Kinetis MicrocontrollersのトピックRe: K21 and K22 FTM quadrature decoder.

K21 and K22 FTM quadrature decoder.

husainsab1 — Tue, 03 Jan 2017 09:21:07 GMT

HI,

I am working on K21 and K22. in that i need to implement the pulse count, using the FTM quadrature decoder.

i have mapped FTM0_CH1 for receiving the data.

Thank you..

Re: K21 and K22 FTM quadrature decoder.

egoodii — Tue, 03 Jan 2017 14:43:13 GMT

QEI inputs, and index capture

NOTE! FTM0 is NOT (at least in most Kinetis parts!) QD capable --- check chapter 3 of the appropriate Reference Manual under FlexTimer Configuration, Instantiations-table. And of course quadrature-edge-counting requires two channels, A and B: QD-capable FTMs always seem to be exactly two-channel, so those connect to both 'channel pins'. QD mode DOESN'T, however, use them with any channel LOGIC --- you can use THOSE blocks to capture both edges of an INDEX indication.

Re: K21 and K22 FTM quadrature decoder.

Robin_Shen — Wed, 04 Jan 2017 01:08:45 GMT

Hi husain,

Please check the chapter 3 in Reference Manual first to ensure wheteher the FTM module has the Quadrature decoder feature or not.

You can refer the demo "ftm_quad_decoder" in KINETIS-SDK.

For example: search K22 then select FRDM-K22F and download SDK_2.1_FRDM-K22F.

You can getting start with KSDK reading "How to start with KSDK".

Best Regards,

Robin

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