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2022-10-17 d69aae90ede578aaebc355dafd3496993ccea126

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bfc108	1	/**
Q	2	******************************************************************************
	3	* @file stm32f0xx_hal_comp.c
	4	* @author MCD Application Team
	5	* @brief COMP HAL module driver.
	6	* This file provides firmware functions to manage the following
	7	* functionalities of the COMP peripheral:
	8	* + Initialization/de-initialization functions
	9	* + I/O operation functions
	10	* + Peripheral Control functions
	11	* + Peripheral State functions
	12	*
	13	@verbatim
	14	================================================================================
	15	##### COMP Peripheral features #####
	16	================================================================================
	17
	18	[..]
	19	The STM32F0xx device family integrates up to 2 analog comparators COMP1 and COMP2:
	20	(+) The non inverting input and inverting input can be set to GPIO pins.
	21
	22	(+) The COMP output is available using HAL_COMP_GetOutputLevel()
	23	and can be set on GPIO pins.
	24
	25	(+) The COMP output can be redirected to embedded timers (TIM1, TIM2 and TIM3).
	26
	27	(+) The comparators COMP1 and COMP2 can be combined in window mode.
	28
	29	(+) The comparators have interrupt capability with wake-up
	30	from Sleep and Stop modes (through the EXTI controller):
	31	(++) COMP1 is internally connected to EXTI Line 21
	32	(++) COMP2 is internally connected to EXTI Line 22
	33
	34	(+) From the corresponding IRQ handler, the right interrupt source can be retrieved with the
	35	macros __HAL_COMP_COMP1_EXTI_GET_FLAG() and __HAL_COMP_COMP2_EXTI_GET_FLAG().
	36
	37
	38	##### How to use this driver #####
	39	================================================================================
	40	[..]
	41	This driver provides functions to configure and program the Comparators of STM32F05x, STM32F07x and STM32F09x devices.
	42
	43	To use the comparator, perform the following steps:
	44
	45	(#) Fill in the HAL_COMP_MspInit() to
	46	(++) Configure the comparator input in analog mode using HAL_GPIO_Init()
	47	(++) Configure the comparator output in alternate function mode using HAL_GPIO_Init() to map the comparator
	48	output to the GPIO pin
	49	(++) If required enable the COMP interrupt by configuring and enabling EXTI line in Interrupt mode and
	50	selecting the desired sensitivity level using HAL_GPIO_Init() function. After that enable the comparator
	51	interrupt vector using HAL_NVIC_EnableIRQ() function.
	52
	53	(#) Configure the comparator using HAL_COMP_Init() function:
	54	(++) Select the inverting input (input minus)
	55	(++) Select the non inverting input (input plus)
	56	(++) Select the output polarity
	57	(++) Select the output redirection
	58	(++) Select the hysteresis level
	59	(++) Select the power mode
	60	(++) Select the event/interrupt mode
	61	(++) Select the window mode
	62
	63	-@@- HAL_COMP_Init() calls internally __HAL_RCC_SYSCFG_CLK_ENABLE() in order
	64	to access the comparator(s) registers.
	65
	66	(#) Enable the comparator using HAL_COMP_Start() function or HAL_COMP_Start_IT() function for interrupt mode.
	67
	68	(#) Use HAL_COMP_TriggerCallback() and/or HAL_COMP_GetOutputLevel() functions
	69	to manage comparator outputs (event/interrupt triggered and output level).
	70
	71	(#) Disable the comparator using HAL_COMP_Stop() or HAL_COMP_Stop_IT()
	72	function.
	73
	74	(#) De-initialize the comparator using HAL_COMP_DeInit() function.
	75
	76	(#) For safety purposes comparator(s) can be locked using HAL_COMP_Lock() function.
