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sd card example not working fine

Hi All,

I am working on fatfs example from sdk 12.2.0 on pca10040, nrf52 dk, nrf52832. And i did not change anything in the code but it seems that my sd card is not getting initialized as i am getting following message on putty:-

APP:INFO: FATFS example.

APP:INFO:Initializing disk 0 (SDC)...

APP:INFO:Disk initialization failed.

and on debug, my code goes into this if condition in diskio_blkdev.c file:- Line no.-81

if (m_drives[drv].config.wait_func == NULL)
{
    m_drives[drv].config.wait_func = default_wait_func;
}

can anyone help me understand the reason behind why this is happening and how i should deal with it?

Thank in advance.

Regards

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