FreeCalypso > hg > freecalypso-sw

annotate rvinterf/old/packetrx.c @ 923:10b4bed10192

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gsm-fw/L1: fix for the DSP patch corruption bug The L1 code we got from the LoCosto fw contains a feature for DSP CPU load measurement. This feature is a LoCosto-ism, i.e., not applicable to earlier DBB chips (Calypso) with their respective earlier DSP ROMs. Most of the code dealing with that feature is conditionalized as #if (DSP >= 38), but one spot was missed, and the MCU code was writing into an API word dealing with this feature. In TCS211 this DSP API word happens to be used by the DSP code patch, hence that write was corrupting the patched DSP code.
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Mon, 19 Oct 2015 17:13:56 +0000
parents f42854da4563
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 "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 }