External stepper step pulse width

Hi,

I am using a tinyg to drive external stepper drivers that have a required minimum pulse width of 2.5 uS. Motor 1,2 and 3 (mapped to x,y and z) all work fine, motor 4 (mapped to A) does not seem to drive the stepper. i am converting the 3.3v tinyg outputs to low impedance 5v since the steppers have opto isolated inputs that need 5 ma at 5v.

When I scope the tinyg outputs, 1,2 and 3 all have a pulse width of about 2.6 uS but 4 has a pulse that is only about 1.6 uS wide. Any thoughts on why/what i can do to increase the width by configuration or do I need to add some pulse stretching to the level conversion.

tinyg configuration below.

Thanks
Doug

[fb] firmware build 440.20
[fv] firmware version 0.97
[hp] hardware platform 1.00
[hv] hardware version 8.00
[id] TinyG ID 5W3249-PJM
[ja] junction acceleration 100000 mm
[ct] chordal tolerance 0.0100 mm
[sl] soft limit enable 0
[st] switch type 1 [0=NO,1=NC]
[mt] motor idle timeout 2.00 Sec
[ej] enable json mode 0 [0=text,1=JSON]
[jv] json verbosity 2 [0=silent,1=footer,2=messages,3=configs,4=l]
[js] json serialize style 1 [0=relaxed,1=strict]
[tv] text verbosity 1 [0=silent,1=verbose]
[qv] queue report verbosity 1 [0=off,1=single,2=triple]
[sv] status report verbosity 1 [0=off,1=filtered,2=verbose]
[si] status interval 250 ms
[ec] expand LF to CRLF on TX 0 [0=off,1=on]
[ee] enable echo 0 [0=off,1=on]
[ex] enable flow control 2 [0=off,1=XON/XOFF, 2=RTS/CTS]
[baud] USB baud rate 5 [1=9600,2=19200,3=38400,4=57600,5=115200,6=]
[net] network mode 0 [0=master]
[gpl] default gcode plane 0 [0=G17,1=G18,2=G19]
[gun] default gcode units mode 1 [0=G20,1=G21]
[gco] default gcode coord system 1 [1-6 (G54-G59)]
[gpa] default gcode path control 2 [0=G61,1=G61.1,2=G64]
[gdi] default gcode distance mode 0 [0=G90,1=G91]
[1ma] m1 map to axis 0 [0=X,1=Y,2=Z…]
[1sa] m1 step angle 1.800 deg
[1tr] m1 travel per revolution 5.0000 mm
[1mi] m1 microsteps 2 [1,2,4,8]
[1po] m1 polarity 1 [0=normal,1=reverse]
[1pm] m1 power management 2 [0=disabled,1=always on,2=in cycle,3=when m]
[2ma] m2 map to axis 1 [0=X,1=Y,2=Z…]
[2sa] m2 step angle 1.800 deg
[2tr] m2 travel per revolution 5.0000 mm
[2mi] m2 microsteps 2 [1,2,4,8]
[2po] m2 polarity 1 [0=normal,1=reverse]
[2pm] m2 power management 2 [0=disabled,1=always on,2=in cycle,3=when m]
[3ma] m3 map to axis 2 [0=X,1=Y,2=Z…]
[3sa] m3 step angle 1.800 deg
[3tr] m3 travel per revolution 4.0000 mm
[3mi] m3 microsteps 2 [1,2,4,8]
[3po] m3 polarity 1 [0=normal,1=reverse]
[3pm] m3 power management 2 [0=disabled,1=always on,2=in cycle,3=when m]
[4ma] m4 map to axis 3 [0=X,1=Y,2=Z…]
[4sa] m4 step angle 1.800 deg
[4tr] m4 travel per revolution 5.0000 mm
[4mi] m4 microsteps 2 [1,2,4,8]
[4po] m4 polarity 1 [0=normal,1=reverse]
[4pm] m4 power management 2 [0=disabled,1=always on,2=in cycle,3=when m]
[xam] x axis mode 1 [standard]
[xvm] x velocity maximum 6000 mm/min
[xfr] x feedrate maximum 6000 mm/min
[xtn] x travel minimum 0.000 mm
[xtm] x travel maximum 575.000 mm
[xjm] x jerk maximum 35 mm/min^3 * 1 million
