Raspberry Pi 4

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10 Jan 2020 00:07 #154510 by Gene1934
Replied by Gene1934 on topic Raspberry Pi 4
Can you described the issues? I'm seeing something myself that seems to disturb only the manual jog keydown continuity.

Thanks.

Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
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10 Jan 2020 00:38 #154512 by skunkworks
Replied by skunkworks on topic Raspberry Pi 4
2ms.. This video was before figuring out the time sync usage..

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13 Jan 2020 16:34 #154768 by skunkworks
Replied by skunkworks on topic Raspberry Pi 4
99% sure the problems I was having was timesyncd -> switched to ntp

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14 Jan 2020 18:40 #154837 by russell
Replied by russell on topic Raspberry Pi 4
Hi,
I'm in the process of moving my lathe over from MachineKit on a BBB to LinuxCNC on a RPI 4 with a Mesa 7c80, I've had to use master to get the INMUX support for the inputs but I'm now stuck setting up the spindle enables and direction outputs. I've got the motor drivers direction and enable inputs connected up to the Spindle Enable and Spindle Direction terminals on TB5 but I can't see anyway of triggering them from HAL - am I missing something?

Regards
Russlel

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14 Jan 2020 19:58 - 14 Jan 2020 20:14 #154840 by PCW
Replied by PCW on topic Raspberry Pi 4

russell wrote: Hi,
I'm in the process of moving my lathe over from MachineKit on a BBB to LinuxCNC on a RPI 4 with a Mesa 7c80, I've had to use master to get the INMUX support for the inputs but I'm now stuck setting up the spindle enables and direction outputs. I've got the motor drivers direction and enable inputs connected up to the Spindle Enable and Spindle Direction terminals on TB5 but I can't see anyway of triggering them from HAL - am I missing something?

Regards
Russlel


Yeah missing a better manual...

The spindle analog enable is part of the PWM hardware so enabled when
the PWMGen is enabled

The Optocoupler ENA (or forward) output is controlled by GPIO 20

The Optocoupler DIR (or reverse) output is controlled by GPIO 21

These are both active low so you would want to set both the is_output parameter
on both GPIO bits and set invert_output parameter on the enable pin
(and possibly on the dir pin depending on how the drive direction works)
Last edit: 14 Jan 2020 20:14 by PCW.

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17 Jan 2020 21:33 #155082 by AgentWD40
Replied by AgentWD40 on topic Raspberry Pi 4
Maybe this is the wrong place to ask this, if so I apologize in advance.

If one were setting up a new machine with rpi4 in mind, is there any performance benefit to the 7c80 vs something like the 7i96? There is obviously a significant cost difference.

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17 Jan 2020 21:53 #155083 by PCW
Replied by PCW on topic Raspberry Pi 4
No performance difference, the 7C80 does provide quite a bit more I/O

24 isolated inputs vs 11
8 isolated outputs vs 6
Isolated analog spindle interface vs no spindle interface
Single 10-36V power vs 5V power
Doesn't use RPI4s Ethernet
(this could be an advantage or disadvantage depending on physical layout)
The following user(s) said Thank You: AgentWD40, dvot

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18 Jan 2020 22:54 #155118 by Mike_Eitel
Replied by Mike_Eitel on topic Raspberry Pi 4
Hi PCW
Maybe I'm to blind, but i could not find the prices for the rpi cards on your pricelist..
Where can i find them.
THX
Mike

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18 Jan 2020 23:13 #155119 by AgentWD40

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19 Jan 2020 08:03 #155134 by Mike_Eitel
Replied by Mike_Eitel on topic Raspberry Pi 4
I downloaded the pricelist.

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