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85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/**
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******************************************************************************
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* @addtogroup PIOS PIOS Core hardware abstraction layer
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* @{
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* @addtogroup PIOS_PWM PWM Input Functions
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* @brief Code to measure with PWM input
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* @{
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*
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* @file pios_pwm.c
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* @brief PWM Input functions (STM32 dependent)
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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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/* Project Includes */
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#include "pios.h"
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#if defined(PIOS_INCLUDE_RTC)
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#ifndef PIOS_RTC_PRESCALAR
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#define PIOS_RTC_PRESCALAR 100
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#endif
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void PIOS_RTC_Init()
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{
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_BKP | RCC_APB1Periph_PWR,
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ENABLE);
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PWR_BackupAccessCmd(ENABLE);
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RCC_RTCCLKConfig(RCC_RTCCLKSource_HSE_Div128);
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RCC_RTCCLKCmd(ENABLE);
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RTC_WaitForLastTask();
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RTC_WaitForSynchro();
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RTC_WaitForLastTask();
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#if defined(PIOS_INCLUDE_SPEKTRUM) || defined(PIOS_INCLUDE_SBUS)
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/* Enable the RTC Second interrupt */
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RTC_ITConfig( RTC_IT_SEC, ENABLE );
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/* Wait until last write operation on RTC registers has finished */
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RTC_WaitForLastTask();
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#endif
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RTC_SetPrescaler(PIOS_RTC_PRESCALAR); // counting at 8e6 / 128
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RTC_WaitForLastTask();
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RTC_SetCounter(0);
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RTC_WaitForLastTask();
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}
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uint32_t PIOS_RTC_Counter()
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{
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return RTC_GetCounter();
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}
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float PIOS_RTC_Rate()
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{
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return (float) (8e6 / 128) / (1 + PIOS_RTC_PRESCALAR);
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}
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float PIOS_RTC_MsPerTick()
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{
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return 1000.0f / PIOS_RTC_Rate();
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}
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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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