	77	Only a MCU reset can reset that protection.
	78
	79	@endverbatim
	80	******************************************************************************
	81	* @attention
	82	*
	83	* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
	84	*
	85	* Redistribution and use in source and binary forms, with or without modification,
	86	* are permitted provided that the following conditions are met:
	87	* 1. Redistributions of source code must retain the above copyright notice,
	88	* this list of conditions and the following disclaimer.
	89	* 2. Redistributions in binary form must reproduce the above copyright notice,
	90	* this list of conditions and the following disclaimer in the documentation
	91	* and/or other materials provided with the distribution.
	92	* 3. Neither the name of STMicroelectronics nor the names of its contributors
	93	* may be used to endorse or promote products derived from this software
	94	* without specific prior written permission.
	95	*
	96	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	97	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	98	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	99	* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
	100	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	101	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	102	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	103	* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	104	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	105	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	106	*
	107	******************************************************************************
	108	*/
	109
	110	/*
	111	Additional Tables:
	112
	113	Table 1. COMP Inputs for the STM32F05x, STM32F07x and STM32F09x devices
	114	+--------------------------------------------------+
	115	\| \| \| COMP1 \| COMP2 \|
	116	\|-----------------\|----------------\|---------------\|
	117	\| \| 1/4 VREFINT \| OK \| OK \|
	118	\| \| 1/2 VREFINT \| OK \| OK \|
	119	\| \| 3/4 VREFINT \| OK \| OK \|
	120	\| Inverting Input \| VREFINT \| OK \| OK \|
	121	\| \| DAC1 OUT (PA4) \| OK \| OK \|
	122	\| \| DAC2 OUT (PA5) \| OK \| OK \|
	123	\| \| IO1 \| PA0 \| PA2 \|
	124	\|-----------------\|----------------\|-------\|-------\|
	125	\| Non Inverting \| \| PA1 \| PA3 \|
	126	\| Input \| \| \| \|
	127	+--------------------------------------------------+
	128
	129	Table 2. COMP Outputs for the STM32F05x, STM32F07x and STM32F09x devices
	130	+---------------+
	131	\| COMP1 \| COMP2 \|
	132	\|-------\|-------\|
	133	\| PA0 \| PA2 \|
	134	\| PA6 \| PA7 \|
	135	\| PA11 \| PA12 \|
	136	+---------------+
	137
	138	Table 3. COMP Outputs redirection to embedded timers for the STM32F05x, STM32F07x and STM32F09x devices
	139	+---------------------------------+
	140	\| COMP1 \| COMP2 \|
	141	\|----------------\|----------------\|
	142	\| TIM1 BKIN \| TIM1 BKIN \|
	143	\| \| \|
	144	\| TIM1 OCREFCLR \| TIM1 OCREFCLR \|
	145	\| \| \|
	146	\| TIM1 IC1 \| TIM1 IC1 \|
	147	\| \| \|
	148	\| TIM2 IC4 \| TIM2 IC4 \|
	149	\| \| \|
	150	\| TIM2 OCREFCLR \| TIM2 OCREFCLR \|
	151	\| \| \|
	152	\| TIM3 IC1 \| TIM3 IC1 \|
	153	\| \| \|
	154	\| TIM3 OCREFCLR \| TIM3 OCREFCLR \|
	155	+---------------------------------+
	156
	157	*/
	158
	159	/* Includes ------------------------------------------------------------------*/
	160	#include "stm32f0xx_hal.h"
	161
	162	#ifdef HAL_COMP_MODULE_ENABLED
