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/**
******************************************************************************
* @file Examples_LL/PWR/PWR_EnterStopMode/Src/main.c
* @author MCD Application Team
* @brief This example describes how to enter and exit the STOP_MAINREGU mode
* through the STM32F4xx PWR LL API.
******************************************************************************
* @attention
*
* Copyright (c) 2017 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.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup PWR_EnterStopMode
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Configure_PWR(void);
void LED_Init(void);
void LED_Off(void);
void LED_Blinking_5s(void);
void EnterSTOP_MAINREGUMode(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 100 MHz */
SystemClock_Config();
/* Initialize LED2 */
LED_Init();
/* Configure Power IP */
Configure_PWR();
/* Led blinking during 5s in RUN mode */
LED_Blinking_5s();
/* Switch OFF LED2 */
LED_Off();
/* Enter STOP_MAINREGU mode */
EnterSTOP_MAINREGUMode();
/* Here Device is in STOP_MAINREGU mode */
/* Infinite loop */
while (1)
{
}
}
/**
* @brief Initialize LED2.
* @param None
* @retval None
*/
void LED_Init(void)
{
/* Enable the LED2 Clock */
LED2_GPIO_CLK_ENABLE();
/* Configure IO in output push-pull mode to drive external LED2 */
LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
//LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
//LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
/* Reset value is LL_GPIO_PULL_NO */
//LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
}
/**
* @brief Turn-off LED2.
* @param None
* @retval None
*/
void LED_Off(void)
{
/* Turn LED2 off */
LL_GPIO_ResetOutputPin(LED2_GPIO_PORT, LED2_PIN);
}
/**
* @brief Set LED2 to Blinking mode during 5s.
* @param None
* @retval None
*/
void LED_Blinking_5s(void)
{
uint32_t i = 0;
/* Toggle IO in during 5s (25*200ms) */
for(i = 0; i < 25; i++)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(200);
}
}
/**
* @brief Function to configure and initialize PWR IP.
* @param None
* @retval None
*/
void Configure_PWR(void)
{
/* Enable Power Clock */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
}
/**
* @brief Function to configure and enter in STOP_MAINREGU Mode.
* @param None
* @retval None
*/
void EnterSTOP_MAINREGUMode(void)
{
LL_GPIO_InitTypeDef gpio_initstruct = {LL_GPIO_PIN_ALL, LL_GPIO_MODE_ANALOG,
LL_GPIO_SPEED_FREQ_HIGH, LL_GPIO_OUTPUT_PUSHPULL,
LL_GPIO_PULL_NO, LL_GPIO_AF_0};
/* Set all GPIO in analog state to reduce power consumption, */
/* Note: Debug using ST-Link is not possible during the execution of this */
/* example because communication between ST-link and the device */
/* under test is done through UART. All GPIO pins are disabled (set */
/* to analog input mode) including UART I/O pins. */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA |
LL_AHB1_GRP1_PERIPH_GPIOB |
LL_AHB1_GRP1_PERIPH_GPIOC |
LL_AHB1_GRP1_PERIPH_GPIOD |
LL_AHB1_GRP1_PERIPH_GPIOE |
LL_AHB1_GRP1_PERIPH_GPIOH);
LL_GPIO_Init(GPIOA, &gpio_initstruct);
LL_GPIO_Init(GPIOB, &gpio_initstruct);
LL_GPIO_Init(GPIOC, &gpio_initstruct);
LL_GPIO_Init(GPIOD, &gpio_initstruct);
LL_GPIO_Init(GPIOE, &gpio_initstruct);
LL_GPIO_Init(GPIOH, &gpio_initstruct);
LL_AHB1_GRP1_DisableClock(LL_AHB1_GRP1_PERIPH_GPIOA |
LL_AHB1_GRP1_PERIPH_GPIOB |
LL_AHB1_GRP1_PERIPH_GPIOC |
LL_AHB1_GRP1_PERIPH_GPIOD |
LL_AHB1_GRP1_PERIPH_GPIOE |
LL_AHB1_GRP1_PERIPH_GPIOH);
/** Request to enter STOP_MAINREGU mode
* Following procedure describe in STM32F4xx Reference Manual
* See PWR part, section Low-power modes, STOP_MAINREGU mode
*/
/* Set STOP_MAINREGU mode when CPU enters deepsleep */
LL_PWR_SetPowerMode(LL_PWR_MODE_STOP_MAINREGU);
/* Set SLEEPDEEP bit of Cortex System Control Register */
LL_LPM_EnableDeepSleep();
/* Request Wait For Interrupt */
__WFI();
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 100000000
* HCLK(Hz) = 100000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 400
* PLL_P = 4
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(100000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 100000000;
}
#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", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/