FreeCalypso > hg > freecalypso-tools

annotate rvinterf/lowlevel/packettx.c @ 416:30f6d1c32c6f

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doc/Flash-boot-defect article removed (no longer relevant) This article is no longer relevant because the issue in question only affected one (1) defective FCDEV3B board which was not and never will be sold.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Oct 2018 07:11:08 +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 }