mirror of https://github.com/ARMmbed/mbed-os.git
[NUC472/M453/M487/NANO130] Rework RTC
The rework includes the following: 1. Support year range beyond H/W RTC 2000~2099. 2. Refine RTC register access with low-power clock sourcepull/6049/head
ccli8
parent
f0273ecb28
commit
0271df1fa5
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@ -13,7 +13,7 @@
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "rtc_api.h"
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#if DEVICE_RTC
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@ -24,8 +24,65 @@
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#include "nu_miscutil.h"
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#include "mbed_mktime.h"
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#define YEAR0 1900
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//#define EPOCH_YR 1970
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/* Micro seconds per second */
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#define NU_US_PER_SEC 1000000
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/* Timer clock per second
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*
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* NOTE: This dependents on real hardware.
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*/
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#define NU_RTCCLK_PER_SEC ((CLK->CLKSEL3 & CLK_CLKSEL3_SC0SEL_Msk) ? __LIRC : __LXT)
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/* Strategy for implementation of RTC HAL
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*
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* H/W RTC just supports year range 2000~2099, which cannot fully cover POSIX time (starting since 2970)
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* and date time of struct TM (starting since 1900).
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*
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* To conquer the difficulty, we don't use H/W RTC to keep real date time. Instead, we use it to keep
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* elapsed time in seconds since one reference time point. The strategy would be:
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*
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* 1. Choose DATETIME_HWRTC_ORIGIN (00:00:00 UTC, Saturday, 1 January 2000) as reference time point of H/W RTC.
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* 2. t_hwrtc_origin = DATETIME_HWRTC_ORIGIN in POSIX time
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* 3. t_hwrtc_elapsed = t_hwrtc_origin + elapsed time since t_hwrtc_origin
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* 4. t_write = POSIX time set by rtc_write().
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* 5. t_present = rtc_read() = t_write + (t_hwrtc_elapsed - t_hwrtc_origin)
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*
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* 1900
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* |---------------------------------------------------------------------------------|
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* 1970 t_write t_present
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* |---------|-------|-----------------|---------------------------------------------|
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*
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* 2000
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* |-----------------|---------------------------------------------------------------|
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* t_hwrtc_origin t_hwrtc_elapsed
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*
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*/
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/* Start year of struct TM*/
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#define NU_TM_YEAR0 1900
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/* Start year of POSIX time (set_time()/time()) */
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#define NU_POSIX_YEAR0 1970
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/* Start year of H/W RTC */
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#define NU_HWRTC_YEAR0 2000
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/* RTC H/W origin time: 00:00:00 UTC, Saturday, 1 January 2000 */
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static const S_RTC_TIME_DATA_T DATETIME_HWRTC_ORIGIN = {
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2000, /* Year value, range between 2000 ~ 2099 */
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1, /* Month value, range between 1 ~ 12 */
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1, /* Day value, range between 1 ~ 31 */
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RTC_SATURDAY, /* Day of the week */
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0, /* Hour value, range between 0 ~ 23 */
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0, /* Minute value, range between 0 ~ 59 */
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0, /* Second value, range between 0 ~ 59 */
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RTC_CLOCK_24, /* 12-Hour (RTC_CLOCK_12) / 24-Hour (RTC_CLOCK_24) */
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0 /* RTC_AM / RTC_PM (used only for 12-Hour) */
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};
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/* t_hwrtc_origin initialized or not? */
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static bool t_hwrtc_origin_inited = 0;
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/* POSIX time of DATETIME_HWRTC_ORIGIN (since 00:00:00 UTC, Thursday, 1 January 1970) */
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static time_t t_hwrtc_origin = 0;
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/* POSIX time set by rtc_write() */
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static time_t t_write = 0;
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/* Convert date time from H/W RTC to struct TM */
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static void rtc_convert_datetime_hwrtc_to_tm(struct tm *datetime_tm, const S_RTC_TIME_DATA_T *datetime_hwrtc);
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static const struct nu_modinit_s rtc_modinit = {RTC_0, RTC_MODULE, 0, 0, 0, RTC_IRQn, NULL};
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@ -34,8 +91,11 @@ void rtc_init(void)
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if (rtc_isenabled()) {
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return;
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}
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RTC_Open(NULL);
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/* POSIX time origin (00:00:00 UTC, Thursday, 1 January 1970) */
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rtc_write(0);
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}
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void rtc_free(void)
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@ -50,11 +110,62 @@ int rtc_isenabled(void)
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// Enable IP clock
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CLK_EnableModuleClock(rtc_modinit.clkidx);
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}
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// NOTE: Check RTC Init Active flag to support crossing reset cycle.
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return !! (RTC->INIT & RTC_INIT_ACTIVE_Msk);
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}
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time_t rtc_read(void)
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{
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/* NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency.
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* RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect.
