I am using STM32H7 family of microcontroller as SPI Master Transmit device which needs to talk to 4 SPI slave devices receive only which are also all STM32H7 MCU's. Both master and slave are configured for software slave management. The confusion is how slave will identify when master wants to talk to it or transmit data to it without using hardware NSS pin? How slave device will start receiving in this scenario and stop receiving when all data transmitted?
