z1-phidgets.c

00001 /*
00002  * Copyright (c) 2010, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  * $Id: z1-phidgets.c,v 1.3 2010/11/05 10:31:57 joxe Exp $
00032  *
00033  * -----------------------------------------------------------------
00034  *
00035  * Author  : Joakim Eriksson
00036  * Created : 2010-02-02
00037  * Updated : $Date: 2010/11/05 10:31:57 $
00038  *           $Revision: 1.3 $
00039  */
00040 #include <io.h>
00041 #include "contiki.h"
00042 #include "lib/sensors.h"
00043 #include "dev/z1-phidgets.h"
00044 
00045 static uint8_t adc_on;
00046 static uint8_t active;
00047 /*---------------------------------------------------------------------------*/
00048 static void
00049 sensors_activate(uint8_t type)
00050 {
00051   uint8_t pre = adc_on;
00052 
00053   adc_on |= type;
00054 
00055   if(pre == 0 && adc_on > 0) {
00056     P6DIR = 0xff;
00057     P6OUT = 0x00;
00058     P6SEL |= 0x8b; /* bit 7 + 3 + 1 + 0 */
00059 
00060     /* if nothing was started before, start up the ADC system */
00061     /* Set up the ADC. */
00062     ADC12CTL0 = REF2_5V + SHT0_6 + SHT1_6 + MSC; /* Setup ADC12, ref., sampling time */
00063     ADC12CTL1 = SHP + CONSEQ_3 + CSTARTADD_0;   /* Use sampling timer, repeat-sequenc-of-channels */
00064     /* convert up to MEM4 */
00065     ADC12MCTL4 |= EOS;
00066 
00067     ADC12CTL0 |= ADC12ON + REFON;
00068     ADC12CTL0 |= ENC;           /* enable conversion */
00069     ADC12CTL0 |= ADC12SC;               /* sample & convert */
00070   }
00071 }
00072 /*---------------------------------------------------------------------------*/
00073 static void
00074 sensors_deactivate(uint8_t type)
00075 {
00076   adc_on &= ~type;
00077 
00078   if(adc_on == 0) {
00079     /* stop converting immediately, turn off reference voltage, etc. */
00080     /* wait for conversion to stop */
00081 
00082     ADC12CTL0 &= ~ENC;
00083     /* need to remove CONSEQ_3 if not EOS is configured */
00084     ADC12CTL1 &= ~CONSEQ_3;
00085 
00086     while(ADC12CTL1 & ADC12BUSY);
00087 
00088     ADC12CTL0 = 0;
00089     ADC12CTL1 = 0;
00090 
00091     P6DIR = 0x00;
00092     P6OUT = 0x00;
00093     P6SEL = 0x00;
00094   }
00095 }
00096 /*---------------------------------------------------------------------------*/
00097 static int
00098 value(int type)
00099 {
00100   /* ADC0 corresponds to the port under the logo, ADC1 to the port over the logo,
00101      ADC2 and ADC3 corresponds to port on the JCreate bottom expansion port) */
00102   switch(type) {
00103     case PHIDGET5V_1:
00104       return ADC12MEM0;
00105     case PHIDGET5V_2:
00106       return ADC12MEM1;
00107     case PHIDGET3V_1:
00108       return ADC12MEM2;
00109     case PHIDGET3V_2:
00110       return ADC12MEM3;
00111   }
00112   return 0;
00113 }
00114 /*---------------------------------------------------------------------------*/
00115 static int
00116 status(int type)
00117 {
00118   switch(type) {
00119     case SENSORS_ACTIVE:
00120     case SENSORS_READY:
00121       return active;
00122   }
00123   return 0;
00124 }
00125 /*---------------------------------------------------------------------------*/
00126 static int
00127 configure(int type, int c)
00128 {
00129   switch(type) {
00130     case SENSORS_ACTIVE:
00131       if(c) {
00132         if(!status(SENSORS_ACTIVE)) {
00133           /* SREF_1 is Vref+ */
00134           /* MemReg6 == P6.0/A0 == 5V 1  */
00135           ADC12MCTL0 = (INCH_0 + SREF_0);
00136           /* MemReg7 == P6.3/A3 == 5V 2 */
00137           ADC12MCTL1 = (INCH_3 + SREF_0);
00138           /* MemReg8 == P6.1/A1 == 3V 1 */
00139           ADC12MCTL2 = (INCH_1 + SREF_0);
00140           /* MemReg9 == P6.7/A7 == 3V_2 */
00141           ADC12MCTL3 = (INCH_7 + SREF_0);
00142 
00143           sensors_activate(0x0F);
00144           active = 1;
00145         }
00146       } else {
00147         sensors_deactivate(0x0F);
00148         active = 0;
00149       }
00150   }
00151   return 0;
00152 }
00153 /*---------------------------------------------------------------------------*/
00154 SENSORS_SENSOR(phidgets, "Phidgets", value, configure, status);

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