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*/
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if (! rtc_isenabled()) {
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rtc_init();
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}
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/* Used for intermediary between date time of H/W RTC and POSIX time */
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struct tm datetime_tm;
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if (! t_hwrtc_origin_inited) {
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t_hwrtc_origin_inited = 1;
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/* Convert date time from H/W RTC to struct TM */
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rtc_convert_datetime_hwrtc_to_tm(&datetime_tm, &DATETIME_HWRTC_ORIGIN);
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/* Convert date time of struct TM to POSIX time */
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if (! _rtc_maketime(&datetime_tm, &t_hwrtc_origin, RTC_FULL_LEAP_YEAR_SUPPORT)) {
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return 0;
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}
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}
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S_RTC_TIME_DATA_T hwrtc_datetime_2K_present;
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RTC_GetDateAndTime(&hwrtc_datetime_2K_present);
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/* Convert date time from H/W RTC to struct TM */
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rtc_convert_datetime_hwrtc_to_tm(&datetime_tm, &hwrtc_datetime_2K_present);
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/* Convert date time of struct TM to POSIX time */
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time_t t_hwrtc_elapsed;
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if (! _rtc_maketime(&datetime_tm, &t_hwrtc_elapsed, RTC_FULL_LEAP_YEAR_SUPPORT)) {
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return 0;
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}
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/* Present time in POSIX time */
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time_t t_present = t_write + (t_hwrtc_elapsed - t_hwrtc_origin);
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return t_present;
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}
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void rtc_write(time_t t)
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{
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if (! rtc_isenabled()) {
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rtc_init();
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}
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t_write = t;
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RTC_SetDateAndTime((S_RTC_TIME_DATA_T *) &DATETIME_HWRTC_ORIGIN);
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/* NOTE: When engine is clocked by low power clock source (LXT/LIRC), we need to wait for 3 engine clocks. */
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wait_us((NU_US_PER_SEC / NU_RTCCLK_PER_SEC) * 3);
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}
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/*
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struct tm
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tm_sec seconds after the minute 0-61
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@ -67,69 +178,18 @@ int rtc_isenabled(void)
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tm_yday days since January 1 0-365
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tm_isdst Daylight Saving Time flag
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*/
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time_t rtc_read(void)
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static void rtc_convert_datetime_hwrtc_to_tm(struct tm *datetime_tm, const S_RTC_TIME_DATA_T *datetime_hwrtc)
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{
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// NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency.
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// RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect.
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if (! rtc_isenabled()) {
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rtc_init();
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datetime_tm->tm_year = datetime_hwrtc->u32Year - NU_TM_YEAR0;
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datetime_tm->tm_mon = datetime_hwrtc->u32Month - 1;
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datetime_tm->tm_mday = datetime_hwrtc->u32Day;
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datetime_tm->tm_wday = datetime_hwrtc->u32DayOfWeek;
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datetime_tm->tm_hour = datetime_hwrtc->u32Hour;
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if (datetime_hwrtc->u32TimeScale == RTC_CLOCK_12 && datetime_hwrtc->u32AmPm == RTC_PM) {
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datetime_tm->tm_hour += 12;
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}
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S_RTC_TIME_DATA_T rtc_datetime;
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RTC_GetDateAndTime(&rtc_datetime);
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struct tm timeinfo;
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// Convert struct tm to S_RTC_TIME_DATA_T
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timeinfo.tm_year = rtc_datetime.u32Year - YEAR0;
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timeinfo.tm_mon = rtc_datetime.u32Month - 1;
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timeinfo.tm_mday = rtc_datetime.u32Day;
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timeinfo.tm_wday = rtc_datetime.u32DayOfWeek;
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timeinfo.tm_hour = rtc_datetime.u32Hour;
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if (rtc_datetime.u32TimeScale == RTC_CLOCK_12 && rtc_datetime.u32AmPm == RTC_PM) {
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timeinfo.tm_hour += 12;
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}
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timeinfo.tm_min = rtc_datetime.u32Minute;
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timeinfo.tm_sec = rtc_datetime.u32Second;
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// Convert to timestamp
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time_t t;
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if (_rtc_maketime(&timeinfo, &t, RTC_FULL_LEAP_YEAR_SUPPORT) == false) {
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return 0;
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}
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return t;
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}
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void rtc_write(time_t t)
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{
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if (! rtc_isenabled()) {
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rtc_init();
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}
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// Convert timestamp to struct tm
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struct tm timeinfo;
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if (_rtc_localtime(t, &timeinfo, RTC_FULL_LEAP_YEAR_SUPPORT) == false) {
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return;
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}
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S_RTC_TIME_DATA_T rtc_datetime;
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// Convert S_RTC_TIME_DATA_T to struct tm
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rtc_datetime.u32Year = timeinfo.tm_year + YEAR0;
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rtc_datetime.u32Month = timeinfo.tm_mon + 1;
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rtc_datetime.u32Day = timeinfo.tm_mday;
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rtc_datetime.u32DayOfWeek = timeinfo.tm_wday;
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rtc_datetime.u32Hour = timeinfo.tm_hour;
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rtc_datetime.u32Minute = timeinfo.tm_min;
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rtc_datetime.u32Second = timeinfo.tm_sec;
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rtc_datetime.u32TimeScale = RTC_CLOCK_24;
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// NOTE: Timing issue with write to RTC registers. This delay is empirical, not rational.
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RTC_SetDateAndTime(&rtc_datetime);
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//nu_nop(6000);
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wait_us(100);
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datetime_tm->tm_min = datetime_hwrtc->u32Minute;
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datetime_tm->tm_sec = datetime_hwrtc->u32Second;
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}
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#endif
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@ -24,8 +24,65 @@
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#include "nu_miscutil.h"
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#include "mbed_mktime.h"
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#define YEAR0 1900
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//#define EPOCH_YR 1970
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/* Micro seconds per second */
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#define NU_US_PER_SEC 1000000
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/* Timer clock per second
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*
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* NOTE: This dependents on real hardware.
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*/
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#define NU_RTCCLK_PER_SEC ((CLK->CLKSEL3 & CLK_CLKSEL3_SC0SEL_Msk) ? __LIRC : __LXT)
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/* Strategy for implementation of RTC HAL
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*
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* H/W RTC just supports year range 2000~2099, which cannot fully cover POSIX time (starting since 2970)
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* and date time of struct TM (starting since 1900).
