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149 lines
5.5 KiB
149 lines
5.5 KiB
/**
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******************************************************************************
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* @file stm32l0xx_hal_comp_ex.c
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* @author MCD Application Team
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* @brief Extended COMP HAL module driver.
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* @brief This file provides firmware functions to manage voltage reference
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* VrefInt that must be specifically controled for comparator
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* instance COMP2.
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@verbatim
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==============================================================================
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##### COMP peripheral Extended features #####
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==============================================================================
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[..] Comparing to other previous devices, the COMP interface for STM32L0XX
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devices contains the following additional features
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(+) Possibility to enable or disable the VREFINT which is used as input
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to the comparator.
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@endverbatim
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32l0xx_hal.h"
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/** @addtogroup STM32L0xx_HAL_Driver
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* @{
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*/
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#ifdef HAL_COMP_MODULE_ENABLED
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/** @addtogroup COMPEx
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* @brief Extended COMP HAL module driver
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* @{
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*/
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/* Private define ------------------------------------------------------------*/
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/** @addtogroup COMP_Private_Constants
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* @{
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*/
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/* Delay for COMP voltage scaler stabilization time (voltage from VrefInt, */
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/* delay based on VrefInt startup time). */
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/* Literal set to maximum value (refer to device datasheet, */
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/* parameter "TVREFINT"). */
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/* Unit: us */
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#define COMP_DELAY_VOLTAGE_SCALER_STAB_US ((uint32_t)3000U) /*!< Delay for COMP voltage scaler stabilization time */
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/**
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* @}
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*/
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/* Exported functions --------------------------------------------------------*/
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/** @addtogroup COMPEx_Exported_Functions
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* @{
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*/
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/** @addtogroup COMPEx_Exported_Functions_Group1
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* @brief Extended functions to manage VREFINT for the comparator
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*
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* @{
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*/
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/**
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* @brief Enable Vrefint and path to comparator, used by comparator
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* instance COMP2 input based on VrefInt or subdivision of VrefInt.
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* @note The equivalent of this function is managed automatically when
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* using function "HAL_COMP_Init()".
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* @note VrefInt requires a startup time
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* (refer to device datasheet, parameter "TVREFINT").
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* This function waits for the startup time
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* (alternative solution: poll for bit SYSCFG_CFGR3_VREFINT_RDYF set).
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* @retval None
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*/
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void HAL_COMPEx_EnableVREFINT(void)
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{
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__IO uint32_t wait_loop_index = 0U;
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/* Enable the Buffer for the COMP by setting ENBUFLP_VREFINT_COMP bit in the CFGR3 register */
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SYSCFG->CFGR3 |= (SYSCFG_CFGR3_ENBUFLP_VREFINT_COMP);
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/* Wait loop initialization and execution */
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/* Note: Variable divided by 2 to compensate partially */
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/* CPU processing cycles. */
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wait_loop_index = (COMP_DELAY_VOLTAGE_SCALER_STAB_US * (SystemCoreClock / (1000000U * 2U)));
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while(wait_loop_index != 0U)
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{
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wait_loop_index--;
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}
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}
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/**
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* @brief Disable Vrefint and path to comparator, used by comparator
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* instance COMP2 input based on VrefInt or subdivision of VrefInt.
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* @retval None
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*/
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void HAL_COMPEx_DisableVREFINT(void)
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{
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/* Disable the Vrefint by resetting ENBUFLP_VREFINT_COMP bit in the CFGR3 register */
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SYSCFG->CFGR3 &= (uint32_t)~((uint32_t)(SYSCFG_CFGR3_ENBUFLP_VREFINT_COMP));
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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/**
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* @}
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*/
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#endif /* HAL_COMP_MODULE_ENABLED */
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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