test some shits

Time between sending and receiving event :
- Waveforms : 19us
- TraceAnalyzer : 18us

main.c

@@ -19,15 +19,21 @@
 
 GPIO_InitTypeDef GPIO_InitStruct;
 
-osThreadId_t idTask1;
+osThreadId_t idTask1, idTask2;
 osEventFlagsId_t evt_id;   
 
  const osThreadAttr_t AttrTask1 = {
   .stack_size = 512,          // Create the thread stack size 
-	.priority = osPriorityNormal, //Set initial thread priority to high
+	.priority = osPriorityHigh, //Set initial thread priority to high
 	.name = "Task 1"
 };
  
+ const osThreadAttr_t AttrTask2 = {
+  .stack_size = 512,          // Create the thread stack size 
+	.priority = osPriorityNormal, //Set initial thread priority to high
+	.name = "Task 2"
+};
+ 
 void init_button(void)
 {
 	/* Configure GPIO pin: PI2 (BTN_0) as interrupt */
@@ -51,19 +57,33 @@ void EXTI2_IRQHandler(void)
 void HAL_GPIO_EXTI_Callback(uint16_t GPIO_PIN)
 {
 	//button interrupt
-	HAL_GPIO_TogglePin(GPIOF, GPIO_PIN_9);
+	HAL_GPIO_WritePin(GPIOF, GPIO_PIN_9, 1);
+	osEventFlagsSet(evt_id, 0x1U);
 }
  
 
 /*----------------------------------------------------------------------------
  * Thread 1
  *---------------------------------------------------------------------------*/
-__NO_RETURN static void taskCounter(void *argument) {
+__NO_RETURN static void task1(void *argument) {
 
 	
 	for (;;) {
-		osEventFlagsWait(evt_id);
-		osEventFlagsClear(evt_id, );
+		osEventFlagsWait(evt_id, 0x1U, osFlagsNoClear, osWaitForever);
+		HAL_GPIO_WritePin(GPIOF, GPIO_PIN_9, 0);
+	}
+}
+
+/*----------------------------------------------------------------------------
+ * Thread 2
+ *---------------------------------------------------------------------------*/
+__NO_RETURN static void task2(void *argument) {
+
+	
+	for (;;) {
+		osEventFlagsWait(evt_id, 0x1U, osFlagsNoClear, osWaitForever);
+		osEventFlagsClear(evt_id, 0x1U);
+		HAL_GPIO_WritePin(GPIOF, GPIO_PIN_9, 0);
 	}
 }
 
@@ -116,8 +136,9 @@ int main (void) {
  
   osKernelInitialize();                 // Initialize CMSIS-RTOS
 
-	idTask1 = osThreadNew(taskCounter, NULL,  &AttrTask1);
-	
+	idTask1 = osThreadNew(task1, NULL,  &AttrTask1);
+	idTask2 = osThreadNew(task2, NULL,  &AttrTask2);
+
 	//events
 	evt_id = osEventFlagsNew(NULL);