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*
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* To conquer the difficulty, we don't use H/W RTC to keep real date time. Instead, we use it to keep
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* elapsed time in seconds since one reference time point. The strategy would be:
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*
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* 1. Choose DATETIME_HWRTC_ORIGIN (00:00:00 UTC, Saturday, 1 January 2000) as reference time point of H/W RTC.
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* 2. t_hwrtc_origin = DATETIME_HWRTC_ORIGIN in POSIX time
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* 3. t_hwrtc_elapsed = t_hwrtc_origin + elapsed time since t_hwrtc_origin
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* 4. t_write = POSIX time set by rtc_write().
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* 5. t_present = rtc_read() = t_write + (t_hwrtc_elapsed - t_hwrtc_origin)
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*
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* 1900
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* |---------------------------------------------------------------------------------|
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* 1970 t_write t_present
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* |---------|-------|-----------------|---------------------------------------------|
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*
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* 2000
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* |-----------------|---------------------------------------------------------------|
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* t_hwrtc_origin t_hwrtc_elapsed
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*
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*/
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/* Start year of struct TM*/
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#define NU_TM_YEAR0 1900
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/* Start year of POSIX time (set_time()/time()) */
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#define NU_POSIX_YEAR0 1970
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/* Start year of H/W RTC */
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#define NU_HWRTC_YEAR0 2000
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/* RTC H/W origin time: 00:00:00 UTC, Saturday, 1 January 2000 */
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static const S_RTC_TIME_DATA_T DATETIME_HWRTC_ORIGIN = {
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2000, /* Year value, range between 2000 ~ 2099 */
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1, /* Month value, range between 1 ~ 12 */
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1, /* Day value, range between 1 ~ 31 */
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RTC_SATURDAY, /* Day of the week */
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0, /* Hour value, range between 0 ~ 23 */
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0, /* Minute value, range between 0 ~ 59 */
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0, /* Second value, range between 0 ~ 59 */
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RTC_CLOCK_24, /* 12-Hour (RTC_CLOCK_12) / 24-Hour (RTC_CLOCK_24) */
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0 /* RTC_AM / RTC_PM (used only for 12-Hour) */
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};
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/* t_hwrtc_origin initialized or not? */
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static bool t_hwrtc_origin_inited = 0;
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/* POSIX time of DATETIME_HWRTC_ORIGIN (since 00:00:00 UTC, Thursday, 1 January 1970) */
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static time_t t_hwrtc_origin = 0;
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/* POSIX time set by rtc_write() */
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static time_t t_write = 0;
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/* Convert date time from H/W RTC to struct TM */
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static void rtc_convert_datetime_hwrtc_to_tm(struct tm *datetime_tm, const S_RTC_TIME_DATA_T *datetime_hwrtc);
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static const struct nu_modinit_s rtc_modinit = {RTC_0, RTC_MODULE, 0, 0, 0, RTC_IRQn, NULL};
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@ -36,6 +93,9 @@ void rtc_init(void)
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}
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RTC_Open(NULL);
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/* POSIX time origin (00:00:00 UTC, Thursday, 1 January 1970) */
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rtc_write(0);
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}
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void rtc_free(void)
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@ -54,6 +114,58 @@ int rtc_isenabled(void)
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// NOTE: Check RTC Init Active flag to support crossing reset cycle.
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return !! (RTC->INIT & RTC_INIT_ACTIVE_Msk);
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}
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time_t rtc_read(void)
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{
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/* NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency.
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* RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect.
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* NUC472/M453: Known issue
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* M487: Fixed
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*/
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if (! rtc_isenabled()) {
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rtc_init();
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}
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/* Used for intermediary between date time of H/W RTC and POSIX time */
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struct tm datetime_tm;
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if (! t_hwrtc_origin_inited) {
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t_hwrtc_origin_inited = 1;
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/* Convert date time from H/W RTC to struct TM */
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rtc_convert_datetime_hwrtc_to_tm(&datetime_tm, &DATETIME_HWRTC_ORIGIN);
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/* Convert date time of struct TM to POSIX time */
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if (! _rtc_maketime(&datetime_tm, &t_hwrtc_origin, RTC_FULL_LEAP_YEAR_SUPPORT)) {
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return 0;
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}
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}
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S_RTC_TIME_DATA_T hwrtc_datetime_2K_present;
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RTC_GetDateAndTime(&hwrtc_datetime_2K_present);
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/* Convert date time from H/W RTC to struct TM */
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rtc_convert_datetime_hwrtc_to_tm(&datetime_tm, &hwrtc_datetime_2K_present);
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/* Convert date time of struct TM to POSIX time */
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time_t t_hwrtc_elapsed;
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if (! _rtc_maketime(&datetime_tm, &t_hwrtc_elapsed, RTC_FULL_LEAP_YEAR_SUPPORT)) {
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return 0;
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}
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/* Present time in POSIX time */
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time_t t_present = t_write + (t_hwrtc_elapsed - t_hwrtc_origin);
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return t_present;
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}
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void rtc_write(time_t t)
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{
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if (! rtc_isenabled()) {
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rtc_init();
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}
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t_write = t;
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RTC_SetDateAndTime((S_RTC_TIME_DATA_T *) &DATETIME_HWRTC_ORIGIN);
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/* NOTE: When engine is clocked by low power clock source (LXT/LIRC), we need to wait for 3 engine clocks. */
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wait_us((NU_US_PER_SEC / NU_RTCCLK_PER_SEC) * 3);
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}
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/*
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struct tm
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@ -67,70 +179,18 @@ int rtc_isenabled(void)
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tm_yday days since January 1 0-365
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tm_isdst Daylight Saving Time flag
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*/
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time_t rtc_read(void)
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static void rtc_convert_datetime_hwrtc_to_tm(struct tm *datetime_tm, const S_RTC_TIME_DATA_T *datetime_hwrtc)
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{
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// NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency.
