Kinetis Software Development KitのトピックExample of adc16 with hardware trigger

Example of adc16 with hardware trigger

davepfaltzgraff — Fri, 07 Aug 2015 19:21:15 GMT

I would like like to use a hardware input to trigger an ADC conversion. As I understand the manual, this could be either through the PDB or directly with the ADHWT input, but I'm not able to make the full connection.

My design has a front end with a peak detector that gives a rising edge when the peak is found. I know I could use that edge as an interrupt to generate a software trigger and achieve the same result. But, if possible, I'd like the hardware to initiate that process and thus save the interrupt latency time.

Is there an example that would show me the way?

Thanks

Re: Example of adc16 with hardware trigger

Alice_Yang — Mon, 10 Aug 2015 01:52:17 GMT

Hello David,

Which chip do you use ?

For example the frdmk64, you can find the adc_hw_trigger demo here :

...\Freescale\KSDK_1.2.0\examples\frdmk64f\demo_apps , under it , there have the PDB trigger ADC demo code .

Hope it helps

Have a great day,

Alice

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Re: Example of adc16 with hardware trigger

davepfaltzgraff — Mon, 10 Aug 2015 13:19:14 GMT

Hi Alice,

Thanks for the pointer. I am using the FRDM-K22F and see that there a corresponding example there. I'll look into it.

Dave