FreeCalypso > hg > freecalypso-tools

annotate rvinterf/old/before-rvinterf/packetrx.c @ 913:1b8929cb7371

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doc/Host-tools-overview: document fc-vm2gsmx
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 29 Dec 2022 21:36:37 +0000
parents e7502631a0f9
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This module handles the lowest level of serial packet Rx
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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 <stdio.h>
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7 #include <stdlib.h>
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8 #include <unistd.h>
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9 #include "pktmux.h"
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10
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11 extern int target_fd;
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12
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13 #define MAXPKT 512
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14 u_char rxpkt[MAXPKT];
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15 size_t rxpkt_len;
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16
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17 extern char pr_item[];
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18
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19 static int in_pkt, dle_state, toobig;
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20
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21 static void
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22 process_inbyte(inb)
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23 {
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24 if (!in_pkt) {
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25 if (inb != STX || dle_state) {
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26 rxpkt_len++;
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27 dle_state = (inb == DLE);
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28 return;
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29 }
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30 if (rxpkt_len) {
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31 sprintf(pr_item,
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32 "Warning: Rx %u byte%s outside of a packet",
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33 (unsigned)rxpkt_len, rxpkt_len != 1 ? "s" : "");
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34 print_item();
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35 rxpkt_len = 0;
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36 }
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37 in_pkt = 1;
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38 toobig = 0;
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39 return;
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40 }
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41 if (dle_state) {
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42 dle_state = 0;
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43 if (inb != STX && inb != DLE) {
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44 sprintf(pr_item,
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45 "Rx framing error: %02X after DLE\n", inb);
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46 print_item();
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47 in_pkt = 0;
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48 rxpkt_len = 0;
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49 return;
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50 }
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51 goto data;
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52 }
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53 if (inb == DLE) {
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54 dle_state = 1;
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55 return;
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56 } else if (inb == STX) {
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57 if (!rxpkt_len)
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58 return;
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59 in_pkt = 0;
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60 handle_rx_packet();
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61 rxpkt_len = 0;
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62 return;
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63 }
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64 data: if (rxpkt_len >= MAXPKT) {
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65 if (!toobig) {
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66 sprintf(pr_item, "Error: Rx packet too big!\n");
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67 print_item();
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68 toobig = 1;
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69 }
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70 return;
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71 }
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72 rxpkt[rxpkt_len++] = inb;
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73 }
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74
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75 void
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76 process_serial_rx()
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77 {
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78 u_char rdbuf[512];
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79 int cc, i;
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80
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81 cc = read(target_fd, rdbuf, sizeof rdbuf);
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82 if (cc <= 0) {
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83 perror("Error/EOF reading from target");
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84 exit(1);
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85 }
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86 for (i = 0; i < cc; i++)
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87 process_inbyte(rdbuf[i]);
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88 }