FreeCalypso > hg > freecalypso-tools

annotate rvinterf/lowlevel/packetrx.c @ 854:74331b35b1da

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ringtools/examples/ring.pwt: PWT equivalent of ring.buz
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 09 Nov 2021 16:39:52 +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 "../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 }