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annotate serial/xmit.c @ 81:8c23d2a9c013

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doc/GrcardSIM2-programming: update for fcsim1-program
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 09 Apr 2021 08:35:54 +0000
parents 5ee00413b8af
children
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1 /*
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2 * This module implements the function for sending byte strings
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3 * to the SIM and collecting the UART echo.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/time.h>
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8 #include <sys/errno.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include <unistd.h>
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14
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15 extern int target_fd;
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16 extern int inverse_coding;
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17
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18 send_bytes_to_sim(data, nbytes)
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19 u_char *data;
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20 unsigned nbytes;
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21 {
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22 u_char buf1[255], buf2[255];
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23 fd_set fds;
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24 struct timeval tv;
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25 unsigned rcvd;
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26 int cc;
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27
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28 bcopy(data, buf1, nbytes);
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29 if (inverse_coding)
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30 invert_bytes(buf1, nbytes);
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31 write(target_fd, buf1, nbytes);
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32 for (rcvd = 0; rcvd < nbytes; ) {
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33 FD_ZERO(&fds);
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34 FD_SET(target_fd, &fds);
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35 tv.tv_sec = 1;
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36 tv.tv_usec = 0;
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37 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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38 if (cc < 0) {
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39 if (errno == EINTR)
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40 continue;
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41 perror("select");
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42 return(-1);
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43 }
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44 if (cc < 1) {
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45 fprintf(stderr,
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46 "error: timeout waiting for echo of Tx bytes\n");
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47 return(-1);
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48 }
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49 cc = read(target_fd, buf2 + rcvd, nbytes - rcvd);
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50 if (cc <= 0) {
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51 perror("read after successful select");
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52 return(-1);
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53 }
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54 rcvd += cc;
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55 }
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56 if (bcmp(buf1, buf2, nbytes)) {
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57 fprintf(stderr, "error: UART echo mismatch\n");
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58 return(-1);
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59 } else
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60 return(0);
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61 }