![]() So the leading edge is a rising edge. If CPOL=1, the clock is idle at 1 and each cycle consists of 0 pulses. This means that the leading edge is a trailing edge. The polarity and phase of the clock signal according to the four transmission modes can be seen in the table: ModeĬPOL determines the polarity of the clock signal.ĬPOL=0 is the clock signal, which defaults to 0 and all pulses are 1. These transfer modes determine whether the data is stepped on the rising or falling edge of the clock (clock phase) and when the clock is idle, high or low (this is clock polarity). The third parameter is one of four transmission modes: SPI_MODE0, SPI_MODE1, SPI_MODE2, SPI_MODE3 ![]() The second parameter, the bit order, determines which bit the transfer starts with (LSBFIRST or MSBFIRST). ![]() The first parameter is the transmission speed of the SPI, it must be specified in Hertz. Allows you to set the SPI baud rate used by the SPI class. Its value can be 4, 8, 16, 32, 64, 128 or 256 MHz for most Arduinos. SPISettings is used to configure the SPI port of the SPI device. The SPISettings object has 3 parameters, these are the communication speed the data order and clock phase and polarity.
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