fu yu / Watchdog

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Fork of Watchdog by David Smart

Watchdog.h@7:62ff05394448, 2016-11-01 (annotated)

Committer:
dragyu
Date:
Tue Nov 01 14:27:59 2016 +0000
Revision:
7:62ff05394448
Parent:
6:e0f547e22dd5 
watch dog

Who changed what in which revision?

UserRevisionLine numberNew contents of line
WiredHome 0:7a316f14da9c 1 /// @file Watchdog.h provides the interface to the Watchdog module
WiredHome 0:7a316f14da9c 2 ///
WiredHome 0:7a316f14da9c 3 /// This provides basic Watchdog service for the mbed. You can configure
WiredHome 0:7a316f14da9c 4 /// various timeout intervals that meet your system needs. Additionally,
WiredHome 0:7a316f14da9c 5 /// it is possible to identify if the Watchdog was the cause of any
WiredHome 2:2873f068f325 6 /// system restart, permitting the application code to take appropriate
WiredHome 2:2873f068f325 7 /// behavior.
WiredHome 0:7a316f14da9c 8 ///
WiredHome 0:7a316f14da9c 9 /// Adapted from Simon's Watchdog code from http://mbed.org/forum/mbed/topic/508/
WiredHome 0:7a316f14da9c 10 ///
WiredHome 6:e0f547e22dd5 11 /// @note Copyright © 2011,2015 by Smartware Computing, all rights reserved.
WiredHome 0:7a316f14da9c 12 /// This software may be used to derive new software, as long as
WiredHome 0:7a316f14da9c 13 /// this copyright statement remains in the source file.
WiredHome 0:7a316f14da9c 14 /// @author David Smart
WiredHome 0:7a316f14da9c 15 ///
WiredHome 2:2873f068f325 16 /// History
WiredHome 5:2dad2a78ffbd 17 /// \li v2.00 - 20150315: Enhanced beyond TARGET_LPC1768 to TARGET_LPC4088, TARGET_STM
WiredHome 2:2873f068f325 18 /// \li v1.00 - 20110616: initial release with some documentation improvements
WiredHome 2:2873f068f325 19 ///
WiredHome 0:7a316f14da9c 20 #ifndef WATCHDOG_H
WiredHome 0:7a316f14da9c 21 #define WATCHDOG_H
WiredHome 0:7a316f14da9c 22 #include "mbed.h"
WiredHome 0:7a316f14da9c 23
WiredHome 2:2873f068f325 24 /// The Watchdog class provides the interface to the Watchdog feature
WiredHome 2:2873f068f325 25 ///
WiredHome 2:2873f068f325 26 /// Embedded programs, by their nature, are usually unattended. If things
WiredHome 2:2873f068f325 27 /// go wrong, it is usually important that the system attempts to recover.
WiredHome 2:2873f068f325 28 /// Aside from robust software, a hardware watchdog can monitor the
WiredHome 2:2873f068f325 29 /// system and initiate a system reset when appropriate.
WiredHome 2:2873f068f325 30 ///
WiredHome 2:2873f068f325 31 /// This Watchdog is patterned after one found elsewhere on the mbed site,
WiredHome 2:2873f068f325 32 /// however this one also provides a method for the application software
WiredHome 2:2873f068f325 33 /// to determine the cause of the reset - watchdog or otherwise.
WiredHome 0:7a316f14da9c 34 ///
WiredHome 5:2dad2a78ffbd 35 /// Supports:
WiredHome 5:2dad2a78ffbd 36 /// \li TARGET_LPC1768
WiredHome 5:2dad2a78ffbd 37 /// \li TARGET_LPC4088
WiredHome 5:2dad2a78ffbd 38 /// \li TARGET_STM
WiredHome 5:2dad2a78ffbd 39 ///
WiredHome 0:7a316f14da9c 40 /// example:
WiredHome 0:7a316f14da9c 41 /// @code
WiredHome 0:7a316f14da9c 42 /// Watchdog wd;
