lzbp li / Watchdog-1

+++

Fork of Watchdog by David Smart

Watchdog.cpp@0:7a316f14da9c, 2011-03-20 (annotated)

Committer:
WiredHome
Date:
Sun Mar 20 23:22:50 2011 +0000
Revision:
0:7a316f14da9c
Child:
2:2873f068f325

        

        
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#include "mbed.h"





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#include "Watchdog.h"





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/// Watchdog gets instantiated at the module level





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Watchdog::Watchdog() {





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    wdreset = (LPC_WDT->WDMOD >> 2) & 1;





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}





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/// Load timeout value in watchdog timer and enable





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void Watchdog::Configure(float s) {





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    LPC_WDT->WDCLKSEL = 0x1;                // Set CLK src to PCLK





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    uint32_t clk = SystemCoreClock / 16;    // WD has a fixed /4 prescaler, PCLK default is /4





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    LPC_WDT->WDTC = s * (float)clk;





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    LPC_WDT->WDMOD = 0x3;                   // Enabled and Reset





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    Service();





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}





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/// "Service", "kick" or "feed" the dog - reset the watchdog timer





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/// by writing this required bit pattern





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void Watchdog::Service() {





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    LPC_WDT->WDFEED = 0xAA;





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    LPC_WDT->WDFEED = 0x55;





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}





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/// get the flag to indicate if the watchdog causes the reset





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bool Watchdog::WatchdogCausedReset() {





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    return wdreset;





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}





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