LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

Oxbown
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2 months 1 day ago #349154 by Oxbown

Replied by Oxbown on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

Hi Meister, I updated to the dev branch, but I don't see any difference. Is there any way to sniff the Modbus network?

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meister
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2 months 1 day ago #349155 by meister

Replied by meister on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

new dev update:

go to mbus plugin-config and set the new debug flag

hope that help's

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Oxbown
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2 months 23 hours ago #349156 by Oxbown

Replied by Oxbown on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

I ran a couple of tests, and the raw Modbus data makes sense. The board's response is OK, and the data corresponds to the DIs that are ON.
Seems that the mistake is in the LinuxCNC HAL config.

IN1
> MODBUS_TX(mbus0): 1 3 0 192 0 2 196 55
MODBUS_RXmbus0: 1 3 4 0 1 0 0 171 243

IN2
> MODBUS_TX(mbus0): 1 3 0 192 0 2 196 55
MODBUS_RXmbus0: 1 3 4 0 2 0 0 91 243

IN1 + IN2
>MODBUS_TX(mbus0): 1 3 0 192 0 2 196 55
MODBUS_RXmbus0: 1 3 4 0 3 0 0 10 51

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meister
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2 months 22 hours ago - 2 months 22 hours ago #349158 by meister

Replied by meister on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

i think the problem is, your device returns 4 bytes, not the requested 2 ?!?!

Code:

01 03 00 192 00 02 196 55
01: The SlaveID
   03: The Function Code 3 (read Analog Output Holding Registers)
      00 192: start register
             00 02: number of bytes

01 03 04 00 02 00 00 91 243
01: The SlaveID
   03: The Function Code 3 (read Analog Output Holding Registers)
      04: The number of data bytes to follow
         00: The contents of register 192
            02: The contents of register 193
               00: The contents of register 194
                  00: The contents of register 195


please try to change the 16 'values' to 32

you need to pull dev to incrase the values, with my simulation it works, but it's a workaround,
i will write a fix, to read the values in the right order and ignore the last 16bit's

Last edit: 2 months 22 hours ago by meister.

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meister
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2 months 21 hours ago #349159 by meister

Replied by meister on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

oh, no, my fault, i send number of bytes, not number of registers

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meister
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2 months 21 hours ago #349160 by meister

Replied by meister on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

I hope I’ve managed it now; it’s a bit tricky without the hardware

please set back to 16 values, update dev and try again

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