Acquired event doesn't happen in NRF51822 as spi slave

[trk]

Hey everyone., I was trying to use nrf51822 as spi slave and just a heads up to know that i use Nrf51822 as master. I see that when chip select CS gets low SPI needs to acquire semaphore in spi But when i was trying to debug. My program doesn't hit NRF_ACQUIRE. So where am i going wrong?

[trk]

I checked it. But my program does not go into loop at any point of the code.Thanks for reply tough @ARYAN