	163
	164	#if defined(STM32F051x8) \|\| defined(STM32F058xx) \|\| \
	165	defined(STM32F071xB) \|\| defined(STM32F072xB) \|\| defined(STM32F078xx) \|\| \
	166	defined(STM32F091xC) \|\| defined (STM32F098xx)
	167
	168	/** @addtogroup STM32F0xx_HAL_Driver
	169	* @{
	170	*/
	171
	172	/** @defgroup COMP COMP
	173	* @brief COMP HAL module driver
	174	* @{
	175	*/
	176
	177	/* Private typedef -----------------------------------------------------------*/
	178	/* Private define ------------------------------------------------------------*/
	179
	180	/** @defgroup COMP_Private_Constants COMP Private Constants
	181	* @{
	182	*/
	183
	184	/* Delay for COMP startup time. */
	185	/* Note: Delay required to reach propagation delay specification. */
	186	/* Literal set to maximum value (refer to device datasheet, */
	187	/* parameter "tSTART"). */
	188	/* Unit: us */
	189	#define COMP_DELAY_STARTUP_US (60U) /!< Delay for COMP startup time /
	190
	191	/* CSR register reset value */
	192	#define COMP_CSR_RESET_VALUE (0x00000000U)
	193	/* CSR register masks */
	194	#define COMP_CSR_RESET_PARAMETERS_MASK (0x00003FFFU)
	195	#define COMP_CSR_UPDATE_PARAMETERS_MASK (0x00003FFEU)
	196	/* CSR COMPx non inverting input mask */
	197	#define COMP_CSR_COMPxNONINSEL_MASK ((uint16_t)COMP_CSR_COMP1SW1)
	198	/* CSR COMP2 shift */
	199	#define COMP_CSR_COMP1_SHIFT 0U
	200	#define COMP_CSR_COMP2_SHIFT 16U
	201	/**
	202	* @}
	203	*/
	204	/* Private macro -------------------------------------------------------------*/
	205	/* Private variables ---------------------------------------------------------*/
	206	/* Private function prototypes -----------------------------------------------*/
	207	/* Private functions ---------------------------------------------------------*/
	208
	209	/** @defgroup COMP_Exported_Functions COMP Exported Functions
	210	* @{
	211	*/
	212
	213	/** @defgroup COMP_Exported_Functions_Group1 Initialization/de-initialization functions
	214	* @brief Initialization and Configuration functions
	215	*
	216	@verbatim
	217	===============================================================================
	218	##### Initialization and Configuration functions #####
	219	===============================================================================
	220	[..] This section provides functions to initialize and de-initialize comparators
	221
	222	@endverbatim
	223	* @{
	224	*/
	225
	226	/**
	227	* @brief Initializes the COMP according to the specified
	228	* parameters in the COMP_InitTypeDef and create the associated handle.
	229	* @note If the selected comparator is locked, initialization can't be performed.
	230	* To unlock the configuration, perform a system reset.
	231	* @param hcomp COMP handle
	232	* @retval HAL status
	233	*/
	234	HAL_StatusTypeDef HAL_COMP_Init(COMP_HandleTypeDef *hcomp)
	235	{
	236	HAL_StatusTypeDef status = HAL_OK;
	237	uint32_t regshift = COMP_CSR_COMP1_SHIFT;
	238
	239	/* Check the COMP handle allocation and lock status */
	240	if((hcomp == NULL) \|\| ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
	241	{
	242	status = HAL_ERROR;
	243	}
	244	else
	245	{
	246	/* Check the parameter */
	247	assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
	248	assert_param(IS_COMP_INVERTINGINPUT(hcomp->Init.InvertingInput));
	249	assert_param(IS_COMP_NONINVERTINGINPUT(hcomp->Init.NonInvertingInput));
	250	assert_param(IS_COMP_OUTPUT(hcomp->Init.Output));
