WhyCan Forum(哇酷开发者社区)

I2S貌似不可以配置， SPI可以。
如果真是这样，只能交换主从了。

http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fi2s.html

TX data is written to the SDOUT pin on the falling edge of SCK, and RX data is read from the SDIN pin on the rising edge of SCK. The most significant bit (MSB) is always transmitted first.

TX数据在SCK的下降沿写入SDOUT引脚，而RX数据在SCK的上升沿从SDIN引脚读取。 最重要的位（MSB）总是先传送。