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How to check if SD card is Inserted/Removed

ron123456
in Allwinner sunxi

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Hi, I am trying to write a program which will detect the presence of SD Card in Nano Pi M1 plus device. 

There are many ways to do this either by doing fdisk -l or looking into /dev/mmcblk* .

But I want to keep running it in a loop and doing fdisk -l and grep doesn't seems an appropriate way.

 

Can the insertion or removal of SD cards be checked via Hardware Interrupts? Plz. help me I am a newbie. 

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