297 lines
8.9 KiB
C
297 lines
8.9 KiB
C
/**
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******************************************************************************
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* @file Examples_LL/TIM/TIM_TimeBase/Src/main.c
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* @author MCD Application Team
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* @brief This example describes how to use a timer instance to generate a
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* time base using the STM32F1xx TIM LL API.
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* Peripheral initialization done using LL unitary services functions.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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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 TIM_TimeBase
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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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/* Number of time base frequencies */
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#define TIM_BASE_FREQ_NB 10
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Initial autoreload value */
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static uint32_t InitialAutoreload = 0;
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/* Actual autoreload value multiplication factor */
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static uint8_t AutoreloadMult = 1;
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/* TIM2 Clock */
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static uint32_t TimOutClock = 1;
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/* Private function prototypes -----------------------------------------------*/
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__STATIC_INLINE void SystemClock_Config(void);
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__STATIC_INLINE void Configure_TIMTimeBase(void);
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__STATIC_INLINE void LED_Init(void);
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__STATIC_INLINE void UserButton_Init(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 button in EXTI mode */
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UserButton_Init();
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/* Configure the timer time base */
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Configure_TIMTimeBase();
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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 Configures the timer as a time base.
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* @note Peripheral configuration is minimal configuration from reset values.
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* Thus, some useless LL unitary functions calls below are provided as
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* commented examples - setting is default configuration from reset.
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* @param None
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* @retval None
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*/
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__STATIC_INLINE void Configure_TIMTimeBase(void)
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{
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/* Enable the timer peripheral clock */
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LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM2);
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/* Set counter mode */
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/* Reset value is LL_TIM_COUNTERMODE_UP */
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//LL_TIM_SetCounterMode(TIM2, LL_TIM_COUNTERMODE_UP);
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/* Set the pre-scaler value to have TIM2 counter clock equal to 10 kHz */
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/*
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In this example TIM2 input clock (TIM2CLK) is set to APB1 clock (PCLK1),
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since APB1 prescaler is equal to 1.
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TIM2CLK = PCLK1
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PCLK1 = HCLK
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=> TIM2CLK = HCLK = SystemCoreClock
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To get TIM2 counter clock at 10 KHz, the Prescaler is computed as following:
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Prescaler = (TIM2CLK / TIM2 counter clock) - 1
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Prescaler = (SystemCoreClock /10 KHz) - 1
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*/
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LL_TIM_SetPrescaler(TIM2, __LL_TIM_CALC_PSC(SystemCoreClock, 10000));
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/* Set the auto-reload value to have an initial update event frequency of 10 Hz */
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/* TIM2CLK = SystemCoreClock / (APB prescaler & multiplier) */
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TimOutClock = SystemCoreClock/2;
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InitialAutoreload = __LL_TIM_CALC_ARR(TimOutClock, LL_TIM_GetPrescaler(TIM2), 10);
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LL_TIM_SetAutoReload(TIM2, InitialAutoreload);
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/* Enable the update interrupt */
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LL_TIM_EnableIT_UPDATE(TIM2);
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/* Configure the NVIC to handle TIM2 update interrupt */
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NVIC_SetPriority(TIM2_IRQn, 0);
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NVIC_EnableIRQ(TIM2_IRQn);
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/* Enable counter */
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LL_TIM_EnableCounter(TIM2);
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/* Force update generation */
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LL_TIM_GenerateEvent_UPDATE(TIM2);
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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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__STATIC_INLINE 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 Configures User push-button in GPIO or EXTI Line Mode.
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* @param None
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* @retval None
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*/
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__STATIC_INLINE void UserButton_Init(void)
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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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LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_DOWN);
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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_FALLING_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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* @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 Update the timer update event period
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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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/* Change the update event period by modifying the autoreload value. */
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/* In up-counting update event is generated at each counter overflow (when */
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/* the counter reaches the auto-reload value). */
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/* Update event period is calculated as follows: */
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/* Update_event = TIM2CLK /((PSC + 1)*(ARR + 1)*(RCR + 1)) */
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/* where TIM2CLK is 72 MHz */
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AutoreloadMult = AutoreloadMult % TIM_BASE_FREQ_NB;
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LL_TIM_SetAutoReload(TIM2, InitialAutoreload * (AutoreloadMult +1));
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/* Force update generation */
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LL_TIM_GenerateEvent_UPDATE(TIM2);
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AutoreloadMult++;
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}
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/**
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* @brief Timer update interrupt processing
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* @param None
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* @retval None
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*/
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void TimerUpdate_Callback(void)
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{
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LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
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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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