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EM1402板子

Other Parts Discussed in Thread: EMB1428Q, EM1402EVM

EM1402评估板中,三块EMB1428Q和一个DAC同时接了一个SPI,我认为是通过图中的芯片进行片选的,请问怎么去对四个进行片选,或者是其他的方式,麻烦详细解释一下