Tony Mudd
Program to read the temperature from multiple DS18B20 sensors on the same pin. The original library/code came from Petras Saduikis (see http://mbed.org/users/snatch59/programs/OneWireCRC/gpdz56), but I've modified it to remember the address of multiple sensors all connected to the same data pin. My sample program displays the temperature of each device in turn. If you want to see more of what's going on behind the scenes turn on the debug by setting DebugTrace pc(OFF, TO_SERIAL); to ON (instead of OFF) in the couple of places it's used - it will log the device addresses as they are found etc. The addresses are set in the devices at the factory - I don't think they can be changed, the search always seems to find them in the same order, but this won't be anything to do with the way you've plugged them in. I've had a play with up to 7 sensors (the code has a limit of 10 hardwired in it, but this would be easy to change)
DebugTrace.cpp@0:fb8b6da96a8b, 2011-07-17 (annotated)
- Committer:
- tonymudd
- Date:
- Sun Jul 17 15:56:49 2011 +0000
- Revision:
- 0:fb8b6da96a8b
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| tonymudd | 0:fb8b6da96a8b | 1 | /* |
| tonymudd | 0:fb8b6da96a8b | 2 | * DebugTrace. Allows dumping debug messages/values to serial or |
| tonymudd | 0:fb8b6da96a8b | 3 | * to file. |
| tonymudd | 0:fb8b6da96a8b | 4 | * |
| tonymudd | 0:fb8b6da96a8b | 5 | * Copyright (C) <2009> Petras Saduikis <petras@petras.co.uk> |
| tonymudd | 0:fb8b6da96a8b | 6 | * |
| tonymudd | 0:fb8b6da96a8b | 7 | * This file is part of DebugTrace. |
| tonymudd | 0:fb8b6da96a8b | 8 | * |
| tonymudd | 0:fb8b6da96a8b | 9 | * DebugTrace is free software: you can redistribute it and/or modify |
| tonymudd | 0:fb8b6da96a8b | 10 | * it under the terms of the GNU General Public License as published by |
| tonymudd | 0:fb8b6da96a8b | 11 | * the Free Software Foundation, either version 3 of the License, or |
| tonymudd | 0:fb8b6da96a8b | 12 | * (at your option) any later version. |
| tonymudd | 0:fb8b6da96a8b | 13 | * |
| tonymudd | 0:fb8b6da96a8b | 14 | * DebugTrace is distributed in the hope that it will be useful, |
| tonymudd | 0:fb8b6da96a8b | 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| tonymudd | 0:fb8b6da96a8b | 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| tonymudd | 0:fb8b6da96a8b | 17 | * GNU General Public License for more details. |
| tonymudd | 0:fb8b6da96a8b | 18 | * |
| tonymudd | 0:fb8b6da96a8b | 19 | * You should have received a copy of the GNU General Public License |
| tonymudd | 0:fb8b6da96a8b | 20 | * along with DebugTrace. If not, see <http://www.gnu.org/licenses/>. |
| tonymudd | 0:fb8b6da96a8b | 21 | */ |
| tonymudd | 0:fb8b6da96a8b | 22 | |
| tonymudd | 0:fb8b6da96a8b | 23 | #include "DebugTrace.h" |
| tonymudd | 0:fb8b6da96a8b | 24 | #include <mbed.h> |
| tonymudd | 0:fb8b6da96a8b | 25 | #include <stdarg.h> |
| tonymudd | 0:fb8b6da96a8b | 26 | #include <string.h> |
| tonymudd | 0:fb8b6da96a8b | 27 | |
| tonymudd | 0:fb8b6da96a8b | 28 | Serial logSerial(USBTX, USBRX); |
| tonymudd | 0:fb8b6da96a8b | 29 | LocalFileSystem local("local"); |
| tonymudd | 0:fb8b6da96a8b | 30 | |
| tonymudd | 0:fb8b6da96a8b | 31 | const char* FILE_PATH = "/local/"; |
| tonymudd | 0:fb8b6da96a8b | 32 | const char* EXTN = ".bak"; |