WiredHome 0:7a316f14da9c 43 ///
WiredHome 0:7a316f14da9c 44 /// ...
WiredHome 0:7a316f14da9c 45 /// main() {
WiredHome 0:7a316f14da9c 46 /// if (wd.WatchdogCausedReset())
WiredHome 2:2873f068f325 47 /// pc.printf("Watchdog caused reset.\r\n");
WiredHome 0:7a316f14da9c 48 ///
WiredHome 2:2873f068f325 49 /// wd.Configure(3.0); // sets the timeout interval
WiredHome 0:7a316f14da9c 50 /// for (;;) {
WiredHome 1:5a1ff72b5915 51 /// wd.Service(); // kick the dog before the timeout
WiredHome 2:2873f068f325 52 /// // do other work
WiredHome 2:2873f068f325 53 /// }
WiredHome 2:2873f068f325 54 /// }
WiredHome 0:7a316f14da9c 55 /// @endcode
WiredHome 0:7a316f14da9c 56 ///
WiredHome 0:7a316f14da9c 57 class Watchdog {
WiredHome 0:7a316f14da9c 58 public:
WiredHome 0:7a316f14da9c 59 /// Create a Watchdog object
WiredHome 0:7a316f14da9c 60 ///
WiredHome 0:7a316f14da9c 61 /// example:
WiredHome 0:7a316f14da9c 62 /// @code
WiredHome 0:7a316f14da9c 63 /// Watchdog wd; // placed before main
WiredHome 0:7a316f14da9c 64 /// @endcode
WiredHome 0:7a316f14da9c 65 Watchdog();
WiredHome 0:7a316f14da9c 66
WiredHome 0:7a316f14da9c 67 /// Configure the timeout for the Watchdog
WiredHome 0:7a316f14da9c 68 ///
WiredHome 0:7a316f14da9c 69 /// This configures the Watchdog service and starts it. It must
WiredHome 0:7a316f14da9c 70 /// be serviced before the timeout, or the system will be restarted.
WiredHome 0:7a316f14da9c 71 ///
WiredHome 0:7a316f14da9c 72 /// example:
WiredHome 0:7a316f14da9c 73 /// @code
WiredHome 0:7a316f14da9c 74 /// ...
WiredHome 0:7a316f14da9c 75 /// wd.Configure(1.4); // configure for a 1.4 second timeout
WiredHome 0:7a316f14da9c 76 /// ...
WiredHome 0:7a316f14da9c 77 /// @endcode
WiredHome 0:7a316f14da9c 78 ///
WiredHome 4:22c5c4aa4661 79 /// @param[in] timeout in seconds, as a floating point number
WiredHome 0:7a316f14da9c 80 /// @returns none
WiredHome 0:7a316f14da9c 81 ///
WiredHome 0:7a316f14da9c 82 void Configure(float timeout);
dragyu 7:62ff05394448 83 void Configure(int pr);
WiredHome 0:7a316f14da9c 84 /// Service the Watchdog so it does not cause a system reset
WiredHome 0:7a316f14da9c 85 ///
WiredHome 1:5a1ff72b5915 86 /// example:
WiredHome 1:5a1ff72b5915 87 /// @code
WiredHome 1:5a1ff72b5915 88 /// wd.Service();
WiredHome 1:5a1ff72b5915 89 /// @endcode
WiredHome 0:7a316f14da9c 90 /// @returns none
WiredHome 0:7a316f14da9c 91 void Service();
WiredHome 0:7a316f14da9c 92
WiredHome 0:7a316f14da9c 93 /// WatchdogCausedReset identifies if the cause of the system
WiredHome 0:7a316f14da9c 94 /// reset was the Watchdog
WiredHome 0:7a316f14da9c 95 ///
WiredHome 0:7a316f14da9c 96 /// example:
WiredHome 0:7a316f14da9c 97 /// @code
WiredHome 0:7a316f14da9c 98 /// if (wd.WatchdogCausedReset())) {
WiredHome 0:7a316f14da9c 99 /// @endcode
WiredHome 0:7a316f14da9c 100 ///
WiredHome 0:7a316f14da9c 101 /// @returns true if the Watchdog was the cause of the reset
WiredHome 0:7a316f14da9c 102 bool WatchdogCausedReset();
WiredHome 0:7a316f14da9c 103 private:
WiredHome 0:7a316f14da9c 104 bool wdreset;
WiredHome 0:7a316f14da9c 105 };
WiredHome 0:7a316f14da9c 106
WiredHome 0:7a316f14da9c 107 #endif // WATCHDOG_H