232 lines
7 KiB
C
232 lines
7 KiB
C
/*
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* Copyright (c) 2016, Zolertia - http://www.zolertia.com
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup zoul-adc-sensors
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* @{
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*
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* \file
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* Generic driver for the Zoul ADC wrapper for analogue sensors
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "sys/clock.h"
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#include "dev/ioc.h"
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#include "dev/gpio.h"
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#include "dev/adc.h"
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#include "adc-sensors.h"
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#include "adc-zoul.h"
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#include "zoul-sensors.h"
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#include <stdio.h>
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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#define DEBUG 0
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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typedef struct {
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int type;
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uint8_t pin_mask;
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uint8_t vdd3;
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} adc_info_t;
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typedef struct {
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uint8_t sensors_num;
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uint8_t sensors_ports;
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adc_info_t sensor[ADC_SENSORS_MAX];
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} adc_wrapper_t;
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static adc_wrapper_t sensors;
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/*---------------------------------------------------------------------------*/
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static uint16_t
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convert_to_value(uint8_t index)
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{
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uint32_t value;
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value = adc_zoul.value(sensors.sensor[index].pin_mask);
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if(value == ZOUL_SENSORS_ERROR) {
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PRINTF("ADC sensors: failed retrieving data\n");
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return ADC_WRAPPER_ERROR;
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}
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/* Default voltage divisor relation is 5/3 aprox, change at adc_wrapper.h,
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* calculations below assume a decimation rate of 512 (12 bits ENOB) and
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* AVVD5 voltage reference of 3.3V
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*/
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if(!sensors.sensor[index].vdd3) {
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value *= ADC_WRAPPER_EXTERNAL_VREF;
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value /= ADC_WRAPPER_EXTERNAL_VREF_CROSSVAL;
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}
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switch(sensors.sensor[index].type) {
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case ANALOG_GROVE_LIGHT:
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/* Light dependant resistor (LDR) resistance value*/
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value = (10230 - (value * 10)) / value;
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/* TODO: With the resistance we could calculate the lux as 63*R^(-0.7) */
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return (uint16_t)value;
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case ANALOG_GROVE_LOUDNESS:
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/* Based on the LM2904 amplifier (blue version with potentiometer) */
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return (uint16_t)value;
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case ANALOG_PHIDGET_ROTATION_1109:
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/* Linear sensor with 0-300º, 300/33000 = 0.00909 */
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value *= 909;
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value /= 100000;
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return (uint16_t)value;
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/* VDD+5 sensors */
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case ANALOG_VAC_SENSOR:
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/* Linear sensor from 0 to 5 V; 0.0088 resolution*/
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value *= 88;
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value /= 10000;
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return (uint16_t)value;
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case ANALOG_AAC_SENSOR:
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/* Linear sensor from 0 to 5 V;*/
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return (uint16_t)value;
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default:
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return ADC_WRAPPER_ERROR;
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}
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return ADC_WRAPPER_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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is_sensor_in_list(int type)
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{
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uint8_t i;
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for(i = 0; i <= sensors.sensors_num; i++) {
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if(sensors.sensor[i].type == type) {
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return i + 1;
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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value(int type)
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{
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uint8_t index;
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uint16_t sensor_value;
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index = is_sensor_in_list(type);
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if(!index) {
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PRINTF("ADC sensors: sensor not registered\n");
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return ADC_WRAPPER_SUCCESS;
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}
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/* Restore index value after the check */
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index -= 1;
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sensor_value = convert_to_value(index);
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return sensor_value;
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}
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/*---------------------------------------------------------------------------*/
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static int
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configure(int type, int value)
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{
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uint8_t pin_mask = GPIO_PIN_MASK(value);
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if((type != ANALOG_GROVE_LIGHT) && (type != ANALOG_PHIDGET_ROTATION_1109) &&
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(type != ANALOG_GROVE_LOUDNESS) && (type != ANALOG_VAC_SENSOR) &&
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(type != ANALOG_AAC_SENSOR) ) {
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PRINTF("ADC sensors: sensor not supported, check adc_wrapper.h header\n");
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return ADC_WRAPPER_ERROR;
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}
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if(sensors.sensors_num >= ADC_SENSORS_MAX) {
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PRINTF("ADC sensors: all adc channels available have been assigned\n");
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return ADC_WRAPPER_ERROR;
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}
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if((value < 0x01) || (value > 0x07) || (value == BUTTON_USER_PIN)) {
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PRINTF("ADC sensors: invalid pin value, (PA0-PA1, PA3) are reserved\n");
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return ADC_WRAPPER_ERROR;
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}
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if(sensors.sensors_ports & pin_mask) {
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PRINTF("ADC sensors: a sensor has been already assigned to this pin\n");
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return ADC_WRAPPER_ERROR;
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}
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switch(type) {
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/* V+3.3 sensors */
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case ANALOG_GROVE_LIGHT:
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case ANALOG_GROVE_LOUDNESS:
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case ANALOG_PHIDGET_ROTATION_1109:
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if(adc_zoul.configure(SENSORS_HW_INIT, pin_mask) == ZOUL_SENSORS_ERROR) {
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return ADC_WRAPPER_ERROR;
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}
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sensors.sensor[sensors.sensors_num].type = type;
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sensors.sensor[sensors.sensors_num].pin_mask = pin_mask;
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sensors.sensor[sensors.sensors_num].vdd3 = 1;
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break;
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/*V+5 sensors*/
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case ANALOG_VAC_SENSOR:
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case ANALOG_AAC_SENSOR:
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if(adc_zoul.configure(SENSORS_HW_INIT, pin_mask) == ZOUL_SENSORS_ERROR) {
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return ADC_WRAPPER_ERROR;
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}
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sensors.sensor[sensors.sensors_num].type = type;
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sensors.sensor[sensors.sensors_num].pin_mask = pin_mask;
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sensors.sensor[sensors.sensors_num].vdd3 = 0;
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break;
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default:
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return ADC_WRAPPER_ERROR;
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}
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PRINTF("ADC sensors: type %u mask 0x%02X vdd3 %u\n",
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sensors.sensor[sensors.sensors_num].type,
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sensors.sensor[sensors.sensors_num].pin_mask,
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sensors.sensor[sensors.sensors_num].vdd3);
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sensors.sensors_num++;
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sensors.sensors_ports |= pin_mask;
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return ADC_WRAPPER_SUCCESS;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(adc_sensors, ADC_SENSORS, value, configure, NULL);
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/*---------------------------------------------------------------------------*/
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/** @} */
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