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rt_spi_send_then_recv是先发再等待一个独立的消息接收 rt_spi_transfer是收发同时进行 rt_spi_sendrecv8/16应使用rt_spi_transfer而不是rt_spi_send_then_recv
rt_spi_send_then_recv是先发再等待一个独立的消息接收 rt_spi_transfer是收发同时进行 rt_spi_sendrecv8/16应使用rt_spi_transfer而不是rt_spi_send_then_recv