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Problem with nrf51822 in spi slave mode

Hello all

I making some device with ARM core CPU with nRF51822.

I set CPU to SPI master and set nRF51822 to slave. And then I read some data from nRF51822, that was always "0x55" or "0xAA". That depend on configuration of POL and PHA in master side.

Do you guess what is wrong?

B. Regards,