| 1 | /* |
| 2 | * freediag - Vehicle Diagnostic Utility |
| 3 | * |
| 4 | * |
| 5 | * Copyright (C) 2001 Richard Almeida & Ibex Ltd ([email protected]) |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | * |
| 21 | ************************************************************************* |
| 22 | * |
| 23 | * |
| 24 | * DTC handling routines |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | #include <stdio.h> |
| 29 | #include <string.h> |
| 30 | |
| 31 | #include "diag.h" |
| 32 | #include "diag_dtc.h" |
| 33 | |
| 34 | |
| 35 | |
| 36 | //do not use *allocs or open handles in diag_dtc_init ! |
| 37 | void diag_dtc_init(void) { |
| 38 | } |
| 39 | |
| 40 | /** DTC decoding routine. |
| 41 | * |
| 42 | * Generate description (or error) string for given DTCs. |
| 43 | * @param data: Data representing the DTC |
| 44 | * @param len: length of *data |
| 45 | * @param vehicle: (optional) Vehicle name; unused. |
| 46 | * @param ecu: (optional) ECU Name; unused |
| 47 | * @param protocol: Protocol (see include file) |
| 48 | * @param buf: Buffer to write the output |
| 49 | * @param bufsize: size of *buf |
| 50 | * @return pointer to *buf, which may be useful to printf or fprintf... |
| 51 | */ |
| 52 | |
| 53 | char *diag_dtc_decode(const uint8_t *data, int len, |
| 54 | UNUSED(const char *vehicle), UNUSED(const char *ecu), |
| 55 | enum diag_dtc_protocol protocol, |
| 56 | char *buf, const size_t bufsize) { |
| 57 | char area; |
| 58 | |
| 59 | switch (protocol) { |
| 60 | case dtc_proto_j2012: |
| 61 | if (len != 2) { |
| 62 | strncpy(buf, "DTC too short for J1850 decode\n", bufsize); |
| 63 | return buf; |
| 64 | } |
| 65 | |
| 66 | switch ((data[0] >> 6) & 0x03) { /* Top 2 bits are area */ |
| 67 | case 0: |
| 68 | area = 'P'; |
| 69 | break; |
| 70 | case 1: |
| 71 | area = 'C'; |
| 72 | break; |
| 73 | case 2: |
| 74 | area = 'B'; |
| 75 | break; |
| 76 | case 3: |
| 77 | area = 'U'; |
| 78 | break; |
| 79 | default: |
| 80 | fprintf(stderr, "Illegal data[0] value\n"); |
| 81 | area = 'X'; |
| 82 | break; |
| 83 | } |
| 84 | snprintf(buf, bufsize, "%c%02X%02X ", area, data[0] & 0x3f, data[1]&0xff); |
| 85 | break; |
| 86 | |
| 87 | case dtc_proto_int8: |
| 88 | case dtc_proto_int16: |
| 89 | case dtc_proto_int32: |
| 90 | case dtc_proto_text: |
| 91 | snprintf(buf, bufsize, "Unimplemented Protocol %d\n", protocol); |
| 92 | break; |
| 93 | |
| 94 | default: |
| 95 | snprintf(buf, bufsize, "Unknown Protocol %d\n", protocol); |
| 96 | break; |
| 97 | } |
| 98 | return buf; |
| 99 | } |
| 100 | |