FreeCalypso > hg > freecalypso-tools

annotate rvinterf/lowlevel/packetrx.c @ 1014:961efadd530a default tip

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fc-shell TCH DL handler: add support for CSD modes TCH DL capture mechanism in FC Tourmaline firmware has been extended to support CSD modes in addition to speech - add the necessary support on the host tools side. It needs to be noted that this mechanism in its present state does NOT provide the debug utility value that was sought: as we learned only after the code was implemented, TI's DSP has a misfeature in that the buffer we are reading (a_dd_0[]) is zeroed out when the IDS block is enabled, i.e., we are reading all zeros and not the real DL bits we were after. But since the code has already been written, we are keeping it - perhaps we can do some tests with IDS disabled.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 26 Nov 2024 06:27:43 +0000
parents e7502631a0f9
children
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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 }