Diff: WakeUp_LPC11u24.cpp

Revision:

4:ec26a6713bb9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WakeUp_LPC11u24.cpp	Sun Jan 12 14:58:22 2014 +0000
@@ -0,0 +1,63 @@
+/**
+Due to lack of another option for the LPC11u24 the watchdog timer is used as wakeup source.
+Since if the reset on watchdog event bit is set, I cannot remove it again, this means if you also got watchdog code running
+the most likely result is that it just resets your board.
+**/
+
+
+#ifdef TARGET_LPC11U24
+
+#include "WakeUp.h"
+
+FunctionPointer WakeUp::callback;
+float WakeUp::cycles_per_ms = 5.0;
+
+void WakeUp::set_ms(uint32_t ms)
+{
+    if (ms != 0) {
+        LPC_SYSCON->SYSAHBCLKCTRL |= 0x8000;
+        LPC_SYSCON->PDRUNCFG &= ~(1<<6);
+        LPC_SYSCON->PDSLEEPCFG &= ~(1<<6);
+        LPC_SYSCON->STARTERP1 |= 1<<12;
+        
+        //Set oscillator for 20kHz = 5kHz after divide by 4 in WDT
+        LPC_SYSCON->WDTOSCCTRL = 14 | (1<<5);
+        
+        LPC_WWDT->MOD = 1;      //Enable WDT
+        LPC_WWDT->TC = (uint32_t)((float)ms * cycles_per_ms);
+        LPC_WWDT->CLKSEL = 1;   //WDTOSC
+        LPC_WWDT->WARNINT = 0;
+        
+        NVIC_SetVector(WDT_IRQn, (uint32_t)WakeUp::irq_handler);
+        
+        //Feeeeeed me
+        LPC_WWDT->FEED = 0xAA;
+        LPC_WWDT->FEED = 0x55;
+        
+        NVIC_EnableIRQ(WDT_IRQn);
+    } else
+        NVIC_DisableIRQ(WDT_IRQn);
+    
+}
+
+void WakeUp::irq_handler(void)
+{
+    LPC_WWDT->MOD = 1<<3;
+    callback.call();
+}
+
+void WakeUp::calibrate(void)
+{
+    cycles_per_ms = 5.0;
+    set_ms(1100);
+    wait_ms(10);    //Give time to sync
+    uint32_t count1 = LPC_WWDT->TV;
+    wait_ms(100);
+    uint32_t count2 = LPC_WWDT->TV;
+    set_ms(0);
+    count1 = count1 - count2;
+    
+    cycles_per_ms = count1 / 100.0;
+}
+
+#endif