path: root/Projects/NUCLEO-WB15CC/Examples_LL/LPTIM/LPTIM_PulseCounter_Init/Src/main.c

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    Examples_LL/LPTIM/LPTIM_PulseCounter_Init/Src/main.c
  * @author  MCD Application Team
  * @brief   This example describes how to use the LPTIM in counter mode
  *          using the STM32WBxx LPTIM LL API.
  *          Peripheral initialization done using LL initialization function.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2019-2021 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* 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 ---------------------------------------------------------*/

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void PeriphCommonClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_LPTIM1_Init(void);
/* USER CODE BEGIN PFP */
void Enable_LSI(void);
void EnterStop1Mode(void);
/* 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 */

  /* USER CODE END 1 */

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

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */

  NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

  /* System interrupt init*/

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

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

/* Configure the peripherals common clocks */
  PeriphCommonClock_Config();

  /* USER CODE BEGIN SysInit */

  /* Enable the LSI Clock */
  Enable_LSI();

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_LPTIM1_Init();
  /* USER CODE BEGIN 2 */

  /* Enter STOP 1 mode */
  EnterStop1Mode();

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

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

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
  while(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_3)
  {
  }

  /* HSI configuration and activation */
  LL_RCC_HSI_Enable();
  while(LL_RCC_HSI_IsReady() != 1)
  {
  }

  LL_RCC_LSI1_Enable();

  /* Wait till LSI is ready */
  while(LL_RCC_LSI1_IsReady() != 1)
  {
  }

  /* MSI configuration and activation */
  LL_RCC_MSI_Enable();
  while(LL_RCC_MSI_IsReady() != 1)
  {
  }

  /* Main PLL configuration and activation */
  LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_MSI, LL_RCC_PLLM_DIV_1, 32, LL_RCC_PLLR_DIV_2);
  LL_RCC_PLL_Enable();
  LL_RCC_PLL_EnableDomain_SYS();
  while(LL_RCC_PLL_IsReady() != 1)
  {
  }

  /* Sysclk activation on the main PLL */
  /* Set CPU1 prescaler*/
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);

  /* Set CPU2 prescaler*/
  LL_C2_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_2);

  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
  {
  }

  /* Set AHB SHARED prescaler*/
  LL_RCC_SetAHB4Prescaler(LL_RCC_SYSCLK_DIV_1);

  /* Set APB1 prescaler*/
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);

  /* Set APB2 prescaler*/
  LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);

  LL_Init1msTick(64000000);

  /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(64000000);
}

/**
  * @brief Peripherals Common Clock Configuration
  * @retval None
  */
void PeriphCommonClock_Config(void)
{
  LL_RCC_SetSMPSClockSource(LL_RCC_SMPS_CLKSOURCE_HSI);
  LL_RCC_SetSMPSPrescaler(LL_RCC_SMPS_DIV_1);
  LL_RCC_SetRFWKPClockSource(LL_RCC_RFWKP_CLKSOURCE_NONE);
  /* USER CODE BEGIN Smps */

  /* USER CODE END Smps */
}

/**
  * @brief LPTIM1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_LPTIM1_Init(void)
{

  /* USER CODE BEGIN LPTIM1_Init 0 */

  /* USER CODE END LPTIM1_Init 0 */

  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  LL_RCC_SetLPTIMClockSource(LL_RCC_LPTIM1_CLKSOURCE_LSI);

  /* Peripheral clock enable */
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_LPTIM1);

  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
  /**LPTIM1 GPIO Configuration
  PB5   ------> LPTIM1_IN1
  */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_5;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_DOWN;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_1;
  LL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /* LPTIM1 interrupt Init */
  NVIC_SetPriority(LPTIM1_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
  NVIC_EnableIRQ(LPTIM1_IRQn);

  /* USER CODE BEGIN LPTIM1_Init 1 */

  /* LPTIM1 interrupts set-up */
  /* Enable the Autoreload match Interrupt */
  LL_LPTIM_EnableIT_ARRM(LPTIM1);

  /* USER CODE END LPTIM1_Init 1 */
  LL_LPTIM_SetClockSource(LPTIM1, LL_LPTIM_CLK_SOURCE_INTERNAL);
  LL_LPTIM_SetPrescaler(LPTIM1, LL_LPTIM_PRESCALER_DIV1);
  LL_LPTIM_SetPolarity(LPTIM1, LL_LPTIM_OUTPUT_POLARITY_REGULAR);
  LL_LPTIM_SetUpdateMode(LPTIM1, LL_LPTIM_UPDATE_MODE_IMMEDIATE);
  LL_LPTIM_SetCounterMode(LPTIM1, LL_LPTIM_COUNTER_MODE_EXTERNAL);
  LL_LPTIM_ConfigClock(LPTIM1, LL_LPTIM_CLK_FILTER_NONE, LL_LPTIM_CLK_POLARITY_RISING);
  LL_LPTIM_TrigSw(LPTIM1);
  LL_LPTIM_SetInput1Src(LPTIM1, LL_LPTIM_INPUT1_SRC_GPIO);
  LL_LPTIM_SetInput2Src(LPTIM1, LL_LPTIM_INPUT2_SRC_GPIO);
  /* USER CODE BEGIN LPTIM1_Init 2 */

  /* Enable the LPTIM1 counter */
  LL_LPTIM_Enable(LPTIM1);

  /* Set the Autoreload value */
  LL_LPTIM_SetAutoReload(LPTIM1, 1000);

  /* Start the LPTIM counter in continuous mode */
  LL_LPTIM_StartCounter(LPTIM1, LL_LPTIM_OPERATING_MODE_CONTINUOUS);

  /* USER CODE END LPTIM1_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);

  /**/
  LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);

  /**/
  GPIO_InitStruct.Pin = LED2_Pin;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
  LL_GPIO_Init(LED2_GPIO_Port, &GPIO_InitStruct);

}

/* USER CODE BEGIN 4 */

/**
  * @brief  Enable Internal Low Speed Clock (LSI)
  * @param  None
  * @retval Status
  */
void Enable_LSI(void)
{
  /* Enable LSI Oscillator */
  LL_RCC_LSI1_Enable();
  
  while(LL_RCC_LSI1_IsReady() != 1) 
  {
  };
}

/**
  * @brief  Function to configure and enter in STOP 1 Mode.
  * @param  None
  * @retval None
  */
void EnterStop1Mode(void)
{
  /* Set low-power mode "Stop" */
  LL_PWR_SetPowerMode(LL_PWR_MODE_STOP1);
  
  /* Set low-power mode "Stop" of CPU2 */
  /* Note: On STM32WB, both CPU1 and CPU2 must be in stop mode to set the entire system in stop mode */
  LL_C2_PWR_SetPowerMode(LL_PWR_MODE_STOP1);
  /* Set SLEEPDEEP bit of Cortex System Control Register */
  LL_LPM_EnableDeepSleep();

  /* Request Wait For Interrupt */
  __WFI();
}


/******************************************************************************/
/*   USER IRQ HANDLER TREATMENT                                               */
/******************************************************************************/
/**
  * @brief  LPTimer Autoreload match interrupt processing
  * @param  None
  * @retval None
  */
void LPTimerAutoreloadMatch_Callback(void)
{
  LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);  
}

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
 
  /* USER CODE END Error_Handler_Debug */
}

#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 CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  while (1)
  {
  }

  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */