121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/*
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* Auxiliary 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 <sys/reent.h>
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#include <sys/types.h>
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#include <sys/errno.h>
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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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// Calibration value
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#define cal (RTC.SCRATCH[3])
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// Timezone related data.
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static struct timezone stz;
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// Implemented in sntp.c
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void sntp_init(void);
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// Sets time zone.
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// NOTE: Settings do not take effect until SNTP time is updated.
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void sntp_set_timezone(const struct timezone *tz) {
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if (tz) {
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stz = *tz;
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} else {
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stz.tz_minuteswest = 0;
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stz.tz_dsttime = 0;
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}
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}
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// Initialization
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void sntp_initialize(const struct timezone *tz) {
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if (tz) {
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stz = *tz;
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} else {
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stz.tz_minuteswest = 0;
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stz.tz_dsttime = 0;
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}
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sntp_base = 0;
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// To avoid div by 0 exceptions if requesting time before SNTP config
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cal = 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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inline 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 * cal / (1000000U<<12);
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if (us) {
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*us = base * cal % (1000000U<<12);
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}
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return secs;
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}
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// Syscall implementation. doesn't seem to use tzp.
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int _gettimeofday_r(struct _reent *r, struct timeval *tp, void *tzp) {
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(void)r;
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// Syscall defined by xtensa newlib defines tzp as void*
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// So it looks like it is not used. Also check tp is not NULL
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if (tzp || !tp) return EINVAL;
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tp->tv_sec = sntp_get_rtc_time((int32_t*)&tp->tv_usec);
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return 0;
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}
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// Added te get nearer the standard way of using time functions.
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time_t time(time_t *tloc) {
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time_t datetime;
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datetime = sntp_get_rtc_time(NULL);
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if (tloc) *tloc = datetime;
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return datetime;
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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 += (stz.tz_minuteswest + stz.tz_dsttime * 60) * 60;
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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) / cal;
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printf("\nRTC Adjust: drift = %ld ticks, cal = %d\n", (time_t)(sntp_correct - sntp_current), cal);
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tim_ref = TIMER_COUNT;
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cal = sdk_system_rtc_clock_cali_proc();
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sntp_base = (((uint64_t)us + (uint64_t)t * 1000000U)<<12) / cal;
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}
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