On Mon, 22 Sep 2008, Sebastian Kuzminsky wrote:
> Date: Mon, 22 Sep 2008 09:52:09 -0600
> From: Sebastian Kuzminsky <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] stepgen & pwmgen fixes
>
> Eric H. Johnson wrote:
>> I realize that a voltmeter may not be a reliable means of measuring a PWM,
>> but my particular voltmeter does seem to agree with the power output of the
>> laser. It also agrees with the voltages I read when using the standard m5i20
>> driver, which is already known to produce good values.
>>
>> Thus, given the consistency and linearity of the readings, I am fairly
>> confident that they reasonably reflect what is going on with the PWM output.
>
> Peter, do you have any input on this? I think an oscilloscope trace of
> the PWM pin being driven by the hostmot2 driver is needed to move
> forward on this issue.
>
SVST8_4.BIT (2/01/08)
MD5 (SVST8_4.BIT) = dcf2cabf2a4b3fc08d8b783bbaaddeab
Heres my little test batch file:
wpo 1100 00fc0fc0 ; enable outputs
wpo 1200 00fc0fc0 ; select alternate sources
wpo 4200 ffff ; PWM rate max
wpo 4400 ffff : turn on enables
wpo 4100 20 ; 9 bit pwm mode
wpo 4000 01000000 ; 1/2 way up = 256
pause
ok = 50% duty cycle at 195.31 KHz
wpo 4100 21 ; 10 bit PWM mode
wpo 4000 02000000 ; 1/2 way up = 512
pause
ok = 50% duty cycle at 97.66 KHz
wpo 4100 22 ; 11 bit PWM mode
wpo 4000 04000000 ; 1/2 way up = 1024
pause
ok = 50% duty cycle at 48.83 Khz
wpo 4100 23 ; 12 bit PWM mode
wpo 4000 08000000 ; 1/2 way up = 2048
pause
ok = 50% duty cycle at 24.41 Khz
All looks to be OK
Peter Wallace
Mesa Electronics
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