If you are using a chip rated at 15 MHz, use 15000000. What is the maximum SPI speed your device can use? This is controlled by the first parameter in SPISettings.To write code for a new SPI device you need to note a few things: This allows you to have multiple SPI devices sharing the same CIPO, COPI, and CLK lines. When it's high, it ignores the Controller. When a device's Chip Select pin is low, it communicates with the Controller. CS (Chip Select) - the pin on each device that the Controller can use to enable and disable specific devices.SCK (Serial Clock) - The clock pulses which synchronize data transmission generated by the Controller.COPI (Controller Out Peripheral In) - The Controller line for sending data to the peripherals.CIPO (Controller In Peripheral Out) - The Peripheral line for sending data to the Controller.Typically there are three lines common to all the devices:
With an SPI connection there is always one Controller device (usually a microcontroller) which controls the peripheral devices. You can read more about SPI functions in the links below: The SPI Library is included in every Arduino core/platform, so you do not need to install it externally. See the table below to understand the new terminology: Master/Slave (OLD) Arduino no longer supports the use of this terminology. This article was revised on 8 by Karl Söderby.Ĭontroller/peripheral is formerly known as master/slave.
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