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acadc4bc28
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@1955 ebee16cc-31ac-478f-84a7-5cbb03baadba
157 lines
5.3 KiB
C
157 lines
5.3 KiB
C
/**
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******************************************************************************
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*
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* @file stopwatch.c
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* @brief Stop watch function
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "stopwatch.h"
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#include "main.h"
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// *****************************************************************************
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uint32_t resolution_us = 0;
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// *****************************************************************************
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// initialise the stopwatch
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void STOPWATCH_init(uint32_t resolution)
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{
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resolution_us = resolution;
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if (resolution_us == 0)
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return;
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// enable timer clock
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switch ((uint32_t)STOPWATCH_TIMER)
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{
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case (uint32_t)TIM1: RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); break;
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case (uint32_t)TIM2: RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); break;
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case (uint32_t)TIM3: RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); break;
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case (uint32_t)TIM4: RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); break;
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#ifdef STM32F10X_HD
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case (uint32_t)TIM5: RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); break;
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case (uint32_t)TIM6: RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE); break;
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case (uint32_t)TIM7: RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM7, ENABLE); break;
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case (uint32_t)TIM8: RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE); break;
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#endif
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}
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// time base configuration
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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TIM_TimeBaseStructure.TIM_Period = 0xffff; // max period
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TIM_TimeBaseStructure.TIM_Prescaler = ((PIOS_MASTER_CLOCK / 1000000) * resolution_us) - 1; // <resolution> uS accuracy @ 72 MHz
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TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit(STOPWATCH_TIMER, &TIM_TimeBaseStructure);
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// enable interrupt request
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TIM_ITConfig(STOPWATCH_TIMER, TIM_IT_Update, ENABLE);
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// start counter
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TIM_Cmd(STOPWATCH_TIMER, ENABLE);
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}
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// *****************************************************************************
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// timer interrupt
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/*
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#ifdef STM32F10X_MD
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#if (STOPWATCH_TIMER == TIM1)
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void TIM1_IRQHandler(void)
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#if (STOPWATCH_TIMER == TIM2)
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void TIM2_IRQHandler(void)
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#elif (STOPWATCH_TIMER == TIM3)
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void TIM3_IRQHandler(void)
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#elif (STOPWATCH_TIMER == TIM4)
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void TIM4_IRQHandler(void)
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#endif
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#endif
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#ifdef STM32F10X_HD
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#if (STOPWATCH_TIMER == TIM1)
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void TIM1_IRQHandler(void)
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#if (STOPWATCH_TIMER == TIM2)
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void TIM2_IRQHandler(void)
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#elif (STOPWATCH_TIMER == TIM3)
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void TIM3_IRQHandler(void)
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#elif (STOPWATCH_TIMER == TIM4)
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void TIM4_IRQHandler(void)
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#elif (STOPWATCH_TIMER == TIM5)
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void TIM5_IRQHandler(void)
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#elif (STOPWATCH_TIMER == TIM6)
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void TIM6_IRQHandler(void)
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#elif (STOPWATCH_TIMER == TIM7)
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void TIM7_IRQHandler(void)
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#elif (STOPWATCH_TIMER == TIM8)
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void TIM8_IRQHandler(void)
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#endif
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#endif
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{
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}
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*/
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// *****************************************************************************
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// resets the stopwatch
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void STOPWATCH_reset(void)
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{
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if (resolution_us > 0)
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{ // reset the counter
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STOPWATCH_TIMER->CNT = 1; // set to 1 instead of 0 to avoid new IRQ request
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TIM_ClearITPendingBit(STOPWATCH_TIMER, TIM_IT_Update);
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}
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}
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// *****************************************************************************
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// returns the timer count since the last STOPWATCH_reset() call
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// return 0xffffffff if counter overrun or not initialised
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uint32_t STOPWATCH_get_count(void)
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{
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uint32_t value = STOPWATCH_TIMER->CNT; // get counter value ASAP
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if (resolution_us == 0)
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return 0xffffffff; // not initialized
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if (TIM_GetITStatus(STOPWATCH_TIMER, TIM_IT_Update) != RESET)
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return 0xffffffff; // timer overfloaw
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return value; // return the timer count
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}
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// *****************************************************************************
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// returns number of us since the last STOPWATCH_reset() call
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// return 0xffffffff if counter overrun or not initialised
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uint32_t STOPWATCH_get_us(void)
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{
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uint32_t value = STOPWATCH_TIMER->CNT; // get counter value ASAP
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if (resolution_us == 0)
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return 0xffffffff; // not initialized
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if (TIM_GetITStatus(STOPWATCH_TIMER, TIM_IT_Update) != RESET)
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return 0xffffffff; // timer overfloaw
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return (value * resolution_us); // return number of micro seconds
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}
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// *****************************************************************************
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