/* * Copyright (c) 2010, Loughborough University - Computer Science * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This file is part of the Contiki operating system. */ /** * \file * ADC sensor module for sensinode devices. * * This file respects configuration in contiki-conf.h. It also turns * off features which are not present in the model that we are * building for. * * \author * George Oikonomou - */ #include "dev/sensinode-sensors.h" #if ADC_SENSOR_ON SENSORS_SENSOR(adc_sensor, ADC_SENSOR, value, configure, status); static uint8_t ready; /*---------------------------------------------------------------------------*/ static int value(int type) { uint16_t reading; /* * For single-shot AD conversions, we may only write to ADCCON3[3:0] once * (This write triggers the conversion). We thus use the variable 'command' * to store intermediate steps (reference, decimation rate, input channel) */ uint8_t command; ADCCFG = 0; /* Enables/Disables Input Channel */ /* 1.25V ref, max decimation rate */ command = ADEDIV1 | ADEDIV0; /* Clear the Interrupt Flag */ TCON_ADCIF = 0; /* Depending on the desired reading, append the input bits to 'command' and * enable the corresponding input channel in ADCCFG if necessary */ switch(type) { #if TEMP_SENSOR_ON case ADC_SENSOR_TYPE_TEMP: command |= ADECH3 | ADECH2 | ADECH1; break; #endif #if ACC_SENSOR_ON case ADC_SENSOR_TYPE_ACC_X: ADCCFG = ADC5EN; command |= ADECH2 | ADECH0; break; case ADC_SENSOR_TYPE_ACC_Y: ADCCFG = ADC6EN; command |= ADECH2 | ADECH1; break; case ADC_SENSOR_TYPE_ACC_Z: ADCCFG = ADC7EN; command |= ADECH2 | ADECH1 | ADECH0; break; #endif #if VDD_SENSOR_ON case ADC_SENSOR_TYPE_VDD: command |= ADECH3 | ADECH2 | ADECH1 | ADECH0; break; #endif #if LIGHT_SENSOR_ON case ADC_SENSOR_TYPE_LIGHT: ADCCFG = ADC0EN; break; #endif #if BATTERY_SENSOR_ON case ADC_SENSOR_TYPE_BATTERY: ADCCFG = ADC1EN; command |= ADECH0 | ADEREF1; /* AVDD_SOC reference */ break; #endif default: /* If the sensor is not present or disabled in conf, return -1 */ return -1; } /* Writing in bits 3:0 of ADCCON3 will trigger a single conversion */ ADCCON3 = command; /* * When the conversion is complete, the ADC interrupt flag is set. We don't * use an ISR here, we just wait on the flag and clear it afterwards. */ while(!TCON_ADCIF); /* Clear the Interrupt Flag */ TCON_ADCIF = 0; reading = 0; reading = ADCL; reading |= (((uint8_t) ADCH) << 8); /* 12-bit decimation rate: 4 LS bits are noise */ reading >>= 4; return reading; } /*---------------------------------------------------------------------------*/ static int status(int type) { return ready; } /*---------------------------------------------------------------------------*/ /* * On N740 we can control Ill and Acc individually: * ADC_VAL_OTHERS 0x01 * ADC_VAL_LIGHT_ON 0x04 * ADC_VAL_ACC_ON 0x08 * ADC_VAL_ACC_GSEL 0x10 * * Return Value is always light | acc | acc_gsel * * SENSORS_ACTIVE: * - 1: Activate everything, use default setting for ACC G-select * - 0: Turn everything off * - xyz: Mask with the defines above and act accordingly. * * SENSORS_READY: * - Return Status (0: all off or a value based on the defines above) */ static int configure(int type, int value) { #ifdef MODEL_N740 /* * Read current state of the ser-par, ignoring current sensor settings * Those will be set all over depending on VALUE */ uint8_t ser_par_val = n740_ser_par_get() & 0xF2; #endif /* MODEL_N740 */ /* 'Others' are either compiled in or not. Can't be turned on/off */ ready = ADC_VAL_ALL; switch(type) { case SENSORS_HW_INIT: case SENSORS_ACTIVE: #ifdef MODEL_N740 if(value == ADC_VAL_ALL) { value = ADC_VAL_ACC_ON | ADC_VAL_LIGHT_ON; #if ACC_SENSOR_GSEL value |= ADC_VAL_ACC_GSEL; #endif /* ACC_SENSOR_GSEL */ } #endif /* MODEL_N740 */ /* OK, Now value definitely specifies our bits, start masking * We will refuse to turn things on if they are specified OFF in conf. */ #ifdef MODEL_N740 #if ACC_SENSOR_ON if(value & ADC_VAL_ACC_ON) { P0SEL |= 0x80 | 0x40 | 0x20; ser_par_val |= N740_SER_PAR_ACC; ready |= ADC_VAL_ACC_ON; #if ACC_SENSOR_GSEL if(value & ADC_VAL_ACC_GSEL) { ser_par_val |= N740_SER_PAR_ACC_GSEL; ready |= ADC_VAL_ACC_GSEL; } #endif /*ACC_SENSOR_GSEL */ } #endif /* ACC_SENSOR_ON */ #if LIGHT_SENSOR_ON if(value & ADC_VAL_LIGHT_ON) { ser_par_val |= N740_SER_PAR_LIGHT; ready |= ADC_VAL_LIGHT_ON; } #endif /* LIGHT_SENSOR_ON */ n740_ser_par_set(ser_par_val); #endif /* MODEL_N740 */ } return ready; } #endif /* ADC_SENSOR_ON */