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// RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect.
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// NUC472/M453: Known issue
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// M487: Fixed
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if (! rtc_isenabled()) {
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rtc_init();
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datetime_tm->tm_year = datetime_hwrtc->u32Year - NU_TM_YEAR0;
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datetime_tm->tm_mon = datetime_hwrtc->u32Month - 1;
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datetime_tm->tm_mday = datetime_hwrtc->u32Day;
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datetime_tm->tm_wday = datetime_hwrtc->u32DayOfWeek;
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datetime_tm->tm_hour = datetime_hwrtc->u32Hour;
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if (datetime_hwrtc->u32TimeScale == RTC_CLOCK_12 && datetime_hwrtc->u32AmPm == RTC_PM) {
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datetime_tm->tm_hour += 12;
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}
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S_RTC_TIME_DATA_T rtc_datetime;
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RTC_GetDateAndTime(&rtc_datetime);
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struct tm timeinfo;
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// Convert struct tm to S_RTC_TIME_DATA_T
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timeinfo.tm_year = rtc_datetime.u32Year - YEAR0;
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timeinfo.tm_mon = rtc_datetime.u32Month - 1;
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timeinfo.tm_mday = rtc_datetime.u32Day;
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timeinfo.tm_wday = rtc_datetime.u32DayOfWeek;
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timeinfo.tm_hour = rtc_datetime.u32Hour;
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if (rtc_datetime.u32TimeScale == RTC_CLOCK_12 && rtc_datetime.u32AmPm == RTC_PM) {
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timeinfo.tm_hour += 12;
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}
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timeinfo.tm_min = rtc_datetime.u32Minute;
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timeinfo.tm_sec = rtc_datetime.u32Second;
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// Convert to timestamp
|
||||
time_t t;
|
||||
if (_rtc_maketime(&timeinfo, &t, RTC_FULL_LEAP_YEAR_SUPPORT) == false) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
return t;
|
||||
}
|
||||
|
||||
void rtc_write(time_t t)
|
||||
{
|
||||
if (! rtc_isenabled()) {
|
||||
rtc_init();
|
||||
}
|
||||
|
||||
// Convert timestamp to struct tm
|
||||
struct tm timeinfo;
|
||||
if (_rtc_localtime(t, &timeinfo, RTC_FULL_LEAP_YEAR_SUPPORT) == false) {
|
||||
return;
|
||||
}
|
||||
|
||||
S_RTC_TIME_DATA_T rtc_datetime;
|
||||
|
||||
// Convert S_RTC_TIME_DATA_T to struct tm
|
||||
rtc_datetime.u32Year = timeinfo.tm_year + YEAR0;
|
||||
rtc_datetime.u32Month = timeinfo.tm_mon + 1;
|
||||
rtc_datetime.u32Day = timeinfo.tm_mday;
|
||||
rtc_datetime.u32DayOfWeek = timeinfo.tm_wday;
|
||||
rtc_datetime.u32Hour = timeinfo.tm_hour;
|
||||
rtc_datetime.u32Minute = timeinfo.tm_min;
|
||||
rtc_datetime.u32Second = timeinfo.tm_sec;
|
||||
rtc_datetime.u32TimeScale = RTC_CLOCK_24;
|
||||
|
||||
// NOTE: Timing issue with write to RTC registers. This delay is empirical, not rational.
|
||||
RTC_SetDateAndTime(&rtc_datetime);
|
||||
wait_us(100);
|
||||
datetime_tm->tm_min = datetime_hwrtc->u32Minute;
|
||||
datetime_tm->tm_sec = datetime_hwrtc->u32Second;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -13,7 +13,7 @@
|
|||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
|
||||
#include "rtc_api.h"
|
||||
|
||||
#if DEVICE_RTC
|
||||
|
|
@ -24,8 +24,65 @@
|
|||
#include "nu_miscutil.h"
|
||||
#include "mbed_mktime.h"
|
||||
|
||||
#define YEAR0 1900
|
||||
/* Micro seconds per second */
|
||||
#define NU_US_PER_SEC 1000000
|
||||
/* Timer clock per second
|
||||
*
|
||||
* NOTE: This dependents on real hardware.
|
||||
*/
|
||||
#define NU_RTCCLK_PER_SEC (__LXT)
|
||||
|
||||
/* Strategy for implementation of RTC HAL
|
||||
*
|
||||
* H/W RTC just supports year range 2000~2099, which cannot fully cover POSIX time (starting since 2970)
|
||||
* and date time of struct TM (starting since 1900).
|
||||
*
|
||||
* To conquer the difficulty, we don't use H/W RTC to keep real date time. Instead, we use it to keep
|
||||
* elapsed time in seconds since one reference time point. The strategy would be:
|
||||
*
|
||||
* 1. Choose DATETIME_HWRTC_ORIGIN (00:00:00 UTC, Saturday, 1 January 2000) as reference time point of H/W RTC.
|
||||
* 2. t_hwrtc_origin = DATETIME_HWRTC_ORIGIN in POSIX time
|
||||
* 3. t_hwrtc_elapsed = t_hwrtc_origin + elapsed time since t_hwrtc_origin
|
||||
* 4. t_write = POSIX time set by rtc_write().
