diff --git a/examples/systick_irq/systick.h b/examples/systick_irq/systick.h
index e681d818f41432573f6f09283b05fcfb939ac016..8aaa3ef5e3e9a93390c38233d28d4f8e6ff1b792 100644
--- a/examples/systick_irq/systick.h
+++ b/examples/systick_irq/systick.h
@@ -29,11 +29,11 @@ void systick_init(void)
 	/* Clear any existing IRQ */
     SysTick->SR &= ~SYSTICK_SR_CNTIF;
 	
-#if 0
+#if 1
 	/* Set the tick interval to 1ms for normal op */
     SysTick->CMP = (SYSTEM_CORE_CLOCK/1000)-1;
 #else	
-	/* Set the tick interval to 100ms for debug */
+	/* Set the tick interval to 1s for debug */
     SysTick->CMP = (SYSTEM_CORE_CLOCK)-1;
 #endif
 	
@@ -49,19 +49,16 @@ void systick_init(void)
 #if 1
 /*
  * SysTick ISR just counts ticks
+ * note - the __attribute__((interrupt)) syntax is crucial!
  */
-void SysTick_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
-//void SysTick_Handler(void) __attribute__((interrupt("interrupt")));
+void SysTick_Handler(void) __attribute__((interrupt));
 void SysTick_Handler(void)
 {
 	/* clear IRQ */
-    SysTick->SR &= ~SYSTICK_SR_CNTIF;
+    SysTick->SR &= 0;
 	
 	/* update counter */
 	systick_cnt++;
-	
-	printf("systick_cnt = 0x%08X\n\r", systick_cnt);
-
 }
 #endif
 
diff --git a/examples/systick_irq/systick_irq.c b/examples/systick_irq/systick_irq.c
index db9f4c4f7c3f3c490888468ab699b10d08261040..589ed89287002e0b2a482501ff66e0195b119aa1 100644
--- a/examples/systick_irq/systick_irq.c
+++ b/examples/systick_irq/systick_irq.c
@@ -28,27 +28,21 @@ int main()
 	systick_init();
 	printf("done.\n\r");
 	
-#if 1
+#if 0
 	// Debugging - does ISR run & inc counter?
 	// this section shows that IRQs during print will reset system, but during
 	// inf while() do not.
-	//while(1)
-	//for(int i=0;i<20;i++)
-	//{
-		//printf("i = %d ", i);
-		printf("CNT = 0x%08X ", SysTick->CNT);
-		printf("systick_cnt = 0x%08X\n\r", systick_cnt);
-	//}
 	
 	// does cnt inc?
-	//uint32_t pcnt = systick_cnt;
+	uint32_t pcnt = systick_cnt;
 	while(1)
 	{
-		//if(pcnt != systick_cnt)
-		//{
-		//	printf("systick_cnt = %d\n\r", systick_cnt);
-		//	pcnt = systick_cnt;
-		//}
+		if(pcnt != systick_cnt)
+		{
+			printf("CNT = 0x%08X ", SysTick->CNT);
+			printf("systick_cnt = %d\n\r", systick_cnt);
+			pcnt = systick_cnt;
+		}
 	}
 #else
 	// Testing 1ms Systick