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/*------------------------------------------------------------------------------
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-- This file is a part of the libuc, microcontroler library
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-- Copyright (C) 2013, Alexis Jeandet
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-------------------------------------------------------------------------------
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-- Author : Alexis Jeandet
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-- Mail : alexis.jeandet@member.fsf.org
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-------------------------------------------------------------------------------*/
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#include <ADS7843.h>
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#include <core.h>
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int ads7843init(ADS7843_t *dev, spi_t spidev, char config, void (*setnCS)(char), int (*busy)())
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{
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dev->spidev = spidev;
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dev->setnCS = setnCS;
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dev->busy = busy;
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dev->setnCS(1);
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dev->config = config & ADS7843_CONFIG_MASK;
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dev->xMax = 1000;
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dev->xMin = 0;
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dev->yMax = 1000;
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dev->yMin = 0;
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dev->zeroRtouch = 0;
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dev->zeroX = 500;
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dev->zeroY = 500;
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dev->delta = 200;
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return 1;
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}
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unsigned int __ads7843read(ADS7843_t *dev,char cfg)
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{
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unsigned int data;
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dev->setnCS(0);
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while(dev->busy());
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spiputw(dev->spidev,ADS7843_START|dev->config|cfg);
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data= (0x0FF & spigetw2(dev->spidev,0))<<8;
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data+= 0x0FF & spigetw2(dev->spidev,0);
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dev->setnCS(1);
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return (data>>4);
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}
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int ads7843read(ADS7843_t *dev,int* x,int* y)
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{
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*x=0;
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*y=0;
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for(int i=0;i<32;i++)
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{
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*x += __ads7843read(dev,ADS7843_MEAS_X_POS_DIFF|ADS7843_POWER_REF_ON|ADS7843_POWER_ADC_ON);
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*y += __ads7843read(dev,ADS7843_MEAS_Y_POS_DIFF|ADS7843_POWER_REF_ON|ADS7843_POWER_ADC_ON);
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}
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*x>>=5;
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*y>>=5;
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*x = ((*x-dev->xMin)*1000)/(dev->xMax-dev->xMin);
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*y = ((*y-dev->yMin)*1000)/(dev->yMax-dev->yMin);
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return 1;
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}
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int ads7843readRtouch(ADS7843_t *dev)
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{
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#define avg 32
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int z1=0,z2=0,x=0;
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for(int i=0;i<avg;i++)
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{
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x += __ads7843read(dev,ADS7843_MEAS_X_POS_DIFF|ADS7843_POWER_REF_ON|ADS7843_POWER_ADC_ON);
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z1 += __ads7843read(dev,ADS7843_MEAS_Z1_POS_DIFF|ADS7843_POWER_REF_ON|ADS7843_POWER_ADC_ON);
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z2 += __ads7843read(dev,ADS7843_MEAS_Z2_POS_DIFF|ADS7843_POWER_REF_ON|ADS7843_POWER_ADC_ON);
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}
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return (x/(4096/avg))*((z2/z1)-1);
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}
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int ads7843calibrate(ADS7843_t *dev, uint16_t zeroX, uint16_t zeroY, uint16_t zeroRtouch, uint16_t xMin, uint16_t xMax, uint16_t yMin, uint16_t yMax, char delta)
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{
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dev->xMax = xMax;
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dev->xMin = xMin;
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dev->yMax = yMax;
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dev->yMin = yMin;
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dev->zeroRtouch = zeroRtouch;
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dev->zeroX = zeroX;
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dev->zeroY = zeroY;
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dev->delta = delta;
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}
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int ads7843isPenTouching(ADS7843_t *dev)
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{
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int rtc= ads7843readRtouch(dev);
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return ((rtc+dev->delta) < dev->zeroRtouch);
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}
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