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TMDSCNCD28069MISO: eQEP index event latch problem

Yiu Hang Li
Intellectual 460 points
Part Number: TMDSCNCD28069MISO
Other Parts Discussed in Thread: CONTROLSUITE

Hi there,

I am running the demo project PM_Sensorless for DRV830x-HC-C2-KIT_v105 in controlSUITE. I am testing the motor's encoder and it is connected to the MCU's eQEP module. It has some wired response regarding index event latch.

Every time when passing index position:
1. QPOSILAT will be different, and it is not either 0 non QPOSMAX
2. On contrary every time in PWM ISR when QFLG[IEL] is setted, QPOSCNT is either 0 or QPOSMAX
3. I am using PWM ISR to check for QFLG[IEL] periodically, but when QFLG[IEL] is set, QEPSTS[QDLF] is not updated sometime
4. QEPSTS[PCEF] will mirror QEPSTS[QDLF] value
5. QFLG[PCE] will be setted whenever passing index position

I am not sure what happened. I didn't change any eQEP setting in f2806xqep_PM.h (found in PM_Sensorless project)

Thanks for reading, any reply is appreciated.

  • 0
    TI__Guru** 110970 points

    You might check if the encoder wires are connected correctly, and refer to the examples in the folder below to set the QEP.

    C:\ti\controlSUITE\development_kits\HVMotorCtrl+PfcKit_v2.1\HVPM_Sensored

    C:\ti\controlSUITE\device_support\f2806x\v151\F2806x_examples_ccsv5\eqep_pos_speed