STM32F439xx HAL User Manual: stm32f4xx_hal

DAC HAL module driver. This file provides firmware functions to manage the following functionalities of the Digital to Analog Converter (DAC) peripheral: + Initialization and de-initialization functions + IO operation functions + Peripheral Control functions + Peripheral State and Errors functions. More...

#include "stm32f4xx_hal.h"

Go to the source code of this file.

Functions
static void	DAC_DMAConvCpltCh1 (DMA_HandleTypeDef *hdma)
	DMA conversion complete callback.
static void	DAC_DMAErrorCh1 (DMA_HandleTypeDef *hdma)
	DMA error callback.
static void	DAC_DMAHalfConvCpltCh1 (DMA_HandleTypeDef *hdma)
	DMA half transfer complete callback.
HAL_StatusTypeDef	HAL_DAC_Init (DAC_HandleTypeDef *hdac)
	Initializes the DAC peripheral according to the specified parameters in the DAC_InitStruct.
HAL_StatusTypeDef	HAL_DAC_DeInit (DAC_HandleTypeDef *hdac)
	Deinitializes the DAC peripheral registers to their default reset values.
__weak void	HAL_DAC_MspInit (DAC_HandleTypeDef *hdac)
	Initializes the DAC MSP.
__weak void	HAL_DAC_MspDeInit (DAC_HandleTypeDef *hdac)
	DeInitializes the DAC MSP.
HAL_StatusTypeDef	HAL_DAC_Start (DAC_HandleTypeDef *hdac, uint32_t Channel)
	Enables DAC and starts conversion of channel.
HAL_StatusTypeDef	HAL_DAC_Stop (DAC_HandleTypeDef *hdac, uint32_t Channel)
	Disables DAC and stop conversion of channel.
HAL_StatusTypeDef	HAL_DAC_Start_DMA (DAC_HandleTypeDef hdac, uint32_t Channel, uint32_t pData, uint32_t Length, uint32_t Alignment)
	Enables DAC and starts conversion of channel.
HAL_StatusTypeDef	HAL_DAC_Stop_DMA (DAC_HandleTypeDef *hdac, uint32_t Channel)
	Disables DAC and stop conversion of channel.
uint32_t	HAL_DAC_GetValue (DAC_HandleTypeDef *hdac, uint32_t Channel)
	Returns the last data output value of the selected DAC channel.
void	HAL_DAC_IRQHandler (DAC_HandleTypeDef *hdac)
	Handles DAC interrupt request.
__weak void	HAL_DAC_ConvCpltCallbackCh1 (DAC_HandleTypeDef *hdac)
	Conversion complete callback in non blocking mode for Channel1.
__weak void	HAL_DAC_ConvHalfCpltCallbackCh1 (DAC_HandleTypeDef *hdac)
	Conversion half DMA transfer callback in non blocking mode for Channel1.
__weak void	HAL_DAC_ErrorCallbackCh1 (DAC_HandleTypeDef *hdac)
	Error DAC callback for Channel1.
__weak void	HAL_DAC_DMAUnderrunCallbackCh1 (DAC_HandleTypeDef *hdac)
	DMA underrun DAC callback for channel1.
HAL_StatusTypeDef	HAL_DAC_ConfigChannel (DAC_HandleTypeDef hdac, DAC_ChannelConfTypeDef sConfig, uint32_t Channel)
	Configures the selected DAC channel.
HAL_StatusTypeDef	HAL_DAC_SetValue (DAC_HandleTypeDef *hdac, uint32_t Channel, uint32_t Alignment, uint32_t Data)
	Set the specified data holding register value for DAC channel.
HAL_DAC_StateTypeDef	HAL_DAC_GetState (DAC_HandleTypeDef *hdac)
	return the DAC state
uint32_t	HAL_DAC_GetError (DAC_HandleTypeDef *hdac)
	Return the DAC error code.

Detailed Description

Author:

MCD Application Team

  ==============================================================================
                      ##### DAC Peripheral features #####
  ==============================================================================
    [..]        
      *** DAC Channels ***
      ====================  
    [..]
    The device integrates two 12-bit Digital Analog Converters that can 
    be used independently or simultaneously (dual mode):
      (#) DAC channel1 with DAC_OUT1 (PA4) as output
      (#) DAC channel2 with DAC_OUT2 (PA5) as output
      
      *** DAC Triggers ***
      ====================
    [..]
    Digital to Analog conversion can be non-triggered using DAC_TRIGGER_NONE
    and DAC_OUT1/DAC_OUT2 is available once writing to DHRx register. 
    [..] 
    Digital to Analog conversion can be triggered by:
      (#) External event: EXTI Line 9 (any GPIOx_Pin9) using DAC_TRIGGER_EXT_IT9.
          The used pin (GPIOx_Pin9) must be configured in input mode.
  