	251	assert_param(IS_COMP_OUTPUTPOL(hcomp->Init.OutputPol));
	252	assert_param(IS_COMP_HYSTERESIS(hcomp->Init.Hysteresis));
	253	assert_param(IS_COMP_MODE(hcomp->Init.Mode));
	254
	255	if(hcomp->Init.NonInvertingInput == COMP_NONINVERTINGINPUT_DAC1SWITCHCLOSED)
	256	{
	257	assert_param(IS_COMP_DAC1SWITCH_INSTANCE(hcomp->Instance));
	258	}
	259
	260	if(hcomp->Init.WindowMode != COMP_WINDOWMODE_DISABLE)
	261	{
	262	assert_param(IS_COMP_WINDOWMODE_INSTANCE(hcomp->Instance));
	263	}
	264
	265	/* Init SYSCFG and the low level hardware to access comparators */
	266	__HAL_RCC_SYSCFG_CLK_ENABLE();
	267
	268	/* Init the low level hardware : SYSCFG to access comparators */
	269	HAL_COMP_MspInit(hcomp);
	270
	271	if(hcomp->State == HAL_COMP_STATE_RESET)
	272	{
	273	/* Allocate lock resource and initialize it */
	274	hcomp->Lock = HAL_UNLOCKED;
	275	}
	276
	277	/* Change COMP peripheral state */
	278	hcomp->State = HAL_COMP_STATE_BUSY;
	279
	280	/* Set COMP parameters */
	281	/* Set COMPxINSEL bits according to hcomp->Init.InvertingInput value */
	282	/* Set COMPxOUTSEL bits according to hcomp->Init.Output value */
	283	/* Set COMPxPOL bit according to hcomp->Init.OutputPol value */
	284	/* Set COMPxHYST bits according to hcomp->Init.Hysteresis value */
	285	/* Set COMPxMODE bits according to hcomp->Init.Mode value */
	286	if(hcomp->Instance == COMP2)
	287	{
	288	regshift = COMP_CSR_COMP2_SHIFT;
	289	}
	290	MODIFY_REG(COMP->CSR,
	291	(COMP_CSR_COMPxINSEL \| COMP_CSR_COMPxNONINSEL_MASK \| \
	292	COMP_CSR_COMPxOUTSEL \| COMP_CSR_COMPxPOL \| \
	293	COMP_CSR_COMPxHYST \| COMP_CSR_COMPxMODE) << regshift,
	294	(hcomp->Init.InvertingInput \| \
	295	hcomp->Init.NonInvertingInput \| \
	296	hcomp->Init.Output \| \
	297	hcomp->Init.OutputPol \| \
	298	hcomp->Init.Hysteresis \| \
	299	hcomp->Init.Mode) << regshift);
	300
	301	if(hcomp->Init.WindowMode != COMP_WINDOWMODE_DISABLE)
	302	{
	303	COMP->CSR \|= COMP_CSR_WNDWEN;
	304	}
	305
	306	/* Initialize the COMP state*/
	307	hcomp->State = HAL_COMP_STATE_READY;
	308	}
	309
	310	return status;
	311	}
	312
	313	/**
	314	* @brief DeInitializes the COMP peripheral
	315	* @note Deinitialization can't be performed if the COMP configuration is locked.
	316	* To unlock the configuration, perform a system reset.
	317	* @param hcomp COMP handle
	318	* @retval HAL status
	319	*/
	320	HAL_StatusTypeDef HAL_COMP_DeInit(COMP_HandleTypeDef *hcomp)
	321	{
	322	HAL_StatusTypeDef status = HAL_OK;
	323	uint32_t regshift = COMP_CSR_COMP1_SHIFT;
	324
	325	/* Check the COMP handle allocation and lock status */
	326	if((hcomp == NULL) \|\| ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
	327	{
	328	status = HAL_ERROR;
	329	}
	330	else
	331	{
	332	/* Check the parameter */
	333	assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
	334
	335	/* Set COMP_CSR register to reset value for the corresponding COMP instance */
	336	if(hcomp->Instance == COMP2)
	337	{
	338	regshift = COMP_CSR_COMP2_SHIFT;
	339	}
	340	MODIFY_REG(COMP->CSR,
	341	COMP_CSR_RESET_PARAMETERS_MASK << regshift,
	342	COMP_CSR_RESET_VALUE << regshift);
	343
	344	/* DeInit the low level hardware: SYSCFG, GPIO, CLOCK and NVIC */
	345	HAL_COMP_MspDeInit(hcomp);
	346
	347	hcomp->State = HAL_COMP_STATE_RESET;
	348
	349	/* Release Lock */
	350	__HAL_UNLOCK(hcomp);
	351	}
	352
	353	return status;
	354	}
	355
	356	/**
	357	* @brief Initializes the COMP MSP.