|
||||
* 5. t_present = rtc_read() = t_write + (t_hwrtc_elapsed - t_hwrtc_origin)
|
||||
*
|
||||
* 1900
|
||||
* |---------------------------------------------------------------------------------|
|
||||
* 1970 t_write t_present
|
||||
* |---------|-------|-----------------|---------------------------------------------|
|
||||
*
|
||||
* 2000
|
||||
* |-----------------|---------------------------------------------------------------|
|
||||
* t_hwrtc_origin t_hwrtc_elapsed
|
||||
*
|
||||
*/
|
||||
/* Start year of struct TM*/
|
||||
#define NU_TM_YEAR0 1900
|
||||
/* Start year of POSIX time (set_time()/time()) */
|
||||
#define NU_POSIX_YEAR0 1970
|
||||
/* Start year of H/W RTC */
|
||||
#define NU_HWRTC_YEAR0 2000
|
||||
|
||||
/* RTC H/W origin time: 00:00:00 UTC, Saturday, 1 January 2000 */
|
||||
static const S_RTC_TIME_DATA_T DATETIME_HWRTC_ORIGIN = {
|
||||
2000, /* Year value, range between 2000 ~ 2099 */
|
||||
1, /* Month value, range between 1 ~ 12 */
|
||||
1, /* Day value, range between 1 ~ 31 */
|
||||
RTC_SATURDAY, /* Day of the week */
|
||||
0, /* Hour value, range between 0 ~ 23 */
|
||||
0, /* Minute value, range between 0 ~ 59 */
|
||||
0, /* Second value, range between 0 ~ 59 */
|
||||
RTC_CLOCK_24, /* 12-Hour (RTC_CLOCK_12) / 24-Hour (RTC_CLOCK_24) */
|
||||
0 /* RTC_AM / RTC_PM (used only for 12-Hour) */
|
||||
};
|
||||
/* t_hwrtc_origin initialized or not? */
|
||||
static bool t_hwrtc_origin_inited = 0;
|
||||
/* POSIX time of DATETIME_HWRTC_ORIGIN (since 00:00:00 UTC, Thursday, 1 January 1970) */
|
||||
static time_t t_hwrtc_origin = 0;
|
||||
/* POSIX time set by rtc_write() */
|
||||
static time_t t_write = 0;
|
||||
/* Convert date time from H/W RTC to struct TM */
|
||||
static void rtc_convert_datetime_hwrtc_to_tm(struct tm *datetime_tm, const S_RTC_TIME_DATA_T *datetime_hwrtc);
|
||||
|
||||
static const struct nu_modinit_s rtc_modinit = {RTC_0, RTC_MODULE, 0, 0, 0, RTC_IRQn, NULL};
|
||||
|
||||
|
|
@ -34,8 +91,11 @@ void rtc_init(void)
|
|||
if (rtc_isenabled()) {
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
RTC_Open(NULL);
|
||||
|
||||
/* POSIX time origin (00:00:00 UTC, Thursday, 1 January 1970) */
|
||||
rtc_write(0);
|
||||
}
|
||||
|
||||
void rtc_free(void)
|
||||
|
|
@ -50,11 +110,62 @@ int rtc_isenabled(void)
|
|||
// Enable IP clock
|
||||
CLK_EnableModuleClock(rtc_modinit.clkidx);
|
||||
}
|
||||
|
||||
|
||||
// NOTE: Check RTC Init Active flag to support crossing reset cycle.
|
||||
return !! (RTC->INIR & RTC_INIR_ACTIVE_Msk);
|
||||
}
|
||||
|
||||
time_t rtc_read(void)
|
||||
{
|
||||
/* NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency.
|
||||
* RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect.
|
||||
*/
|
||||
if (! rtc_isenabled()) {
|
||||
rtc_init();
|
||||
}
|
||||
|
||||
/* Used for intermediary between date time of H/W RTC and POSIX time */
|
||||
struct tm datetime_tm;
|
||||
|
||||
if (! t_hwrtc_origin_inited) {
|
||||
t_hwrtc_origin_inited = 1;
|
||||
|
||||
/* Convert date time from H/W RTC to struct TM */
|
||||
rtc_convert_datetime_hwrtc_to_tm(&datetime_tm, &DATETIME_HWRTC_ORIGIN);
|
||||
/* Convert date time of struct TM to POSIX time */
|
||||
if (! _rtc_maketime(&datetime_tm, &t_hwrtc_origin, RTC_FULL_LEAP_YEAR_SUPPORT)) {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
S_RTC_TIME_DATA_T hwrtc_datetime_2K_present;
|
||||
RTC_GetDateAndTime(&hwrtc_datetime_2K_present);
|
||||
/* Convert date time from H/W RTC to struct TM */
|
||||
rtc_convert_datetime_hwrtc_to_tm(&datetime_tm, &hwrtc_datetime_2K_present);
|
||||
/* Convert date time of struct TM to POSIX time */
|
||||
time_t t_hwrtc_elapsed;
|
||||
if (! _rtc_maketime(&datetime_tm, &t_hwrtc_elapsed, RTC_FULL_LEAP_YEAR_SUPPORT)) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Present time in POSIX time */
|
||||
time_t t_present = t_write + (t_hwrtc_elapsed - t_hwrtc_origin);
|
||||
return t_present;
|
||||
}
|
||||
|
||||
void rtc_write(time_t t)
|
||||
{
|
||||
if (! rtc_isenabled()) {
|
||||
rtc_init();
|
||||
}
|
||||
|
||||
t_write = t;
|
||||
|
||||
RTC_SetDateAndTime((S_RTC_TIME_DATA_T *) &DATETIME_HWRTC_ORIGIN);
|
||||
/* NOTE: When engine is clocked by low power clock source (LXT/LIRC), we need to wait for 3 engine clocks. */
|
||||
wait_us((NU_US_PER_SEC / NU_RTCCLK_PER_SEC) * 3);
|
||||
}
|
||||
|
||||
/*
|
||||
struct tm
|
||||
tm_sec seconds after the minute 0-61
|
||||
|
|
@ -67,68 +178,19 @@ int rtc_isenabled(void)
|
|||
tm_yday days since January 1 0-365
|
||||
tm_isdst Daylight Saving Time flag
|
||||
*/
|
||||
|
||||
time_t rtc_read(void)
|
||||
static void rtc_convert_datetime_hwrtc_to_tm(struct tm *datetime_tm, const S_RTC_TIME_DATA_T *datetime_hwrtc)
|
||||
{
|
||||
// NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency.
