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LibrePilot/flight/PiOS/STM32F4xx/pios_rtc.c
2013-03-24 13:03:56 +02:00

140 lines
3.6 KiB
C

/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_PWM PWM Input Functions
* @brief Code to measure with PWM input
* @{
*
* @file pios_pwm.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
* @brief PWM Input functions (STM32 dependent)
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pios.h"
#ifdef PIOS_INCLUDE_RTC
#include <pios_rtc_priv.h>
#ifndef PIOS_RTC_PRESCALER
#define PIOS_RTC_PRESCALER 100
#endif
struct rtc_callback_entry {
void (*fn)(uint32_t);
uint32_t data;
};
#define PIOS_RTC_MAX_CALLBACKS 3
struct rtc_callback_entry rtc_callback_list[PIOS_RTC_MAX_CALLBACKS];
static uint8_t rtc_callback_next = 0;
void PIOS_RTC_Init(const struct pios_rtc_cfg * cfg)
{
RCC_BackupResetCmd(ENABLE);
RCC_BackupResetCmd(DISABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
PWR_BackupAccessCmd(ENABLE);
// Divide external 8 MHz clock to 1 MHz
RCC_RTCCLKConfig(cfg->clksrc);
RCC_RTCCLKCmd(ENABLE);
RTC_WakeUpCmd(DISABLE);
// Divide 1 Mhz clock by 16 -> 62.5 khz
RTC_WakeUpClockConfig(RTC_WakeUpClock_RTCCLK_Div16);
// Divide 62.5 khz by 200 to get 625 Hz
RTC_SetWakeUpCounter(cfg->prescaler); //cfg->prescaler);
RTC_WakeUpCmd(ENABLE);
/* Configure and enable the RTC Second interrupt */
EXTI_InitTypeDef ExtiInit = {
.EXTI_Line = EXTI_Line22, // matches above GPIO pin
.EXTI_Mode = EXTI_Mode_Interrupt,
.EXTI_Trigger = EXTI_Trigger_Rising,
.EXTI_LineCmd = ENABLE,
};
EXTI_Init(&ExtiInit);
NVIC_Init(&cfg->irq.init);
RTC_ITConfig(RTC_IT_WUT, ENABLE);
RTC_ClearFlag(RTC_FLAG_WUTF);
}
uint32_t PIOS_RTC_Counter()
{
return RTC_GetWakeUpCounter();
}
/* FIXME: This shouldn't use hard-coded clock rates, dividers or prescalers.
* Should get these from the cfg struct passed to init.
*/
float PIOS_RTC_Rate()
{
return (float) (8e6 / 128) / (1 + PIOS_RTC_PRESCALER);
}
float PIOS_RTC_MsPerTick()
{
return 1000.0f / PIOS_RTC_Rate();
}
/* TODO: This needs a mutex around rtc_callbacks[] */
bool PIOS_RTC_RegisterTickCallback(void (*fn)(uint32_t id), uint32_t data)
{
struct rtc_callback_entry * cb;
if (rtc_callback_next >= PIOS_RTC_MAX_CALLBACKS) {
return false;
}
cb = &rtc_callback_list[rtc_callback_next++];
cb->fn = fn;
cb->data = data;
return true;
}
void PIOS_RTC_irq_handler (void)
{
if (RTC_GetITStatus(RTC_IT_WUT))
{
/* Call all registered callbacks */
for (uint8_t i = 0; i < rtc_callback_next; i++) {
struct rtc_callback_entry * cb = &rtc_callback_list[i];
if (cb->fn) {
(cb->fn)(cb->data);
}
}
/* Clear the RTC Second interrupt */
RTC_ClearITPendingBit(RTC_IT_WUT);
}
if (EXTI_GetITStatus(EXTI_Line22) != RESET)
EXTI_ClearITPendingBit(EXTI_Line22);
}
#endif /* PIOS_INCLUDE_RTC */
/**
* @}
* @}
*/