main.c

stm32f0固件库

/**
  ******************************************************************************
  * @file    ADC_LowPower/main.c 
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    23-March-2012
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2012 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 "stm32f0xx.h"
#include "stm32f0_discovery.h"

/** @addtogroup STM32F0_Discovery_Peripheral_Examples
  * @{
  */

/** @addtogroup ADC_LowPower
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint16_t  ADC1ConvertedValue = 0, ADC1ConvertedVoltage = 0;

/* Private function prototypes -----------------------------------------------*/
void ADC1_Config(void);

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

/**
  * @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
     */
  
  /* User button configuration */  
  STM_EVAL_PBInit(BUTTON_USER, BUTTON_MODE_GPIO);
    
  /* Configure ADC1 Channel 11 */
  ADC1_Config();
    
  /* Infinite loop */
  while (1)
  {
    /* Press User button to get the converted data */
    while(STM_EVAL_PBGetState(BUTTON_USER) == RESET);
    
    /* Get ADC1 converted data */
    ADC1ConvertedValue = ADC_GetConversionValue(ADC1);
    
    /* Compute the voltage */
    ADC1ConvertedVoltage = (ADC1ConvertedValue * 3300)/0xFFF;
  }
}

/**
  * @brief  ADC1 channel11 configuration
  * @param  None
  * @retval None
  */
void ADC1_Config(void)
{
  ADC_InitTypeDef          ADC_InitStructure;
  GPIO_InitTypeDef         GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef        TIM_OCInitStructure; 
  
  /* GPIOC Periph clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
  
  /* ADC1 Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  
  /* TIM3 Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  
  /* Configure ADC Channel11 as analog input */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  
  /* TIM3 Configuration *******************************************************/
  TIM_DeInit(TIM3);
  
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  
  TIM_OCStructInit(&TIM_OCInitStructure);
    
  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 0xFF;
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
  
  /* TIM3 TRGO selection */
  TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
  
  /* ADC1 Configuration *******************************************************/
  /* ADCs DeInit */  
  ADC_DeInit(ADC1);
  
  /* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits*/
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;    
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
  ADC_Init(ADC1, &ADC_InitStructure); 
  
  /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */ 
  ADC_ChannelConfig(ADC1, ADC_Channel_11 , ADC_SampleTime_28_5Cycles);   

  /* ADC Calibration */
  ADC_GetCalibrationFactor(ADC1);

  /* Enable the auto delay feature */    
  ADC_WaitModeCmd(ADC1, ENABLE); 
  
  /* Enable the Auto power off mode */
  ADC_AutoPowerOffCmd(ADC1, ENABLE); 
  
  /* Enable ADCperipheral[PerIdx] */
  ADC_Cmd(ADC1, ENABLE);     
  
  /* Wait the ADCEN falg */
  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN)); 
  
  /* TIM2 enable counter */
  TIM_Cmd(TIM3, ENABLE);
  
  /* ADC1 regular Software Start Conv */ 
  ADC_StartOfConversion(ADC1);
}

#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****/