/** ****************************************************************************** * @file Examples_LL/TIM/TIM_OnePulse/Src/main.c * @author MCD Application Team * @brief This example describes how to use a timer instance in one * pulse mode through the STM32F1xx TIM LL API. * Peripheral initialization done using LL unitary services functions. ****************************************************************************** * @attention * *

© Copyright (c) 2016 STMicroelectronics. * All rights reserved.

* * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /** @addtogroup STM32F1xx_LL_Examples * @{ */ /** @addtogroup TIM_OnePulse * @{ */ /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Measured pulse delay (in us) */ __IO uint32_t uwMeasuredDelay = 0; /* Measured pulse length (in us) */ __IO uint32_t uwMeasuredPulseLength = 0; /* Private function prototypes -----------------------------------------------*/ __STATIC_INLINE void SystemClock_Config(void); __STATIC_INLINE void ConfigureTIMOnePulse_SwTrigger(void); __STATIC_INLINE void ConfigureTIMOnePulse_TI2Trigger(void); __STATIC_INLINE void UserButton_Init(void); /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None */ int main(void) { /* Configure the system clock to 72 MHz MHz */ SystemClock_Config(); /* Initialize button in EXTI mode */ UserButton_Init(); /* Configure timer instance in one pulse mode: timer counter is started by */ /* software. */ ConfigureTIMOnePulse_SwTrigger(); /* Configure timer instance in one pulse mode: timer counter is started by */ /* rising edge on the TI2 input pin. */ ConfigureTIMOnePulse_TI2Trigger(); /* Infinite loop */ while (1) { } } /** * @brief This function configures TIM3 to generate a positive pulse on OC1 * with a length of 50 us and after a delay of 50 us after enabling * the timer counter. * @note The counter is enabled every time the user presses the user button. * @note The delay and the pulse length are measured in the CC1 interrupt * service routine. * @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 ConfigureTIMOnePulse_SwTrigger(void) { /*************************/ /* GPIO AF configuration */ /*************************/ /* Enable the peripheral clock of GPIOs */ LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOA);; /* GPIO TIM3_CH1 configuration */ LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_6, LL_GPIO_MODE_ALTERNATE); LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_6, LL_GPIO_PULL_DOWN); LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_6, LL_GPIO_SPEED_FREQ_HIGH); /***********************************************/ /* Configure the NVIC to handle TIM3 interrupt */ /***********************************************/ NVIC_SetPriority(TIM3_IRQn, 0); NVIC_EnableIRQ(TIM3_IRQn); /******************************/ /* Peripheral clocks enabling */ /******************************/ /* Enable the peripheral clock of TIM3 */ LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM3); /*********************************/ /* Output waveform configuration */ /*********************************/ /* Select counter mode: counting up */ LL_TIM_SetCounterMode(TIM3, LL_TIM_COUNTERMODE_UP); /* Set the one pulse mode: generate only 1 pulse*/ LL_TIM_SetOnePulseMode(TIM3, LL_TIM_ONEPULSEMODE_SINGLE); /* Set the TIM3 prescaler to get counter clock frequency at 10 MHz */ /* In this example TIM3 input clock (TIM3CLK) is set to APB1 clock (PCLK2), */ /* since APB1 pre-scaler is equal to 1. */ /* TIM3CLK = PCLK2 */ /* PCLK2 = HCLK */ /* => TIM3CLK = SystemCoreClock (72 MHz) */ LL_TIM_SetPrescaler(TIM3, __LL_TIM_CALC_PSC(SystemCoreClock, 10000000)); /* Set the capture/compare register to get a pulse delay of 50 us */ LL_TIM_OC_SetCompareCH1(TIM3, __LL_TIM_CALC_DELAY(SystemCoreClock, LL_TIM_GetPrescaler(TIM3), 50)); /* Set the autoreload register to get a pulse length of 50s */ LL_TIM_SetAutoReload(TIM3, __LL_TIM_CALC_PULSE(SystemCoreClock, LL_TIM_GetPrescaler(TIM3), 50, 50)); /* Set output channel 1 in PWM2 mode */ LL_TIM_OC_SetMode(TIM3, LL_TIM_CHANNEL_CH1, LL_TIM_OCMODE_PWM2); /* Configure output channel 1 */ LL_TIM_OC_ConfigOutput(TIM3, LL_TIM_CHANNEL_CH1, LL_TIM_OCPOLARITY_HIGH | LL_TIM_OCIDLESTATE_LOW); /**************************/ /* TIM3 interrupts set-up */ /**************************/ /* Enable the capture/compare interrupt for channel 1 */ LL_TIM_EnableIT_CC1(TIM3); /**************************/ /* Start pulse generation */ /**************************/ /* Enable channel 1 */ LL_TIM_CC_EnableChannel(TIM3, LL_TIM_CHANNEL_CH1); /* Enable TIM3 outputs */ LL_TIM_EnableAllOutputs(TIM3); /* Enable auto-reload register preload */ LL_TIM_EnableARRPreload(TIM3); /* Force update generation */ LL_TIM_GenerateEvent_UPDATE(TIM3); } /** * @brief This function configures TIM2 to generate a positive pulse on OC1 * with a length of 3 s and after a delay of 2 s as soon as a positive * edge is detected on the TI2 input pin. * @param None * @retval None */ __STATIC_INLINE void ConfigureTIMOnePulse_TI2Trigger(void) { uint32_t TIM2_clk; /******************************/ /* Peripheral clocks enabling */ /******************************/ /* Enable the peripheral clock of GPIOs */ LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOA);; /* Enable the peripheral clock of TIM2 */ LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM2); /*************************/ /* GPIO AF configuration */ /*************************/ /* GPIO TIM2_CH1 configuration */ LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_0, LL_GPIO_MODE_ALTERNATE); LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_0, LL_GPIO_PULL_DOWN); LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_0, LL_GPIO_SPEED_FREQ_HIGH); /* GPIO TIM2_CH2 configuration */ LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_1, LL_GPIO_MODE_ALTERNATE); LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_1, LL_GPIO_PULL_DOWN); LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_1, LL_GPIO_SPEED_FREQ_HIGH); /*******************************/ /* Input trigger configuration */ /*******************************/ /* Map TI2FP2 on TI2 */ LL_TIM_IC_SetActiveInput(TIM2, LL_TIM_CHANNEL_CH2, LL_TIM_ACTIVEINPUT_DIRECTTI); /* TI2FP2 must detect a rising edge */ LL_TIM_IC_SetPolarity(TIM2, LL_TIM_CHANNEL_CH2, LL_TIM_IC_POLARITY_RISING); /* Configure TI2FP2 as trigger */ LL_TIM_SetTriggerInput(TIM2, LL_TIM_TS_TI2FP2); /* Enable the slave mode controller: TI2FP2 is used to start the counter */ LL_TIM_SetSlaveMode(TIM2, LL_TIM_SLAVEMODE_TRIGGER); /*********************************/ /* Output waveform configuration */ /*********************************/ /* Select counter mode: counting up */ LL_TIM_SetCounterMode(TIM2, LL_TIM_COUNTERMODE_UP); /* Set the one pulse mode: generate only 1 pulse */ LL_TIM_SetOnePulseMode(TIM2, LL_TIM_ONEPULSEMODE_SINGLE); /* In this example TIM2 input clock (TIM2CLK) is set to APB1 clock (PCLK1), */ /* since APB1 pre-scaler is equal to 1. */ /* TIM2CLK = PCLK1 */ /* PCLK1 = HCLK */ /* => TIM2CLK = SystemCoreClock (72 MHz) */ TIM2_clk = SystemCoreClock/1; /* Set the TIM2 prescaler to get counter clock frequency at 2 kHz */ LL_TIM_SetPrescaler(TIM2, __LL_TIM_CALC_PSC(TIM2_clk, 2000)); /* Set the capture/compare register to get a pulse delay of 2s (2000000 us)*/ LL_TIM_OC_SetCompareCH1(TIM2, __LL_TIM_CALC_DELAY(TIM2_clk, LL_TIM_GetPrescaler(TIM2), 2000000)); /* Set the autoreload register to get a pulse length of 3s (3000000 us)*/ LL_TIM_SetAutoReload(TIM2, __LL_TIM_CALC_PULSE(TIM2_clk, LL_TIM_GetPrescaler(TIM2), 2000000, 3000000)); /* Set output channel 1 in PWM2 mode */ LL_TIM_OC_SetMode(TIM2, LL_TIM_CHANNEL_CH1, LL_TIM_OCMODE_PWM2); /* Configure output channel 1 configuration */ LL_TIM_OC_ConfigOutput(TIM2, LL_TIM_CHANNEL_CH1, LL_TIM_OCPOLARITY_HIGH | LL_TIM_OCIDLESTATE_LOW); /**************************/ /* Start pulse generation */ /**************************/ /* Enable channel 1 */ LL_TIM_CC_EnableChannel(TIM2, LL_TIM_CHANNEL_CH1); /* Enable auto-reload register preload */ LL_TIM_EnableARRPreload(TIM2); /* Force update generation */ LL_TIM_GenerateEvent_UPDATE(TIM2); } /** * @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); /* 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) = 72000000 * HCLK(Hz) = 72000000 * AHB Prescaler = 1 * APB1 Prescaler = 2 * APB2 Prescaler = 1 * HSE Frequency(Hz) = 8000000 * PLLMUL = 9 * Flash Latency(WS) = 2 * @param None * @retval None */ void SystemClock_Config(void) { /* Set FLASH latency */ LL_FLASH_SetLatency(LL_FLASH_LATENCY_2); /* Enable HSE oscillator */ LL_RCC_HSE_EnableBypass(); LL_RCC_HSE_Enable(); while(LL_RCC_HSE_IsReady() != 1) { }; /* Main PLL configuration and activation */ LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE_DIV_1, LL_RCC_PLL_MUL_9); 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 in using frequency set to 72MHz */ LL_Init1msTick(72000000); /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */ LL_SetSystemCoreClock(72000000); } /******************************************************************************/ /* USER IRQ HANDLER TREATMENT */ /******************************************************************************/ /** * @brief User button interrupt processing * @note TIM3 counter is enabled every time the user button is presssed. * @param None * @retval None */ void UserButton_Callback(void) { /* Enable counter. Note that the counter will stop automatically at the */ /* next update event (UEV). */ LL_TIM_EnableCounter(TIM3); } /** * @brief Timer capture/compare interrupt processing * @note Calculates the pulse delay and pulse length of the output waveform * generated by TIM3. * @param None * @retval None */ void TimerCaptureCompare_Callback(void) { uint32_t CNT; uint32_t PSC; uint32_t ARR; CNT = LL_TIM_GetCounter(TIM3); PSC = LL_TIM_GetPrescaler(TIM3); ARR = LL_TIM_GetAutoReload(TIM3); uwMeasuredDelay = (CNT * 1000000)/(SystemCoreClock/(PSC + 1)); uwMeasuredPulseLength = ((ARR - CNT) * 1000000)/(SystemCoreClock/(PSC + 1)); } #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 /** * @} */ /** * @} */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/