stm8l15x_adc.c

STM8L的tim4定时器使用

/**
  ******************************************************************************
  * @file    stm8l15x_adc.c
  * @author  MCD Application Team
  * @version V1.5.0
  * @date    13-May-2011
  * @brief   This file provides firmware functions to manage the following 
  *          functionalities of the Analog to Digital Convertor (ADC) peripheral:           
  *           - Initialization and Configuration
  *           - Power saving
  *           - Analog Watchdog configuration              
  *           - Temperature Sensor & Vrefint (Voltage Reference internal) management 
  *           - Regular Channels Configuration
  *           - Regular Channels DMA Configuration
  *           - Injected channels Configuration      
  *           - Interrupts and flags management       
  *         
  *  @verbatim
  *                               
  *          ===================================================================      
  *                                   How to use this driver
  *          ===================================================================      
  *          1. Enable The ADC controller clock using CLK_PeripheralClockConfig() 
  *            function : CLK_PeripheralClockConfig(CLK_Peripheral_ADC1, ENABLE).
  *
  *            2. Configure the ADC Prescaler, conversion resolution and data 
  *              alignment using the ADC_Init() function.
  * 
  *            3. Activate the ADC peripheral using ADC_Cmd() function.  
  *
  *          Regular channels group configuration
  *          ====================================    
  *            - To configure the ADC regular channels group features, use 
  *              ADC_Init() and ADC_RegularChannelConfig() functions.
  *            - To activate the continuous mode, use the ADC_continuousModeCmd()
  *              function.
  *            - To configure and activate the Discontinuous mode, use the 
  *              ADC_DiscModeChannelCountConfig() and ADC_DiscModeCmd() functions.        
  *            - To read the ADC converted values, use the ADC_GetConversionValue()
  *              function.
  *
  *          DMA for Regular channels group features configuration
  *          ====================================================== 
  *           - To enable the DMA mode for regular channels group, use the 
  *             ADC_DMACmd() function.
  *           - To enable the generation of DMA requests continuously at the end
  *             of the last DMA transfer, use the ADC_DMARequestAfterLastTransferCmd() 
  *             function.    
             
  *          Injected channels group configuration
  *          =====================================    
  *            - To configure the ADC Injected channels group features, use 
  *              ADC_InjectedChannelConfig() and  ADC_InjectedSequencerLengthConfig()
  *              functions.
  *            - To activate the continuous mode, use the ADC_continuousModeCmd()
  *              function.
  *            - To activate the Injected Discontinuous mode, use the 
  *              ADC_InjectedDiscModeCmd() function.  
  *            - To activate the AutoInjected mode, use the ADC_AutoInjectedConvCmd() 
  *              function.        
  *            - To read the ADC converted values, use the ADC_GetInjectedConversionValue() 
  *              function.
  *              
  *  @endverbatim
  *         
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  ******************************************************************************  
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm8l15x_adc.h"

/** @addtogroup STM8L15x_StdPeriph_Driver
  * @{
  */

/** @defgroup ADC 
  * @brief ADC driver modules
  * @{
  */ 
  
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup ADC_Private_Functions
  * @{
  */ 
    
    
/** @defgroup ADC_Group1 Initialization and Configuration functions
 *  @brief   Initialization and Configuration functions 
 *
@verbatim    
 ===============================================================================
                      Initialization and Configuration functions
 ===============================================================================  
  This section provides functions allowing to:
   - Enable or disable the ADC peripheral,
   - Initialize and configure the ADC Prescaler, ADC Conversion Resolution 
     (12bit..6bit), ADC Continuous Conversion Mode (Continuous or Single 
     conversion),
   - Configure External trigger Sensitivity and source,
   - Start ADC conversion, by software trigger.


@endverbatim
  * @{
  */
/**
  * @brief  Deinitializes the ADC peripheral registers to their default reset 
  *         values.
  * @param  ADCx where x can be 1 to select the specified ADC peripheral.
  * @retval None
  */
void ADC_DeInit(ADC_TypeDef* ADCx)
{
  /*  Set the Configuration registers to their reset values */
  ADCx->CR1 =  ADC_CR1_RESET_VALUE;
  ADCx->CR2 =  ADC_CR2_RESET_VALUE;
  ADCx->CR3 =  ADC_CR3_RESET_VALUE;

  /*  Set the status registers to their reset values */
  ADCx->SR =  (uint8_t)~ADC_SR_RESET_VALUE;

  /*  Set the High threshold registers to their reset values */
  ADCx->HTRH =  ADC_HTRH_RESET_VALUE;
  ADCx->HTRL =  ADC_HTRL_RESET_VALUE;

  /*  Set the low threshold registers to their reset values */
  ADCx->LTRH =  ADC_LTRH_RESET_VALUE;
  ADCx->LTRL =  ADC_LTRL_RESET_VALUE;

  /*  Set the channels sequence registers to their reset values */
  ADCx->SQR[0] =  ADC_SQR1_RESET_VALUE;
  ADCx->SQR[1] =  ADC_SQR2_RESET_VALUE;
  ADCx->SQR[2] =  ADC_SQR3_RESET_VALUE;
  ADCx->SQR[3] =  ADC_SQR4_RESET_VALUE;

