Migration from nrf sdk 17.02 to ncs : Requesting starting point

Hello Nordic.

I used nrf52832 and nrf52840 by nrf sdk.

But I need to develop nrf5340 now, and I understand I have to use ncs to develop firmware for nrf5340.

I have some questions.

1. In previous work for nrf52840 by nrf sdk, I used functions of Timer, PPI, SPI, and BLE notification.

Now I'm trying to integrate some example codes in ncs for each functions. 

However, I can not find example for BLE notification. 

Can you recommend examples for PPI, SPI, and BLE notification?

2. I am little confused because nrf5340 has dual-core.

When I used nrf52840, I just wrote one code for MCU. 

In case of nRF5340, Is it same?

If it is right, If I try to send data via BLE in main.c, Does nRF5340 automatically force network core to do this job?

Or, Is there another requirement to use network core for BLE?

Thank you for help.

Best regards,

Seunghun.

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