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The latest Arduino Due controller expands the user’s capabilities and allows more tasks than other microcontrollers. Leonardo: MOSI – ICSP-4, MISO -ICSP-1, SCK -ICSP-3.Uno: MOSI corresponds to pin 11 or ICSP-4, MISO – 12 or ICSP-1, SCK – 13 or ICSP-3, SS (slave) – 10.
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This illustration shows the option of connecting an OLED-screen via SPI to an Arduino.įor each model of Arduino, there are different SPI pins. If you want to use it as a slave, you can use any digital pin as an SS. This connector does not have SS – originally provided that the Arduino microcontroller will act as a master device. These same pins are repeated in the ICSP interface. The Arduino board already contains special outputs for connecting the SPI interface. In the first case, when connecting, the Master addresses each connection individually in the second case, the connection takes place one by one, i.e., cascade. There are two types of connection in the SPI interface: independent and cascading. The modes may be demonstrated in the picture. Initially in Arduino, the data are transmitted by the senior bit forward, but before you start to clarify this in the documentation. Mode 0: SPI_MODE0: polarity (CPOL) 0, phase (CPHA) 0.If the level is low, 0 shall be recorded, and high – 1. The choice of the mode is determined by such indicators as polarity and phase of the clock pulse. The next step is to determine in which mode the information transfer will take place. Determined by the SPI.setClockDivider() function. Adjusted by the SPI.setDataMode() function. Determine the level at which the SCK line should be located if there is no clock pulse.The order is adjusted using the SPI.setBitOrder() function. Which bit should start the shift – with the senior or the junior.Interaction of the devices begins when a low signal level is fed to the SS output. This architecture allows interacting with several SPI devices connected to the same bus: MISO, MOSI, and SCK. Otherwise, data from the Master device will be ignored. The peripheral device (Slave) communicates with the Master when there is a low signal level on the SS output. SCLK – creates clock pulses for synchronous data transfer.MISO – used to transfer information to the Master from Slave.MOSI – this line transmits information to Slave from Master.Arduino boards have separate SPI outputs. SPI Outputs and ContactsĬommunication via SPI Arduino occurs between several devices that are located close to each other. The main advantage of working with this interface is considered high speed and the ability to connect multiple devices on the same data bus. SPI was invented and used by Motorola, but over time has become an industry standard. In our project, the Arduino board is most commonly used as a Master. SPI (Serial Peripheral Interface) is a widely used protocol for transferring data between a microcontroller (Master) and peripherals (Slave).