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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 |

### setClockDivider()

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 setClockDivider() method the speed clock rate 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). 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.setClockDivider(clockDivider)
Parameters |

clockDivider | constant: SPI_CLOCK_DIV4, SPI_CLOCK_DIV16, SPI_CLOCK_DIV64, SPI_CLOCK_DIV128, SPI_CLOCK_DIV2, SPI_CLOCK_DIV8, SPI_CLOCK_DIV32 or SPI_CLOCK_DIV64

Returns | None
Usage | Application

Updated on July 07, 2011 11:11:43pm PDT