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[NRF52840] SPI and SPIS example!

I am working with SPI and SPIS examples ( sdk version 13). SPI of nrf52 is full duplex. In the example, I can send data from Master board to Slave board then Master board will receive response data from Slave board. if Master board does not send data to Slave board, Slave board will not send data to Master board. But I want Slave board can send data to the Master board without Master board send data to Slave board. Can I do that and how? Please help me!!!

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