| /** |
| ****************************************************************************** |
| * @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****/ |