text: /**
    ******************************************************************************
    * @file    FreeRTOS\FreeRTOS_Timers\Src\main.c
    * @author  MCD Application Team
    * @brief   Main program body
    ******************************************************************************
    * @attention
    *
    * Copyright (c) 2016 STMicroelectronics International N.V. All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without 
    * modification, are permitted, provided that the following conditions are met:
    *
    * 1. Redistribution of source code must retain the above copyright notice, 
    *    this list of conditions and the following disclaimer.
    * 2. Redistributions in binary form must reproduce the above copyright notice,
    *    this list of conditions and the following disclaimer in the documentation
    *    and/or other materials provided with the distribution.
    * 3. Neither the name of STMicroelectronics nor the names of other 
    *    contributors to this software may be used to endorse or promote products 
    *    derived from this software without specific written permission.
    * 4. This software, including modifications and/or derivative works of this 
    *    software, must execute solely and exclusively on microcontroller or
    *    microprocessor devices manufactured by or for STMicroelectronics.
    * 5. Redistribution and use of this software other than as permitted under 
    *    this license is void and will automatically terminate your rights under 
    *    this license. 
    *
    * THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS" 
    * AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT 
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
    * PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
    * RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT 
    * SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
    * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
    * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
    * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
    * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
    * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "main.h"
  #include "cmsis_os.h"
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  static void osTimerCallback(void const *argument);
  static void ToggleLEDsThread(void const *argument);
  void SystemClock_Config(void);
  
  /* Private functions ---------------------------------------------------------*/
  
  /**
    * @brief  Main program
    * @param  None
    * @retval None
    */
  int main(void)
  {
    /* STM32L0xx HAL library initialization:
         - Configure the Flash prefetch, Flash preread and Buffer caches
         - Systick timer is configured by default as source of time base, but user 
               can eventually implement his proper time base source (a general purpose 
               timer for example or other time source), keeping in mind that Time base 
               duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
               handled in milliseconds basis.
         - Low Level Initialization
       */
    HAL_Init();
  
    /* Configure the System clock to 2 MHz */
    SystemClock_Config();
  
    /* Initialize LEDs */
    BSP_LED_Init(LED3);
    BSP_LED_Init(LED4);
  
    /* Create Timer */
    osTimerDef(LEDTimer, osTimerCallback);
    osTimerId osTimer = osTimerCreate(osTimer(LEDTimer), osTimerPeriodic, NULL);
    /* Start Timer */
    osTimerStart(osTimer, 200);
  
    /* Create LED Thread */
    osThreadDef(LEDThread, ToggleLEDsThread, osPriorityNormal, 0, configMINIMAL_STACK_SIZE);
    osThreadCreate(osThread(LEDThread), NULL);
  
    /* Start scheduler */
    osKernelStart();
  
    /* We should never get here as control is now taken by the scheduler */
    for (;;);
  
  }
  
  /**
    * @brief  Timer Callback that toggle LED3
    * @param  argument not used
    * @retval None
    */
  static void osTimerCallback(void const *argument)
  {
    (void) argument;
  
    /* Toggle LED3*/
    BSP_LED_Toggle(LED3);
  }
  
  /**
    * @brief  Toggle LED4 thread
    * @param  argument not used
    * @retval None
    */
  static void ToggleLEDsThread(void const *argument)
  {
    (void) argument;
  
    for (;;)
    {
      /* Toggle LED4 each 400ms */
      BSP_LED_Toggle(LED4);
  
      osDelay(400);
    }
  }
  
  /**
    * @brief  System Clock Configuration
    *         The system Clock is configured as follow : 
    *            System Clock source            = MSI
    *            SYSCLK(Hz)                     = 2000000
    *            HCLK(Hz)                       = 2000000
    *            AHB Prescaler                  = 1
    *            APB1 Prescaler                 = 1
    *            APB2 Prescaler                 = 1
    *            Flash Latency(WS)              = 0
    *            Main regulator output voltage  = Scale3 mode
    * @retval None
    */
  void SystemClock_Config(void)
  {
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    
    /* Enable MSI Oscillator */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
    RCC_OscInitStruct.MSIState = RCC_MSI_ON;
    RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_5;
    RCC_OscInitStruct.MSICalibrationValue=0x00;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
    {
      /* Initialization Error */
      while(1); 
    }
    
    /* Select MSI as system clock source and configure the HCLK, PCLK1 and PCLK2 
       clocks dividers */
    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;  
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;  
    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0)!= HAL_OK)
    {
      /* Initialization Error */
      while(1); 
    }
    /* Enable Power Control clock */
    __HAL_RCC_PWR_CLK_ENABLE();
    
    /* The voltage scaling allows optimizing the power consumption when the device is 
       clocked below the maximum system frequency, to update the voltage scaling value 
       regarding system frequency refer to product datasheet.  */
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);
    
    /* Disable Power Control clock */
    __HAL_RCC_PWR_CLK_DISABLE();
    
  }
  
  
  #ifdef  USE_FULL_ASSERT
  
  /**
    * @brief  Reports the name of the source file and the source line number
    *   where the assert_param error has occurred.
    * @param  file: pointer to the source file name
    * @param  line: assert_param error line source number
    * @retval None
    */
  void assert_failed(uint8_t *file, uint32_t line)
  {
    /* User can add his own implementation to report the file name and line number,
       ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  
    /* Infinite loop */
    while (1)
    {}
  }
  #endif
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  