Diff: Watchdog.cpp

Revision:

17:ccd155378a9b

Parent:

15:e0e4c2268558

Child:

18:edfbf294c9e2

--- a/Watchdog.cpp	Sun Feb 25 13:36:35 2018 +0000
+++ b/Watchdog.cpp	Thu Mar 15 10:31:54 2018 +0000
@@ -85,6 +85,67 @@
 bool Watchdog::WatchdogCausedReset() {
     return _wdreset;
 }
+
+#elif defined(TARGET_LPC81X) || defined(TARGET_LPC82X)
+// from Gesotec Gesotec
+/// Watchdog gets instantiated at the module level
+Watchdog::Watchdog()
+{
+    _wdreset = (LPC_WWDT->MOD >> 2) & 1;    // capture the cause of the previous reset
+}
+ 
+/// Load timeout value in watchdog timer and enable
+void Watchdog::Configure(float s)
+{
+    Configure((int)(s * 1000));
+}
+
+void Watchdog::Configure(int ms)
+{
+    uint32_t wdt_osc = 0;
+    
+    /* Determine clock frequency according to clock register values             */
+    switch ((LPC_SYSCON->WDTOSCCTRL >> 5) & 0x0F)
+    {
+        case 0:  wdt_osc =       0; break;
+        case 1:  wdt_osc =  500000; break;
+        case 2:  wdt_osc =  800000; break;
+        case 3:  wdt_osc = 1100000; break;
+        case 4:  wdt_osc = 1400000; break;
+        case 5:  wdt_osc = 1600000; break;
+        case 6:  wdt_osc = 1800000; break;
+        case 7:  wdt_osc = 2000000; break;
+        case 8:  wdt_osc = 2200000; break;
+        case 9:  wdt_osc = 2400000; break;
+        case 10: wdt_osc = 2600000; break;
+        case 11: wdt_osc = 2700000; break;
+        case 12: wdt_osc = 2900000; break;
+        case 13: wdt_osc = 3100000; break;
+        case 14: wdt_osc = 3200000; break;
+        case 15: wdt_osc = 3400000; break;
+    }
+    wdt_osc /= ((LPC_SYSCON->WDTOSCCTRL & 0x1F) << 1) + 2;
+
+    uint32_t clk = wdt_osc / 4;    // WD has a fixed /4 prescaler, and a 500khz oscillator
+    LPC_WWDT->TC = (ms * clk) / 1000;
+    LPC_WWDT->MOD = 0x3;                   // Enabled and Reset
+    Service();
+}
+
+/// "Service", "kick" or "feed" the dog - reset the watchdog timer
+/// by writing this required bit pattern
+void Watchdog::Service()
+{
+    LPC_WWDT->FEED = 0xAA;
+    LPC_WWDT->FEED = 0x55;
+}
+ 
+/// get the flag to indicate if the watchdog causes the reset
+bool Watchdog::WatchdogCausedReset()
+{
+    return _wdreset;
+}
+
 #elif defined(TARGET_STM)
 Watchdog::Watchdog()
 {