# SPI example # supports just as master device # # order: LSBFIRST, MSBFIRST # mode: MODE0, MODE1, MODE2, MODE3 # clockdiv CLOCK_DIV2, CLOCK_DIV4, ... , CLOCK_DIV256 # clockdiv default: CLOCK_DIV4 # see http://arduino.cc/en/Reference/SPI # initialization, depends on the target device. spi = SPI.new(SPI::LSBFIRST, SPI::MODE0, SPI::CLOCK_DIV4) # starts transmission as master ss low digitalWrite(D10, 0) # sends 1byte and returns 1byte result = spi.transfer(0xff) # ends transmission as master ss high digitalWrite(D10, 1)