|
||||
// RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect.
|
||||
if (! rtc_isenabled()) {
|
||||
rtc_init();
|
||||
datetime_tm->tm_year = datetime_hwrtc->u32Year - NU_TM_YEAR0;
|
||||
datetime_tm->tm_mon = datetime_hwrtc->u32Month - 1;
|
||||
datetime_tm->tm_mday = datetime_hwrtc->u32Day;
|
||||
datetime_tm->tm_wday = datetime_hwrtc->u32DayOfWeek;
|
||||
datetime_tm->tm_hour = datetime_hwrtc->u32Hour;
|
||||
if (datetime_hwrtc->u32TimeScale == RTC_CLOCK_12 && datetime_hwrtc->u32AmPm == RTC_PM) {
|
||||
datetime_tm->tm_hour += 12;
|
||||
}
|
||||
|
||||
S_RTC_TIME_DATA_T rtc_datetime;
|
||||
RTC_GetDateAndTime(&rtc_datetime);
|
||||
|
||||
struct tm timeinfo;
|
||||
|
||||
// Convert struct tm to S_RTC_TIME_DATA_T
|
||||
timeinfo.tm_year = rtc_datetime.u32Year - YEAR0;
|
||||
timeinfo.tm_mon = rtc_datetime.u32Month - 1;
|
||||
timeinfo.tm_mday = rtc_datetime.u32Day;
|
||||
timeinfo.tm_wday = rtc_datetime.u32DayOfWeek;
|
||||
timeinfo.tm_hour = rtc_datetime.u32Hour;
|
||||
if (rtc_datetime.u32TimeScale == RTC_CLOCK_12 && rtc_datetime.u32AmPm == RTC_PM) {
|
||||
timeinfo.tm_hour += 12;
|
||||
}
|
||||
timeinfo.tm_min = rtc_datetime.u32Minute;
|
||||
timeinfo.tm_sec = rtc_datetime.u32Second;
|
||||
|
||||
// Convert to timestamp
|
||||
time_t t;
|
||||
if (_rtc_maketime(&timeinfo, &t, RTC_FULL_LEAP_YEAR_SUPPORT) == false) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
return t;
|
||||
}
|
||||
|
||||
void rtc_write(time_t t)
|
||||
{
|
||||
if (! rtc_isenabled()) {
|
||||
rtc_init();
|
||||
}
|
||||
|
||||
// Convert timestamp to struct tm
|
||||
struct tm timeinfo;
|
||||
if (_rtc_localtime(t, &timeinfo, RTC_FULL_LEAP_YEAR_SUPPORT) == false) {
|
||||
return;
|
||||
}
|
||||
|
||||
S_RTC_TIME_DATA_T rtc_datetime;
|
||||
|
||||
// Convert S_RTC_TIME_DATA_T to struct tm
|
||||
rtc_datetime.u32Year = timeinfo.tm_year + YEAR0;
|
||||
rtc_datetime.u32Month = timeinfo.tm_mon + 1;
|
||||
rtc_datetime.u32Day = timeinfo.tm_mday;
|
||||
rtc_datetime.u32DayOfWeek = timeinfo.tm_wday;
|
||||
rtc_datetime.u32Hour = timeinfo.tm_hour;
|
||||
rtc_datetime.u32Minute = timeinfo.tm_min;
|
||||
rtc_datetime.u32Second = timeinfo.tm_sec;
|
||||
rtc_datetime.u32TimeScale = RTC_CLOCK_24;
|
||||
|
||||
RTC_SetDateAndTime(&rtc_datetime);
|
||||
// Wait 3 cycles of engine clock to ensure previous CTL write action is finish
|
||||
wait_us(30 * 3);
|
||||
datetime_tm->tm_min = datetime_hwrtc->u32Minute;
|
||||
datetime_tm->tm_sec = datetime_hwrtc->u32Second;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
|
|
|
|||
|
|
@ -13,7 +13,7 @@
|
|||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
|
||||
#include "rtc_api.h"
|
||||
|
||||
#if DEVICE_RTC
|
||||
|
|
@ -24,8 +24,65 @@
|
|||
#include "nu_miscutil.h"
|
||||
#include "mbed_mktime.h"
|
||||
|
||||
#define YEAR0 1900
|
||||
//#define EPOCH_YR 1970
|
||||
/* Micro seconds per second */
|
||||
#define NU_US_PER_SEC 1000000
|
||||
/* Timer clock per second
|
||||
*
|
||||
* NOTE: This dependents on real hardware.
