/**
  ******************************************************************************
  * @file    TIM/TIM_PWMInput/Src/main.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    14-April-2017
  * @brief   This example shows how to use the TIM peripheral to measure the
  *          frequency and duty cycle of an external signal.
  ******************************************************************************
  * @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_MIX_Examples
  * @{
  */

/** @addtogroup TIM_PWMInput
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Number of frequencies */
#define TIM_FREQUENCIES_NB 6
#define TIM_DUTYCYCLE_NB 2
/* TIM3_ARR register maximum value */
#define TIM3_ARR_MAX (uint32_t)0xFFFF
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Timer handler declaration */
TIM_HandleTypeDef htim3;
TIM_HandleTypeDef htim2;

/* Timer Input Capture Configuration Structure declaration */
TIM_IC_InitTypeDef       sConfig;

/* Slave configuration structure */
TIM_SlaveConfigTypeDef   sSlaveConfig;

/* Captured Value */
__IO uint32_t            uwIC2Value = 0;
/* Duty Cycle Value */
__IO uint32_t            uwDutyCycle = 0;
/* Frequency Value */
__IO uint32_t            uwFrequency = 0;

/* Counter Prescaler value */
uint32_t uhPrescalerValue = 0;

static uint8_t iFrequency = 0;
/* Frequency index *//* Frequency table */
static uint32_t aFrequency[TIM_FREQUENCIES_NB] = {
  2000,   /*  2 kHz */
  2000,   /*  2 kHz */
  3000,   /*  3 kHz */
  3000,   /*  3 kHz */
  4000,   /*  4 kHz */
  4000,   /*  4 kHz */
};
/* Frequency index */

static uint8_t iDutyCycle = 0;
static uint32_t aDutyCycle[TIM_DUTYCYCLE_NB] = {
  2,   /*  50% */
  4,   /*  25% */
};

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void Error_Handler(void);
static void UserButton_Init(void);
static void WaveGeneration_Init(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  /* STM32F103xB HAL library initialization:
       - Configure the Flash prefetch
       - Systick timer is configured by default as source of time base, but user 
         can eventually implement his proper time base source (a general purpose 
         timer for example or other time source), keeping in mind that Time base 
         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
         handled in milliseconds basis.
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure the system clock to 72 MHz */
  SystemClock_Config();

  /* Initialize all configured peripherals */
  /* Initialize push button */
  UserButton_Init();
  /* Initialize TIM2 for output waveform generation */
  WaveGeneration_Init();
  /* Configure LED2 */
  BSP_LED_Init(LED2);

  /* Start Input waveform generation */
  if (HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1) != HAL_OK)
  {
    /* PWM Generation Error */
    Error_Handler();
  }  
  
  /*##-1- Configure the TIM peripheral #######################################*/
  /* ---------------------------------------------------------------------------
  TIM3 configuration: PWM Input mode

  In this example TIM3 input clock (TIM3CLK) is set to APB1 clock (PCLK1),
    since APB1 prescaler is 1.
    TIM3CLK = PCLK1
    PCLK1 = HCLK
    => TIM3CLK = HCLK = SystemCoreClock

  External Signal Frequency = TIM3 counter clock / TIM3_CCR2 in Hz.

  External Signal DutyCycle = (TIM3_CCR1*100)/(TIM3_CCR2) in %.

  --------------------------------------------------------------------------- */

  /* Set TIMx instance */
  htim3.Instance = TIMx;

  /* Initialize TIMx peripheral as follows:
       + Period = 0xFFFF
       + Prescaler = 0
       + ClockDivision = 0
       + Counter direction = Up
  */
  htim3.Init.Period            = 0xFFFF;
  htim3.Init.Prescaler         = 0;
  htim3.Init.ClockDivision     = 0;
  htim3.Init.CounterMode       = TIM_COUNTERMODE_UP;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

  if (HAL_TIM_IC_Init(&htim3) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /*##-2- Configure the Input Capture channels ###############################*/
  /* Common configuration */
  sConfig.ICPrescaler = TIM_ICPSC_DIV1;
  sConfig.ICFilter = 0;

  /* Configure the Input Capture of channel 1 */
  sConfig.ICPolarity = TIM_ICPOLARITY_FALLING;
  sConfig.ICSelection = TIM_ICSELECTION_INDIRECTTI;
  if (HAL_TIM_IC_ConfigChannel(&htim3, &sConfig, TIM_CHANNEL_1) != HAL_OK)
  {
    /* Configuration Error */
    Error_Handler();
  }

