Let the button disable blinking

main.c

@@ -95,12 +95,9 @@ void exti0_isr (void) {
 	// NB: For some reason it is at the begining in the examples
 	// It needs to be here (possibly because of reordering, when this was at the end, I usually got the interrupt twice).
 	
-	if (!running) {
+	// Toggle TIM6 in order to disable blinking
-		direction = FORWARD;
+	// Code inspired by libopencm3 source, since we cannot read the status otherwise…
-	} else {
+	TIM_CR1(TIM6) ^= TIM_CR1_CEN;
-		direction = direction == FORWARD ? BACKWARD : FORWARD;
-	}
-	running = true;
 }
 
 void tim6_isr (void) {