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Q： How will all the slaves send to the data to the master at the same time?
A：This is not possible using the McBSP. If TDM is used, each slave will have a time slot on the bus to transmit data, but the master cannot accept data from multiple slaves all at the same time. If TDM is not an approach you want to choose, you can also use the McBSP in SPI mode with multiple GPIOs as custom chip selects. Before the master sends data, it will set all slaves active by setting their chip selects low, transmit data, then make all slaves inactive by setting the chip select high. The master must control every transmission, so to read data back from a slave, the master should only enable one slave at a time to receive data. Look at multi-slave SPI protocols to see how this approach might work.
