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123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
/******************************************************************************
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* Copyright 2008-2009, Freie Universitaet Berlin (FUB). All rights reserved.
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*
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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 RIOT.
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*
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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 Heiko Will
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* @author Kaspar Schleiser <kaspar@schleiser.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 __attribute__((__no_instrument_function__)) int_to_coulomb(int ints)
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{
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return ((double)ints) / (_GFH * _R_SENSE);
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}
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static double __attribute__((__no_instrument_function__)) coulomb_to_mA(double coulomb)
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{
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return (coulomb * 1000) / 3600;
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}
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static double mAh_to_Joule(double mAh)
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{
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return (SUPPLY_VOLTAGE * mAh * 3600);
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}
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uint32_t ltc4150_get_last_int_duration_us(void)
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{
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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(void)
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{
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return 1000000000 / (ltc4150_get_last_int_duration_us() * (_GFH * _R_SENSE));
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}
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double __attribute__((__no_instrument_function__)) ltc4150_get_total_mAh(void)
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{
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return coulomb_to_mA(int_to_coulomb(int_count));
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}
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double ltc4150_get_total_Joule(void)
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{
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return mAh_to_Joule(ltc4150_get_total_mAh());
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}
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double ltc4150_get_avg_mA(void)
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{
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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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int ltc4150_get_interval(void)
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{
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return HWTIMER_TICKS_TO_US(last_int_time - start_time);
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}
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unsigned long __attribute__((__no_instrument_function__)) ltc4150_get_intcount(void)
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{
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return int_count;
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}
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void ltc4150_init(void)
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{
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ltc4150_arch_init();
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}
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void ltc4150_start(void)
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{
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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(void)
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{
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ltc4150_disable_int();
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}
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void __attribute__((__no_instrument_function__)) ltc4150_interrupt(void)
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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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}
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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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