stm32l4xx_hal_dfsdm.c File Reference

This file provides firmware functions to manage the following functionalities of the Digital Filter for Sigma-Delta Modulators (DFSDM) peripherals: + Initialization and configuration of channels and filters + Regular channels configuration + Injected channels configuration + Regular/Injected Channels DMA Configuration + Interrupts and flags management + Analog watchdog feature + Short-circuit detector feature + Extremes detector feature + Clock absence detector feature + Break generation on analog watchdog or short-circuit event. More...

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Detailed Description

This file provides firmware functions to manage the following functionalities of the Digital Filter for Sigma-Delta Modulators (DFSDM) peripherals: + Initialization and configuration of channels and filters + Regular channels configuration + Injected channels configuration + Regular/Injected Channels DMA Configuration + Interrupts and flags management + Analog watchdog feature + Short-circuit detector feature + Extremes detector feature + Clock absence detector feature + Break generation on analog watchdog or short-circuit event.

Author:

MCD Application Team

Version:

V1.1.0

Date:

16-September-2015

  ==============================================================================
                     ##### How to use this driver #####
  ==============================================================================
  [..]
    *** Channel initialization ***
    ==============================
    [..]
      (#) User has first to initialize channels (before filters initialization).
      (#) As prerequisite, fill in the HAL_DFSDM_ChannelMspInit() :
        (++) Enable DFSDM clock interface with __HAL_RCC_DFSDM_CLK_ENABLE().
        (++) Enable the clocks for the DFSDM GPIOS with __HAL_RCC_GPIOx_CLK_ENABLE().
        (++) Configure these DFSDM pins in alternate mode using HAL_GPIO_Init().
        (++) If interrupt mode is used, enable and configure DFSDM1 global
            interrupt with HAL_NVIC_SetPriority() and HAL_NVIC_EnableIRQ().
      (#) Configure the output clock, input, serial interface, analog watchdog,
          offset and data right bit shift parameters for this channel using the 
          HAL_DFSDM_ChannelInit() function.

    *** Channel clock absence detector ***
    ======================================
    [..]
      (#) Start clock absence detector using HAL_DFSDM_ChannelCkabStart() or
          HAL_DFSDM_ChannelCkabStart_IT().
      (#) In polling mode, use HAL_DFSDM_ChannelPollForCkab() to detect the clock
          absence.
      (#) In interrupt mode, HAL_DFSDM_ChannelCkabCallback() will be called if
          clock absence is detected.
      (#) Stop clock absence detector using HAL_DFSDM_ChannelCkabStop() or
          HAL_DFSDM_ChannelCkabStop_IT().
      (#) Please note that the same mode (polling or interrupt) has to be used 
          for all channels because the channels are sharing the same interrupt.
      (#) Please note also that in interrupt mode, if clock absence detector is
          stopped for one channel, interrupt will be disabled for all channels.

    *** Channel short circuit detector ***
    ======================================
    [..]    
      (#) Start short circuit detector using HAL_DFSDM_ChannelScdStart() or
          or HAL_DFSDM_ChannelScdStart_IT().
      (#) In polling mode, use HAL_DFSDM_ChannelPollForScd() to detect short
          circuit.
      (#) In interrupt mode, HAL_DFSDM_ChannelScdCallback() will be called if 
          short circuit is detected.
      (#) Stop short circuit detector using HAL_DFSDM_ChannelScdStop() or
          or HAL_DFSDM_ChannelScdStop_IT().
      (#) Please note that the same mode (polling or interrupt) has to be used 
          for all channels because the channels are sharing the same interrupt.
      (#) Please note also that in interrupt mode, if short circuit detector is
          stopped for one channel, interrupt will be disabled for all channels.

    *** Channel analog watchdog value ***
    =====================================
    [..]    
      (#) Get analog watchdog filter value of a channel using
          HAL_DFSDM_ChannelGetAwdValue().

    *** Channel offset value ***
    =====================================
    [..]    
      (#) Modify offset value of a channel using HAL_DFSDM_ChannelModifyOffset().