	358	* @param hcomp COMP handle
	359	* @retval None
	360	*/
	361	__weak void HAL_COMP_MspInit(COMP_HandleTypeDef *hcomp)
	362	{
	363	/* Prevent unused argument(s) compilation warning */
	364	UNUSED(hcomp);
	365
	366	/* NOTE : This function Should not be modified, when the callback is needed,
	367	the HAL_COMP_MspInit could be implenetd in the user file
	368	*/
	369	}
	370
	371	/**
	372	* @brief DeInitializes COMP MSP.
	373	* @param hcomp COMP handle
	374	* @retval None
	375	*/
	376	__weak void HAL_COMP_MspDeInit(COMP_HandleTypeDef *hcomp)
	377	{
	378	/* Prevent unused argument(s) compilation warning */
	379	UNUSED(hcomp);
	380
	381	/* NOTE : This function Should not be modified, when the callback is needed,
	382	the HAL_COMP_MspDeInit could be implenetd in the user file
	383	*/
	384	}
	385
	386	/**
	387	* @}
	388	*/
	389
	390	/** @defgroup COMP_Exported_Functions_Group2 I/O operation functions
	391	* @brief Data transfers functions
	392	*
	393	@verbatim
	394	===============================================================================
	395	##### IO operation functions #####
	396	===============================================================================
	397	[..]
	398	This subsection provides a set of functions allowing to manage the COMP data
	399	transfers.
	400
	401	@endverbatim
	402	* @{
	403	*/
	404
	405	/**
	406	* @brief Start the comparator
	407	* @param hcomp COMP handle
	408	* @retval HAL status
	409	*/
	410	HAL_StatusTypeDef HAL_COMP_Start(COMP_HandleTypeDef *hcomp)
	411	{
	412	uint32_t wait_loop_index = 0U;
	413	HAL_StatusTypeDef status = HAL_OK;
	414	uint32_t regshift = COMP_CSR_COMP1_SHIFT;
	415
	416	/* Check the COMP handle allocation and lock status */
	417	if((hcomp == NULL) \|\| ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
	418	{
	419	status = HAL_ERROR;
	420	}
	421	else
	422	{
	423	/* Check the parameter */
	424	assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
	425
	426	if(hcomp->State == HAL_COMP_STATE_READY)
	427	{
	428	/* Enable the selected comparator */
	429	if(hcomp->Instance == COMP2)
	430	{
	431	regshift = COMP_CSR_COMP2_SHIFT;
	432	}
	433	SET_BIT(COMP->CSR, COMP_CSR_COMPxEN << regshift);
	434
	435	/* Set HAL COMP handle state */
	436	hcomp->State = HAL_COMP_STATE_BUSY;
	437
	438	/* Delay for COMP startup time */
	439	wait_loop_index = (COMP_DELAY_STARTUP_US * (SystemCoreClock / 1000000U));
	440	while(wait_loop_index != 0U)
	441	{
	442	wait_loop_index--;
	443	}
	444	}
	445	else
	446	{
	447	status = HAL_ERROR;
	448	}
	449	}
	450
	451	return status;
	452	}
	453
	454	/**
	455	* @brief Stop the comparator
	456	* @param hcomp COMP handle
	457	* @retval HAL status
	458	*/
	459	HAL_StatusTypeDef HAL_COMP_Stop(COMP_HandleTypeDef *hcomp)
	460	{
	461	HAL_StatusTypeDef status = HAL_OK;
	462	uint32_t regshift = COMP_CSR_COMP1_SHIFT;
	463
	464	/* Check the COMP handle allocation and lock status */
	465	if((hcomp == NULL) \|\| ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
	466	{
	467	status = HAL_ERROR;
	468	}
	469	else
	470	{
	471	/* Check the parameter */
	472	assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
	473
	474	if(hcomp->State == HAL_COMP_STATE_BUSY)
	475	{
	476	/* Disable the selected comparator */
	477	if(hcomp->Instance == COMP2)
	478	{
	479	regshift = COMP_CSR_COMP2_SHIFT;
	480	}
	481	CLEAR_BIT(COMP->CSR, COMP_CSR_COMPxEN << regshift);
	482
	483	hcomp->State = HAL_COMP_STATE_READY;
	484	}
	485	else
	486	{
	487	status = HAL_ERROR;
	488	}
	489	}
	490
	491	return status;
	492	}
	493
	494	/**
	495	* @brief Enables the interrupt and starts the comparator
	496	* @param hcomp COMP handle
	497	* @retval HAL status.
