topic i.MXRT1060 ADC external trigger (ADC_ETC) for ADC 2 in i.MX RT Crossover MCUs

i.MXRT1060 ADC external trigger (ADC_ETC) for ADC 2

cedric1 — Wed, 09 Oct 2019 21:00:54 GMT

There are two instance of ADC in i.MXRT1060. I can make ADC 1 work with external trigger on pin J11 GPIO_AD_B1_00 using ADC channel 5. This pin can also work with ADC 2. I can make ADC 2 work fine when using software trigger, but I can't make it work with external trigger. I think it has something to do with the TSC. I did try to set ADC_ETC.TSC_BYPASS and ADC_ETC.EXT0_TRIG_ENABLE. Any idea why I can't make ADC 2 work with ADC_ETC on this pin?

Thanks,

Cedric

Re: i.MXRT1060 ADC external trigger (ADC_ETC) for ADC 2

jeremyzhou — Fri, 11 Oct 2019 10:50:14 GMT

Hi Cédric Lemay,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
I'd like to gather more information about your implementation,
so whether you can introduce the steps you did, especial the code parts.

Have a great day,
TIC

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Re: i.MXRT1060 ADC external trigger (ADC_ETC) for ADC 2

cedric1 — Fri, 11 Oct 2019 13:30:39 GMT

Hi jeremyzhou,

I found my problem. Turns out I had to use XBAR1, instead of XBAR0, to trigger ADC2. I couldn't find anything on the documentation about that, so I had to guess and try. It works now.

Thanks,

Cedric

Re: i.MXRT1060 ADC external trigger (ADC_ETC) for ADC 2

jeremyzhou — Mon, 14 Oct 2019 02:01:24 GMT

Hi Cédric Lemay,

Thanks for your reply and I'm glad to hear the problem is solved.
According to your reply, whether it means tha you need to use the XBAR1(XBARA), the XBAR2 and XBARB (XBARB) is unavailable.

Have a great day,
TIC

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