Preparation for the self-construction of a carousel changer

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30 Oct 2022 18:55 #255475 by andypugh
1kHz is more than can be done on the GPIO with software PWM, which was my first idea.

The 7i76E has a number of expansion ports. What (if anything) do you have plugged in to those? There may be one or more PWM channels available there.

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31 Oct 2022 01:25 #255532 by mgm
I haven't connected anything to the extension terminations if they mean the two 25 pin connectors.
I only have a 7i84D connected to RS -422.

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31 Oct 2022 12:32 #255564 by andypugh
If you start LinuxCNC from the command line (command "linuxcnc") then there should be a dump of all the pin functions printed to the terminal.
See if you have any extra PWM channels showing.

You can either connect directly to the pins (though it's a bit risky) to get a PWM, or attach any of these boards and take the PWM from them:
store.mesanet.com/index.php?route=product/category&path=83_87
Don't be too concerned about the intended use of the boards, a step-dir output can be used to output PWM if the pin assignments match. But the cheapest board (7i75) is purely buffering/protection and doesn't need a fortuitous match.

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31 Oct 2022 13:01 #255567 by mgm
Ok then the 7i78 would be the right one for me right?
That is even available at EUSurplas! Then I order the ....
Thanks for the support!

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31 Oct 2022 14:11 #255574 by andypugh
Or 7i75.

Which firmware do you currently have on the 7i76E?

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31 Oct 2022 15:11 #255579 by mgm
It is the firmware on it as delivered !

I can not look because I am today and tomorrow on vacation.

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02 Nov 2022 08:41 - 02 Nov 2022 08:43 #255761 by mgm
I have ordered a 7i75!

When starting linuxcnc via the terminal I get the following info:
 

File Attachment:

File Name: Pinbelegun...sion.txt
File Size:4 KB


but there is no PWM included ...
Do I have to flash another bit file and if so which one?
Attachments:
Last edit: 02 Nov 2022 08:43 by mgm.

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02 Nov 2022 13:17 #255784 by andypugh
I have been poking about in the hostmot2 firmware files for the 7i76E and found a firmware that swaps one of the step-dir channels on the 7i76E for a PWM / DIR channel.
Are you using all the stepgens?
It's the 7i76e_7i76x1p2d.bit file

What is your current "loadrt hm2_eth" line in the HAL file? It might be disabling PWM on the current firmware.

Do you have Mesaflash? (You are likely to need it soon)

sudo apt-get install mesaflash

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03 Nov 2022 08:05 #255822 by mgm
Yes I am using all 5 stepgens !

My current line is:
loadrt hm2_eth board_ip="10.10.10.10" config=" num_encoders=1 num_pwmgens=0 num_stepgens=5 sserial_port_0=20xxxx"

I think I need to change num_pwmgens=0   to   num_pwmgens=1   right?

Mesa flash I have already installed ...

Where can I find the new bit file?

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03 Nov 2022 08:25 #255824 by mgm
Ok I found the bit-fils on the Mesa site!

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