esp8266 / esp8266/Arduino

SPI ESP8266 slave not working correct.

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Description

Hi,
I have problems using the ESP8266 as SPI slave.
I had modified the demo code as follow:
SPISlave.onData([](uint8_t * data, size_t len) {
SPISlave.setData("OK");
});
but the master can't correct to recieve,it can be found SPI timing no correct,"OK"(0x4f,0x4b) transfer 0x9f,0x96,it seem be shift a bit.

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