112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/*
|
|
* Auxiliary functions to handle date/time along with lwIP sntp implementation.
|
|
*
|
|
* Jesus Alonso (doragasu)
|
|
*/
|
|
|
|
#include <sys/reent.h>
|
|
#include <sys/types.h>
|
|
#include <sys/errno.h>
|
|
#include <stdio.h>
|
|
#include <espressif/esp_common.h>
|
|
#include <esp/timer.h>
|
|
#include <esp/rtc_regs.h>
|
|
#include "sntp.h"
|
|
|
|
#define TIMER_COUNT RTC.COUNTER
|
|
|
|
// daylight settings
|
|
// Base calculated with value obtained from NTP server (64 bits)
|
|
#define sntp_base (*((uint64_t*)RTC.SCRATCH))
|
|
// Timer value when base was obtained
|
|
#define tim_ref (RTC.SCRATCH[2])
|
|
// Calibration value
|
|
#define cal (RTC.SCRATCH[3])
|
|
|
|
// Timezone related data.
|
|
static struct timezone stz;
|
|
|
|
// Implemented in sntp.c
|
|
void sntp_init(void);
|
|
|
|
// Sets time zone.
|
|
// NOTE: Settings do not take effect until SNTP time is updated.
|
|
void sntp_set_timezone(const struct timezone *tz) {
|
|
if (tz) {
|
|
stz = *tz;
|
|
} else {
|
|
stz.tz_minuteswest = 0;
|
|
stz.tz_dsttime = 0;
|
|
}
|
|
}
|
|
|
|
// Initialization
|
|
void sntp_initialize(const struct timezone *tz) {
|
|
if (tz) {
|
|
stz = *tz;
|
|
} else {
|
|
stz.tz_minuteswest = 0;
|
|
stz.tz_dsttime = 0;
|
|
}
|
|
sntp_base = 0;
|
|
// To avoid div by 0 exceptions if requesting time before SNTP config
|
|
cal = 1;
|
|
tim_ref = TIMER_COUNT;
|
|
sntp_init();
|
|
}
|
|
|
|
// Check if a timer wrap has occurred. Compensate sntp_base reference
|
|
// if affirmative.
|
|
// TODO: think about multitasking and race conditions
|
|
static inline void sntp_check_timer_wrap(uint32_t current_value) {
|
|
if (current_value < tim_ref) {
|
|
// Timer wrap has occurred, compensate by subtracting 2^32 to ref.
|
|
sntp_base -= 1LLU<<32;
|
|
// DEBUG
|
|
printf("\nTIMER WRAPPED!\n");
|
|
}
|
|
}
|
|
|
|
// Return secs. If us is not a null pointer, fill it with usecs
|
|
inline time_t sntp_get_rtc_time(int32_t *us) {
|
|
time_t secs;
|
|
uint32_t tim;
|
|
uint64_t base;
|
|
|
|
tim = TIMER_COUNT;
|
|
// Check for timer wrap
|
|
sntp_check_timer_wrap(tim);
|
|
base = sntp_base + tim - tim_ref;
|
|
secs = base * cal / (1000000U<<12);
|
|
if (us) {
|
|
*us = base * cal % (1000000U<<12);
|
|
}
|
|
return secs;
|
|
}
|
|
|
|
// Syscall implementation. doesn't seem to use tzp.
|
|
int _gettimeofday_r(struct _reent *r, struct timeval *tp, void *tzp) {
|
|
(void)r;
|
|
// Syscall defined by xtensa newlib defines tzp as void*
|
|
// So it looks like it is not used. Also check tp is not NULL
|
|
if (tzp || !tp) return EINVAL;
|
|
|
|
tp->tv_sec = sntp_get_rtc_time((int32_t*)&tp->tv_usec);
|
|
return 0;
|
|
}
|
|
|
|
// Update RTC timer. Called by SNTP module each time it receives an update.
|
|
void sntp_update_rtc(time_t t, uint32_t us) {
|
|
// Apply daylight and timezone correction
|
|
t += (stz.tz_minuteswest + stz.tz_dsttime * 60) * 60;
|
|
// DEBUG: Compute and print drift
|
|
int64_t sntp_current = sntp_base + TIMER_COUNT - tim_ref;
|
|
int64_t sntp_correct = (((uint64_t)us + (uint64_t)t * 1000000U)<<12) / cal;
|
|
printf("\nRTC Adjust: drift = %ld ticks, cal = %d\n", (time_t)(sntp_correct - sntp_current), cal);
|
|
|
|
tim_ref = TIMER_COUNT;
|
|
cal = sdk_system_rtc_clock_cali_proc();
|
|
|
|
sntp_base = (((uint64_t)us + (uint64_t)t * 1000000U)<<12) / cal;
|
|
}
|
|
|