STM32F0xx_StdPeriph_Examples/COMP/COMP_PWMSignalControl/main.c

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/**
  ******************************************************************************
  * @file    COMP/COMP_PWMSignalControl/main.c 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32F0xx_StdPeriph_Examples
  * @{
  */

/** @addtogroup COMP_PWMSignalControl
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
static void COMP_Config(void);
static void TIM_Config(void);

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f0xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f0xx.c file
     */ 

  /* TIM2 channels Configuration in PWM mode */
  TIM_Config();

  /* COMP2 Configuration */
  COMP_Config();

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

/**
  * @brief  Configures TIM1: channels in PWM mode
  * @param  None
  * @retval None
  */
static void TIM_Config(void)
{
 
  TIM_BDTRInitTypeDef     TIM_BDTRInitStructure;
  TIM_OCInitTypeDef       TIM_OCInitStructure;
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  GPIO_InitTypeDef        GPIO_InitStructure;

  /* GPIOA clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  /* TIM1 channels pin configuration:
       TIM1_CH1 -> PA8
  */
  GPIO_StructInit(&GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
  GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_8;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Enable Alternate function on PA8 to be controlled by TIM1 */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2);

  /* TIM1 clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

  /* Time Base configuration */
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = 100;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  /* Channel 1 Configuration in PWM mode */
  TIM_OCStructInit(&TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 50;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);

  /* Automatic Output enable, Break, dead time and lock configuration*/
  TIM_BDTRStructInit(&TIM_BDTRInitStructure);
  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
  TIM_BDTRInitStructure.TIM_DeadTime = 11;
  TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
  TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
  TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
  TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

  /* Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);

  /* TIM1 counter enable */
  TIM_Cmd(TIM1, ENABLE);
}

/**
  * @brief  Configures COMP2: PA3 as COMP2 non inverting input
  *                           VREFINT as COMP2 inverting input
  *                           and COMP2 output to TIM2 BKIN.
  * @param  None
  * @retval None
  */
static void COMP_Config(void)
{
  
  COMP_InitTypeDef        COMP_InitStructure;
  GPIO_InitTypeDef        GPIO_InitStructure;
  /* GPIOA Peripheral clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  /* Configure PA3 in analog mode: PA3 is connected to COMP2 non inverting input */
  GPIO_StructInit(&GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* COMP Peripheral clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

  /* COMP2 config */
  COMP_StructInit(&COMP_InitStructure);
  COMP_InitStructure.COMP_InvertingInput = COMP_InvertingInput_VREFINT;
  COMP_InitStructure.COMP_Output = COMP_Output_TIM1BKIN;
  COMP_InitStructure.COMP_Hysteresis = COMP_Hysteresis_No;
  COMP_InitStructure.COMP_Mode = COMP_Mode_UltraLowPower;
  COMP_InitStructure.COMP_OutputPol =  COMP_OutputPol_NonInverted;
  COMP_Init(COMP_Selection_COMP2, &COMP_InitStructure);

  /* Enable COMP2 */
  COMP_Cmd(COMP_Selection_COMP2, ENABLE);
}


#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****/