ADS7843.c
103 lines
| 2.6 KiB
| text/x-c
|
CLexer
r71 | /*------------------------------------------------------------------------------ | |||
-- 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; | ||||
} | ||||