/**
  ******************************************************************************
  * @file    Examples_LL/TIM/TIM_OnePulse/Src/main.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    14-April-2017
  * @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
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* 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****/
