86 lines
No EOL
3.1 KiB
C
86 lines
No EOL
3.1 KiB
C
/*
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* Copyright (c) 2012, BinaryLabs.
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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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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: battery-sensor.h,v 1.1 2012/08/25 19:34:06 nifi Exp $
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*/
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/**
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* \file
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* Battery sensor file for Atmega128rfa1.
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* \author
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* Paulo Louro <paulolouro@binarylabs.dk>
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* Harald Pichler <harald@the-develop.net>
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*/
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/**
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*The atmel rf23x radios have a low voltage detector that can be configured in units of 75 millivolts. Here is example *code for the ATmega128rfa1, where the BATMON register is in extended io space [dak664]
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*/
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#include "dev/battery-sensor.h"
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const struct sensors_sensor battery_sensor;
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/*---------------------------------------------------------------------------*/
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/**
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* \return Voltage on battery measurement with BATMON register.
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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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uint16_t h;
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uint8_t p1;
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BATMON = 16; //give BATMON time to stabilize at highest range and lowest voltage
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/* Bandgap can't be measured against supply voltage in this chip. */
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/* Use BATMON register instead */
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for ( p1=16; p1<31; p1++) {
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BATMON = p1;
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clock_delay_usec(100); // delay needed !!
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if ((BATMON&(1<<BATMON_OK))==0) break;
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}
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h=2550-75*16-75+75*p1; //-75 to take the floor of the 75 mv transition window
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return h;
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}
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/*---------------------------------------------------------------------------*/
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static int
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configure(int type, int c)
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{
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// No configuration needed. readADC() handles all the config needed.
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return type == SENSORS_ACTIVE;
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}
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/*---------------------------------------------------------------------------*/
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static int
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status(int type)
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{
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// analog sensors are always ready
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(battery_sensor, BATTERY_SENSOR, value, configure, status); |