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SPI couldn't read after update SDK 9.0

Hi. All.

I am in the process of update SDK 9.0 from 5.2. Meanwhile, SPI couldn't read from external flash's data. Unusually SPI works well before infinite loop, I tested several times read and write before infinite loop, but it couldn't read on interrupt or APP_TIMER(I just tested in this module, but I think it doesn't work every time except before infinite loop). The reason why I express "couldn't read" is I checked signals by using Logic Analyzer. The write signals are occurred correctly that from nRF51822 to external flash, after that the other side signals are also occurred correctly. But variable p_rx_buf is still '0', so I think SPI couldn't read that signals. What can I do for this problem? Please give a advice.

Best Regards.

Jongkyu.

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