Contiki 2.6
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00001 /* 00002 * Copyright (c) 2005, 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: sht11-sensor.c,v 1.2 2010/01/15 08:51:21 adamdunkels Exp $ 00032 */ 00033 00034 #include <stdlib.h> 00035 00036 #include "contiki.h" 00037 #include "lib/sensors.h" 00038 #include "dev/sht11.h" 00039 #include "dev/sht11-sensor.h" 00040 00041 const struct sensors_sensor sht11_sensor; 00042 00043 enum { 00044 ON, OFF 00045 }; 00046 static uint8_t state = OFF; 00047 00048 /*---------------------------------------------------------------------------*/ 00049 static int 00050 value(int type) 00051 { 00052 switch(type) { 00053 /* Photosynthetically Active Radiation. */ 00054 case SHT11_SENSOR_TEMP: 00055 return sht11_temp();; 00056 00057 /* Total Solar Radiation. */ 00058 case SHT11_SENSOR_HUMIDITY: 00059 return sht11_humidity(); 00060 00061 case SHT11_SENSOR_BATTERY_INDICATOR: 00062 return sht11_sreg() & 0x40? 1: 0; 00063 } 00064 return 0; 00065 } 00066 /*---------------------------------------------------------------------------*/ 00067 static int 00068 status(int type) 00069 { 00070 switch(type) { 00071 case SENSORS_ACTIVE: 00072 case SENSORS_READY: 00073 return (state == ON); 00074 } 00075 return 0; 00076 } 00077 00078 /*---------------------------------------------------------------------------*/ 00079 static int 00080 configure(int type, int c) 00081 { 00082 switch(type) { 00083 case SENSORS_ACTIVE: 00084 if(c) { 00085 if(!status(SENSORS_ACTIVE)) { 00086 rtimer_clock_t t0; 00087 sht11_init(); 00088 state = ON; 00089 00090 /* For for about 11 ms before the SHT11 can be used. */ 00091 t0 = RTIMER_NOW(); 00092 while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + RTIMER_SECOND / 100)); 00093 } 00094 } else { 00095 sht11_off(); 00096 state = OFF; 00097 } 00098 } 00099 return 0; 00100 } 00101 /*---------------------------------------------------------------------------*/ 00102 SENSORS_SENSOR(sht11_sensor, "sht11", 00103 value, configure, status);