FreeCalypso > hg > freecalypso-tools

annotate rvinterf/lowlevel/packettx.c @ 34:5ae8f6e55371

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ringtools/examples: so-far-unsuccessful Melody E1 experiments
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Oct 2016 08:17:07 +0000
parents e7502631a0f9
children
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1 /*
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2 * This module handles the lowest level of serial packet Tx
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/time.h>
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7 #include <stdio.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12 #include "../include/pktmux.h"
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13 #include "../include/limits.h"
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14
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15 extern int target_fd;
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16 extern int wakeup_after_sec;
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17
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18 static u_char wakeup_shot[64];
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19 static struct timeval last_tx;
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20
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21 send_pkt_to_target(pkt, pktlen)
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22 u_char *pkt;
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23 {
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24 u_char buf[MAX_PKT_TO_TARGET*2+2];
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25 u_char *cp, *dp, *endp;
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26 int c;
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27 struct timeval curtime, timediff;
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28
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29 gettimeofday(&curtime, 0);
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30 if (wakeup_after_sec) {
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31 timersub(&curtime, &last_tx, &timediff);
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32 if (timediff.tv_sec >= wakeup_after_sec) {
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33 write(target_fd, wakeup_shot, sizeof wakeup_shot);
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34 usleep(100000);
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35 }
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36 }
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37 endp = pkt + pktlen;
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38 dp = buf;
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39 *dp++ = STX;
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40 for (cp = pkt; cp < endp; cp++) {
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41 c = *cp;
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42 if (c == STX || c == DLE)
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43 *dp++ = DLE;
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44 *dp++ = c;
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45 }
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46 *dp++ = STX;
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47 write(target_fd, buf, dp - buf);
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48 bcopy(&curtime, &last_tx, sizeof(struct timeval));
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49 }