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Watchdog.cpp@3:5959d3d35221, 2014-10-04 (annotated)
- Committer:
- WiredHome
- Date:
- Sat Oct 04 17:58:04 2014 +0000
- Revision:
- 3:5959d3d35221
- Parent:
- 2:2873f068f325
- Child:
- 5:ea5595e2698b
No code change, trying to force an update to the documentation to properly show the wd.service api.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
WiredHome | 2:2873f068f325 | 1 | /// @file Watchdog.cpp provides the interface to the Watchdog module |
WiredHome | 2:2873f068f325 | 2 | /// |
WiredHome | 2:2873f068f325 | 3 | /// This provides basic Watchdog service for the mbed. You can configure |
WiredHome | 2:2873f068f325 | 4 | /// various timeout intervals that meet your system needs. Additionally, |
WiredHome | 2:2873f068f325 | 5 | /// it is possible to identify if the Watchdog was the cause of any |
WiredHome | 2:2873f068f325 | 6 | /// system restart. |
WiredHome | 2:2873f068f325 | 7 | /// |
WiredHome | 2:2873f068f325 | 8 | /// Adapted from Simon's Watchdog code from http://mbed.org/forum/mbed/topic/508/ |
WiredHome | 2:2873f068f325 | 9 | /// |
WiredHome | 2:2873f068f325 | 10 | /// @note Copyright © 2011 by Smartware Computing, all rights reserved. |
WiredHome | 2:2873f068f325 | 11 | /// This software may be used to derive new software, as long as |
WiredHome | 2:2873f068f325 | 12 | /// this copyright statement remains in the source file. |
WiredHome | 2:2873f068f325 | 13 | /// @author David Smart |
WiredHome | 2:2873f068f325 | 14 | /// |
WiredHome | 0:7a316f14da9c | 15 | #include "mbed.h" |
WiredHome | 0:7a316f14da9c | 16 | #include "Watchdog.h" |
WiredHome | 0:7a316f14da9c | 17 | |
WiredHome | 0:7a316f14da9c | 18 | |
WiredHome | 0:7a316f14da9c | 19 | /// Watchdog gets instantiated at the module level |
WiredHome | 0:7a316f14da9c | 20 | Watchdog::Watchdog() { |
WiredHome | 2:2873f068f325 | 21 | wdreset = (LPC_WDT->WDMOD >> 2) & 1; // capture the cause of the previous reset |
WiredHome | 0:7a316f14da9c | 22 | } |
WiredHome | 0:7a316f14da9c | 23 | |
WiredHome | 0:7a316f14da9c | 24 | /// Load timeout value in watchdog timer and enable |
WiredHome | 0:7a316f14da9c | 25 | void Watchdog::Configure(float s) { |
WiredHome | 0:7a316f14da9c | 26 | LPC_WDT->WDCLKSEL = 0x1; // Set CLK src to PCLK |
WiredHome | 0:7a316f14da9c | 27 | uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4 |
WiredHome | 2:2873f068f325 | 28 | LPC_WDT->WDTC = (uint32_t)(s * (float)clk); |
WiredHome | 0:7a316f14da9c | 29 | LPC_WDT->WDMOD = 0x3; // Enabled and Reset |
WiredHome | 0:7a316f14da9c | 30 | Service(); |
WiredHome | 0:7a316f14da9c | 31 | } |
WiredHome | 0:7a316f14da9c | 32 | |
WiredHome | 0:7a316f14da9c | 33 | /// "Service", "kick" or "feed" the dog - reset the watchdog timer |
WiredHome | 0:7a316f14da9c | 34 | /// by writing this required bit pattern |
WiredHome | 0:7a316f14da9c | 35 | void Watchdog::Service() { |
WiredHome | 0:7a316f14da9c | 36 | LPC_WDT->WDFEED = 0xAA; |
WiredHome | 0:7a316f14da9c | 37 | LPC_WDT->WDFEED = 0x55; |
WiredHome | 0:7a316f14da9c | 38 | } |
WiredHome | 0:7a316f14da9c | 39 | |
WiredHome | 0:7a316f14da9c | 40 | /// get the flag to indicate if the watchdog causes the reset |
WiredHome | 0:7a316f14da9c | 41 | bool Watchdog::WatchdogCausedReset() { |
WiredHome | 0:7a316f14da9c | 42 | return wdreset; |
WiredHome | 0:7a316f14da9c | 43 | } |
WiredHome | 0:7a316f14da9c | 44 | |
WiredHome | 0:7a316f14da9c | 45 |