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Replace mktime/localtime with interrupt-safe version in rtc 

The use of mktime was causing a fault when called in interrupt handler because on GCC it lock the mutex protecting the environment, To overcome this issue, this patch add dedicated routine to convert a time_t into a tm and vice versa.
In the process mktime has been optimized and is now an order of magnitude faster than the routines present in the C library.
pull/5355/head
ccli8 2017-09-04 11:08:09 +08:00 committed by adbridge
parent 8c987698ad
commit 0ece4d02b0
1 changed files with 13 additions and 9 deletions
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22
targets/TARGET_NUVOTON/TARGET_M480/rtc_api.c
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@ -22,6 +22,7 @@
#include "mbed_error.h"
#include "nu_modutil.h"
#include "nu_miscutil.h"
#include "mbed_mktime.h"
#define YEAR0 1900
//#define EPOCH_YR 1970
@ -92,7 +93,7 @@ time_t rtc_read(void)
timeinfo.tm_sec = rtc_datetime.u32Second;
// Convert to timestamp
time_t t = mktime(&timeinfo);
time_t t = _rtc_mktime(&timeinfo);
return t;
}
@ -104,18 +105,21 @@ void rtc_write(time_t t)
}
// Convert timestamp to struct tm
struct tm *timeinfo = localtime(&t);
struct tm timeinfo;
if (_rtc_localtime(t, &timeinfo) == 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.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.