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how to use spi 2 cs



hi  everyone,

i want to connect 256p spi flash chip which has 2 cs pins to be selected once at a time with dm365.
i want to know  how to find the spi bus has done sending shift reg data.
i has to ctrl cs pin manually cus dm365 does not support 2 cs pin at 4 pin mode (si so clk cs).
the flash chip need cs to be ctrl so that it knows the data is over.
any  ideas?
regards  mike