freecalypso-tools: uptools/atcmd/settime.c annotate

annotate uptools/atcmd/settime.c @ 407:19e5a3e2f9c0

fcup-settime: moved time() retrieval a little closer to the output A fundamental problem with all simple time transfer tools is that there is always some delay between the time retrieval on the source system and that transmitted time being set on the destination, and the resulting time on the destination system is off by that delay amount. This delay cannot be fully eliminated when working in a simple environment like ours, but we should make our best effort to minimize it. In the present case, moving the atinterf_init() call before the time() retrieval should make a teensy-tiny improvement.

author	Mychaela Falconia <falcon@freecalypso.org>
date	Sat, 11 Aug 2018 21:52:17 +0000
parents	b61b81d3cece
children	dc2fd8e6f42c

rev	line source
387 b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	1 /*
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	2 * This utility sends an AT+CCLK command to the GSM device to set its time
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	3 * to the host's notion of local time.
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	4 */
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	5
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	6 #include <time.h>
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	7 #include <stdio.h>
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	8 #include <stdlib.h>
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	9 #include <unistd.h>
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	10 #include "../../rvinterf/include/exitcodes.h"
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	11
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	12 main(argc, argv)
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	13 char **argv;
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	14 {
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	15 int c;
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	16 extern int optind;
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	17 time_t unixtime;
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	18 struct tm *tm;
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	19 char command[32];
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	20
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	21 while ((c = getopt(argc, argv, "B:np:RX:")) != EOF)
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	22 if (!atinterf_cmdline_opt(c)) {
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	23 /* error msg already printed */
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	24 exit(ERROR_USAGE);
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	25 }
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	26 if (argc != optind) {
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	27 fprintf(stderr, "usage: %s [options]\n", argv[0]);
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	28 exit(ERROR_USAGE);
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	29 }
407 19e5a3e2f9c0 fcup-settime: moved time() retrieval a little closer to the output Mychaela Falconia <falcon@freecalypso.org> parents: 387 diff changeset	30 atinterf_init();
387 b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	31 time(&unixtime);
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	32 tm = localtime(&unixtime);
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	33 sprintf(command, "AT+CCLK=\"%02d/%02d/%02d,%02d:%02d:%02d%+03d\"",
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	34 tm->tm_year % 100, tm->tm_mon + 1, tm->tm_mday,
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	35 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff / (15*60));
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	36 atinterf_exec_cmd_needok(command, 0, 0);
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	37 exit(0);
b61b81d3cece fcup-settime program written, compiles, produces expected AT+CCLK command Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	38 }

FreeCalypso > hg > freecalypso-tools

annotate uptools/atcmd/settime.c @ 407:19e5a3e2f9c0