/*------------------------------------------------------------------------------
--  This file is a part of the libuc, microcontroler library
--  Copyright (C) 2013, Alexis Jeandet
--
--  This program is free software; you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation; either version 3 of the License, or
--  (at your option) any later version.
--
--  This program is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--  GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with this program; if not, write to the Free Software
--  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-------------------------------------------------------------------------------
--                 Author : Alexis Jeandet
--                   Mail : alexis.jeandet@member.fsf.org
-------------------------------------------------------------------------------*/

#include <ADS7843.h>
#include <core.h>

int ads7843init(ADS7843_t *dev, spi_t spidev,void (*setnCS)(char),int (*busy)())
{
    dev->spidev = spidev;
    dev->setnCS = setnCS;
    dev->busy = busy;
    dev->setnCS(1);
    return 1;
}




int ads7843read(ADS7843_t *dev,int* x,int* y)
{
    int data;
    *x=0;
    *y=0;
    spiputw(dev->spidev,0x97);
//    delay_100us(2);
    while(dev->busy());
    spigetw2(dev->spidev,0);
    spigetw2(dev->spidev,0);
    delay_100us(100);
    for(int i=0;i<32;i++)
    {
        data=0;
        dev->setnCS(0);
        spiputw(dev->spidev,0x97);
        //delay_100us(2);
        while(dev->busy());
        data= (0x0FF & spigetw2(dev->spidev,0))<<8;
        data+= 0x0FF & spigetw2(dev->spidev,0);
        *x+=data>>4;
        dev->setnCS(1);
        delay_100us(10);
    }
    spiputw(dev->spidev,0xd7);
//    delay_100us(2);
    while(dev->busy());
    spigetw2(dev->spidev,0);
    spigetw2(dev->spidev,0);
    delay_100us(10);
    for(int i=0;i<32;i++)
    {
        data=0;
        dev->setnCS(0);
        spiputw(dev->spidev,0xd7);
//        delay_100us(2);
        while(dev->busy());
        data= (spigetw2(dev->spidev,0))<<8;
        data+= spigetw2(dev->spidev,0);
        *y+=data>>4;
        dev->setnCS(1);
        delay_100us(10);
    }
    *x/=32;
    *y/=32;
    return 1;
}