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esp8266/hspi: Enable duplex operation of hardware SPI
Without this, spi.read(1, 0xff) would use 16 clock cycles, first to send 0xff and then to receive one byte, as visible with a logic analyzer.
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Without this, spi.read(1, 0xff) would use 16 clock cycles, first to send 0xff and then to receive one byte, as visible with a logic analyzer.