A time interface class. This class replicates the normal time functions, but goes a couple of steps further. mbed library 82 and prior has a defective gmtime function. Also, this class enables access to setting the time, and adjusting the accuracy of the RTC.
Dependents: CI-data-logger-server WattEye X10Svr SSDP_Server
TimeInterface.cpp
- Committer:
- WiredHome
- Date:
- 2014-06-08
- Revision:
- 0:61112ca9193b
- Child:
- 1:2ee90f546f54
File content as of revision 0:61112ca9193b:
#include "TimeInterface.h" #include "rtc_api.h" #ifdef WIN32 // Fake it out for Win32 development and testing struct LPC { unsigned long CCR; // Clock Control register unsigned long GPREG0; // General Purpose Register #0 - 32-bit Battery backed unsigned long GPREG1; // General Purpose Register #1 - 32-bit Battery backed unsigned long CALIBRATION; // Calibration Register }; struct LPC X; struct LPC * LPC_RTC = &X; #define set_time(x) (void)x #endif TimeInterface::TimeInterface() { } TimeInterface::~TimeInterface() { } clock_t TimeInterface::clock(void) { return std::clock(); } time_t TimeInterface::time(time_t* timer) { return std::time(timer); } char * TimeInterface::ctime(const time_t * timer) { char * p = std::ctime(timer); if (strlen(p) < sizeof(result)) { strcpy(result, p); p = strchr(result, '\n'); if (p) *p = '\0'; } else { result[0] = '\0'; } return result; } char * TimeInterface::asctime(const struct tm_ex *timeptr) { static const char wday_name[][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; static const char mon_name[][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; sprintf(result, "%.3s %.3s%3d %.2d:%.2d:%.2d %d", wday_name[timeptr->tm_wday % 7], mon_name[timeptr->tm_mon % 12], timeptr->tm_mday, timeptr->tm_hour, timeptr->tm_min, timeptr->tm_sec, 1900 + timeptr->tm_year); return result; } struct tm_ex * TimeInterface::gmtime(const time_t * timer) { time_t priv = *timer + (get_tzo_min() * 60); struct tm * tmp = std::localtime(&priv); tm_ext.tm_sec = tmp->tm_sec; tm_ext.tm_min = tmp->tm_min; tm_ext.tm_hour = tmp->tm_hour; tm_ext.tm_mday = tmp->tm_mday; tm_ext.tm_mon = tmp->tm_mon; tm_ext.tm_year = tmp->tm_year; tm_ext.tm_wday = tmp->tm_wday; tm_ext.tm_yday = tmp->tm_yday; tm_ext.tm_isdst = tmp->tm_isdst; tm_ext.tm_tzo_min = get_tzo_min(); return &tm_ext; } struct tm_ex * TimeInterface::localtime(const time_t * timer) { struct tm * tmp = std::localtime(timer); tm_ext.tm_sec = tmp->tm_sec; tm_ext.tm_min = tmp->tm_min; tm_ext.tm_hour = tmp->tm_hour; tm_ext.tm_mday = tmp->tm_mday; tm_ext.tm_mon = tmp->tm_mon; tm_ext.tm_year = tmp->tm_year; tm_ext.tm_wday = tmp->tm_wday; tm_ext.tm_yday = tmp->tm_yday; tm_ext.tm_isdst = tmp->tm_isdst; tm_ext.tm_tzo_min = get_tzo_min(); return &tm_ext; } time_t TimeInterface::mktime(struct tm_ex * timeptr) { return std::mktime((struct tm *)timeptr); } size_t TimeInterface::strftime(char * ptr, size_t maxsize, const char * format, const struct tm_ex * timeptr) { return std::strftime(ptr, maxsize, format, (struct tm *)timeptr); } double TimeInterface::difftime(time_t end, time_t beginning) { return std::difftime(end, beginning); } // time zone functions void TimeInterface::set_time(time_t t, int16_t tzo_min) { time_t tval = t - tzo_min; rtc_init(); rtc_write(tval); LPC_RTC->GPREG1 = tval; } void TimeInterface::set_tzo_min(int16_t tzo_min) { uint16_t th; uint32_t treg; if (tzo_min >= -720 && tzo_min <= 720) { th = (uint16_t)(-tzo_min); treg = (th << 16) | (uint16_t)tzo_min; LPC_RTC->GPREG0 = treg; //printf("set_tzo(%d) %d is %08X\r\n", tzo, th, LPC_RTC->GPREG0); } } int16_t TimeInterface::get_tzo_min(void) { uint16_t th, tl; th = LPC_RTC->GPREG0 >> 16; tl = LPC_RTC->GPREG0; //printf("get_tzo() is %04X %04X\r\n", th, tl); if ((uint16_t)(th + tl) == 0) { return tl; } else { return 0; } } time_t TimeInterface::get_timelastset(void) { return LPC_RTC->GPREG1; } int32_t TimeInterface::get_cal() { int32_t calvalue = LPC_RTC->CALIBRATION & 0x3FFFF; if (calvalue & 0x20000) { calvalue = -(calvalue & 0x1FFFF); } return calvalue; } void TimeInterface::set_cal(int32_t calibration) { if (calibration) { if (calibration < 0) { calibration = (-calibration & 0x1FFFF) | 0x20000; } LPC_RTC->CCR = 0x000001; //(LPC_RTC->CCR & 0x0003); // Clear CCALEN to enable it } else { LPC_RTC->CCR = 0x000011; //(LPC_RTC->CCR & 0x0003) | 0x0010; // Set CCALEN to disable it } LPC_RTC->CALIBRATION = calibration; } bool TimeInterface::adjust_sec(int32_t adjustSeconds) { time_t lastSet = get_timelastset(); if (lastSet != 0) { time_t seconds = time(NULL); // get "now" according to the rtc int32_t delta = seconds - lastSet; int32_t curCal = get_cal(); int32_t calMAX = 131071; int32_t secPerDay = 86400; float errSecPerDay; // Convert the current calibration and the adjustment into // the new calibration value // assume it is +10sec and it has been 2days, then the adjustment // needs to be +5 sec per day, or one adjustment every 1/5th // of a day, or 1 adjustment every 86400/5 counts. // delta = now - then (number of elapsed seconds) if (adjustSeconds != 0 && delta != 0) { int32_t calFactor; // Make the clock correct seconds = seconds + adjustSeconds; set_time(seconds); // Compute the calibration factor errSecPerDay = (float)adjustSeconds / ((float)(delta)/secPerDay); calFactor = (int32_t)((float)secPerDay/errSecPerDay); if (abs(calFactor) < calMAX) set_cal(calFactor); } return true; } else { return false; } }