  /* Configure the Input Capture of channel 2 */
  sConfig.ICPolarity = TIM_ICPOLARITY_RISING;
  sConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
  if (HAL_TIM_IC_ConfigChannel(&htim3, &sConfig, TIM_CHANNEL_2) != HAL_OK)
  {
    /* Configuration Error */
    Error_Handler();
  }
  /*##-3- Configure the slave mode ###########################################*/
  /* Select the slave Mode: Reset Mode  */
  sSlaveConfig.SlaveMode        = TIM_SLAVEMODE_RESET;
  sSlaveConfig.InputTrigger     = TIM_TS_TI2FP2;
  sSlaveConfig.TriggerPolarity  = TIM_TRIGGERPOLARITY_NONINVERTED;
  sSlaveConfig.TriggerPrescaler = TIM_TRIGGERPRESCALER_DIV1;
  sSlaveConfig.TriggerFilter    = 0;
  if (HAL_TIM_SlaveConfigSynchronization(&htim3, &sSlaveConfig) != HAL_OK)
  {
    /* Configuration Error */
    Error_Handler();
  }

  /*##-4- Start the Input Capture in interrupt mode ##########################*/
  if (HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_2) != HAL_OK)
  {
    /* Starting Error */
    Error_Handler();
  }

  /*##-5- Start the Input Capture in interrupt mode ##########################*/
  if (HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_1) != HAL_OK)
  {
    /* Starting Error */
    Error_Handler();
  }

  while (1)
  {
  }
}

/**
  * @brief  TIM2 is used to generate an output waveform 
  *         (instead of using a function generator)
  * @param  None
  * @retval None
  */
void WaveGeneration_Init(void)
{

  TIM_MasterConfigTypeDef sMasterConfig;
  TIM_OC_InitTypeDef sConfigOC;

  htim2.Instance = TIM2;
  htim2.Init.Prescaler = uhPrescalerValue;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = (SystemCoreClock/1)/aFrequency[0];
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  HAL_TIM_PWM_Init(&htim2);

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig);

  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = ((SystemCoreClock/1)/aFrequency[0])/aDutyCycle[0];
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1);
}

/**
  * @brief  Init GPIO EXTI for push button
  * @param  None
  * @retval None
  */
void UserButton_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();

    /*Configure GPIO pin : UserButton_Pin */
  GPIO_InitStruct.Pin = GPIO_PIN_13;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /* EXTI interrupt init*/
  HAL_NVIC_SetPriority(EXTI15_10_IRQn, 2, 0);
  HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);
}


/**
  * @brief EXTI line detection callbacks
  * @param GPIO_Pin: Specifies the pins connected EXTI line
  * @retval None
  */
void UserButton_Callback()
{
    /* Set new PWM signal frequency and duty cycle*/
    iFrequency = (iFrequency + 1) % TIM_FREQUENCIES_NB;
    iDutyCycle = (iDutyCycle + 1) % TIM_DUTYCYCLE_NB;

    /* Set the auto-reload value to have the requested frequency */
    /* Frequency = TIM2CLK / (ARR + 1) = SystemCoreClock / (ARR + 1)  */
    LL_TIM_SetAutoReload(TIM2, __LL_TIM_CALC_ARR(SystemCoreClock/1, LL_TIM_GetPrescaler(TIM2), aFrequency[iFrequency]));
 
    /* Set  duty cycle */
    LL_TIM_OC_SetCompareCH1(TIM2, (LL_TIM_GetAutoReload(TIM2) / aDutyCycle[iDutyCycle]));	

}

/**
  * @brief  Input Capture callback in non blocking mode 
  * @param  htim : TIM IC handle
  * @retval None
  */
void TimerCaptureCompare_Ch2_Callback()
 {
     /* Get the Input Capture value */
     uwIC2Value = LL_TIM_IC_GetCaptureCH2(TIM3);

     if (uwIC2Value != 0)
     {
       /* Duty cycle computation */
       uwDutyCycle = (LL_TIM_IC_GetCaptureCH1(TIM3) * 100) / uwIC2Value;

       /* uwFrequency computation
       TIM3 freq  = SystemCoreClock */
       uwFrequency = SystemCoreClock  / (1*uwIC2Value);
     }
     else
     {
       uwDutyCycle = 0;
       uwFrequency = 0;
     }
 }

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* Turn LED2 on */
  BSP_LED_On(LED2);
  while (1)
  {
  }
}

/**
  * @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
  *            PLLMUL                         = 9
  *            Flash Latency(WS)              = 2
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  
  /* Configure PLL ------------------------------------------------------*/
  /* PLL configuration: PLLCLK = HSE * PLLMUL = 8 * 9 = 72 MHz */
  /* PREDIV1 configuration: PREDIV1CLK = PLLCLK / HSEPredivValue = 72 / 1 = 72 MHz */
  /* Enable HSE and activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState       = RCC_HSE_BYPASS;
  RCC_OscInitStruct.HSIState       = RCC_HSI_OFF;
  RCC_OscInitStruct.PLL.PLLState   = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource  = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.HSEPredivValue     = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.PLL.PLLMUL         = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }

  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 
     clocks dividers */
  RCC_ClkInitStruct.ClockType      = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  RCC_ClkInitStruct.SYSCLKSource   = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider  = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;  
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2)!= HAL_OK)
  {
    /* Initialization Error */
    while(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\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}

#endif

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
