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STM32CubeF1/Projects/STM32F103RB-Nucleo/Examples_LL/TIM/TIM_OnePulse/Src/main.c

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/**
******************************************************************************
* @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 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 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
/**
* @}
*/
/**
* @}
*/
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