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RTC. Setting and getting time works on STM32F4x 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/rtc_dev@3596 35acf78f-673a-0410-8e92-d51de3d6d3f4
This commit is contained in:
barthess 2011-12-11 20:05:55 +00:00
parent 4a5c4e2ae0
commit 9a52743e90
4 changed files with 60 additions and 31 deletions
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1
os/hal/platforms/STM32F4xx/hal_lld.h
View File

@ -320,6 +320,7 @@
/* RTC attributes.*/
#define STM32_HAS_RTC TRUE
#define RTC_HAS_SUBSECONDS TRUE
/* SDIO attributes.*/
#define STM32_HAS_SDIO TRUE

67
os/hal/platforms/STM32F4xx/rtc_lld.c
View File

@ -31,6 +31,24 @@
#if HAL_USE_RTC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Notes. */
/*===========================================================================*/
/*
This structure is used to hold the values representing a calendar time.
It contains the following members, with the meanings as shown.
int tm_sec // seconds after minute [0-61] (61 allows for 2 leap-seconds)
int tm_min // minutes after hour [0-59]
int tm_hour // hours after midnight [0-23]
int tm_mday // day of the month [1-31]
int tm_mon // month of year [0-11]
int tm_year // current year-1900
int tm_wday // days since Sunday [0-6]
int tm_yday // days since January 1st [0-365]
int tm_isdst // daylight savings indicator (1 = yes, 0 = no, -1 = unknown)
*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
@ -65,7 +83,11 @@ RTCDriver RTCD1;
* @notapi
*/
void rtc_lld_init(void){
uint32_t preload;
/* Asynchronous part of preloader. Set it to maximum value. */
#define PREDIV_A ((uint32_t)0x7F)
/* Add async part to preload value. */
uint32_t preload = PREDIV_A << 16;
/* Enables access to BKP registers.*/
PWR->CR |= PWR_CR_DBP;
@ -77,35 +99,35 @@ void rtc_lld_init(void){
}
#if STM32_RTC == STM32_RTC_LSE
#define RTC_CLK STM32_LSECLK
if (!(RCC->BDCR & RCC_BDCR_LSEON)) {
RCC->BDCR |= RCC_BDCR_LSEON;
while (!(RCC->BDCR & RCC_BDCR_LSERDY))
;
}
preload = STM32_LSECLK - 1;
#elif STM32_RTC == STM32_RTC_LSI
#define RTC_CLK STM32_LSICLK
/* TODO: Move the LSI clock initialization in the HAL low level driver.*/
RCC->CSR |= RCC_CSR_LSION;
while (!(RCC->CSR & RCC_CSR_LSIRDY))
;
/* According to errata sheet we must wait additional 100 uS for
stabilization.
TODO: Change this code, software loops are not reliable.*/
uint32_t tmo = (STM32_SYSCLK / 1000000) * 100;
while (tmo--)
;
preload = STM32_LSICLK - 1;
#elif STM32_RTC == STM32_RTC_HSE
preload = (STM32_HSICLK / 128) - 1;
#define RTC_CLK (STM32_HSICLK / 31)
#endif
/* Add sync part to preload value. */
preload |= ((RTC_CLK / (PREDIV_A + 1)) - 1) & 0x7FFF;
/* Selects clock source (previously enabled and stabilized).*/
RCC->BDCR = (RCC->BDCR & ~RCC_BDCR_RTCSEL) | STM32_RTC;
/* RTC enabled regardless its previous status.*/
RCC->BDCR |= RCC_BDCR_RTCEN;
if (!(RTC->ISR & RTC_ISR_INITS)){/* Calendar not init yet. */
/* If calendar not init yet. */
if (!(RTC->ISR & RTC_ISR_INITS)){
/* Disable write protection on RTC registers. */
RTC->WPR = 0xCA;
RTC->WPR = 0x53;
@ -115,13 +137,9 @@ void rtc_lld_init(void){
while(!(RTC->ISR & RTC_ISR_INITF))
;
/* Prescaler registers must be written in by two separate writes. */
RTC->PRER = 0x007F00FF;
RTC->PRER = 0x007F00FF;
RTC->PRER = preload;
RTC->PRER = preload;
RTC->ISR &= ~RTC_ISR_INIT;
/* Wait until calendar data will updated. */
while(!(RTC->ISR & RTC_ISR_RSF))
;
}
/* Callback initially disabled.*/
@ -147,10 +165,6 @@ void rtc_lld_set_time(RTCDriver *rtcp, const RTCTime *timespec) {
RTC->TR = timespec->tv_time;
RTC->DR = timespec->tv_date;
RTC->ISR &= ~RTC_ISR_INIT;
/* Wait until calendar data will updated. */
while(!(RTC->ISR & RTC_ISR_RSF))
;
}
/**
@ -168,13 +182,19 @@ void rtc_lld_get_time(RTCDriver *rtcp, RTCTime *timespec) {
* the frequency of RTCCLK, BYPSHAD must be set to ‘1’ .*/
/* Wait until calendar data will updated. */
while(!(RTC->ISR & RTC_ISR_RSF))
;
while(!(RTC->ISR & RTC_ISR_RSF))
;
timespec->tv_time = RTC->TR;
timespec->tv_date = RTC->DR;
#if RTC_HAS_SUBSECONDS
timespec->tv_msec = ((RTC->PRER & 0x7FFF) - RTC->SSR) / ((RTC->PRER & 0x7FFF) + 1);
#else
timespec->tv_msec = 0;
#endif /* STM32_RTC_HAS_SUBSECONDS */
}
/**
* @brief Set alarm time.
*
@ -189,7 +209,6 @@ void rtc_lld_get_time(RTCDriver *rtcp, RTCTime *timespec) {
void rtc_lld_set_alarm(RTCDriver *rtcp,
rtcalarm_t alarm,
const RTCAlarm *alarmspec) {
(void)rtcp;
(void)alarm;
(void)alarmspec;

