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RTC. Final polishing. 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/rtc_dev@3275 35acf78f-673a-0410-8e92-d51de3d6d3f4
master
barthess 2011-08-31 16:32:34 +00:00
parent 3da3cc2789
commit 5e62285d17
6 changed files with 47 additions and 43 deletions
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2
os/hal/dox/rtc.dox
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@ -24,6 +24,8 @@
* @details This module defines an abstract interface for Real Time Clock cell.
* If you do not need callback functionality than disable
* @p RTC_SUPPORTS_CALLBACKS option in @p halconf.h.
* In @p halconf.h you also can select clock source for RTC in
* @p RTC_CLOCK_SOURCE option.
*
* @pre In order to use the RTC driver the @p HAL_USE_RTC option
* must be enabled in @p halconf.h.

10
os/hal/include/rtc.h
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@ -37,16 +37,6 @@
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/* TODO: move this to hal_lld_f103.h & mcuconf.h */
#define STM32_LSECLK 32768 /**< Low speed external clock. */
/* RCC_CFGR register bits definitions.*/
#define STM32_RTC_NONE (0 << 8) /**< */
#define STM32_RTC_LSE (1 << 8) /**< LSE oscillator clock used as RTC clock */
#define STM32_RTC_LSI (2 << 8) /**< LSI oscillator clock used as RTC clock */
#define STM32_RTC_HSE (3 << 8) /**< HSE oscillator clock divided by 128 used as RTC clock */
/*===========================================================================*/
/* Driver pre-compile time settings. */

57
os/hal/platforms/STM32/rtc_lld.c
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@ -30,31 +30,6 @@
#include "hal.h"
// TODO: defines look in 4492 stm32f10x.h
/** The RTCCLK clock source can be either the HSE/128, LSE or LSI clocks. This is selected
by programming the RTCSEL[1:0] bits in the Backup domain control register (RCC_BDCR).
This selection
CANNOT
be modified without resetting the Backup domain.
The LSE clock is in the Backup domain, whereas the HSE and LSI clocks are not.
Consequently:
* If LSE is selected as RTC clock:
– The RTC continues to work even if the VDD supply is switched off, provided the
VBAT supply is maintained.
* If LSI is selected as Auto-Wakeup unit (AWU) clock:
– The AWU state is not guaranteed if the VDD supply is powered off. Refer to
Section 6.2.5: LSI clock on page 87 for more details on LSI calibration.
* If the HSE clock divided by 128 is used as the RTC clock:
– The RTC state is not guaranteed if the VDD supply is powered off or if the internal
voltage regulator is powered off (removing power from the 1.8 V domain).
– The DPB bit (Disable backup domain write protection) in the Power controller
register must be set to 1 (refer to Section 4.4.1: Power control register
(PWR_CR)).
*/
#if HAL_USE_RTC || defined(__DOXYGEN__)
/*===========================================================================*/
@ -137,13 +112,37 @@ void rtc_lld_init(void){
PWR->CR |= PWR_CR_DBP; /* enable access */
if (!(RCC->BDCR & (RCC_BDCR_RTCEN | RCC_BDCR_LSEON))){ /* BKP domain was reseted */
RCC->BDCR |= STM32_RTC_LSE; /* select clocking from LSE */
RCC->BDCR |= RTC_CLOCK_SOURCE; /* select clocking from LSE */
RCC->BDCR |= RCC_BDCR_LSEON; /* switch LSE on */
while(!(RCC->BDCR & RCC_BDCR_LSEON)) /* wait for stabilization */
;
RCC->BDCR |= RCC_BDCR_RTCEN; /* run clock */
}
#if defined(RTC_CLOCK_SOURCE) == defined(RCC_BDCR_RTCSEL_LSE)
uint32_t preload = STM32_LSECLK - 1UL;
#elif defined(RTC_CLOCK_SOURCE) == defined(RCC_BDCR_RTCSEL_LSI)
uint32_t preload = STM32_LSICLK - 1UL;
#elif defined(RTC_CLOCK_SOURCE) == defined(RCC_BDCR_RTCSEL_HSE)
uint32_t preload = (STM32_HSICLK / 128UL) - 1UL;
#else
#error "RTC clock source not selected"
#endif /* RTC_CLOCK_SOURCE == RCC_BDCR_RTCSEL_LSE */
/* Write preload register only if value changed */
if (preload != (((uint32_t)(RTC->PRLH)) << 16) + RTC->PRLH){
while(!(RTC->CRL & RTC_CRL_RTOFF))
;
RTC->CRL |= RTC_CRL_CNF; /* switch on configure mode */
RTC->PRLH = (uint16_t)((preload >> 16) & 0b1111); /* write preloader */
RTC->PRLL = (uint16_t)(preload & 0xFFFF);
RTC->CRL &= ~RTC_CRL_CNF; /* switch off configure mode */
while(!(RTC->CRL & RTC_CRL_RTOFF)) /* wait for completion */
;
}
/* Ensure that RTC_CNT and RTC_DIV contain actual values after enabling
* clocking on APB1, because these values only update when APB1 functioning.*/
RTC->CRL &= ~(RTC_CRL_RSF);
@ -181,7 +180,8 @@ void rtc_lld_start(RTCDriver *rtcp, const RTCConfig *rtccfgp){
isr_flags |= RTC_CRH_SECIE;
}
RTC->CRL &= ~(RTC_CRL_SECF | RTC_CRL_ALRF | RTC_CRL_OWF); /* clear all even flags*/
/* clear all event flags just to be safe */
RTC->CRL &= ~(RTC_CRL_SECF | RTC_CRL_ALRF | RTC_CRL_OWF);
RTC->CRH |= isr_flags;
}
@ -201,14 +201,11 @@ void rtc_lld_stop(void){
* @param[in] tv_sec time value in UNIX notation.
*/
void rtc_lld_set_time(uint32_t tv_sec){
uint32_t preload = STM32_LSECLK - 1UL;
while(!(RTC->CRL & RTC_CRL_RTOFF))
;
RTC->CRL |= RTC_CRL_CNF; /* switch on configure mode */
RTC->PRLH = (uint16_t)((preload >> 16) & 0b1111); /* write preloader */
RTC->PRLL = (uint16_t)(preload & 0xFFFF);
RTC->CNTH = (uint16_t)((tv_sec >> 16) & 0xFFFF); /* write time */
RTC->CNTL = (uint16_t)(tv_sec & 0xFFFF);
RTC->CRL &= ~RTC_CRL_CNF; /* switch off configure mode */

