How to use Timers ?

@Issamos Thank you for your answers ! But I'm still very confused. HAL_TIM_GET_COUNTER() get the tim counter register value on runtime since the start of the timer with the function HAL_TIM_Base_Start(), right?  And timer_val was also set with HAL_TIM_GET_COUNTER(). So timer_val is a fixed value and HAL_TIM_Base_Start() is the one that inscrease.

Does HAL_TIM_GET_COUNTER() start at 0 when it is called in the test? Also does timer_val as for first value 0? I wonder if by the time, the timer started thanks to HAL_TIM_Base_Start() and the time the value is put in timer_val, the value of timer_val is really 0.

I'm slowly understanding but what happens when timer_val get 60000 as value? HAL_TIM_Base_Start() can't go above 65 536

Here is the full code : 

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim16;

UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_TIM16_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
 * @brief The application entry point.
 * @retval int
 */
int main(void)
{
 /* USER CODE BEGIN 1 */
 uint16_t timer_val;

 /* USER CODE END 1 */

 /* MCU Configuration--------------------------------------------------------*/

 /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
 HAL_Init();

 /* USER CODE BEGIN Init */

 /* USER CODE END Init */

 /* Configure the system clock */
 SystemClock_Config();

 /* USER CODE BEGIN SysInit */

 /* USER CODE END SysInit */

 /* Initialize all configured peripherals */
 MX_GPIO_Init();
 MX_USART2_UART_Init();
 MX_TIM16_Init();
 /* USER CODE BEGIN 2 */

 // Start timer
 HAL_TIM_Base_Start(&htim16);

 // Get current time (microseconds)
 timer_val = __HAL_TIM_GET_COUNTER(&htim16);

 /* USER CODE END 2 */

 /* Infinite loop */
 /* USER CODE BEGIN WHILE */
 while (1)
 {
 // If enough time has passed (1 second), toggle LED and get new timestamp
 if (__HAL_TIM_GET_COUNTER(&htim16) - timer_val >= 10000)
 {
 HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
 timer_val = __HAL_TIM_GET_COUNTER(&htim16);
 }

 /* USER CODE END WHILE */

 /* USER CODE BEGIN 3 */
 }
 /* USER CODE END 3 */
}

Thanks for answering @waclawek.jan 

How does timer_val go back to 0 ? From what I understood HAL_TIM_GET_COUNTER don't go above 65 536 so at what moment 

HAL_TIM_GET_COUNTER(&htim16) - timer_val) >= 10000

can happen when timer_val reached 60 000 ? 

Hello @Gnahore 

I don't have a clear answer to your question but I suggest you to close these post by choosing a best answer and copie your new request to a new post to give him more visibility.

Best regards.

II

Wow thank you a lot !