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DRV8846: DRV8846

John Collins94
Prodigy 160 points
Part Number: DRV8846

I connected a stepper motor and applied the control signals as below, The output at the stepper motor is measured constant as 1001. Is there any input parameter I am missing or wrong?

I1=0
I1=0
ADec=0
M0=0
M1=0
Dec0=0
Dec1=0

ENABLE=1
SLEEP=0
DIRCTION=0

loop
{
STEP=1
Delay
STEP=0
Delay
}

DIRCTION=1

loop
{
STEP=1
Delay
STEP=0
Delay
}

  • 0
    TI__Genius 14487 points
    Hi John,

    You show "SLEEP = 0." To enable the device, nSLEEP pin must be 1. I'm assuming you have the correct signal in hardware since the motor is turning, but I wanted to double check with you on this.

    Now back to your issue - you said that the motor moves at a constant speed. From your code, it looks like you want it turn one direction then reverse direction. Is your issue that this direction change is not happening?

    If so, your MCU code might be getting stuck in your first loop. Also, check the DIR pin with a scope. If your software works correctly, you should see the DIR pin toggling on the scope.
  • 0 in reply to James Lockridge19
    Prodigy 160 points
    When I set nSLEEP to 1 it works. (Earlier the stepper output was measured as the logic 1001; stepper was not moving)