FreeCalypso > hg > freecalypso-tools
view loadtools/labaud.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 | 8c011177adb9 |
children |
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/* * This module handles the switching of serial baud rates * in coordination with loadagent. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include "../libserial/baudrate.h" extern int target_fd; extern struct baudrate *current_baud_rate; extern struct baudrate *find_baudrate_by_name(); loadagent_switch_baud(newbr) struct baudrate *newbr; { char *argv[3]; static char U = 'U'; printf("Switching loadagent communication to %s baud\n", newbr->name); argv[0] = "baud"; argv[1] = newbr->name; argv[2] = 0; tpinterf_make_cmd(argv); if (tpinterf_send_cmd() < 0) return(-1); set_serial_baudrate(newbr); usleep(150000); write(target_fd, &U, 1); return tpinterf_pass_output(1); } cmd_baud(argc, argv) char **argv; { struct baudrate *br; if (argc < 2) { printf("Current baud rate is %s\n", current_baud_rate->name); return(0); } br = find_baudrate_by_name(argv[1]); if (!br) return(-1); /* error msg already printed */ return loadagent_switch_baud(br); }