/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file Examples_LL/RCC/RCC_HWAutoMSICalibration/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use the MSI clock source HW auto
* calibration to get a precise MSI clock through
* the STM32WLxx RCC LL API.
******************************************************************************
* @attention
*
* Copyright (c) 2020 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 */
/* Define used to enable time-out management*/
#define USE_TIMEOUT 0
#if (USE_TIMEOUT == 1)
/* LSE time-out value */
#define LSE_STABILIZATION_TIMEOUT ((uint32_t)125) /* 125 ms */
#endif /* USE_TIMEOUT */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
__IO uint8_t ubButtonPress = 0;
#if (USE_TIMEOUT == 1)
uint32_t Timeout = 0; /* Variable used for Timeout management */
#endif /* USE_TIMEOUT */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */
void MSICalibration_Process(void);
void LED_On(void);
#if (USE_TIMEOUT == 1)
void LED_Blinking(uint32_t Period);
#endif /* USE_TIMEOUT */
void WaitForUserButtonPress(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. */
/* System interrupt init*/
NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
/* 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();
/* USER CODE BEGIN 2 */
/* Wait Until USER BUTTON is pressed */
/* LED blinking FAST during waiting time */
WaitForUserButtonPress();
/* Start and wait for MSI calibration */
MSICalibration_Process();
/* 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_2);
while(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_2)
{
}
LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
LL_RCC_MSI_Enable();
/* Wait till MSI is ready */
while(LL_RCC_MSI_IsReady() != 1)
{
}
LL_RCC_MSI_EnableRangeSelection();
LL_RCC_MSI_SetRange(LL_RCC_MSIRANGE_6);
LL_RCC_MSI_SetCalibTrimming(0);
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_MSI, LL_RCC_PLLM_DIV_1, 24, LL_RCC_PLLR_DIV_2);
LL_RCC_PLL_EnableDomain_SYS();
LL_RCC_PLL_Enable();
/* Wait till PLL is ready */
while(LL_RCC_PLL_IsReady() != 1)
{
}
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
/* Wait till System clock is ready */
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
}
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetAHB3Prescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
LL_Init1msTick(48000000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
LL_SetSystemCoreClock(48000000);
LL_RCC_ConfigMCO(LL_RCC_MCO1SOURCE_SYSCLK, LL_RCC_MCO1_DIV_1);
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
LL_EXTI_InitTypeDef EXTI_InitStruct = {0};
LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOA);
/**/
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);
/**/
GPIO_InitStruct.Pin = LL_GPIO_PIN_8;
GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
GPIO_InitStruct.Alternate = LL_GPIO_AF_0;
LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/**/
LL_SYSCFG_SetEXTISource(LL_SYSCFG_EXTI_PORTA, LL_SYSCFG_EXTI_LINE0);
/**/
EXTI_InitStruct.Line_0_31 = LL_EXTI_LINE_0;
EXTI_InitStruct.Line_32_63 = LL_EXTI_LINE_NONE;
EXTI_InitStruct.LineCommand = ENABLE;
EXTI_InitStruct.Mode = LL_EXTI_MODE_IT;
EXTI_InitStruct.Trigger = LL_EXTI_TRIGGER_FALLING;
LL_EXTI_Init(&EXTI_InitStruct);
/**/
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_Port, USER_BUTTON_Pin, LL_GPIO_PULL_UP);
/**/
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_Port, USER_BUTTON_Pin, LL_GPIO_MODE_INPUT);
/* EXTI interrupt init*/
NVIC_SetPriority(EXTI0_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
NVIC_EnableIRQ(EXTI0_IRQn);
}
/* USER CODE BEGIN 4 */
/**
* @brief Function to process MSI Calibration
* @param None
* @retval None
*/
void MSICalibration_Process(void)
{
/* LSE configuration and activation */
LL_PWR_EnableBkUpAccess();
/* Enable LSE */
LL_RCC_ForceBackupDomainReset();
LL_RCC_ReleaseBackupDomainReset();
LL_RCC_LSE_SetDriveCapability(LL_RCC_LSEDRIVE_LOW);
LL_RCC_LSE_Enable();
#if (USE_TIMEOUT == 1)
Timeout = LSE_STARTUP_TIMEOUT;
#endif /* USE_TIMEOUT */
while (LL_RCC_LSE_IsReady() != 1)
{
#if (USE_TIMEOUT == 1)
/* Check Systick counter flag to decrement the time-out value */
if (LL_SYSTICK_IsActiveCounterFlag())
{
if (Timeout-- == 0)
{
/* Time-out occurred. Return an error */
LED_Blinking(LED_BLINK_ERROR);
}
}
#endif /* USE_TIMEOUT */
};
/* Enable LSE system clock to use it by MSI PLL mode */
LL_RCC_LSE_EnablePropagation();
/* Wait LSE system clock ready flag*/
#if (USE_TIMEOUT == 1)
Timeout = LSE_STABILIZATION_TIMEOUT; /* Stabilization time required to wait until clock is forwarded to the system (4096 cycles)*/
#endif /* USE_TIMEOUT */
while (LL_RCC_LSE_IsPropagationReady() != 1)
{
#if (USE_TIMEOUT == 1)
/* Check Systick counter flag to decrement the time-out value */
if (LL_SYSTICK_IsActiveCounterFlag())
{
if (Timeout-- == 0)
{
/* Time-out occurred. Return an error */
LED_Blinking(LED_BLINK_ERROR);
}
}
#endif /* USE_TIMEOUT */
};
/* Enable MSI clock PLL */
LL_RCC_MSI_EnablePLLMode();
/* Calibration success*/
LED_On();
}
/**
* @brief Turn-on LED2
* @param None
* @retval None
*/
void LED_On(void)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_Port, LED2_Pin);
}
#if (USE_TIMEOUT == 1)
/**
* @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
* @param Period : Period of time (in ms) between each toggling of LED
* This parameter can be user defined values. Pre-defined values used in that example are :
* @arg LED_BLINK_FAST : Fast Blinking
* @arg LED_BLINK_SLOW : Slow Blinking
* @arg LED_BLINK_ERROR : Error specific Blinking
* @retval None
*/
void LED_Blinking(uint32_t Period)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_Port, LED2_Pin);
/* Toggle IO in an infinite loop */
while (1)
{
/* Error if LED2 is slowly blinking (1 sec. period) */
LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);
LL_mDelay(Period);
}
}
#endif /* USE_TIMEOUT */
/**
* @brief Wait for user push button press to start transfer.
* @param None
* @retval None
*/
void WaitForUserButtonPress(void)
{
while (ubButtonPress == 0)
{
/* Fast LED Toggle in waiting user action */
LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);
LL_mDelay(LED_BLINK_FAST);
}
}
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
/**
* @brief Function to manage Button push
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
ubButtonPress = 1;
}
/* 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,
ex: printf("Wrong parameters value: file %s on line %d", file, line) */
/* Infinite loop */
while (1)
{
}
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */