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TMS320F28069M: On a function in lab11e in F28069M

user6024771
Prodigy 220 points
Part Number: TMS320F28069M
gHall_State_delta = gHall_PwmIndex[gHall_State] - gHall_PwmIndex[gHall_PrevState];
  if((gHall_State_delta == -1) || (gHall_State_delta == 5))
  {
   gHall_dir = 1;   // positive direction
  }
     else if((gHall_State_delta == 1) || (gHall_State_delta == -5))
  {
   gHall_dir = 2;   // negative direction
   gHall_speed_fdb_pu = -gHall_speed_fdb_pu;
  }
  else
  {
   gHall_dir = 0;   // direction change
  }
How did you get it in this paragraph (gHall_State_delta =-1) / (gHall_State_delta = 5),-1 and 5?
More urgent, know the great god please tell me, thank you!
  • 0
    TI__Guru** 114200 points

    As you can see the code in HALLBLDC_State_Check(), read the state of the GPIOs of the hall signal, and get the current and previous commutation state of PWM according to the index array of the PWM state, and then calculate the difference value of the current and previous state. The PWM index array is defined by the hall signals and the connection of the motor.

  • 0 in reply to Yanming Luo
    Prodigy 220 points

    Thank you for your answer!

    According to this program, can the motor reverse be realized? How to achieve it?

    If the reference value of the velocity is changed to a negative value, the overcurrent occurs, but the positive rotation is normal.

  • 0 in reply to user6024771
    TI__Guru** 114200 points

    As replied to you, you only need to set the positive/negative value to the reference speed for clockwise and anti-clockwise rotation without any change if the clockwise rotation is fine.