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SPI

## begin()

#### Description

Initializes the SPI bus by setting SCK, MOSI, and SS to outputs, pulling SCK and MOSI low, and SS high.

Extended method for Arduino Due
If you specify one of the Arduino Due's Slave Select (SS) pin in the call to SPI.begin(), the pin is configured to be directly managed by the SPI interface.

Note that once the pin is configured, you can't use it anymore as a general I/O, unless you call the SPI.end() method on the same pin.

The only pins that can be configured to be managed by SPI interface are the Arduino Due's Slave Select pins: 4, 10, 52 and 54 (correspond to A0).

More info on extended methods: Due Extended SPI usage

#### Syntax

SPI.begin()
SPI.begin(slaveSelectPin) | (Arduino Due only)

#### Parameters

slaveSelectPin: | slave device SS pin | (Arduino Due only)

#### Returns

None

#### See also

- SPI.end()
- SPI.setClockDivider()
- SPI.setDataMode()
- SPI.setBitOrder()

- Due Extended SPI usage
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Corrections, suggestions, and new documentation should be posted to the Forum.

The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

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