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/**
******************************************************************************
* @file Examples_LL/TIM/TIM_TimeBase/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use a timer instance to generate a
* time base using the STM32F4xx TIM 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 TIM_TimeBase
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define BUTTON_MODE_GPIO 0
#define BUTTON_MODE_EXTI 1
/* Number of time base frequencies */
#define TIM_BASE_FREQ_NB 10
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Initial autoreload value */
static uint32_t InitialAutoreload = 0;
/* Actual autoreload value multiplication factor */
static uint8_t AutoreloadMult = 1;
/* TIM2 Clock */
static uint32_t TimOutClock = 1;
/* Private function prototypes -----------------------------------------------*/
__STATIC_INLINE void SystemClock_Config(void);
__STATIC_INLINE void Configure_TIMTimeBase(void);
__STATIC_INLINE void LED_Init(void);
__STATIC_INLINE void UserButton_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();
/* Initialize button in EXTI mode */
UserButton_Init();
/* Configure the timer time base */
Configure_TIMTimeBase();
/* Infinite loop */
while (1)
{
}
}
/**
* @brief Configures the timer as a time base.
* @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
*/
__STATIC_INLINE void Configure_TIMTimeBase(void)
{
/* Enable the timer peripheral clock */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM2);
/* Set counter mode */
/* Reset value is LL_TIM_COUNTERMODE_UP */
//LL_TIM_SetCounterMode(TIM2, LL_TIM_COUNTERMODE_UP);
/* Set the pre-scaler value to have TIM2 counter clock equal to 10 kHz */
/*
In this example TIM2 input clock (TIM2CLK) is set to APB1 clock (PCLK1),
since APB1 prescaler is equal to 1.
TIM2CLK = PCLK1
PCLK1 = HCLK
=> TIM2CLK = HCLK = SystemCoreClock
To get TIM2 counter clock at 10 KHz, the Prescaler is computed as following:
Prescaler = (TIM2CLK / TIM2 counter clock) - 1
Prescaler = (SystemCoreClock /10 KHz) - 1
*/
LL_TIM_SetPrescaler(TIM2, __LL_TIM_CALC_PSC(SystemCoreClock, 10000));
/* Set the auto-reload value to have an initial update event frequency of 10 Hz */
/* TIM2CLK = SystemCoreClock / (APB prescaler & multiplier) */
TimOutClock = SystemCoreClock/2;
InitialAutoreload = __LL_TIM_CALC_ARR(TimOutClock, LL_TIM_GetPrescaler(TIM2), 10);
LL_TIM_SetAutoReload(TIM2, InitialAutoreload);
/* Enable the update interrupt */
LL_TIM_EnableIT_UPDATE(TIM2);
/* Configure the NVIC to handle TIM2 update interrupt */
NVIC_SetPriority(TIM2_IRQn, 0);
NVIC_EnableIRQ(TIM2_IRQn);
/* Enable counter */
LL_TIM_EnableCounter(TIM2);
/* Force update generation */
LL_TIM_GenerateEvent_UPDATE(TIM2);
}
/**
* @brief Initialize LED2.
* @param None
* @retval None
*/
__STATIC_INLINE 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 Configures User push-button in GPIO or EXTI Line Mode.
* @param None
* @retval None
*/
__STATIC_INLINE void UserButton_Init(void)
{
/* Enable the BUTTON Clock */
USER_BUTTON_GPIO_CLK_ENABLE();
/* Configure GPIO for BUTTON */
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_NO);
/* Connect External Line to the GPIO*/
USER_BUTTON_SYSCFG_SET_EXTI();
/* Enable a rising trigger EXTI line 13 Interrupt */
USER_BUTTON_EXTI_LINE_ENABLE();
USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
}
/**
* @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 Update the timer update event period
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
/* Change the update event period by modifying the autoreload value. */
/* In up-counting update event is generated at each counter overflow (when */
/* the counter reaches the auto-reload value). */
/* Update event period is calculated as follows: */
/* Update_event = TIM2CLK /((PSC + 1)*(ARR + 1)*(RCR + 1)) */
/* where TIM2CLK is 100 MHz */
AutoreloadMult = AutoreloadMult % TIM_BASE_FREQ_NB;
LL_TIM_SetAutoReload(TIM2, InitialAutoreload * (AutoreloadMult +1));
/* Force update generation */
LL_TIM_GenerateEvent_UPDATE(TIM2);
AutoreloadMult++;
}
/**
* @brief Timer update interrupt processing
* @param None
* @retval None
*/
void TimerUpdate_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
/**
* @}
*/
/**
* @}
*/
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