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TMS320F280025C: How to explain the eQEP count error with GPIO Qualification?

Shaoxing Ke
Expert 3590 points

Part Number: TMS320F280025C

Tool/software:

Hi Experts,

The customer only adds 6 cycles Qualification to QEPI, which results in a QEP count error. According to the understanding of Quadraute Decoder State Machine, a QEP count error should not occur.

  • 0
    TI__Mastermind 27736 points

    Hi Shaoxing,

    I have tested this using eqep_ex2_pos_speed. When using no sampling I see posSpeed->speedRPMFR = 299/300, when using 6 samples I see the same results.

    Are there any other noise sources that could be influencing their QEPI input signal? 

    Best,

    Ryan Ma