FreeCalypso > hg > freecalypso-tools
annotate rvinterf/lowlevel/packetrx.c @ 397:4477d28c77bc
INSTALL: update for the move-out of fc-lcdemu
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 15 Mar 2018 04:59:32 +0000 |
parents | e7502631a0f9 |
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0
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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 "../include/pktmux.h" |
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10 #include "../include/limits.h" |
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11 |
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12 extern int target_fd; |
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13 |
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14 u_char rxpkt[MAX_PKT_FROM_TARGET]; |
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15 size_t rxpkt_len; |
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16 |
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17 static int in_pkt, dle_state, toobig; |
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18 |
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19 static void |
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20 process_inbyte(inb) |
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21 { |
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22 char errbuf[128]; |
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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(errbuf, |
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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 output_line(errbuf); |
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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(errbuf, |
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45 "Rx framing error: %02X after DLE", inb); |
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46 output_line(errbuf); |
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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 >= MAX_PKT_FROM_TARGET) { |
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65 if (!toobig) { |
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66 output_line("Error: Rx packet too big!"); |
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67 toobig = 1; |
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68 } |
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69 return; |
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70 } |
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71 rxpkt[rxpkt_len++] = inb; |
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72 } |
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73 |
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74 void |
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75 process_serial_rx() |
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76 { |
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77 u_char rdbuf[512]; |
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78 int cc, i; |
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79 |
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80 cc = read(target_fd, rdbuf, sizeof rdbuf); |
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81 if (cc <= 0) { |
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82 perror("Error/EOF reading from target"); |
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83 exit(1); |
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84 } |
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85 for (i = 0; i < cc; i++) |
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86 process_inbyte(rdbuf[i]); |
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87 } |