351 lines
10 KiB
C
351 lines
10 KiB
C
/**
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******************************************************************************
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* @file Examples_LL/TIM/TIM_OutputCompare/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 in output
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* compare mode 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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* <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 TIM_OutputCompare
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Number of output compare modes */
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#define TIM_OC_MODES_NB 3
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Output compare modes */
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static uint32_t aOCMode[TIM_OC_MODES_NB] = {
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LL_TIM_OCMODE_TOGGLE,
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LL_TIM_OCMODE_ACTIVE,
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LL_TIM_OCMODE_INACTIVE
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};
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/* Output compare mode index */
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static uint8_t iOCMode = 0;
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/* Compare match count */
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static uint32_t uwCompareMatchCount = 0;
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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_TIMOutputCompare(void);
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__STATIC_INLINE void Configure_OCMode(uint32_t OCMode);
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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 button in EXTI mode */
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UserButton_Init();
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/* Configure the timer in output compare mode */
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Configure_TIMOutputCompare();
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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 to generate an output compare signal on the
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* OC1 output.
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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_TIMOutputCompare(void)
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{
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/*************************/
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/* GPIO AF configuration */
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/*************************/
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/* Enable the peripheral clock of GPIOs */
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LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOA);
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/* GPIO TIM2_CH1 configuration */
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LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_0, LL_GPIO_MODE_ALTERNATE);
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LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_0, LL_GPIO_PULL_DOWN);
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LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_0, LL_GPIO_SPEED_FREQ_HIGH);
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/***********************************************/
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/* Configure the NVIC to handle TIM2 interrupt */
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/***********************************************/
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NVIC_SetPriority(TIM2_IRQn, 0);
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NVIC_EnableIRQ(TIM2_IRQn);
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/******************************/
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/* Peripheral clocks enabling */
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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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/***************************/
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/* Time base configuration */
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/***************************/
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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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LL_TIM_SetPrescaler(TIM2, __LL_TIM_CALC_PSC(SystemCoreClock, 10000));
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/* Set the auto-reload value to have a counter frequency of 10 Hz */
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/* TIM2CLK = SystemCoreClock / (APB prescaler & multiplier) */
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TimOutClock = SystemCoreClock/2;
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LL_TIM_SetAutoReload(TIM2, __LL_TIM_CALC_ARR(TimOutClock, LL_TIM_GetPrescaler(TIM2), 10));
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/*********************************/
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/* Output waveform configuration */
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/*********************************/
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/* Set output compare mode: TOGGLE */
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LL_TIM_OC_SetMode(TIM2, LL_TIM_CHANNEL_CH1, LL_TIM_OCMODE_TOGGLE);
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/* Set output channel polarity: OC is active high */
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LL_TIM_OC_SetPolarity(TIM2, LL_TIM_CHANNEL_CH1, LL_TIM_OCPOLARITY_HIGH);
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/* Set output compare active/inactive delay to half of the auto-reload value */
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LL_TIM_OC_SetCompareCH1(TIM2, (LL_TIM_GetAutoReload(TIM2) / 2));
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/**************************/
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/* TIM2 interrupts set-up */
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/**************************/
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/* Enable the capture/compare interrupt for channel 1*/
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LL_TIM_EnableIT_CC1(TIM2);
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/**********************************/
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/* Start output signal generation */
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/**********************************/
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/* Enable output channel 1 */
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LL_TIM_CC_EnableChannel(TIM2, LL_TIM_CHANNEL_CH1);
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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 Changes the output compare mode.
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* @param None
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* @retval None
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*/
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__STATIC_INLINE void Configure_OCMode(uint32_t OCMode)
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{
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/* Disable the counter */
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LL_TIM_DisableCounter(TIM2);
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/* Reset the counter */
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LL_TIM_SetCounter(TIM2, 0);
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/* Reset the compare match count */
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uwCompareMatchCount = 0;
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/* Set the output level (active v.s. inactive) according to the new OC mode */
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switch (OCMode)
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{
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case LL_TIM_OCMODE_TOGGLE:
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case LL_TIM_OCMODE_ACTIVE:
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/* Set the output channel to its inactive level (LOW)*/
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LL_TIM_OC_SetMode(TIM2, LL_TIM_CHANNEL_CH1, LL_TIM_OCMODE_FORCED_INACTIVE);
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break;
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case LL_TIM_OCMODE_INACTIVE:
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/* Set the output channel to its active level (HIGH)*/
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LL_TIM_OC_SetMode(TIM2, LL_TIM_CHANNEL_CH1, LL_TIM_OCMODE_FORCED_ACTIVE);
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break;
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default:
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break;
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}
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/* Update the output channel mode */
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LL_TIM_OC_SetMode(TIM2, LL_TIM_CHANNEL_CH1, OCMode);
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/* Re-enable the counter */
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LL_TIM_EnableCounter(TIM2);
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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 User button interrupt processing
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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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/* Set new OC mode */
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iOCMode = (iOCMode + 1) % TIM_OC_MODES_NB;
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/* Switch to next OC mode */
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Configure_OCMode(aOCMode[iOCMode]);
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}
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/**
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* @brief Timer capture/compare interrupt processing
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* @note The capture/compare interrupt is generated whatever the compare
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* mode is (as long as the timer counter is enabled).
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* @param None
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* @retval None
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*/
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void TimerCaptureCompare_Callback(void)
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{
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/* Upon compare match, the counter value should be equal to the */
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/* capture/compare register (TIMx_CCRx) value. */
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if(LL_TIM_GetCounter(TIM2) == LL_TIM_OC_GetCompareCH1(TIM2))
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{
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/* Increment the compare match count */
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uwCompareMatchCount++;
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}
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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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