Parametrics for KV1x and FlexTimer Quadrature Decoding

[ralphcorderoy]

Hi, I'm interested in Quadrature Decoding for three Phase{A,B} inputs.  The FlexTimer module can do this, but it seems the 6-channel FTs don't make the Quadrature Decoding available, e.g. KV11P64M75RM.pdf, Rev. 3, May 2015, KV11 Sub-Family Reference Manual, covers the sixteen MKV{10,11}Z{64,128}V{FM,LC,LF,LH}7 and FTMx_QDCTRL appears in Ch. 36's memory map for FTM{0..5} suggesting that the 6ch FTM0 and FTM3 can do QD.  But Signal Descriptions and Multiplexing, 10.4.6 on page 189 has PH{A,B} for only FTM{1,2,4,5} and not the 6ch FTM{0,3} so the signals aren't made available?  Have I interpreted that correctly?

This matters because some KV10 have 1x6ch + 2x2ch, all with FTMx_QDCTRL, suggesting it would be sufficient for my three Phase{A,B}, but I'm getting the impression 6ch just don't make their QD available.

The Parametric chooser has a column "Quad Encoder", note "En", not "De".  The possible value seems to be just "1" as a checkbox, e.g. ARM Cortex-M0+|Kinetis KV1x Motor Control MCUs|NXP  What does this QE column refer to?  (Each column heading could do with a help bubble that pops up on hover to expand the definition.)  I couldn't find a FlexTimer column telling me how many of 6ch and 2ch were available.  How do I search for this?

Cheers, Ralph.

[xiangjun_rong]

Hi,

I have checked the reference manual of KV10, as you know that the KV10 sub-family has FTM0, FTM1 and FTM2, only FTM2 and FTM1 modules support quadrature decoder function.

The quadrature decodering have dedicated pins which are different from the FTM channel pins. For KV10, PTA1 is multiplexed with FTM2_QD_PHA, PTA2 is multiplexed with FTM2_QD_PHB. 

For KV10, PTB0 is multiplexed with FTM1_QD_PHA, PTB1 is multiplexed with FTM1_QD_PHB.

In other words, if you use FTM2 as quadrature decoder, pls connect PhaseA/PhaseB to PTA1 and PTA2. If you use FTM1 as quadture decoder, pls connect PhaseA/PhaseB to PTB0 and PTB1.

Hope it can help you

BR

Xiangjun Rong