About GPIOs as the wake-up source from LPSR mode of i.MX7S

[yuuki]

Dear all,

We want to use LPSR mode of i.MX7S.
And we want to wake-up a system by an interrupt from GPIO.

The following is explained in a reference manual.

GPIO1_IO00-IO07 are supplied power to by NVCC_GPIO1, and GPIO1_IO08-IO15 are supplied power to by NVCC_GPIO2.

GPIO1_IO00-IO07 are explained in LPSR.
 - 8.2.5 IOMUXC LPSR Memory Map/Register Definition

However, GPIO1_IO8-IO15 are explained in the following(not LPSR).
 - 8.2.7 IOMUXC Memory Map/Register Definition

It seems that those are not included in LPSR,
Can GPIO1_IO8-IO15 be used as a wake-up source from LPSR mode?

May I have advice?

Best Regards,
Yuuki

[igorpadykov]

Hi Yuuki

>Can GPIO1_IO8-IO15 be used as a wake-up source from LPSR mode?

yes. GPIO1_IO00-IO07 are explained in LPSR since it may have alternative

iomux settings in LPSR.

Best regards
igor
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[yuuki]

Dear Igor-san,

Thank you for your support.

> yes. GPIO1_IO00-IO07 are explained in LPSR since it may have alternative iomux settings in LPSR.

=>

Is GPIO1_IO00-IO07 a mistake of GPIO1_IO08-IO15?

Best Regards,

Yuuki

[igorpadykov · Accepted solution]

Hi Yuuki

>Is GPIO1_IO00-IO07 a mistake of GPIO1_IO08-IO15?

no. It shows just more capabilities for GPIO1_IO00-IO07,

both can be used in LPSR and both wake.

Best regards
igor

[yuuki]

igorpadykov‌

Dear Igor-san,

We checked about these GPIOs in LPSR mode.

NVCC_GPIO1 and NVCC_GPIO2 are supplied power to by VDD_LPSR(1.8V).

In LPSR mode,

GPIO1_IO00-GPIO1_IO07 can hold output High.

However, GPIO1_IO08-GPIO1_IO15 can not hold output High.(The output voltage drops to Low.)

Is there any necessary setting?

GPIO1_IO08-GPIO1_IO15 can be worked normally in LPSR mode?

When it is in RUN mode, GPIO1_IO08-GPIO1_IO15 works normally.

And I understand that GPIO1_IO08-GPIO1_IO15 can be used as wake-up source.

May I have advice?

Best Regards,

Yuuki

[igorpadykov]

Hi Yuuki

>And I understand that GPIO1_IO08-GPIO1_IO15 can be used as wake-up source.

yes they can be used. Note, it should be configured as inputs, not outputs.

Best regards
igor