328 lines
9.2 KiB
C
328 lines
9.2 KiB
C
/**
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******************************************************************************
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* @file Examples_LL/PWR/PWR_EnterStandbyMode/Src/main.c
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* @author MCD Application Team
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* @brief This example describes how to enter and exit the standby mode with
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* a wakeup pin or external reset through the STM32F1xx PWR LL API.
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "main.h"
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/** @addtogroup STM32F1xx_LL_Examples
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* @{
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*/
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/** @addtogroup PWR_EnterStandbyMode
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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#define BUTTON_MODE_GPIO 0
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#define BUTTON_MODE_EXTI 1
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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uint32_t LedSpeed = LED_BLINK_FAST;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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void Configure_PWR(void);
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void LED_Init(void);
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void LED_Blinking(uint32_t Period);
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void UserButton_Init(uint32_t Button_Mode);
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uint32_t UserButton_GetState(void);
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void EnterStandbyMode(void);
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Main program
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* @param None
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* @retval None
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*/
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int main(void)
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{
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/* Configure the system clock to 72 MHz */
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SystemClock_Config();
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/* Initialize LED2 */
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LED_Init();
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/* Initialize User push-button in GPIO mode */
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UserButton_Init(BUTTON_MODE_GPIO);
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/* Configure Power IP */
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Configure_PWR();
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/* Initialize User push-button in EXTI mode */
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UserButton_Init(BUTTON_MODE_EXTI);
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/* Led blinking in RUN mode */
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LED_Blinking(LedSpeed);
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/* Infinite loop */
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while (1)
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{
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}
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}
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/**
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* @brief Initialize LED2.
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* @param None
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* @retval None
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*/
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void LED_Init(void)
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{
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/* Enable the LED2 Clock */
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LED2_GPIO_CLK_ENABLE();
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/* Configure IO in output push-pull mode to drive external LED2 */
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LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
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/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
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//LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
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/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
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//LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
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/* Reset value is LL_GPIO_PULL_NO */
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//LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
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}
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/**
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* @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
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* @param Period : Period of time (in ms) between each toggling of LED
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* This parameter can be user defined values. Pre-defined values used in that example are :
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* @arg LED_BLINK_FAST : Fast Blinking
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* @arg LED_BLINK_SLOW : Slow Blinking
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* @arg LED_BLINK_ERROR : Error specific Blinking
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* @retval None
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*/
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void LED_Blinking(uint32_t Period)
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{
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/* Toggle IO in an infinite loop */
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while (1)
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{
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LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
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LL_mDelay(Period);
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}
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}
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/**
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* @brief Configures User push-button in GPIO or EXTI Line Mode.
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* @param ButtonMode: Specifies Button mode.
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* This parameter can be one of following parameters:
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* @arg BUTTON_MODE_GPIO: Button will be used as simple IO
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* @arg BUTTON_MODE_EXTI: Button will be connected to EXTI line with interrupt
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* generation capability
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* @retval None
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*/
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void UserButton_Init(uint32_t Button_Mode)
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{
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/* Enable the BUTTON Clock */
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USER_BUTTON_GPIO_CLK_ENABLE();
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/* Configure GPIO for BUTTON */
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LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
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if(Button_Mode == BUTTON_MODE_EXTI)
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{
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/* Connect External Line to the GPIO*/
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USER_BUTTON_SYSCFG_SET_EXTI();
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/* Enable a rising trigger EXTI line 13 Interrupt */
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USER_BUTTON_EXTI_LINE_ENABLE();
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USER_BUTTON_EXTI_RISING_TRIG_ENABLE();
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/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
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NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
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NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
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}
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}
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/**
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* @brief Returns the selected Button state.
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* @param None
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* @retval The Button GPIO pin value.
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*/
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uint32_t UserButton_GetState(void)
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{
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return LL_GPIO_IsInputPinSet(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN);
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}
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/**
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* @brief Function to configure and initialize PWR IP.