    *** Filter initialization ***
    =============================
    [..]
      (#) After channel initialization, user has to init filters.
      (#) As prerequisite, fill in the HAL_DFSDM_FilterMspInit() :
        (++) If interrupt mode is used , enable and configure DFSDMx global
            interrupt with HAL_NVIC_SetPriority() and HAL_NVIC_EnableIRQ().
            Please note that DFSDM0 global interrupt could be already
            enabled if interrupt is used for channel.
        (++) If DMA mode is used, configure DMA with HAL_DMA_Init() and link it
            with DFSDMx filter handle using __HAL_LINKDMA().
      (#) Configure the regular conversion, injected conversion and filter
          parameters for this filter using the HAL_DFSDM_FilterInit() function.

    *** Filter regular channel conversion ***
    =========================================
    [..]    
      (#) Select regular channel and enable/disable continuous mode using
          HAL_DFSDM_FilterConfigRegChannel().
      (#) Start regular conversion using HAL_DFSDM_FilterRegularStart(),
          HAL_DFSDM_FilterRegularStart_IT(), HAL_DFSDM_FilterRegularStart_DMA() or
          HAL_DFSDM_FilterRegularMsbStart_DMA().
      (#) In polling mode, use HAL_DFSDM_FilterPollForRegConversion() to detect 
          the end of regular conversion.
      (#) In interrupt mode, HAL_DFSDM_FilterRegConvCpltCallback() will be called
          at the end of regular conversion.
      (#) Get value of regular conversion and corresponding channel using 
          HAL_DFSDM_FilterGetRegularValue().
      (#) In DMA mode, HAL_DFSDM_FilterRegConvHalfCpltCallback() and 
          HAL_DFSDM_FilterRegConvCpltCallback() will be called respectively at the
          half transfer and at the transfer complete. Please note that 
          HAL_DFSDM_FilterRegConvHalfCpltCallback() will be called only in DMA
          circular mode.
      (#) Stop regular conversion using HAL_DFSDM_FilterRegularStop(),
          HAL_DFSDM_FilterRegularStop_IT() or HAL_DFSDM_FilterRegularStop_DMA().

    *** Filter injected channels conversion ***
    ===========================================
    [..]
      (#) Select injected channels using HAL_DFSDM_FilterConfigInjChannel().
      (#) Start injected conversion using HAL_DFSDM_FilterInjectedStart(),
          HAL_DFSDM_FilterInjectedStart_IT(), HAL_DFSDM_FilterInjectedStart_DMA() or
          HAL_DFSDM_FilterInjectedMsbStart_DMA().
      (#) In polling mode, use HAL_DFSDM_FilterPollForInjConversion() to detect 
          the end of injected conversion.
      (#) In interrupt mode, HAL_DFSDM_FilterInjConvCpltCallback() will be called
          at the end of injected conversion.
      (#) Get value of injected conversion and corresponding channel using 
          HAL_DFSDM_FilterGetInjectedValue().
      (#) In DMA mode, HAL_DFSDM_FilterInjConvHalfCpltCallback() and 
          HAL_DFSDM_FilterInjConvCpltCallback() will be called respectively at the
          half transfer and at the transfer complete. Please note that 
          HAL_DFSDM_FilterInjConvCpltCallback() will be called only in DMA
          circular mode.
      (#) Stop injected conversion using HAL_DFSDM_FilterInjectedStop(),
          HAL_DFSDM_FilterInjectedStop_IT() or HAL_DFSDM_FilterInjectedStop_DMA().

    *** Filter analog watchdog ***
    ==============================
    [..]
      (#) Start filter analog watchdog using HAL_DFSDM_FilterAwdStart_IT().
      (#) HAL_DFSDM_FilterAwdCallback() will be called if analog watchdog occurs.
      (#) Stop filter analog watchdog using HAL_DFSDM_FilterAwdStop_IT().

    *** Filter extreme detector ***
    ===============================
    [..]
      (#) Start filter extreme detector using HAL_DFSDM_FilterExdStart().
      (#) Get extreme detector maximum value using HAL_DFSDM_FilterGetExdMaxValue().
      (#) Get extreme detector minimum value using HAL_DFSDM_FilterGetExdMinValue().
      (#) Start filter extreme detector using HAL_DFSDM_FilterExdStop().

    *** Filter conversion time ***
    ==============================
    [..]
      (#) Get conversion time value using HAL_DFSDM_FilterGetConvTimeValue().

    

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Definition in file stm32l4xx_hal_dfsdm.c.