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TMS570 - stepper motor driver indexer

Markus Merklinger
Prodigy 10 points
Other Parts Discussed in Thread: DRV8825

Hi all,

I want to apply acceleration/deceleration profiles to a bipolar stepper motor using the drv8825 driver (Control Interface: Indexer).

The HET IDE Algorithm Library includes a frequency modulated output example. I’m not familiar with HET IDE, how can I dynamically generate a frequency modulated output signal using HET from a task, is there an example available? Is this the best way to get an acceleration/deceleration profile?


Thanks in advance

  • 0
    TI__Mastermind 22715 points

    Markus,

    I assume that you want to change the period of the drive pulse so that the step motor can be run at different speed. In order to change the period of the pulses generated by the HET module, you will need to change the counting period value in the HET RAM for the CNT instruction. If you want to change the period of every pulse, the best way is to use HTU to move data from system RAM to HET RAM. HTU transfer can be triggered after the completion of each pulse. I would suggest you to spend some time on the userguide for HET and HTU. Then we can help you to work out details.

    Thanks and regards,

    Zhaohong