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Libraries \ SPI

Reference for Wiring version 1.0 Build 0100+ If you have a previous version, use the reference included with your software. If see any errors or have any comments, let us know.

Name |

### begin()

Examples |
    // starts SPI default: SPI_MASTER, MSBFIRST, SPI_MODE3, SPI_CLOCK_DIV4
    SPI.begin();

    // starts SPI with specific parameters
    SPI.begin(SPI_MASTER, LSBFIRST, SPI_MODE3, SPI_CLOCK_DIV4);
Description | The Serial Peripheral Interface Bus or SPI bus is a synchronous serial data link standard named by Motorola that operates in full duplex mode. Devices communicate in a master/slave mode where the master device initiates the data frame. Multiple slave devices are allowed with individual slave select (chip select) lines using a pin for each device. The begin() method starts SPI communication. On Wiring v1 boards the SPI pins are: SS=24, MOSI=25, MISO=26 and SCK=27. On Wiring S board the SPI pins are: SS=20, MOSI=21, MISO=22 and SCK=23.
Syntax |
    SPI.begin()
    SPI.begin(mode,bitOrder,dataMode,clockDivider)
Parameters |

mode | constant for the mode of operation: SPI_MASTER (master) or SPI_SLAVE (slave)
bitOrder | MSBFIRST or LSBFIRST: the bit order to use. MSBFIRST stands for most significant bit first (leftmost bit), LSBFIRST stands for less significant bit first (rightmost bit).
dataMode | constant for the data mode: SPI_MODE0 (leading edge Sample rising, trailing edge Setup falling), SPI_MODE1 (leading edge Setup rising, trailing edge Sample falling), SPI_MODE2 (leading edge Sample falling, trailing edge Setup rising), SPI_MODE3 (leading edge Setup falling, trailing edge Sample rising)
clockDivider | constant for the speed clock divider used for the communication, clockDivider is a fraction of the main CPU clock speed: SPI_CLOCK_DIV4 (1/4th of the CPU speed), SPI_CLOCK_DIV16 (1/16th of the CPU speed), SPI_CLOCK_DIV64 (1/64th of the CPU speed), SPI_CLOCK_DIV128 (1/128th of the CPU speed), SPI_CLOCK_DIV2 (1/2 of the CPU speed), SPI_CLOCK_DIV8 (1/8th of the CPU speed), SPI_CLOCK_DIV32 (1/32th of the CPU speed) or SPI_CLOCK_DIV64 (1/64th of the CPU speed)

Returns | None
Usage | Application

Updated on July 07, 2011 11:11:42pm PDT