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drv8824 problem with first move after power cycle

Edward Temple
Prodigy 10 points
Other Parts Discussed in Thread: DRV8824

I am using the drv8824 connected to the tms32f28069 using encoder pulses to provide feedback from the motor.  It appears to behave perfectly, except for one occasional anomaly.  After a power cycle,  The requested steps don't seem to match the feedback from the encoder pulses. I know the step index gets reset, but the position of the motor probably doesn't change.  Is there a common startup technique to take care of this condition?

Thanks in advance.

  • 0
    TI__Mastermind 21320 points

    Hi Edward,

    When the indexer is reset and re-enabled the motor driver is going to start again from the home state (45*). An example: If you stopped the driver mid-pattern and then restarted, it would pull the rotor forward or backwards to the home state depending on where the rotor left off. The driver would not know that it missed these steps but the encoder should be able to see this.