Contiki 2.6
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00001 /* 00002 * Copyright (c) 2011, George Oikonomou - <oikonomou@users.sourceforge.net> 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 00032 /** 00033 * \file 00034 * ADC sensor module for TI SmartRF05EB devices. 00035 * 00036 * \author 00037 * George Oikonomou - <oikonomou@users.sourceforge.net> 00038 */ 00039 #include "sfr-bits.h" 00040 #include "cc253x.h" 00041 #include "adc-sensor.h" 00042 00043 #if ADC_SENSOR_ON 00044 /*---------------------------------------------------------------------------*/ 00045 static int 00046 value(int type) 00047 { 00048 uint16_t reading; 00049 /* 00050 * For single-shot AD conversions, we may only write to ADCCON3[3:0] once 00051 * (This write triggers the conversion). We thus use the variable 'command' 00052 * to store intermediate steps (reference, decimation rate, input channel) 00053 */ 00054 uint8_t command; 00055 00056 /* 1.25V ref, max decimation rate */ 00057 command = ADCCON3_EDIV1 | ADCCON3_EDIV0; 00058 00059 /* Clear the Interrupt Flag */ 00060 ADCIF = 0; 00061 00062 /* Depending on the desired reading, append the input bits to 'command' and 00063 * enable the corresponding input channel in ADCCFG if necessary */ 00064 switch(type) { 00065 #if TEMP_SENSOR_ON 00066 case ADC_SENSOR_TYPE_TEMP: 00067 command |= ADCCON3_ECH3 | ADCCON3_ECH2 | ADCCON3_ECH1; 00068 break; 00069 #endif 00070 #if VDD_SENSOR_ON 00071 case ADC_SENSOR_TYPE_VDD: 00072 command |= ADCCON3_ECH3 | ADCCON3_ECH2 | ADCCON3_ECH1 | ADCCON3_ECH0; 00073 break; 00074 #endif 00075 default: 00076 /* If the sensor is not present or disabled in conf, return -1 */ 00077 return -1; 00078 } 00079 00080 /* Writing in bits 3:0 of ADCCON3 will trigger a single conversion */ 00081 ADCCON3 = command; 00082 00083 /* 00084 * When the conversion is complete, the ADC interrupt flag is set. We don't 00085 * use an ISR here, we just wait on the flag and clear it afterwards. 00086 */ 00087 while(!ADCIF); 00088 00089 /* Clear the Interrupt Flag */ 00090 ADCIF = 0; 00091 00092 reading = ADCL; 00093 reading |= (((uint8_t) ADCH) << 8); 00094 /* 12-bit decimation rate: 4 LS bits are noise */ 00095 reading >>= 4; 00096 00097 return reading; 00098 } 00099 /*---------------------------------------------------------------------------*/ 00100 static int 00101 status(int type) 00102 { 00103 return 1; 00104 } 00105 /*---------------------------------------------------------------------------*/ 00106 static int 00107 configure(int type, int value) 00108 { 00109 switch(type) { 00110 case SENSORS_HW_INIT: 00111 #if TEMP_SENSOR_ON 00112 /* Connect temperature sensor to the SoC */ 00113 ATEST = 1; 00114 TESTREG0 = 1; 00115 #endif 00116 APCFG = 0; /* Disables Input Channels */ 00117 break; 00118 } 00119 return 1; 00120 } 00121 /*---------------------------------------------------------------------------*/ 00122 SENSORS_SENSOR(adc_sensor, ADC_SENSOR, value, configure, status); 00123 #endif /* ADC_SENSOR_ON */