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[Solved] Mesa 7i96 Spindle PWM

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04 Jul 2025 12:01 - 06 Jul 2025 09:35 #331228 by dubstar_04
[Solved] Mesa 7i96 Spindle PWM was created by dubstar_04
I'm converting a lathe to run LinuxCNC, everything is working but the spindle.

I have flashed firmware: 7i96d_1pwm

Mesa flash output:
mesaflash --device 7i96 --addr 10.10.10.10 --readhmid

Configuration Name: HOSTMOT2

General configuration information:

  BoardName : MESA7I96
  FPGA Size: 9 KGates
  FPGA Pins: 144
  Number of IO Ports: 3
  Width of one I/O port: 17
  Clock Low frequency: 100.0000 MHz
  Clock High frequency: 200.0000 MHz
  IDROM Type: 3
  Instance Stride 0: 4
  Instance Stride 1: 64
  Register Stride 0: 256
  Register Stride 1: 256

Modules in configuration:

  Module: DPLL
  There are 1 of DPLL in configuration
  Version: 0
  Registers: 7
  BaseAddress: 7000
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: WatchDog
  There are 1 of WatchDog in configuration
  Version: 0
  Registers: 3
  BaseAddress: 0C00
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: IOPort
  There are 3 of IOPort in configuration
  Version: 0
  Registers: 5
  BaseAddress: 1000
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: PWM
  There are 1 of PWM in configuration
  Version: 0
  Registers: 5
  BaseAddress: 4100
  ClockFrequency: 200.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: StepGen
  There are 4 of StepGen in configuration
  Version: 2
  Registers: 10
  BaseAddress: 2000
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: QCount
  There are 1 of QCount in configuration
  Version: 2
  Registers: 5
  BaseAddress: 3000
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: SSerial
  There are 1 of SSerial in configuration
  Version: 0
  Registers: 6
  BaseAddress: 5B00
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 64 bytes

  Module: SSR
  There are 1 of SSR in configuration
  Version: 0
  Registers: 2
  BaseAddress: 7D00
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: LED
  There are 1 of LED in configuration
  Version: 0
  Registers: 1
  BaseAddress: 0200
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

Configuration pin-out:

IO Connections for TB3 -> 7I96_0
Pin#                  I/O   Pri. func    Sec. func        Chan     Sec. Pin func   Sec. Pin Dir

TB3-1                   0   IOPort       None           
TB3-2                   1   IOPort       None           
TB3-3                   2   IOPort       None           
TB3-4                   3   IOPort       None           
TB3-5                   4   IOPort       None           
TB3-6                   5   IOPort       None           
TB3-7                   6   IOPort       None           
TB3-8                   7   IOPort       None           
TB3-9                   8   IOPort       None           
TB3-10                  9   IOPort       None           
TB3-11                 10   IOPort       None           
TB3-13,14              11   IOPort       SSR              0        Out-00          (Out)
TB3-15,16              12   IOPort       SSR              0        Out-01          (Out)
TB3-17,18              13   IOPort       SSR              0        Out-02          (Out)
TB3-19,20              14   IOPort       SSR              0        Out-03          (Out)
TB3-21,22              15   IOPort       SSR              0        Out-04          (Out)
TB3-23,24              16   IOPort       SSR              0        Out-05          (Out)

IO Connections for TB1/TB2 -> 7I96_1
Pin#                  I/O   Pri. func    Sec. func        Chan     Sec. Pin func   Sec. Pin Dir

TB1-2,3                17   IOPort       StepGen          0        Step/Table1     (Out)
TB1-4,5                18   IOPort       StepGen          0        Dir/Table2      (Out)
TB1-8,9                19   IOPort       StepGen          1        Step/Table1     (Out)
TB1-10,11              20   IOPort       StepGen          1        Dir/Table2      (Out)
TB1-14,15              21   IOPort       StepGen          2        Step/Table1     (Out)
TB1-16,17              22   IOPort       StepGen          2        Dir/Table2      (Out)
TB1-20,21              23   IOPort       StepGen          3        Step/Table1     (Out)
TB1-22,23              24   IOPort       StepGen          3        Dir/Table2      (Out)
TB2-2,3                25   IOPort       PWM              0        PWM             (Out)
TB2-4,5                26   IOPort       PWM              0        Dir             (Out)
TB2-7,8                27   IOPort       QCount           0        Quad-A          (In)
TB2-10,11              28   IOPort       QCount           0        Quad-B          (In)
TB2-13,14              29   IOPort       QCount           0        Quad-IDX        (In)
TB2-16,17              30   IOPort       SSerial          0        RXData0         (In)
TB2-18,19              31   IOPort       SSerial          0        TXData0         (Out)
Internal-TXEn          32   IOPort       SSerial          0        TXEn0           (Out)
Internal               33   IOPort       SSR              0        AC Ref          (Out)

