Alef Sin / Watchdog

Modified version of the Watchdog library with improved support for STM32

Dependents:   LightSaber iot_water_monitor_v2

Fork of Watchdog by David Smart

Diff: Watchdog.cpp

Revision:
8:3c7d083f26b5
Parent:
7:8912bb017956
Child:
9:84f7c088c261
--- a/Watchdog.cpp	Tue Oct 27 16:02:33 2015 +0000
+++ b/Watchdog.cpp	Tue Oct 27 17:04:16 2015 +0000
@@ -95,6 +95,11 @@
     int scale = 1 + log2(s / 4096); // The RLR register is 12 bits and beyond that a prescaler should be used
     int residual = s / (1 << scale); // The value for the RLR register
     
+    if (scale > 8) {                 //STM32 allows a maximum time of around 26.2 seconds for the Watchdog timer
+        scale = 8;
+        residual = 0xFFF;
+    }
+        
     IWDG->KR  = 0x5555;         // enable write to PR, RLR
     IWDG->PR  = scale - 2;      // Prescaler has values of multiples of 4 (i.e. 2 ^2), page 486 Reference Manual
     IWDG->RLR = residual;       // Init RLR