| tonymudd | 0:fb8b6da96a8b | 33 | |
| tonymudd | 0:fb8b6da96a8b | 34 | DebugTrace::DebugTrace(eLog on, eLogTarget mode, const char* fileName, int maxSize) : |
| tonymudd | 0:fb8b6da96a8b | 35 | enabled(on), logMode(mode), maxFileSize(maxSize), currentFileSize(0), |
| tonymudd | 0:fb8b6da96a8b | 36 | logFileStatus(0) |
| tonymudd | 0:fb8b6da96a8b | 37 | { |
| tonymudd | 0:fb8b6da96a8b | 38 | // allocate memory for file name strings |
| tonymudd | 0:fb8b6da96a8b | 39 | int str_size = (strlen(fileName) + strlen(FILE_PATH) + strlen(EXTN) + 1) * sizeof(char); |
| tonymudd | 0:fb8b6da96a8b | 40 | logFile = (char*)malloc(str_size); |
| tonymudd | 0:fb8b6da96a8b | 41 | logFileBackup = (char*)malloc(str_size); |
| tonymudd | 0:fb8b6da96a8b | 42 | |
| tonymudd | 0:fb8b6da96a8b | 43 | // add path to log file name |
| tonymudd | 0:fb8b6da96a8b | 44 | strcpy(logFile, FILE_PATH); |
| tonymudd | 0:fb8b6da96a8b | 45 | strcat(logFile, fileName); |
| tonymudd | 0:fb8b6da96a8b | 46 | |
| tonymudd | 0:fb8b6da96a8b | 47 | // create backup file name |
| tonymudd | 0:fb8b6da96a8b | 48 | strcpy(logFileBackup, logFile); |
| tonymudd | 0:fb8b6da96a8b | 49 | strcpy(logFileBackup, strtok(logFileBackup, ".")); |
| tonymudd | 0:fb8b6da96a8b | 50 | strcat(logFileBackup, EXTN); |
| tonymudd | 0:fb8b6da96a8b | 51 | } |
| tonymudd | 0:fb8b6da96a8b | 52 | |
| tonymudd | 0:fb8b6da96a8b | 53 | DebugTrace::~DebugTrace() |
| tonymudd | 0:fb8b6da96a8b | 54 | { |
| tonymudd | 0:fb8b6da96a8b | 55 | // dust to dust, ashes to ashes |
| tonymudd | 0:fb8b6da96a8b | 56 | if (logFile != NULL) free(logFile); |
| tonymudd | 0:fb8b6da96a8b | 57 | if (logFileBackup != NULL) free(logFileBackup); |
| tonymudd | 0:fb8b6da96a8b | 58 | } |
| tonymudd | 0:fb8b6da96a8b | 59 | |
| tonymudd | 0:fb8b6da96a8b | 60 | void DebugTrace::clear() |
| tonymudd | 0:fb8b6da96a8b | 61 | { |
| tonymudd | 0:fb8b6da96a8b | 62 | // don't care about whether these fail |
| tonymudd | 0:fb8b6da96a8b | 63 | remove(logFile); |
| tonymudd | 0:fb8b6da96a8b | 64 | remove(logFileBackup); |
| tonymudd | 0:fb8b6da96a8b | 65 | } |
| tonymudd | 0:fb8b6da96a8b | 66 | |
| tonymudd | 0:fb8b6da96a8b | 67 | void DebugTrace::backupLog() |
| tonymudd | 0:fb8b6da96a8b | 68 | { |
| tonymudd | 0:fb8b6da96a8b | 69 | // delete previous backup file |
| tonymudd | 0:fb8b6da96a8b | 70 | if (remove(logFileBackup)) |
| tonymudd | 0:fb8b6da96a8b | 71 | { |
| tonymudd | 0:fb8b6da96a8b | 72 | // standard copy stuff |
| tonymudd | 0:fb8b6da96a8b | 73 | char ch; |
| tonymudd | 0:fb8b6da96a8b | 74 | FILE* to = fopen(logFileBackup, "wb"); |
| tonymudd | 0:fb8b6da96a8b | 75 | if (NULL != to) |
| tonymudd | 0:fb8b6da96a8b | 76 | { |
| tonymudd | 0:fb8b6da96a8b | 77 | FILE* from = fopen(logFile, "rb"); |
| tonymudd | 0:fb8b6da96a8b | 78 | if (NULL != from) |
| tonymudd | 0:fb8b6da96a8b | 79 | { |
| tonymudd | 0:fb8b6da96a8b | 80 | while(!feof(from)) |
| tonymudd | 0:fb8b6da96a8b | 81 | { |
| tonymudd | 0:fb8b6da96a8b | 82 | ch = fgetc(from); |
| tonymudd | 0:fb8b6da96a8b | 83 | if (ferror(from)) break; |
| tonymudd | 0:fb8b6da96a8b | 84 | |
| tonymudd | 0:fb8b6da96a8b | 85 | if(!feof(from)) fputc(ch, to); |
| tonymudd | 0:fb8b6da96a8b | 86 | if (ferror(to)) break; |
| tonymudd | 0:fb8b6da96a8b | 87 | } |
