.0:     IO Pin 016 (TB3-23/TB3-24): SSR #0, pin Out-05 (Output)
hm2/hm2_7i96.0:     IO Pin 017 (TB1-02/TB1-03): StepGen #0, pin Step (Output)
hm2/hm2_7i96.0:     IO Pin 018 (TB1-04/TB1-05): StepGen #0, pin Direction (Output)
hm2/hm2_7i96.0:     IO Pin 019 (TB1-08/TB1-09): StepGen #1, pin Step (Output)
hm2/hm2_7i96.0:     IO Pin 020 (TB1-10/TB1-11): StepGen #1, pin Direction (Output)
hm2/hm2_7i96.0:     IO Pin 021 (TB1-14/TB1-15): StepGen #2, pin Step (Output)
hm2/hm2_7i96.0:     IO Pin 022 (TB1-16/TB1-17): StepGen #2, pin Direction (Output)
hm2/hm2_7i96.0:     IO Pin 023 (TB1-20/TB1-21): StepGen #3, pin Step (Output)
hm2/hm2_7i96.0:     IO Pin 024 (TB1-22-TB1-23): StepGen #3, pin Direction (Output)
hm2/hm2_7i96.0:     IO Pin 025 (TB2-01/TB2-03): PWMGen #0, pin Out0 (PWM or Up) (Output)
hm2/hm2_7i96.0:     IO Pin 026 (TB2-04/TB2-05): PWMGen #0, pin Out1 (Dir or Down) (Output)
hm2/hm2_7i96.0:     IO Pin 027 (TB2-07/TB2-08): Encoder #0, pin A (Input)
hm2/hm2_7i96.0:     IO Pin 028 (TB2-10/TB2-11): Encoder #0, pin B (Input)
hm2/hm2_7i96.0:     IO Pin 029 (TB2-13/TB2-14): Encoder #0, pin Index (Input)
hm2/hm2_7i96.0:     IO Pin 030 (TB2-16/TB2-17): PktUART Receive Channel #0, pin RX Data (Input)
hm2/hm2_7i96.0:     IO Pin 031 (TB2-18/TB2-19): PktUART Transmit Channel #0, pin TX Data (Output)
hm2/hm2_7i96.0:     IO Pin 032 (internal): PktUART Transmit Channel #0, pin Drv Enable (Output)
hm2/hm2_7i96.0:     IO Pin 033 (internal): SSR #0, pin AC Ref (Output)
hm2/hm2_7i96.0:     IO Pin 034 (P1-01): PWMGen #1, pin Out1 (Dir or Down) (Output)
hm2/hm2_7i96.0:     IO Pin 035 (P1-02): PWMGen #1, pin Out0 (PWM or Up) (Output)
hm2/hm2_7i96.0:     IO Pin 036 (P1-03): StepGen #4, pin Direction (Output)
hm2/hm2_7i96.0:     IO Pin 037 (P1-04): StepGen #4, pin Step (Output)
hm2/hm2_7i96.0:     IO Pin 038 (P1-05): StepGen #5, pin Direction (Output)
hm2/hm2_7i96.0:     IO Pin 039 (P1-06): StepGen #5, pin Step (Output)
hm2/hm2_7i96.0:     IO Pin 040 (P1-07): PWMGen #2, pin Out1 (Dir or Down) (Output)
hm2/hm2_7i96.0:     IO Pin 041 (P1-08): PWMGen #2, pin Out0 (PWM or Up) (Output)
hm2/hm2_7i96.0:     IO Pin 042 (P1-09): StepGen #6, pin Direction (Output)
hm2/hm2_7i96.0:     IO Pin 043 (P1-11): StepGen #6, pin Step (Output)
hm2/hm2_7i96.0:     IO Pin 044 (P1-13): Smart Serial Interface #0, pin tx0 (Output)
hm2/hm2_7i96.0:     IO Pin 045 (P1-15): Smart Serial Interface #0, pin rx0 (Input)
hm2/hm2_7i96.0:     IO Pin 046 (P1-17): IOPort
hm2/hm2_7i96.0:     IO Pin 047 (P1-19): IOPort
hm2/hm2_7i96.0:     IO Pin 048 (P1-21): Encoder #1, pin Index (Input)
hm2/hm2_7i96.0:     IO Pin 049 (P1-23): Encoder #1, pin B (Input)
hm2/hm2_7i96.0:     IO Pin 050 (P1-25): Encoder #1, pin A (Input)
hm2/hm2_7i96.0: registered

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11 Apr 2020 16:57 #163639 by johnbl
Replied by johnbl on topic 7i76: pwm output stuck high
However when LCNC exits properly the red LED lights up.

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11 Apr 2020 17:01 #163640 by PCW
Replied by PCW on topic 7i76: pwm output stuck high
Right so it looks like there's a window in the start-up where the watchdog has not been enabled yet (because a number of time consuming non RT setup tasks need to be done)
but a failed module load can cause an exit.

I will take a look at the driver to see if there's a way to mitigate this
The following user(s) said Thank You: johnbl

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