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/**
******************************************************************************
* @file Examples_LL/LPTIM/LPTIM_PulseCounter/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use the LPTIM in counter mode
* using the STM32F4xx LPTIM LL API.
* Peripheral initialization done using LL unitary services functions.
******************************************************************************
* @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 LPTIM_PulseCounter
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Enable_LSI(void);
void Configure_LPTIMCounter(void);
void EnterStop1Mode(void);
void LED_Init(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();
/* Enable the LSI Clock */
Enable_LSI();
/* Configures LPTIM1 in counter mode */
Configure_LPTIMCounter();
/* Enter STOP 1 mode */
EnterStop1Mode();
/* Infinite loop */
while (1)
{
}
}
/**
* @brief Enable Internal Low Speed Clock (LSI)
* @param None
* @retval Status
*/
void Enable_LSI(void)
{
/* Enable LSI Oscillator */
LL_RCC_LSI_Enable();
while(LL_RCC_LSI_IsReady() != 1)
{
};
}
/**
* @brief Configures the LPTIM1 instance in counter mode.
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @param None
* @retval None
*/
void Configure_LPTIMCounter(void)
{
/***************************************/
/* Select LSI as LPTIM1 clock source */
/***************************************/
LL_RCC_SetLPTIMClockSource(LL_RCC_LPTIM1_CLKSOURCE_LSI);
/*************************/
/* GPIO AF configuration */
/*************************/
/* Enable the peripheral clock of GPIOs */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOC);
/* GPIO LPTIM1_IN1 configuration */
LL_GPIO_SetPinMode(GPIOC, LL_GPIO_PIN_0, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetPinPull(GPIOC, LL_GPIO_PIN_0, LL_GPIO_PULL_DOWN);
LL_GPIO_SetPinSpeed(GPIOC, LL_GPIO_PIN_0, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetAFPin_0_7(GPIOC, LL_GPIO_PIN_0, LL_GPIO_AF_1);
/*************************************************/
/* Configure the NVIC to handle LPTIM1 interrupt */
/*************************************************/
NVIC_SetPriority(LPTIM1_IRQn, 0);
NVIC_EnableIRQ(LPTIM1_IRQn);
/******************************/
/* Peripheral clocks enabling */
/******************************/
/* Enable the timer peripheral clock */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_LPTIM1);
/****************************/
/* LPTIM1 interrupts set-up */
/****************************/
/* LPTIM1 Interrupt Configuration: EXTI configuration */
LL_EXTI_EnableIT_0_31(LL_EXTI_LINE_23);
LL_EXTI_EnableRisingTrig_0_31(LL_EXTI_LINE_23);
/* Clear LPTIM1 autoreload match flag */
LL_LPTIM_ClearFLAG_ARRM(LPTIM1);
/* Enable the Autoreload match Interrupt */
LL_LPTIM_EnableIT_ARRM(LPTIM1);
/*****************************/
/* LPTIM1 configuration */
/*****************************/
/* Set the source of the clock used by the LPTIM instance */
//LL_LPTIM_SetClockSource(LPTIM1, LL_LPTIM_CLK_SOURCE_INTERNAL);
/* Set actual prescaler division ratio */
//LL_LPTIM_SetPrescaler(LPTIM1, LL_LPTIM_PRESCALER_DIV1);
/* Configure the LPTIM instance output */
//LL_LPTIM_ConfigOutput(LPTIM1, LL_LPTIM_OUTPUT_WAVEFORM_PWM, LL_LPTIM_OUTPUT_POLARITY_REGULAR);
/* The counter is incremented following each valid clock pulse on the LPTIM external Input1 */
LL_LPTIM_SetCounterMode(LPTIM1, LL_LPTIM_COUNTER_MODE_EXTERNAL);
/*****************************/
/* Enable the LPTIM1 counter */
/*****************************/
LL_LPTIM_Enable(LPTIM1);
/****************************/
/* Set the Autoreload value */
/****************************/
LL_LPTIM_SetAutoReload(LPTIM1, 1000);
/************************/
/* Start LPTIM1 counter */
/************************/
/* Start the LPTIM counter in continuous mode */
LL_LPTIM_StartCounter(LPTIM1, LL_LPTIM_OPERATING_MODE_CONTINUOUS);
}
/**
* @brief Function to configure and enter in STOP 1 Mode.
* @param None
* @retval None
*/
void EnterStop1Mode(void)
{
/* Enter STOP 1 mode */
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 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 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;
}
/******************************************************************************/
/* 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);
}
#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
/**
* @}
*/
/**
* @}
*/