SPI.c

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/****************************************************************************
 * Copyright (C) 2015 Sensorian
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 * This file is part of Sensorian.                                          *
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 *   by the Free Software Foundation, either version 3 of the License, or   *
 *   (at your option) any later version.                                    *
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 *   Sensorian is distributed in the hope that it will be useful,           *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *   GNU Lesser General Public License for more details.                    *
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 *   License along with Sensorian.                                          *
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 ****************************************************************************/
 
#include "SPI.h"
#include <stdio.h>

void SPI_Initialize(void)
{   if (!bcm2835_init())
    {
        printf("BCM libray error.\n");          //Should be run with the sudo cmd
    }
    bcm2835_spi_begin();                        //Configure SPI pins
    bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST);        //Configure bit order
    bcm2835_spi_setDataMode(BCM2835_SPI_MODE0);             //Set clock polarity and phase CPOL=0, CPHA=0
    bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_8);   //SPI baud rate at 244 Khz
    bcm2835_spi_chipSelect(BCM2835_SPI_CS_NONE);            //Control CE0 in software
    printf("SPI initialized...\n");
}

unsigned char SPI_Write(unsigned char data)
{
    return bcm2835_spi_transfer(data);
}

unsigned char SPI_Read(void)
{
    unsigned char data = bcm2835_spi_transfer(0xff);
    return data;
}

void SPI_Write_Array(char* buff, unsigned int length)
{
    bcm2835_spi_writenb(buff,length);
}

void SPI_Read_Array(char* sArray, char* rArray, char length)
{
    bcm2835_spi_transfernb(sArray,rArray,length);
}

void SPI_Close(void)
{
    bcm2835_spi_end();
}