105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
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* Auxiliar functions to handle date/time along with lwIP sntp implementation.
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*
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* Jesus Alonso (doragasu)
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*/
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#include <stdio.h>
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#include <espressif/esp_common.h>
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#include <esp/timer.h>
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#include <esp/rtc_regs.h>
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#include "sntp.h"
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#define TIMER_COUNT RTC.COUNTER
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// daylight settings
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// Base calculated with value obtained from NTP server (64 bits)
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#define sntp_base (*((uint64_t*)RTC.SCRATCH))
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// Timer value when base was obtained
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#define tim_ref (RTC.SCRATCH[2])
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// Setters and getters for CAL, TZ and DST.
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#define RTC_CAL_SET(val) (RTC.SCRATCH[3] |= (val) & 0x0000FFFF)
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#define RTC_DST_SET(val) (RTC.SCRATCH[3] |= ((val)<<16) & 0x00010000)
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#define RTC_TZ_SET(val) (RTC.SCRATCH[3] |= ((val)<<24) & 0xFF000000)
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#define RTC_CAL_GET() (RTC.SCRATCH[3] & 0x0000FFFF)
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#define RTC_DST_GET() ((RTC.SCRATCH[3] & 0x00010000)>>16)
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#define RTC_TZ_GET() ((((int)RTC.SCRATCH[3]) & ((int)0xFF000000))>>24)
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// Implemented in sntp.c
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void sntp_init(void);
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// Sets time zone. Allowed values are in the range [-11, 13].
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// NOTE: Settings do not take effect until SNTP time is updated. It is
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void sntp_set_timezone(int time_zone) {
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//tz = time_zone;
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RTC_TZ_SET(time_zone);
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}
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// Sets daylight.
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// NOTE: Settings do not take effect until SNTP time is updated.
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void sntp_set_daylight(int day_light) {
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//dst = day_light;
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RTC_DST_SET(day_light);
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}
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void sntp_initialize(int time_zone, int day_light) {
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sntp_base = 0;
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RTC_TZ_SET(time_zone);
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RTC_DST_SET(day_light);
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// To avoid div by 0 exceptions if requesting time before SNTP config
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RTC_CAL_SET(1);
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tim_ref = TIMER_COUNT;
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sntp_init();
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}
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// Check if a timer wrap has occurred. Compensate sntp_base reference
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// if affirmative.
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// TODO: think about multitasking and race conditions
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static inline void sntp_check_timer_wrap(uint32_t current_value) {
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if (current_value < tim_ref) {
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// Timer wrap has occurred, compensate by subtracting 2^32 to ref.
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sntp_base -= 1LLU<<32;
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// DEBUG
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printf("\nTIMER WRAPPED!\n");
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}
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}
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// Return secs. If us is not a null pointer, fill it with usecs
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time_t sntp_get_rtc_time(int32_t *us) {
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time_t secs;
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uint32_t tim;
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uint64_t base;
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tim = TIMER_COUNT;
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// Check for timer wrap
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sntp_check_timer_wrap(tim);
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base = sntp_base + tim - tim_ref;
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secs = base * RTC_CAL_GET() / (1000000U<<12);
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if (us) {
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*us = base * RTC_CAL_GET() % (1000000U<<12);
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}
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return secs;
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}
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/// Update RTC timer. Called by SNTP module each time it receives an update.
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void sntp_update_rtc(time_t t, uint32_t us) {
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// Apply daylight and timezone correction
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t += (RTC_TZ_GET() + RTC_DST_GET()) * 3600;
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// DEBUG: Compute and print drift
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int64_t sntp_current = sntp_base + TIMER_COUNT - tim_ref;
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int64_t sntp_correct = (((uint64_t)us + (uint64_t)t * 1000000U)<<12) / RTC_CAL_GET();
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printf("\nRTC Adjust: drift = %ld ticks, cal = %d\n", (time_t)(sntp_correct - sntp_current), RTC_CAL_GET());
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tim_ref = TIMER_COUNT;
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RTC_CAL_SET(sdk_system_rtc_clock_cali_proc());
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sntp_base = (((uint64_t)us + (uint64_t)t * 1000000U)<<12) / RTC_CAL_GET();
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// DEBUG: Print obtained secs and check calculated secs are the same
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time_t deb = sntp_base * RTC_CAL_GET() / (1000000U<<12);
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printf("\nT: %lu, %lu, %s\n", t, deb, ctime(&deb));
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}
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