Watchdog lib for LPC1768
Fork of Watchdog by
Watchdog.h@7:093e74b9c2c8, 2018-01-09 (annotated)
- Committer:
- bramkelder
- Date:
- Tue Jan 09 10:45:36 2018 +0000
- Revision:
- 7:093e74b9c2c8
- Parent:
- 6:e0f547e22dd5
removed unneeded boards
Who changed what in which revision?
User | Revision | Line number | New 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); |
WiredHome | 0:7a316f14da9c | 83 | |
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 |