344 lines
11 KiB
C
344 lines
11 KiB
C
/**
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******************************************************************************
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* @file Examples_LL/TIM/TIM_PWMOutput/Src/main.c
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* @author MCD Application Team
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* @brief This example describes how to use a timer peripheral to generate a
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* PWM output signal and update PWM duty cycle
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* 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_PWMOutput
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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_DUTY_CYCLES_NB 11
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Duty cycles: D = T/P * 100% */
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/* where T is the pulse duration and P the period of the PWM signal */
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static uint32_t aDutyCycle[TIM_DUTY_CYCLES_NB] = {
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0, /* 0% */
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10, /* 10% */
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20, /* 20% */
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30, /* 30% */
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40, /* 40% */
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50, /* 50% */
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60, /* 60% */
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70, /* 70% */
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80, /* 80% */
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90, /* 90% */
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100, /* 100% */
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};
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/* Duty cycle index */
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static uint8_t iDutyCycle = 0;
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/* Measured duty cycle */
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__IO uint32_t uwMeasuredDutyCycle = 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_TIMPWMOutput(void);
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__STATIC_INLINE void Configure_DutyCycle(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_TIMPWMOutput();
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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 a PWM signal on the 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_TIMPWMOutput(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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/* Enable TIM2_ARR register preload. Writing to or reading from the */
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/* auto-reload register accesses the preload register. The content of the */
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/* preload register are transferred into the shadow register at each update */
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/* event (UEV). */
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LL_TIM_EnableARRPreload(TIM2);
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/* Set the auto-reload value to have a counter frequency of 100 Hz */
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/* TIM2CLK = SystemCoreClock / (APB prescaler & multiplier) */
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TimOutClock = SystemCoreClock/1;
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LL_TIM_SetAutoReload(TIM2, __LL_TIM_CALC_ARR(TimOutClock, LL_TIM_GetPrescaler(TIM2), 100));
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/*********************************/
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/* Output waveform configuration */
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/*********************************/
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/* Set output mode */
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/* Reset value is LL_TIM_OCMODE_FROZEN */
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LL_TIM_OC_SetMode(TIM2, LL_TIM_CHANNEL_CH1, LL_TIM_OCMODE_PWM1);
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/* Set output channel polarity */
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/* Reset value is LL_TIM_OCPOLARITY_HIGH */
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//LL_TIM_OC_SetPolarity(TIM2, LL_TIM_CHANNEL_CH1, LL_TIM_OCPOLARITY_HIGH);
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/* Set compare value to half of the counter period (50% duty cycle ) */
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LL_TIM_OC_SetCompareCH1(TIM2, ( (LL_TIM_GetAutoReload(TIM2) + 1 ) / 2));
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/* Enable TIM2_CCR1 register preload. Read/Write operations access the */
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/* preload register. TIM2_CCR1 preload value is loaded in the active */
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/* at each update event. */
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LL_TIM_OC_EnablePreload(TIM2, LL_TIM_CHANNEL_CH1);
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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 duty cycle of the PWM signal.
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* D = (T/P)*100
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* where T is the pulse duration and P is the PWM signal period
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* @param D Duty cycle
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* @retval None
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*/
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__STATIC_INLINE void Configure_DutyCycle(uint32_t D)
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{
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uint32_t P; /* Pulse duration */
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uint32_t T; /* PWM signal period */
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/* PWM signal period is determined by the value of the auto-reload register */
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T = LL_TIM_GetAutoReload(TIM2) + 1;
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/* Pulse duration is determined by the value of the compare register. */
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/* Its value is calculated in order to match the requested duty cycle. */
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P = (D*T)/100;
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LL_TIM_OC_SetCompareCH1(TIM2, P);
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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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* @note When the user key button is pressed the PWM duty cycle is updated.
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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 duty cycle */
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iDutyCycle = (iDutyCycle + 1) % TIM_DUTY_CYCLES_NB;
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/* Change PWM signal duty cycle */
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Configure_DutyCycle(aDutyCycle[iDutyCycle]);
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}
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/**
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* @brief Timer capture/compare interrupt processing
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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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uwMeasuredDutyCycle = (LL_TIM_OC_GetCompareCH1(TIM2) * 100) / ( LL_TIM_GetAutoReload(TIM2) + 1 );
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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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