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109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
/******************************************************************************
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Copyright 2008-2009, Freie Universitaet Berlin (FUB). All rights reserved.
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These sources were developed at the Freie Universitaet Berlin, Computer Systems
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and Telematics group (http://cst.mi.fu-berlin.de).
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-------------------------------------------------------------------------------
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This file is part of FeuerWare.
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This program is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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FeuerWare is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see http://www.gnu.org/licenses/ .
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--------------------------------------------------------------------------------
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For further information and questions please use the web site
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http://scatterweb.mi.fu-berlin.de
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and the mailinglist (subscription via web site)
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scatterweb@lists.spline.inf.fu-berlin.de
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*******************************************************************************/
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/**
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* @ingroup ltc4150
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* @{
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*/
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/**
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* @file
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* @brief LTC4150 Coulomb Counter
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*
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* @author Freie Universität Berlin, Computer Systems & Telematics, FeuerWhere project
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* @author Heiko Will
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* @author Kaspar Schleiser <kaspar.schleiser@fu-berlin.de>
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*/
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#include <hwtimer.h>
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#include "ltc4150_arch.h"
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static volatile unsigned long int_count;
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static unsigned int last_int_time;
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static unsigned int last_int_duration;
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static unsigned int start_time;
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static double int_to_coulomb(int ints) {
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return ((double)ints) / (_GFH * _R_SENSE);
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}
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static double coulomb_to_mA(double coulomb){
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return (coulomb * 1000) / 3600;
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}
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uint32_t ltc4150_get_last_int_duration_us() {
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return HWTIMER_TICKS_TO_US(last_int_duration);
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}
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double ltc4150_get_current_mA() {
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return 1000000000/(ltc4150_get_last_int_duration_us()*(_GFH * _R_SENSE));
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}
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double ltc4150_get_total_mA() {
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return coulomb_to_mA(int_to_coulomb(int_count));
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}
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double ltc4150_get_avg_mA() {
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return (int_to_coulomb(int_count)*1000000000)/HWTIMER_TICKS_TO_US(last_int_time - start_time);
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}
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unsigned long ltc4150_get_intcount() {
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return int_count;
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}
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void ltc4150_init() {
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ltc4150_arch_init();
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}
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void ltc4150_start() {
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ltc4150_disable_int();
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int_count = 0;
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uint32_t now = hwtimer_now();
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ltc4150_sync_blocking();
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start_time = now;
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last_int_time = now;
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ltc4150_enable_int();
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}
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void ltc4150_stop() {
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ltc4150_disable_int();
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}
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void ltc4150_interrupt()
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{
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uint32_t now = hwtimer_now();
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if (now >= last_int_time) {
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last_int_duration = now - last_int_time;
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} else {
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last_int_duration = (0-1) - last_int_time + now + 1;
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}
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last_int_time = now;
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int_count++;
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}
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/** @} */
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