Andrew Boyson / net

A stack which works with or without an Mbed os library. Provides IPv4 or IPv6 with a full 1500 byte buffer.

Dependents:   oldheating gps motorhome heating

udp/ntp/ntptimestamp.c@200:5acbc41bf469, 2021-05-20 (annotated)

Committer:
andrewboyson
Date:
Thu May 20 14:32:52 2021 +0000
Revision:
200:5acbc41bf469
Parent:
124:6e558721ec1c 
Increased number of arp entries from 20 to 30 to accommodate the number of WIZ devices plus a few incoming port 80 calls from the internet.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 124:6e558721ec1c 1 #include <stdint.h>
andrewboyson 124:6e558721ec1c 2 #include <stdbool.h>
andrewboyson 124:6e558721ec1c 3
andrewboyson 124:6e558721ec1c 4 #include "clktime.h"
andrewboyson 124:6e558721ec1c 5 #include "clkutc.h"
andrewboyson 124:6e558721ec1c 6
andrewboyson 124:6e558721ec1c 7 #define SECONDS_BETWEEN_1900_AND_1970 2208988800ULL
andrewboyson 124:6e558721ec1c 8
andrewboyson 124:6e558721ec1c 9 #define ERA_BASE_LOW 1LL //Adjust this from 0 to 1 between 1968 and 2036; 1 to 2 between 2104 and 2168
andrewboyson 124:6e558721ec1c 10 #define ERA_BASE_HGH 0LL //Adjust this from 0 to 1 between 2036 and 2104; 1 to 2 between 2172 and 2240
andrewboyson 124:6e558721ec1c 11
andrewboyson 124:6e558721ec1c 12 uint64_t NtpTimeStampFromClkTime(clktime tai)
andrewboyson 124:6e558721ec1c 13 {
andrewboyson 124:6e558721ec1c 14 clktime utc = ClkUtcFromTai(tai);
andrewboyson 124:6e558721ec1c 15 uint64_t timestamp = utc << (32 - CLK_TIME_ONE_SECOND_SHIFT);
andrewboyson 124:6e558721ec1c 16
andrewboyson 124:6e558721ec1c 17 timestamp += SECONDS_BETWEEN_1900_AND_1970 << 32; //This should just wrap around the unsigned timestamp removing the unwanted era.
andrewboyson 124:6e558721ec1c 18
andrewboyson 124:6e558721ec1c 19 return timestamp;
andrewboyson 124:6e558721ec1c 20 }
andrewboyson 124:6e558721ec1c 21 clktime NtpTimeStampToClkTime(uint64_t timestamp)
andrewboyson 124:6e558721ec1c 22 {
andrewboyson 124:6e558721ec1c 23 bool isHigh = (timestamp & (1ULL << 63)) != 0;
andrewboyson 124:6e558721ec1c 24
andrewboyson 124:6e558721ec1c 25 clktime utc = timestamp - (SECONDS_BETWEEN_1900_AND_1970 << 32);
andrewboyson 124:6e558721ec1c 26 utc >>= (32 - CLK_TIME_ONE_SECOND_SHIFT);
andrewboyson 124:6e558721ec1c 27
andrewboyson 124:6e558721ec1c 28 //Correct for era
andrewboyson 124:6e558721ec1c 29 if (isHigh) utc += ERA_BASE_HGH << (32 + CLK_TIME_ONE_SECOND_SHIFT);
andrewboyson 124:6e558721ec1c 30 else utc += ERA_BASE_LOW << (32 + CLK_TIME_ONE_SECOND_SHIFT);
andrewboyson 124:6e558721ec1c 31
andrewboyson 124:6e558721ec1c 32 clktime tai = ClkUtcToTai(utc);
andrewboyson 124:6e558721ec1c 33
andrewboyson 124:6e558721ec1c 34 return tai;
andrewboyson 124:6e558721ec1c 35 }
andrewboyson 124:6e558721ec1c 36