IO Connections for P1 -> 7I96_2
Pin#                  I/O   Pri. func    Sec. func        Chan     Sec. Pin func   Sec. Pin Dir

P1-01/DB25-01          34   IOPort       None           
P1-02/DB25-14          35   IOPort       None           
P1-03/DB25-02          36   IOPort       None           
P1-04/DB25-15          37   IOPort       None           
P1-05/DB25-03          38   IOPort       None           
P1-06/DB25-16          39   IOPort       None           
P1-07/DB25-04          40   IOPort       None           
P1-08/DB25-17          41   IOPort       None           
P1-09/DB25-05          42   IOPort       None           
P1-11/DB25-06          43   IOPort       None           
P1-13/DB25-07          44   IOPort       None           
P1-15/DB25-08          45   IOPort       None           
P1-17/DB25-09          46   IOPort       None           
P1-19/DB25-10          47   IOPort       None           
P1-21/DB25-11          48   IOPort       None           
P1-23/DB25-12          49   IOPort       None           
P1-25/DB25-13          50   IOPort       None          



Connections:
Pin TB2-1 -> GND
Pin TB2-3 > PWM+

I'm not getting anything out of pwm to analog boards. I have tried 5 different convertor boards with the same result. Before I invest in a scope or a new mesa board can anyone spot anything wrong with the config?

Thank you,
Dan
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Last edit: 06 Jul 2025 09:35 by dubstar_04.

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04 Jul 2025 16:16 #331249 by PCW
Replied by PCW on topic Mesa 7i96 Spindle PWM
When LinuxCNC is running and you have the spindle on and set to say 1/2 speed.
what does:

halcmd show all spin*

report?

Also, you can get an idea of PWM operation independent of any add-on cards
with just a voltmeter, as the voltmeter will read the average voltage which will
be proportional to the PWM duty cycle.

 
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04 Jul 2025 16:53 #331251 by dubstar_04
Replied by dubstar_04 on topic Mesa 7i96 Spindle PWM
Hi PCW,

Thank you for the quick response.

halcmd show all spin*
Loaded HAL Components:
ID      Type  Name                                            PID   State

Component Pins:
Owner   Type  Dir         Value  Name
    29  bit   IN          FALSE  spindle.0.amp-fault-in
    29  bit   IN           TRUE  spindle.0.at-speed <== spindle-at-speed
    29  bit   OUT         FALSE  spindle.0.brake ==> spindle-brake
    29  bit   OUT          TRUE  spindle.0.forward ==> spindle-cw
    29  bit   I/O         FALSE  spindle.0.index-enable <=> spindle-index-enable
    29  bit   IN          FALSE  spindle.0.inhibit
    29  bit   IN          FALSE  spindle.0.is-oriented
    29  bit   OUT         FALSE  spindle.0.locked
    29  bit   OUT          TRUE  spindle.0.on ==> spindle-enable
    29  bit   OUT         FALSE  spindle.0.orient
    29  float OUT             0  spindle.0.orient-angle
    29  s32   IN              0  spindle.0.orient-fault
    29  s32   OUT             0  spindle.0.orient-mode
    29  bit   OUT         FALSE  spindle.0.reverse ==> spindle-ccw
    29  float IN             -0  spindle.0.revs <== spindle-revs
    29  float OUT      29.16667  spindle.0.speed-cmd-rps
    29  float IN              0  spindle.0.speed-in <== spindle-vel-fb-rps
    29  float OUT          1750  spindle.0.speed-out ==> spindle-vel-cmd-rpm
    29  float OUT          1750  spindle.0.speed-out-abs ==> spindle-vel-cmd-rpm-abs
    29  float OUT      29.16667  spindle.0.speed-out-rps ==> spindle-vel-cmd-rps
    29  float OUT      29.16667  spindle.0.speed-out-rps-abs ==> spindle-vel-cmd-rps-abs