8
os/hal/platforms/STM32/rtc_lld.h
View File

@ -47,6 +47,14 @@
#define RTC_SUPPORTS_CALLBACKS TRUE
#endif
/**
* @brief Clock source selecting. LSE by default.
*/
#if !defined(RTC_CLOCK_SOURCE) || defined(__DOXYGEN__)
#define RTC_CLOCK_SOURCE RCC_BDCR_RTCSEL_LSE
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/

6
os/hal/src/rtc.c
View File

@ -92,14 +92,14 @@ void rtcSetTime(uint32_t tv_sec){
/**
* @brief Return current time in UNIX notation.
*/
uint32_t rtcGetSec(void){
inline uint32_t rtcGetSec(void){
return rtc_lld_get_sec();
}
/**
* @brief Return fractional part of current time (milliseconds).
*/
uint16_t rtcGetMsec(void){
inline uint16_t rtcGetMsec(void){
return rtc_lld_get_msec();
}
@ -113,7 +113,7 @@ void rtcSetAlarm(uint32_t tv_alarm){
/**
* @brief Get current alarm date in UNIX notation.
*/
uint32_t rtcGetAlarm(void){
inline uint32_t rtcGetAlarm(void){
return rtc_lld_get_alarm();
}

7
testhal/STM32F1xx/RTC/halconf.h
View File

@ -212,6 +212,13 @@
#define RTC_SUPPORTS_CALLBACKS FALSE
#endif
/**
* @brief Clock source selecting. LSE by default.
*/
#if !defined(RTC_CLOCK_SOURCE) || defined(__DOXYGEN__)
#define RTC_CLOCK_SOURCE RCC_BDCR_RTCSEL_LSE
#endif
/*===========================================================================*/
/* MAC driver related settings. */
/*===========================================================================*/