M4 does produce a PWM signal in Linuxcnc Debian Stretch
31 Aug 2020 01:47 - 31 Aug 2020 02:14 #180126
by Barry
M4 does produce a PWM signal in Linuxcnc Debian Stretch was created by Barry
I am using Debian Stretch LinuxCNC. The M3 command produces a Spindle PWM signal but the M4 command does not. Does anyone know how to resolve this problem?
Channel 14 was selected for the Spindle-PWM signal.
The Hal-Scope shows a square wave on Channel 14 when using the M3 command but when using the M4 command, the Hal-Scope shows no output on channel 14.
The MIDI test commands used were M3 S1000 and then M4 S1000. The M3 command controls spindle speed perfectly.
I just fixed this issue as follows:
The solution was to use pwmgen type 1 by editing the HAL file to say,
loadrt pwmgen output_type=1
Then it worked!
This would be a good upgrade to add into the Linuxcnc Step Conf.
Thank you,
Barry
Channel 14 was selected for the Spindle-PWM signal.
The Hal-Scope shows a square wave on Channel 14 when using the M3 command but when using the M4 command, the Hal-Scope shows no output on channel 14.
The MIDI test commands used were M3 S1000 and then M4 S1000. The M3 command controls spindle speed perfectly.
I just fixed this issue as follows:
The solution was to use pwmgen type 1 by editing the HAL file to say,
loadrt pwmgen output_type=1
Then it worked!
This would be a good upgrade to add into the Linuxcnc Step Conf.
Thank you,
Barry
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