Pin Aliases:
 Alias                                            Original Name

Signals:
Type          Value  Name     (linked to)
bit            TRUE  spindle-at-speed
                         ==> gmoccapy.spindle_at_speed_led
                         ==> spindle.0.at-speed
bit           FALSE  spindle-brake
                         <== spindle.0.brake
bit           FALSE  spindle-ccw
                         <== spindle.0.reverse
bit            TRUE  spindle-cw
                         <== spindle.0.forward
bit            TRUE  spindle-enable
                         ==> hm2_7i96.0.pwmgen.00.enable
                         ==> hm2_7i96.0.ssr.00.out-05
                         ==> pid.s.enable
                         <== spindle.0.on
bit           FALSE  spindle-index-enable
                         <=> hm2_7i96.0.encoder.00.index-enable
                         ==> pid.s.index-enable
                         <=> spindle.0.index-enable
bit           FALSE  spindle-manual-ccw
                         ==> halui.spindle.0.reverse
bit           FALSE  spindle-manual-cw
                         ==> halui.spindle.0.forward
bit           FALSE  spindle-manual-stop
                         ==> halui.spindle.0.stop
float          1750  spindle-output
                         ==> hm2_7i96.0.pwmgen.00.value
                         <== pid.s.output
float            -0  spindle-revs
                         <== hm2_7i96.0.encoder.00.position
                         ==> spindle.0.revs
float          1750  spindle-vel-cmd-rpm
                         <== spindle.0.speed-out
float          1750  spindle-vel-cmd-rpm-abs
                         ==> pid.s.command
                         <== spindle.0.speed-out-abs
float      29.16667  spindle-vel-cmd-rps
                         <== spindle.0.speed-out-rps
float      29.16667  spindle-vel-cmd-rps-abs
                         <== spindle.0.speed-out-rps-abs
float             0  spindle-vel-fb-rpm
                         <== hm2_7i96.0.encoder.00.velocity-rpm
float             0  spindle-vel-fb-rpm-abs
                         ==> pid.s.feedback
float             0  spindle-vel-fb-rps
                         <== hm2_7i96.0.encoder.00.velocity
                         ==> spindle.0.speed-in

Parameters:
Owner   Type  Dir         Value  Name

Parameter Aliases:
 Alias                                            Original Name

Exported Functions:
Owner   CodeAddr  Arg       FP   Users  Name

Realtime Threads:
     Period  FP     Name               (     Time, Max-Time )

Measuring the pwm pin output shows 1.1v at 50% speed and 2.2v at 100%, 0 volt when the spindle is off.

Thank you,

Dan
 

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04 Jul 2025 17:06 #331252 by PCW
Replied by PCW on topic Mesa 7i96 Spindle PWM
If you set the PWM to 0 and invert the PWM output
do you get ~5V?

to invert:

halcmd setp hm2_7i96.0.pwmgen.00.out0.invert_output true



 
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04 Jul 2025 17:15 #331253 by dubstar_04
Replied by dubstar_04 on topic Mesa 7i96 Spindle PWM
With the output inverted the pwm output is 2.2v without the spindle running.

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04 Jul 2025 18:07 - 04 Jul 2025 18:14 #331254 by PCW
Replied by PCW on topic Mesa 7i96 Spindle PWM
Sounds like the output has been damaged...

You might check the step- output (TB2 pin 2)

(as a sanity check, STEP- should be at ~5V when STEP+ is 0)

 
Last edit: 04 Jul 2025 18:14 by PCW.
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04 Jul 2025 18:23 #331258 by dubstar_04
Replied by dubstar_04 on topic Mesa 7i96 Spindle PWM
There is no output at all on TB2-2.

Is it possible to move the PWM to one of the other stepgens? eg. TB1-20/21?

Thanks,

Dan

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04 Jul 2025 19:44 #331262 by PCW
Replied by PCW on topic Mesa 7i96 Spindle PWM
 

File Attachment:

File Name: 7i96s_2pwm...7-04.zip
File Size:248 KB


7I96 bitfile with 2 PWMGens

Looks like the 74ACT04 (U17) was damaged
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04 Jul 2025 19:51 #331264 by dubstar_04
Replied by dubstar_04 on topic Mesa 7i96 Spindle PWM
Amazing! Thank you! 

I don't know the history of the board. Bought it cheap on eBay many years ago. It would be great if I can manage to use it, if not a 7I96S would probably suit my needs better.

Thanks again,

Dan

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05 Jul 2025 08:00 #331303 by dubstar_04
Replied by dubstar_04 on topic Mesa 7i96 Spindle PWM
Hi Peter,

Is the file you uploaded correct? It is listed as 7I96S and I can't seem to find a .bit file.

Thanks,

Dan

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