132 lines
3.5 KiB
C
132 lines
3.5 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 <FreeRTOS.h>
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#include <assert.h>
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#include <semphr.h>
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#include "sntp.h"
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#ifdef SNTP_LOGD_WITH_PRINTF
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#define SNTP_LOGD(FMT, ...) printf(FMT "\n", ##__VA_ARGS__)
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#endif
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#ifndef SNTP_LOGD
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#define SNTP_LOGD(...)
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#define SKIP_DIAGNOSTICS
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#endif
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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 sntp_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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// To protect access to the above.
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static SemaphoreHandle_t sntp_sem = NULL;
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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_sem = xSemaphoreCreateMutex();
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assert(sntp_sem == NULL);
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sntp_init();
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}
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// Return usecs.
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static inline uint64_t sntp_get_rtc_time() {
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xSemaphoreTake(sntp_sem, portMAX_DELAY);
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uint32_t tim = TIMER_COUNT;
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// Assume the difference does not overflow in which case
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// wrapping of the RTC timer still yields a good difference.
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uint32_t diff = tim - tim_ref;
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tim_ref = tim;
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uint64_t diff_us = ((uint64_t)diff * cal) >> 12;
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uint64_t base = sntp_base + diff_us;
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sntp_base = base;
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xSemaphoreGive(sntp_sem);
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return base;
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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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if (sntp_base == 0) {
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printf("Time not valid yet");
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return EINVAL;
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}
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uint64_t base = sntp_get_rtc_time();
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tp->tv_sec = base / 1000000U;
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tp->tv_usec = base % 1000000U;
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return 0;
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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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int64_t sntp_correct = (uint64_t)us + (uint64_t)t * 1000000U;
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xSemaphoreTake(sntp_sem, portMAX_DELAY);
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uint32_t tim = TIMER_COUNT;
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tim_ref = tim;
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sntp_base = sntp_correct;
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#ifndef SKIP_DIAGNOSTICS
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// Assume the difference does not overflow in which case
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// wrapping of the RTC timer still yields a good difference.
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uint32_t diff = tim - tim_ref;
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uint64_t diff_us = ((uint64_t)diff * cal) >> 12;
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uint64_t sntp_current = sntp_base + diff_us;
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#endif
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cal = sdk_system_rtc_clock_cali_proc();
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xSemaphoreGive(sntp_sem);
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SNTP_LOGD("SNTP RTC Adjust: drift = %d usec, cal = %d", (int)(sntp_correct - sntp_current), cal);
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}
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