17
os/hal/platforms/STM32F4xx/rtc_lld.h
View File

@ -41,7 +41,7 @@
#define RTC_SUPPORTS_CALLBACKS TRUE
/**
* @brief One alarm comparator available.
* @brief Two alarm comparators available on STM32F4x.
*/
#define RTC_ALARMS 2
@ -62,6 +62,10 @@
#error "invalid source selected for RTC clock"
#endif
#if RTC_SUPPORTS_CALLBACKS && !(HAL_USE_EXT)
#error "interrupts from STM32 RTC works only through EXTI"
#endif
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
@ -97,13 +101,18 @@ typedef void (*rtccb_t)(RTCDriver *rtcp, rtcevent_t event);
*/
struct RTCTime {
/**
* @brief RTC date register in BCD format.
* @brief RTC date register in STM32 BCD format.
*/
uint32_t tv_date;
/**
* @brief RTC time register in BCD format.
* @brief RTC time register in STM32 BCD format.
*/
uint32_t tv_time;
/**
* @brief Fractional part of time.
* @note If platform does not support subseconds than always zero.
*/
uint16_t tv_msec;
};
@ -112,7 +121,7 @@ struct RTCTime {
*/
struct RTCAlarm {
/**
* @brief Date and time of alarm in BCD.
* @brief Date and time of alarm in STM32 BCD.
*/
uint32_t tv_datetime;
};

6
testhal/STM32F1xx/RTC/main.c
View File

@ -24,7 +24,7 @@
RTCTime timespec;
RTCAlarm alarmspec;
#define TEST_ALARM_WAKEUP FALSE
#define TEST_ALARM_WAKEUP TRUE
#if TEST_ALARM_WAKEUP
@ -45,9 +45,9 @@ int main(void) {
chThdCreateStatic(blinkWA, sizeof(blinkWA), NORMALPRIO, blink_thd, NULL);
/* set alarm in near future */
rtcGetTime(&timespec);
rtcGetTime(&RTCD1, &timespec);
alarmspec.tv_sec = timespec.tv_sec + 60;
rtcSetAlarm(&alarmspec);
rtcSetAlarm(&RTCD1, 0, &alarmspec);
while (TRUE){
chThdSleepSeconds(10);