  /*  Set the channels Trigger registers to their reset values */
  ADCx->TRIGR[0] =  ADC_TRIGR1_RESET_VALUE;
  ADCx->TRIGR[1] =  ADC_TRIGR2_RESET_VALUE;
  ADCx->TRIGR[2] =  ADC_TRIGR3_RESET_VALUE;
  ADCx->TRIGR[3] =  ADC_TRIGR4_RESET_VALUE;
}

/**
  * @brief  Initializes the specified ADC peripheral according to the specified 
  *         parameters.
  * @param  ADCx where x can be 1 to select the specified ADC peripheral.
  * @param  ADC_ConversionMode : specifies the ADC conversion mode,
  *          This parameter can be one of the following values:
  *            @arg ADC_ConversionMode_Single: Single Conversion Mode
  *            @arg ADC_ConversionMode_Continuous: Continuous Conversion Mode
  * @param  ADC_Resolution : specifies the ADC Data resolution,
  *          This parameter can be one of the following values:
  *            @arg ADC_Resolution_12Bit: 12 bit resolution
  *            @arg ADC_Resolution_10Bit: 10 bit resolution
  *            @arg ADC_Resolution_8Bit: 8 bit resolution
  *            @arg ADC_Resolution_6Bit: 6 bit resolution      
  * @param  ADC_Prescaler : specifies the ADC Prescaler,
  *          This parameter can be one of the following values:
  *            @arg ADC_Prescaler_1: ADC Clock frequency is divided by 1
  *            @arg ADC_Prescaler_2: ADC Clock frequency is divided by 2
  * @retval None
  */
void ADC_Init(ADC_TypeDef* ADCx,
              ADC_ConversionMode_TypeDef ADC_ConversionMode,
              ADC_Resolution_TypeDef ADC_Resolution,
              ADC_Prescaler_TypeDef ADC_Prescaler)
{
  /* Check the parameters */
  assert_param(IS_ADC_CONVERSION_MODE(ADC_ConversionMode));
  assert_param(IS_ADC_RESOLUTION(ADC_Resolution));
  assert_param(IS_ADC_PRESCALER(ADC_Prescaler));

  /*clear CR1 register */
  ADCx->CR1 &= (uint8_t)~(ADC_CR1_CONT | ADC_CR1_RES);

  /* set the resolution and the conversion mode */
  ADCx->CR1 |= (uint8_t)((uint8_t)ADC_ConversionMode | (uint8_t)ADC_Resolution);

  /*clear CR2 register */
  ADCx->CR2 &= (uint8_t)~(ADC_CR2_PRESC);

  /* set the Prescaler */
  ADCx->CR2 |= (uint8_t) ADC_Prescaler;
}

/**
  * @brief  Enables or disables the selected ADC peripheral.
  * @param  ADCx where x can be 1 to select the specified ADC peripheral.
  * @param  NewState : new state of the specified ADC peripheral.
    *         This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ADC_Cmd(ADC_TypeDef* ADCx,
             FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Set the ADON bit to wake up the specified ADC from power down mode */
    ADCx->CR1 |= ADC_CR1_ADON;
  }
  else
  {
    /* Disable the selected ADC peripheral */
    ADCx->CR1 &= (uint8_t)~ADC_CR1_ADON;
  }
}

/**
  * @brief  Starts ADC conversion, by software trigger.
  * @param  ADCx where x can be 1 to select the specified ADC peripheral.
  * @retval None
  */
void ADC_SoftwareStartConv(ADC_TypeDef* ADCx)
{
  /*  Start the ADC software conversion */
  ADCx->CR1 |= ADC_CR1_START;
}

/**
  * @brief  Configures the ADC conversion through external trigger.
  * @param  ADCx where x can be 1 to select the specified ADC peripheral.
  * @param  ADC_ExtEventSelection : Specifies the external trigger.
  *          This parameter can be one of the following values:
  *            @arg ADC_ExtEventSelection_None: Conversion starts only by software start
  *            @arg ADC_ExtEventSelection_Trigger1: Trigger 1  Enables conversion
  *            @arg ADC_ExtEventSelection_Trigger2: Trigger 2  Enables conversion
  *            @arg ADC_ExtEventSelection_Trigger3: Trigger 3  Enables conversion      
  * @param  ADC_ExtTRGSensitivity : Specifies the external trigger sensitivity.
  *          This parameter can be one of the following values:
  *            @arg ADC_ExtTRGSensitivity_Rising: External Trigger Sensitivity is Rising Edge
  *            @arg ADC_ExtTRGSensitivity_Falling: External Trigger Sensitivity is Falling Edge
  *            @arg ADC_ExtTRGSensitivity_All: External Trigger Sensitivity is Falling and Rising Edge
  * @retval None
  */
void ADC_ExternalTrigConfig(ADC_TypeDef* ADCx,
                            ADC_ExtEventSelection_TypeDef ADC_ExtEventSelection,
                            ADC_ExtTRGSensitivity_TypeDef ADC_ExtTRGSensitivity)
{
  /* Check the parameters */
  assert_param(IS_ADC_EXT_EVENT_SELECTION(ADC_ExtEventSelection));
  assert_param(IS_ADC_EXT_TRG_SENSITIVITY(ADC_ExtTRGSensitivity));

  /*clear old configuration of CR2 register */
  ADCx->CR2 &= (uint8_t)~(ADC_CR2_TRIGEDGE | ADC_CR2_EXTSEL);