Merge remote-tracking branch 'PaulStoffregen/master'

teensy3/DMAChannel.cpp

 #include "DMAChannel.h"
 
+#if DMA_NUM_CHANNELS > 16
+#undef DMA_NUM_CHANNELS
+#define DMA_NUM_CHANNELS 16
+#endif
+
 
 // The channel allocation bitmask is accessible from "C" namespace,
 // so C-only code can reserve DMA channels
 	__disable_irq();
 	dma_channel_allocated_mask &= ~(1 << channel);
 	__enable_irq();
-	channel = 16;
+	channel = DMA_NUM_CHANNELS;
 	TCD = (TCD_t *)0;
 }
 

teensy3/IntervalTimer.h

 	nvic_priority = n;
 	if (PIT_enabled) NVIC_SET_PRIORITY(IRQ_PIT_CH, n);
     }
+    operator IRQ_NUMBER_t() {
+        if (PIT_enabled) {
+#if defined(KINETISK)
+            return (IRQ_NUMBER_t)(IRQ_PIT_CH + PIT_id);
+#elif defined(KINETISL)
+            return IRQ_PIT;
+#endif
+        }
+        return (IRQ_NUMBER_t)NVIC_NUM_INTERRUPTS;
+    }
 #if defined(KINETISK)
     friend void pit0_isr();
     friend void pit1_isr();