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