Revision 0:daae6c64fbdf, committed 2012-07-24

Comitter:

tylerjw

Date:

Tue Jul 24 23:11:37 2012 +0000

Commit message:

simple watchdog

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/watchdog.cpp	Tue Jul 24 23:11:37 2012 +0000
@@ -0,0 +1,38 @@
+/* Copyright (c) 2012 Tyler Weaver, MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
+ * and associated documentation files (the "Software"), to deal in the Software without restriction, 
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or 
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "mbed.h"
+#include "watchdog.h"
+
+// Simon's Watchdog code from
+// http://mbed.org/forum/mbed/topic/508/
+
+// Load timeout value in watchdog timer and enable
+void Watchdog::kick(float s) {
+    LPC_WDT->WDCLKSEL = 0x1;                // Set CLK src to PCLK
+    uint32_t clk = SystemCoreClock / 16;    // WD has a fixed /4 prescaler, PCLK default is /4
+    LPC_WDT->WDTC = s * (float)clk;
+    LPC_WDT->WDMOD = 0x3;                   // Enabled and Reset
+    kick();
+}
+// "kick" or "feed" the dog - reset the watchdog timer
+// by writing this required bit pattern
+void Watchdog::kick() {
+    LPC_WDT->WDFEED = 0xAA;
+    LPC_WDT->WDFEED = 0x55;
+}
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/watchdog.h	Tue Jul 24 23:11:37 2012 +0000
@@ -0,0 +1,30 @@
+/* Copyright (c) 2012 Tyler Weaver, MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
+ * and associated documentation files (the "Software"), to deal in the Software without restriction, 
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or 
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "mbed.h"
+
+/**
+ Watchdog timer
+ simple implementation gotten from mbed
+ @author unknown
+*/
+class Watchdog {
+public:
+    void kick(float); // init watchdog to number of seconds
+    void kick(); // kick the dog
+};
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