Add external hook for CPU freq.

Author: nseidle

cores/arduino/ard_sup/ap3_clock_sources.h

@@ -26,5 +26,8 @@ SOFTWARE.
 
 bool enableBurstMode();
 bool disableBurstMode();
+uint32_t getCpuFreqMHz();
+
+uint32_t cpuFreq = 48000000; //At POR core is 48MHz
 
 #endif //_AP3_GPIO_H_

cores/arduino/ard_sup/clock/ap3_clock_sources.cpp

@@ -17,6 +17,7 @@ bool enableBurstMode(void)
     {
         return (false);
     }
+    cpuFreq = 96000000;
     return (true);
 }
 
@@ -36,5 +37,12 @@ bool disableBurstMode(void)
     {
         return (false);
     }
+    cpuFreq = 48000000;
     return (true);
 }
+
+//Returns the current core speed
+uint32_t getCpuFreqMHz(void)
+{
+    return(cpuFreq);
+}