mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
targets/TARGET_STM/TARGET_STM32L0/device/stm32l0xx_hal_comp_ex.c
- Committer:
- AnnaBridge
- Date:
- 2019-02-20
- Revision:
- 189:f392fc9709a3
- Parent:
- 186:707f6e361f3e
File content as of revision 189:f392fc9709a3:
/** ****************************************************************************** * @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****/