| tonymudd | 0:fb8b6da96a8b | 88 | } |
| tonymudd | 0:fb8b6da96a8b | 89 | |
| tonymudd | 0:fb8b6da96a8b | 90 | if (NULL != from) fclose(from); |
| tonymudd | 0:fb8b6da96a8b | 91 | if (NULL != to) fclose(to); |
| tonymudd | 0:fb8b6da96a8b | 92 | } |
| tonymudd | 0:fb8b6da96a8b | 93 | } |
| tonymudd | 0:fb8b6da96a8b | 94 | |
| tonymudd | 0:fb8b6da96a8b | 95 | // now delete the log file, so we are ready to start again |
| tonymudd | 0:fb8b6da96a8b | 96 | // even if backup creation failed - the show must go on! |
| tonymudd | 0:fb8b6da96a8b | 97 | logFileStatus = remove(logFile); |
| tonymudd | 0:fb8b6da96a8b | 98 | } |
| tonymudd | 0:fb8b6da96a8b | 99 | |
| tonymudd | 0:fb8b6da96a8b | 100 | void DebugTrace::traceOut(const char* fmt, ...) |
| tonymudd | 0:fb8b6da96a8b | 101 | { |
| tonymudd | 0:fb8b6da96a8b | 102 | if (enabled) |
| tonymudd | 0:fb8b6da96a8b | 103 | { |
| tonymudd | 0:fb8b6da96a8b | 104 | va_list ap; // argument list pointer |
| tonymudd | 0:fb8b6da96a8b | 105 | va_start(ap, fmt); |
| tonymudd | 0:fb8b6da96a8b | 106 | |
| tonymudd | 0:fb8b6da96a8b | 107 | if (TO_SERIAL == logMode) |
| tonymudd | 0:fb8b6da96a8b | 108 | { |
| tonymudd | 0:fb8b6da96a8b | 109 | vfprintf(logSerial, fmt, ap); |
| tonymudd | 0:fb8b6da96a8b | 110 | } |
| tonymudd | 0:fb8b6da96a8b | 111 | else // TO_FILE |
| tonymudd | 0:fb8b6da96a8b | 112 | { |
| tonymudd | 0:fb8b6da96a8b | 113 | if (0 == logFileStatus) // otherwise we failed to remove a full log file |
| tonymudd | 0:fb8b6da96a8b | 114 | { |
| tonymudd | 0:fb8b6da96a8b | 115 | // Write data to file. Note the file size may go over limit |
| tonymudd | 0:fb8b6da96a8b | 116 | // as we check total size afterwards, using the size written to file. |
| tonymudd | 0:fb8b6da96a8b | 117 | // This is not a big issue, as this mechanism is only here |
| tonymudd | 0:fb8b6da96a8b | 118 | // to stop the file growing unchecked. Just remember log file sizes may |
| tonymudd | 0:fb8b6da96a8b | 119 | // be some what over (as apposed to some what under), so don't push it |
| tonymudd | 0:fb8b6da96a8b | 120 | // with the max file size. |
| tonymudd | 0:fb8b6da96a8b | 121 | FILE* fp = fopen(logFile, "a"); |
| tonymudd | 0:fb8b6da96a8b | 122 | if (NULL == fp) |
| tonymudd | 0:fb8b6da96a8b | 123 | { |
| tonymudd | 0:fb8b6da96a8b | 124 | va_end(ap); |
| tonymudd | 0:fb8b6da96a8b | 125 | return; |
| tonymudd | 0:fb8b6da96a8b | 126 | } |
| tonymudd | 0:fb8b6da96a8b | 127 | int size_written = vfprintf(fp, fmt, ap); |
| tonymudd | 0:fb8b6da96a8b | 128 | fclose(fp); |
| tonymudd | 0:fb8b6da96a8b | 129 | |
| tonymudd | 0:fb8b6da96a8b | 130 | // check if we are over the max file size |
| tonymudd | 0:fb8b6da96a8b | 131 | // if so backup file and start again |
| tonymudd | 0:fb8b6da96a8b | 132 | currentFileSize += size_written; |
| tonymudd | 0:fb8b6da96a8b | 133 | if (currentFileSize >= maxFileSize) |
| tonymudd | 0:fb8b6da96a8b | 134 | { |
| tonymudd | 0:fb8b6da96a8b | 135 | backupLog(); |
| tonymudd | 0:fb8b6da96a8b | 136 | currentFileSize = 0; |
| tonymudd | 0:fb8b6da96a8b | 137 | } |
| tonymudd | 0:fb8b6da96a8b | 138 | } |
| tonymudd | 0:fb8b6da96a8b | 139 | } |
| tonymudd | 0:fb8b6da96a8b | 140 | |
| tonymudd | 0:fb8b6da96a8b | 141 | va_end(ap); |
| tonymudd | 0:fb8b6da96a8b | 142 | } |
| tonymudd | 0:fb8b6da96a8b | 143 | } |