AVNET SmartEdge IIOT Gateway: Control Industrial I/O directly from GPIO Pins

RE: AVNET SmartEdge IIOT Gateway: Control Industrial I/O directly from GPIO Pins

ajcc — Fri, 15 Jan 2021 18:22:20 GMT

The sysfs interface /sys/class/gpio is going to go away soon, since Linux 4.8 it's not enabled by default and it will eventually be completely removed. They've switched to a character device based interface instead that can be used through the linux/gpio.h API, there's also the libgpiod library that makes using it a lot easier. With the new way of doing it GPIO pin 21 on the schematic is GPIO pin 21 in the kernel too, plus you can read and write many pins at once.

RE: AVNET SmartEdge IIOT Gateway: Control Industrial I/O directly from GPIO Pins

Jan Cumps — Sun, 10 Jan 2021 21:35:31 GMT

The natural next step is to try OpenPLC. I tried it on a Pi: Try out OpenPLC on a Raspberry Pi.

The combination of a SmartEdge with its industry compiant IO and PLC software can be great asset...

hang on.

RE: AVNET SmartEdge IIOT Gateway: Control Industrial I/O directly from GPIO Pins

Jan Cumps — Sun, 10 Jan 2021 17:03:42 GMT

Obviously, there are pros and cons.

Pro:

for Pi users and software, the industrial I/Os look like any Raspberry Pi GPIO
Specific software like WiringPi and OpenPLC can run out of box.

Con:

modification of the PCB
I bet the certifications will be void
8 GPIO pins are now used, while the original design uses none.

RE: AVNET SmartEdge IIOT Gateway: Control Industrial I/O directly from GPIO Pins

Jan Cumps — Sat, 09 Jan 2021 21:45:16 GMT

I think that's the lost resistor:

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RE: AVNET SmartEdge IIOT Gateway: Control Industrial I/O directly from GPIO Pins

DAB — Sat, 09 Jan 2021 18:59:50 GMT

Good post Jan.

DAB