Spi Class Reference

Detailed Description

This file defines the SPI interface for libmraa

    mraa::Spi* spi;

    spi = new mraa::Spi(0);

    char data[] = {0x00, 100};
    char *recv;
    while (running == 0) {
        int i;
        for (i = 90; i < 130; i++) {
            data[1] = i;
            recv = spi->write(data, 2);
            printf("Writing -%i",i);
            printf("RECIVED-%i-%i\n",recv[0],recv[1]);
            usleep(100000);
        }
        for (i = 130; i > 90; i--) {
            data[1] = i;
            recv = spi->write(data, 2);
            printf("Writing -%i",i);
            printf("RECIVED-%i-%i\n",recv[0],recv[1]);
            usleep(100000);
        }

    }
    delete spi;

Public Member Functions
	Spi (int bus)
	~Spi ()
mraa_result_t	mode (mraa_spi_mode_t mode)
mraa_result_t	frequency (int hz)
char	write (char data)
char *	write (char *data, size_t length)
mraa_result_t	lsbmode (bool lsb)
mraa_result_t	bitPerWord (unsigned int bits)

Constructor & Destructor Documentation

Spi ( int  bus )

inline

Initialise SPI object using the board mapping to set muxes

Parameters

bus	to use, as listed in the platform definition, normally 0

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~Spi ( )

inline

Closes spi bus

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Member Function Documentation

mraa_result_t mode ( mraa_spi_mode_t  mode )

inline

Set the SPI device mode. see spidev0-3

Parameters

mode	the mode. See Linux spidev doc

Returns

Result of operation

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mraa_result_t frequency ( int  hz )

inline

Set the SPI device operating clock frequency

Parameters

hz	the frequency to set in hz

Returns

Result of operation

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char write ( char  data )

inline

Write single byte to the SPI device

Parameters

data	the byte to send

Returns

data received on the miso line

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char* write ( char *  data, size_t  length  )

inline

Write buffer of bytes to SPI device

Parameters

data	buffer to send
length	size of buffer to send

Returns

char* data received on the miso line. Same length as passed in

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mraa_result_t lsbmode ( bool  lsb )

inline

Change the SPI lsb mode

Parameters

lsb	Use least significant bit transmission - 0 for msbi

Returns

Result of operation

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mraa_result_t bitPerWord ( unsigned int  bits )

inline

Set bits per mode on transaction, default is 8

Parameters

bits	bits per word

Returns

Result of operation

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The documentation for this class was generated from the following file:

• /var/lib/jenkins/workspace/mraa-doc/api/mraa/spi.hpp