[i.mx8mm] How can I allocate REF_CLK_32K to GPIO1_IO00?

[bbq56go]

Dear

I am trying to enable the 32KHz i.MX8MM 32KHz clock at GPIO1_IO00 (ALT5 : CCM_REF_CLK_32K) for a custom board. 

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But, I could not see any clock in this pin on Oscilloscope.

[Q]

- How can I allocate REF_CLK_32K to GPIO1_IO00?

- Is any additional setting needed to output 32KHz from REF_CLK_32K?

Thanks.

[gusarambula]

Hello JaeHo PARK,

Are you using the Pins Tool for i.MX to setup the muxing options for your board? If not, I would highly recommend that you do to aide on your design. You can find this tool on the link below:

https://www.nxp.com/design/designs/pins-tool-for-i-mx-application-processors:PINS-TOOL-IMX

The register in which you would setup the ALT5 option to get the CCM_REF_CLK_32K signal to the GPIO1_IO00 pin.

#define BOARD_INITPINS_IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO00_VALUE                   0x00000005   /*!< Register name: IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO00 */

The Pins tool can help you creating the necessary code.

I hope this helps!
Regards,

[bbq56go]

Thanks for your response.

I did use the tool above your mention.

And, I edited my dts file.

But, I could not see 32KHz in this pin.