Kinetis MicrocontrollersのトピックRe: Kinetis MK64FN1M0VLL12 – I2C Bus Lock Issue After Wake from STOP Mode?

Kinetis MK64FN1M0VLL12 – I2C Bus Lock Issue After Wake from STOP Mode?

werovsee — Sat, 05 Apr 2025 10:09:05 GMT

Hi all,

I’m working with the MK64FN1M0VLL12 MCU and running into a weird issue with the I2C bus after waking up from STOP mode. Occasionally, the I2C communication freezes and the SDA line gets stuck low. I suspect it's a bus lock, but I'm not sure the best way to recover without a full reset.

I'm using KSDK 2.x and FreeRTOS, and the I2C is configured in interrupt mode.

Thanks!

Re: Kinetis MK64FN1M0VLL12 – I2C Bus Lock Issue After Wake from STOP Mode?

werovsee — Sun, 06 Apr 2025 07:21:06 GMT

@werov see wrote:

Hi all,
I’m working with the MK64FN1M0VLL12 MCU and running into a weird issue with the I2C bus after waking up from STOP mode. Occasionally, the I2C communication freezes and the SDA line gets stuck low. I suspect it's a bus lock, but I'm not sure the best way to recover without a full reset.
I'm using KSDK 2.x and FreeRTOS, and the I2C is configured in interrupt mode.
Thanks!

.....?? anyone

Re: Kinetis MK64FN1M0VLL12 – I2C Bus Lock Issue After Wake from STOP Mode?

Celeste_Liu — Tue, 08 Apr 2025 03:29:04 GMT

Hello @werovsee ,

Thanks for your post.

Are you using a reference board or a custom board?

If it's a reference board, what is the SCH Version of the board (there is a label pasted on the back of the board)? And please refer to the FRDM-K64F Board Errata to check if it matches the situation.

If it's a custom board, you can refer to the errata for MK64FN1M0VLL12 and see if the following workaround is effective.

BRs,

Celeste

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