working on blinki example with timer 2 interrupt... not yet working

main.c

@@ -53,7 +53,7 @@ void risingEdgeInterruptPinA1()
 	}
 }
 #endif
-void interruptLEDtoggleOnTIM1counterCompare()
+void LEDtoggleOnTimer2underflow()
 {
 	//timerInitCounter(timer_2, 0xFFFF, 0, upCounting);
 	
@@ -71,13 +71,14 @@ void interruptLEDtoggleOnTIM1counterCompare()
 	// only allow under-/overflow interrupts
 	TIM2->CR1 |= TIM_CR1_URS;
 
+	// set to count down mode
 	TIM2->CR1 |= TIM_CR1_DIR;
 
 	// set clock prescaler	
 	TIM2->PSC = 0xFFFF;
 
 	// set outo reload value	
-	TIM2->ARR = 0xFFFF;
+	TIM2->ARR = 0xFFFFFFFF;
 
 	// Enable Update Interrupt
 	TIM2->DIER |= TIM_DIER_UIE;	
@@ -122,8 +123,7 @@ int main(int argc, char *argv[])
 {
 	setup();
 
-	interruptLEDtoggleOnTIM1counterCompare();
-
+	LEDtoggleOnTimer2underflow();
 	while(1);
 
 	return 1;