|
||||
*/
|
||||
#define NU_RTCCLK_PER_SEC (__LXT)
|
||||
|
||||
/* Strategy for implementation of RTC HAL
|
||||
*
|
||||
* H/W RTC just supports year range 2000~2099, which cannot fully cover POSIX time (starting since 2970)
|
||||
* and date time of struct TM (starting since 1900).
|
||||
*
|
||||
* To conquer the difficulty, we don't use H/W RTC to keep real date time. Instead, we use it to keep
|
||||
* elapsed time in seconds since one reference time point. The strategy would be:
|
||||
*
|
||||
* 1. Choose DATETIME_HWRTC_ORIGIN (00:00:00 UTC, Saturday, 1 January 2000) as reference time point of H/W RTC.
|
||||
* 2. t_hwrtc_origin = DATETIME_HWRTC_ORIGIN in POSIX time
|
||||
* 3. t_hwrtc_elapsed = t_hwrtc_origin + elapsed time since t_hwrtc_origin
|
||||
* 4. t_write = POSIX time set by rtc_write().
|
||||
* 5. t_present = rtc_read() = t_write + (t_hwrtc_elapsed - t_hwrtc_origin)
|
||||
*
|
||||
* 1900
|
||||
* |---------------------------------------------------------------------------------|
|
||||
* 1970 t_write t_present
|
||||
* |---------|-------|-----------------|---------------------------------------------|
|
||||
*
|
||||
* 2000
|
||||
* |-----------------|---------------------------------------------------------------|
|
||||
* t_hwrtc_origin t_hwrtc_elapsed
|
||||
*
|
||||
*/
|
||||
/* Start year of struct TM*/
|
||||
#define NU_TM_YEAR0 1900
|
||||
/* Start year of POSIX time (set_time()/time()) */
|
||||
#define NU_POSIX_YEAR0 1970
|
||||
/* Start year of H/W RTC */
|
||||
#define NU_HWRTC_YEAR0 2000
|
||||
|
||||
/* RTC H/W origin time: 00:00:00 UTC, Saturday, 1 January 2000 */
|
||||
static const S_RTC_TIME_DATA_T DATETIME_HWRTC_ORIGIN = {
|
||||
2000, /* Year value, range between 2000 ~ 2099 */
|
||||
1, /* Month value, range between 1 ~ 12 */
|
||||
1, /* Day value, range between 1 ~ 31 */
|
||||
RTC_SATURDAY, /* Day of the week */
|
||||
0, /* Hour value, range between 0 ~ 23 */
|
||||
0, /* Minute value, range between 0 ~ 59 */
|
||||
0, /* Second value, range between 0 ~ 59 */
|
||||
RTC_CLOCK_24, /* 12-Hour (RTC_CLOCK_12) / 24-Hour (RTC_CLOCK_24) */
|
||||
0 /* RTC_AM / RTC_PM (used only for 12-Hour) */
|
||||
};
|
||||
/* t_hwrtc_origin initialized or not? */
|
||||
static bool t_hwrtc_origin_inited = 0;
|
||||
/* POSIX time of DATETIME_HWRTC_ORIGIN (since 00:00:00 UTC, Thursday, 1 January 1970) */
|
||||
static time_t t_hwrtc_origin = 0;
|
||||
/* POSIX time set by rtc_write() */
|
||||
static time_t t_write = 0;
|
||||
/* Convert date time from H/W RTC to struct TM */
|
||||
static void rtc_convert_datetime_hwrtc_to_tm(struct tm *datetime_tm, const S_RTC_TIME_DATA_T *datetime_hwrtc);
|
||||
|
||||
static const struct nu_modinit_s rtc_modinit = {RTC_0, RTC_MODULE, 0, 0, 0, RTC_IRQn, NULL};
|
||||
|
||||
|
|
@ -34,8 +91,11 @@ void rtc_init(void)
|
|||
if (rtc_isenabled()) {
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
RTC_Open(NULL);
|
||||
|
||||
/* POSIX time origin (00:00:00 UTC, Thursday, 1 January 1970) */
|
||||
rtc_write(0);
|
||||
}
|
||||
|
||||
void rtc_free(void)
|
||||
|
|
@ -55,6 +115,57 @@ int rtc_isenabled(void)
|
|||
return !! (RTC->INIT & RTC_INIT_INIT_Active_Msk);
|
||||
}
|
||||
|
||||
time_t rtc_read(void)
|
||||
{
|
||||
/* NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency.
|
||||
* RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect.
