i.MX ProcessorsのトピックRe: How to detect sd card insert/removal in user space code

How to detect sd card insert/removal in user space code

Dhevan — Thu, 11 Feb 2021 06:57:11 GMT

Hi,

We are using imx8m mini evk board.

SD card auto mounting is working fine.

But we want user space code detect to detect sd card insertion and removal.

Ubuntu i have tried netlink(libnl) suite https://www.infradead.org/~tgr/libnl/doc/core.html but not able to find proper apis.

Please help us solve the issue.

Thanks & Regards,

Vasu

Re: How to detect sd card insert/removal in user space code

b36401 — Fri, 12 Feb 2021 04:54:55 GMT

I can suggest to grep /var/log/messages for messages related to SD card.
I mean something like this:
[ 542.576330] mmc1: card 59b4 removed
and this:
[ 570.761873] mmc1: new high speed SDHC card at address 59b4

Re: How to detect sd card insert/removal in user space code

Dhevan — Mon, 01 Mar 2021 05:12:21 GMT

Hi @b36401,

We want to detect user space c/c++ code.

Do you have any suggestion detecting in user space c/c++ code ?

Thanks & Regards,

Vasu

Re: How to detect sd card insert/removal in user space code

b36401 — Wed, 10 Mar 2021 04:42:35 GMT

Another way (that may be more useful for C code) is to check if /dev/mmcblk1 appears.
I mean that the code may periodically check /dev/mmcblk1 filesystem entry for existing.