topic Re: IMXRT1176 LPADC2 Support in i.MX RT Crossover MCUs

IMXRT1176 LPADC2 Support

Vignesh_S — Mon, 11 Jul 2022 08:10:45 GMT

We used lpadc_polling example to read the data in ADC1. Its working fine.

But we need to read ADC2 channels for our project, If I change the base address of ADC1 with ADC2 its not working.

Can you please share any working example for ADC2?

Re: IMXRT1176 LPADC2 Support

jingpan — Tue, 12 Jul 2022 04:27:22 GMT

Hi @Vignesh_S ,

Just change DEMO_LPADC_BASE definition from LPADC1 to LPADC2 is enough.

I tested on RT1170 EVK, define DEMO_LPADC_USER_CHANNEL to 4 (because LPADC2 CH0 doesn't pin out on the board). It works fine.

Regards,

Jing

Re: IMXRT1176 LPADC2 Support

Vignesh_S — Tue, 12 Jul 2022 08:00:33 GMT

Im using 6 channels in ADC1 and 1 channel in ADC2. Shall we configure the same trigger to individually read all channels?

Re: IMXRT1176 LPADC2 Support

jingpan — Wed, 13 Jul 2022 08:05:36 GMT

Hi @Vignesh_S ,

No, ETC has 8 ext_hwts. You have enough trig channels to both of two adc.

But of course you can use one trig source to trig all 7 channel by trig chain mechanism.

Regards,

Jing

Re: IMXRT1176 LPADC2 Support

Andy_h — Wed, 13 Jul 2022 14:26:19 GMT

Hello,

i have a similar problem. While using the adc_etc interrupt test, just changing the ADC base doesn't work. Do i need to do more config changes?

Re: IMXRT1176 LPADC2 Support

jingpan — Thu, 14 Jul 2022 04:46:16 GMT

Hi,

DEMO_LPADC_BASE definition from LPADC1 to LPADC2, and DEMO_LPADC_USER_CHANNEL to 4. That's all what I did on the polling example. But if you test the interrupt example, you should also modify the interrupt related code.

Regards,

Jing