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* @param None
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* @retval None
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*/
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void Configure_PWR(void)
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{
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/* Enable Power Clock */
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LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
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/* Check if the system was resumed from StandBy mode */
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if (LL_PWR_IsActiveFlag_SB() != 0)
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{
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/* Clear Standby flag */
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LL_PWR_ClearFlag_SB();
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/* Change LED speed to SLOW to indicate exit from standby mode */
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LedSpeed = LED_BLINK_SLOW;
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}
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/* Check and Clear the Wakeup flag */
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if (LL_PWR_IsActiveFlag_WU() != 0)
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{
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LL_PWR_ClearFlag_WU();
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}
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}
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/**
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* @brief Function to configure and enter in STANDBY Mode.
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* @param None
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* @retval None
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*/
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void EnterStandbyMode(void)
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{
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/* Wait that user release the User push-button */
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while(UserButton_GetState() == 0){}
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/* Disable all used wakeup sources */
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LL_PWR_DisableWakeUpPin(LL_PWR_WAKEUP_PIN1);
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/* Clear all wake up Flag */
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LL_PWR_ClearFlag_WU();
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/* Enable wakeup pin */
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LL_PWR_EnableWakeUpPin(LL_PWR_WAKEUP_PIN1);
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/* As default User push-button state is high level, need to clear all wake up Flag again */
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LL_PWR_ClearFlag_WU();
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/** Request to enter STANDBY mode
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* Following procedure describe in STM32F1xx Reference Manual
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* See PWR part, section Low-power modes, Standby mode
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*/
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/* Set STANDBY mode when CPU enters deepsleep */
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LL_PWR_SetPowerMode(LL_PWR_MODE_STANDBY);
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/* Set SLEEPDEEP bit of Cortex System Control Register */
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LL_LPM_EnableDeepSleep();
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/* This option is used to ensure that store operations are completed */
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#if defined ( __CC_ARM)
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__force_stores();
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#endif
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/* Request Wait For Interrupt */
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__WFI();
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}
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/**
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* @brief System Clock Configuration
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSE)
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* SYSCLK(Hz) = 72000000
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* HCLK(Hz) = 72000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 2
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* APB2 Prescaler = 1
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* HSE Frequency(Hz) = 8000000
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* PLLMUL = 9
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* Flash Latency(WS) = 2
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* @param None
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* @retval None
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*/
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void SystemClock_Config(void)
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{
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/* Set FLASH latency */
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LL_FLASH_SetLatency(LL_FLASH_LATENCY_2);
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/* Enable HSE oscillator */
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LL_RCC_HSE_EnableBypass();
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LL_RCC_HSE_Enable();
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while(LL_RCC_HSE_IsReady() != 1)
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{
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};
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/* Main PLL configuration and activation */
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LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE_DIV_1, LL_RCC_PLL_MUL_9);
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LL_RCC_PLL_Enable();
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while(LL_RCC_PLL_IsReady() != 1)
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{
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};
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/* Sysclk activation on the main PLL */
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LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
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LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
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while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
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{
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};
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/* Set APB1 & APB2 prescaler*/
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LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
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LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
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/* Set systick to 1ms in using frequency set to 72MHz */
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LL_Init1msTick(72000000);
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/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
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LL_SetSystemCoreClock(72000000);
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}
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/******************************************************************************/
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/* USER IRQ HANDLER TREATMENT */
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/******************************************************************************/
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/**
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* @brief Function to manage BUTTON IRQ Handler
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* @param None
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* @retval None
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*/
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void UserButton_Callback(void)
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{
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/* Configure and enter in STANDBY Mode */
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EnterStandbyMode();
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/* Here Device is in STANDBY mode */
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}
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#ifdef USE_FULL_ASSERT
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void assert_failed(uint8_t *file, uint32_t line)
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{
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/* User can add his own implementation to report the file name and line number,
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ex: printf("Wrong parameters value: file %s on line %d", file, line) */
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/* Infinite loop */
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while (1)
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{
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}
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}
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#endif
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/**
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* @}
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*/
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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