Tiny g maximum pulse rate

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  • September 27, 2016 at 11:38 pm #9925
    Adamj12b
    Member

    Hello everyone,

    I’m looking at using a tiny g for an upcoming project but I need to know what the maximum pulse frequency the controller can do. I will be driving ac servo drives with step and direction signals and to take full advantage of them, I will need to pulse them up to 256khz.

    Thank you for any information you can provide.

    -Adam

    September 28, 2016 at 6:25 am #9926
    cmcgrath5035
    Moderator

    tinyG is not appropriate for Servo Motors – there is no accommodation in hardware or FW for the position feedback

    September 28, 2016 at 7:03 am #9927
    Adamj12b
    Member

    Hello cmcgrath5035,

    I am not looking for closed loop control. The ac servos I am using have their own controllers that are just looking for step and direction signals. The issue is they are very high revolution and thus require a very fast pulse rate to achieve high speeds. The machine currently needs 20940 steps to move 1 inch. In order to achieve the 900ipm, the current FPGA interface has a 317khz pulse rate. I am looking to convert the machine to a tiny g in order to use some software that only interfaces to a tiny g. I’m sure it will be slower, but I am trying to figure out a rough speed it will be capable of.

    -Adam

    September 28, 2016 at 8:57 pm #9928
    cmcgrath5035
    Moderator

    I have seen, but cannot dig out of the past, a description of stepper pulse rates for tinyG. It is not a topic important to most “standard” (what ever that is) users.
    You might post an query here:

    My recollection is that it is limited by CPU resources, which would imply that tinyG2 (running on DUE) would be faster than tiny G, but in both cases (tinyG, G2) I don’t believe the pulse rate is user tweakable (easily, at least)
    HTH

    September 30, 2016 at 12:10 pm #9929
    Adamj12b
    Member

    I have found an answer to my own question after digging threw the source.

    The G1 (TinyG) firmware is capable of a maximum 50khz step output.

    The G2 firmware is capable of at least 200khz and I have seen comments in the source that looks like it could be pushed all the way to 400khz.

    -Adam

    October 2, 2016 at 8:33 am #9935
    cmcgrath5035
    Moderator

    If you search around a bit you will see folks recompiling G2 for higher performance Atmel devices, which might help in your quest for speed.

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