|
||||
*/
|
||||
if (! rtc_isenabled()) {
|
||||
rtc_init();
|
||||
}
|
||||
|
||||
/* Used for intermediary between date time of H/W RTC and POSIX time */
|
||||
struct tm datetime_tm;
|
||||
|
||||
if (! t_hwrtc_origin_inited) {
|
||||
t_hwrtc_origin_inited = 1;
|
||||
|
||||
/* Convert date time from H/W RTC to struct TM */
|
||||
rtc_convert_datetime_hwrtc_to_tm(&datetime_tm, &DATETIME_HWRTC_ORIGIN);
|
||||
/* Convert date time of struct TM to POSIX time */
|
||||
if (! _rtc_maketime(&datetime_tm, &t_hwrtc_origin, RTC_FULL_LEAP_YEAR_SUPPORT)) {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
S_RTC_TIME_DATA_T hwrtc_datetime_2K_present;
|
||||
RTC_GetDateAndTime(&hwrtc_datetime_2K_present);
|
||||
/* Convert date time from H/W RTC to struct TM */
|
||||
rtc_convert_datetime_hwrtc_to_tm(&datetime_tm, &hwrtc_datetime_2K_present);
|
||||
/* Convert date time of struct TM to POSIX time */
|
||||
time_t t_hwrtc_elapsed;
|
||||
if (! _rtc_maketime(&datetime_tm, &t_hwrtc_elapsed, RTC_FULL_LEAP_YEAR_SUPPORT)) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Present time in POSIX time */
|
||||
time_t t_present = t_write + (t_hwrtc_elapsed - t_hwrtc_origin);
|
||||
return t_present;
|
||||
}
|
||||
|
||||
void rtc_write(time_t t)
|
||||
{
|
||||
if (! rtc_isenabled()) {
|
||||
rtc_init();
|
||||
}
|
||||
|
||||
t_write = t;
|
||||
|
||||
RTC_SetDateAndTime((S_RTC_TIME_DATA_T *) &DATETIME_HWRTC_ORIGIN);
|
||||
/* NOTE: When engine is clocked by low power clock source (LXT/LIRC), we need to wait for 3 engine clocks. */
|
||||
wait_us((NU_US_PER_SEC / NU_RTCCLK_PER_SEC) * 3);
|
||||
}
|
||||
|
||||
/*
|
||||
struct tm
|
||||
tm_sec seconds after the minute 0-61
|
||||
|
|
@ -67,69 +178,18 @@ int rtc_isenabled(void)
|
|||
tm_yday days since January 1 0-365
|
||||
tm_isdst Daylight Saving Time flag
|
||||
*/
|
||||
|
||||
time_t rtc_read(void)
|
||||
static void rtc_convert_datetime_hwrtc_to_tm(struct tm *datetime_tm, const S_RTC_TIME_DATA_T *datetime_hwrtc)
|
||||
{
|
||||
// NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency.
|
||||
// RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect.
|
||||
if (! rtc_isenabled()) {
|
||||
rtc_init();
|
||||
datetime_tm->tm_year = datetime_hwrtc->u32Year - NU_TM_YEAR0;
|
||||
datetime_tm->tm_mon = datetime_hwrtc->u32Month - 1;
|
||||
datetime_tm->tm_mday = datetime_hwrtc->u32Day;
|
||||
datetime_tm->tm_wday = datetime_hwrtc->u32DayOfWeek;
|
||||
datetime_tm->tm_hour = datetime_hwrtc->u32Hour;
|
||||
if (datetime_hwrtc->u32TimeScale == RTC_CLOCK_12 && datetime_hwrtc->u32AmPm == RTC_PM) {
|
||||
datetime_tm->tm_hour += 12;
|
||||
}
|
||||
|
||||
S_RTC_TIME_DATA_T rtc_datetime;
|
||||
RTC_GetDateAndTime(&rtc_datetime);
|
||||
|
||||
struct tm timeinfo;
|
||||
|
||||
// Convert struct tm to S_RTC_TIME_DATA_T
|
||||
timeinfo.tm_year = rtc_datetime.u32Year - YEAR0;
|
||||
timeinfo.tm_mon = rtc_datetime.u32Month - 1;
|
||||
timeinfo.tm_mday = rtc_datetime.u32Day;
|
||||
timeinfo.tm_wday = rtc_datetime.u32DayOfWeek;
|
||||
timeinfo.tm_hour = rtc_datetime.u32Hour;
|
||||
if (rtc_datetime.u32TimeScale == RTC_CLOCK_12 && rtc_datetime.u32AmPm == RTC_PM) {
|
||||
timeinfo.tm_hour += 12;
|
||||
}
|
||||
timeinfo.tm_min = rtc_datetime.u32Minute;
|
||||
timeinfo.tm_sec = rtc_datetime.u32Second;
|
||||
|
||||
// Convert to timestamp
|
||||
time_t t;
|
||||
if (_rtc_maketime(&timeinfo, &t, RTC_FULL_LEAP_YEAR_SUPPORT) == false) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
return t;
|
||||
}
|
||||
|
||||
void rtc_write(time_t t)
|
||||
{
|
||||
if (! rtc_isenabled()) {
|
||||
rtc_init();
|
||||
}
|
||||
|
||||
// Convert timestamp to struct tm
|
||||
struct tm timeinfo;
|
||||
if (_rtc_localtime(t, &timeinfo, RTC_FULL_LEAP_YEAR_SUPPORT) == false) {
|
||||
return;
|
||||
}
|
||||
|
||||
S_RTC_TIME_DATA_T rtc_datetime;
|
||||
|
||||
// Convert S_RTC_TIME_DATA_T to struct tm
|
||||
rtc_datetime.u32Year = timeinfo.tm_year + YEAR0;
|
||||
rtc_datetime.u32Month = timeinfo.tm_mon + 1;
|
||||
rtc_datetime.u32Day = timeinfo.tm_mday;
|
||||
rtc_datetime.u32DayOfWeek = timeinfo.tm_wday;
|
||||
rtc_datetime.u32Hour = timeinfo.tm_hour;
|
||||
rtc_datetime.u32Minute = timeinfo.tm_min;
|
||||
rtc_datetime.u32Second = timeinfo.tm_sec;
|
||||
rtc_datetime.u32TimeScale = RTC_CLOCK_24;
|
||||
|
||||
// NOTE: Timing issue with write to RTC registers. This delay is empirical, not rational.
|
||||
RTC_SetDateAndTime(&rtc_datetime);
|
||||
//nu_nop(6000);
|
||||
wait_us(100);
|
||||
datetime_tm->tm_min = datetime_hwrtc->u32Minute;
|
||||
datetime_tm->tm_sec = datetime_hwrtc->u32Second;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in New Issue