[xjh] x jerk homing 40 mm/min^3 * 1 million
[xjd] x junction deviation 0.0500 mm (larger is faster)
[xsn] x switch min 1 [0=off,1=homing,2=limit,3=limit+homing]
[xsx] x switch max 0 [0=off,1=homing,2=limit,3=limit+homing]
[xsv] x search velocity 500 mm/min
[xlv] x latch velocity 100 mm/min
[xlb] x latch backoff 5.000 mm
[xzb] x zero backoff 1.000 mm
[yam] y axis mode 1 [standard]
[yvm] y velocity maximum 7000 mm/min
[yfr] y feedrate maximum 7000 mm/min
[ytn] y travel minimum 0.000 mm
[ytm] y travel maximum 360.000 mm
[yjm] y jerk maximum 45 mm/min^3 * 1 million
[yjh] y jerk homing 40 mm/min^3 * 1 million
[yjd] y junction deviation 0.0500 mm (larger is faster)
[ysn] y switch min 1 [0=off,1=homing,2=limit,3=limit+homing]
[ysx] y switch max 0 [0=off,1=homing,2=limit,3=limit+homing]
[ysv] y search velocity 500 mm/min
[ylv] y latch velocity 100 mm/min
[ylb] y latch backoff 5.000 mm
[yzb] y zero backoff 1.000 mm
[zam] z axis mode 1 [standard]
[zvm] z velocity maximum 5000 mm/min
[zfr] z feedrate maximum 5000 mm/min
[ztn] z travel minimum -120.000 mm
[ztm] z travel maximum 0.000 mm
[zjm] z jerk maximum 40 mm/min^3 * 1 million
[zjh] z jerk homing 40 mm/min^3 * 1 million
[zjd] z junction deviation 0.0500 mm (larger is faster)
[zsn] z switch min 0 [0=off,1=homing,2=limit,3=limit+homing]
[zsx] z switch max 1 [0=off,1=homing,2=limit,3=limit+homing]
[zsv] z search velocity 400 mm/min
[zlv] z latch velocity 100 mm/min
[zlb] z latch backoff 5.000 mm
[zzb] z zero backoff 1.000 mm
[aam] a axis mode 1 [standard]
[avm] a velocity maximum 3000 deg/min
[afr] a feedrate maximum 3000 deg/min
[atn] a travel minimum 0.000 deg
[atm] a travel maximum 500.000 deg
[ajm] a jerk maximum 40 deg/min^3 * 1 million
[ajh] a jerk homing 40 deg/min^3 * 1 million
[ajd] a junction deviation 0.0500 deg (larger is faster)
[ara] a radius value 0.1989 deg
[asn] a switch min 1 [0=off,1=homing,2=limit,3=limit+homing]
[asx] a switch max 0 [0=off,1=homing,2=limit,3=limit+homing]
[asv] a search velocity 600 deg/min
[alv] a latch velocity 100 deg/min
[alb] a latch backoff 5.000 deg
[azb] a zero backoff 2.000 deg
[bam] b axis mode 0 [disabled]
[bvm] b velocity maximum 3600 deg/min
[bfr] b feedrate maximum 3600 deg/min
[btn] b travel minimum -1.000 deg
[btm] b travel maximum -1.000 deg
[bjm] b jerk maximum 20 deg/min^3 * 1 million
[bjd] b junction deviation 0.0500 deg (larger is faster)
[bra] b radius value 1.0000 deg
[cam] c axis mode 0 [disabled]
[cvm] c velocity maximum 3600 deg/min
[cfr] c feedrate maximum 3600 deg/min
[ctn] c travel minimum -1.000 deg
[ctm] c travel maximum -1.000 deg
[cjm] c jerk maximum 20 deg/min^3 * 1 million
[cjd] c junction deviation 0.0500 deg (larger is faster)
[cra] c radius value 1.0000 deg
[p1frq] pwm frequency 2500 Hz
[p1csl] pwm cw speed lo 1000 RPM
[p1csh] pwm cw speed hi 2000 RPM
[p1cpl] pwm cw phase lo 0.010 [0..1]
[p1cph] pwm cw phase hi 0.990 [0..1]
[p1wsl] pwm ccw speed lo 1000 RPM
[p1wsh] pwm ccw speed hi 2000 RPM
[p1wpl] pwm ccw phase lo 0.010 [0..1]
[p1wph] pwm ccw phase hi 0.990 [0..1]
[p1pof] pwm phase off 0.000 [0..1]