      (#) Timers TRGO: TIM2, TIM4, TIM5, TIM6, TIM7 and TIM8 
          (DAC_TRIGGER_T2_TRGO, DAC_TRIGGER_T4_TRGO...)
  
      (#) Software using DAC_TRIGGER_SOFTWARE
  
      *** DAC Buffer mode feature ***
      =============================== 
      [..] 
      Each DAC channel integrates an output buffer that can be used to 
      reduce the output impedance, and to drive external loads directly
      without having to add an external operational amplifier.
      To enable, the output buffer use  
      sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
      [..]           
      (@) Refer to the device datasheet for more details about output 
          impedance value with and without output buffer.
            
       *** DAC wave generation feature ***
       =================================== 
       [..]     
       Both DAC channels can be used to generate
         (#) Noise wave 
         (#) Triangle wave
            
       *** DAC data format ***
       =======================
       [..]   
       The DAC data format can be:
         (#) 8-bit right alignment using DAC_ALIGN_8B_R
         (#) 12-bit left alignment using DAC_ALIGN_12B_L
         (#) 12-bit right alignment using DAC_ALIGN_12B_R
  
       *** DAC data value to voltage correspondence ***  
       ================================================ 
       [..] 
       The analog output voltage on each DAC channel pin is determined
       by the following equation: 
       DAC_OUTx = VREF+ * DOR / 4095
       with  DOR is the Data Output Register
          VEF+ is the input voltage reference (refer to the device datasheet)
        e.g. To set DAC_OUT1 to 0.7V, use
          Assuming that VREF+ = 3.3V, DAC_OUT1 = (3.3 * 868) / 4095 = 0.7V
  
       *** DMA requests  ***
       =====================
       [..]    
       A DMA1 request can be generated when an external trigger (but not
       a software trigger) occurs if DMA1 requests are enabled using
       HAL_DAC_Start_DMA()
       [..]
       DMA1 requests are mapped as following:
         (#) DAC channel1 : mapped on DMA1 Stream5 channel7 which must be 
             already configured
         (#) DAC channel2 : mapped on DMA1 Stream6 channel7 which must be 
             already configured
       
    -@- For Dual mode and specific signal (Triangle and noise) generation please 
        refer to Extension Features Driver description        
  
      
                      ##### How to use this driver #####
  ==============================================================================
    [..]          
      (+) DAC APB clock must be enabled to get write access to DAC
          registers using HAL_DAC_Init()
      (+) Configure DAC_OUTx (DAC_OUT1: PA4, DAC_OUT2: PA5) in analog mode.
      (+) Configure the DAC channel using HAL_DAC_ConfigChannel() function.
      (+) Enable the DAC channel using HAL_DAC_Start() or HAL_DAC_Start_DMA functions

     *** Polling mode IO operation ***
     =================================
     [..]    
       (+) Start the DAC peripheral using HAL_DAC_Start() 
       (+) To read the DAC last data output value, use the HAL_DAC_GetValue() function.
       (+) Stop the DAC peripheral using HAL_DAC_Stop()
       
     *** DMA mode IO operation ***    
     ==============================
     [..]    
       (+) Start the DAC peripheral using HAL_DAC_Start_DMA(), at this stage the user specify the length 
           of data to be transferred at each end of conversion 
       (+) At The end of data transfer HAL_DAC_ConvCpltCallbackCh1()or HAL_DAC_ConvCpltCallbackCh2()  
           function is executed and user can add his own code by customization of function pointer 
           HAL_DAC_ConvCpltCallbackCh1 or HAL_DAC_ConvCpltCallbackCh2
       (+) In case of transfer Error, HAL_DAC_ErrorCallbackCh1() function is executed and user can 
            add his own code by customization of function pointer HAL_DAC_ErrorCallbackCh1
       (+) Stop the DAC peripheral using HAL_DAC_Stop_DMA()
                    
     *** DAC HAL driver macros list ***
     ============================================= 
     [..]
       Below the list of most used macros in DAC HAL driver.
       
      (+) __HAL_DAC_ENABLE : Enable the DAC peripheral
      (+) __HAL_DAC_DISABLE : Disable the DAC peripheral
      (+) __HAL_DAC_CLEAR_FLAG: Clear the DAC's pending flags
      (+) __HAL_DAC_GET_FLAG: Get the selected DAC's flag status
      
     [..]
      (@) You can refer to the DAC HAL driver header file for more useful macros

Attention:

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Definition in file stm32f4xx_hal_dac.c.

Functions

Detailed Description

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