	498	*/
	499	HAL_StatusTypeDef HAL_COMP_Start_IT(COMP_HandleTypeDef *hcomp)
	500	{
	501	HAL_StatusTypeDef status = HAL_OK;
	502	uint32_t extiline = 0U;
	503
	504	/* Check the parameter */
	505	assert_param(IS_COMP_TRIGGERMODE(hcomp->Init.TriggerMode));
	506
	507	status = HAL_COMP_Start(hcomp);
	508	if(status == HAL_OK)
	509	{
	510	/* Check the Exti Line output configuration */
	511	extiline = COMP_GET_EXTI_LINE(hcomp->Instance);
	512	/* Configure the rising edge */
	513	if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_IT_RISING) != RESET)
	514	{
	515	SET_BIT(EXTI->RTSR, extiline);
	516	}
	517	else
	518	{
	519	CLEAR_BIT(EXTI->RTSR, extiline);
	520	}
	521	/* Configure the falling edge */
	522	if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_IT_FALLING) != RESET)
	523	{
	524	SET_BIT(EXTI->FTSR, extiline);
	525	}
	526	else
	527	{
	528	CLEAR_BIT(EXTI->FTSR, extiline);
	529	}
	530
	531	/* Clear COMP EXTI pending bit */
	532	WRITE_REG(EXTI->PR, extiline);
	533
	534	/* Enable Exti interrupt mode */
	535	SET_BIT(EXTI->IMR, extiline);
	536	}
	537
	538	return status;
	539	}
	540
	541	/**
	542	* @brief Disable the interrupt and Stop the comparator
	543	* @param hcomp COMP handle
	544	* @retval HAL status
	545	*/
	546	HAL_StatusTypeDef HAL_COMP_Stop_IT(COMP_HandleTypeDef *hcomp)
	547	{
	548	HAL_StatusTypeDef status = HAL_OK;
	549
	550	/* Disable the Exti Line interrupt mode */
	551	CLEAR_BIT(EXTI->IMR, COMP_GET_EXTI_LINE(hcomp->Instance));
	552
	553	status = HAL_COMP_Stop(hcomp);
	554
	555	return status;
	556	}
	557
	558	/**
	559	* @brief Comparator IRQ Handler
	560	* @param hcomp COMP handle
	561	* @retval HAL status
	562	*/
	563	void HAL_COMP_IRQHandler(COMP_HandleTypeDef *hcomp)
	564	{
	565	uint32_t extiline = COMP_GET_EXTI_LINE(hcomp->Instance);
	566
	567	/* Check COMP Exti flag */
	568	if(READ_BIT(EXTI->PR, extiline) != RESET)
	569	{
	570	/* Clear COMP Exti pending bit */
	571	WRITE_REG(EXTI->PR, extiline);
	572
	573	/* COMP trigger user callback */
	574	HAL_COMP_TriggerCallback(hcomp);
	575	}
	576	}
	577
	578	/**
	579	* @}
	580	*/
	581
	582	/** @defgroup COMP_Exported_Functions_Group3 Peripheral Control functions
	583	* @brief management functions
	584	*
	585	@verbatim
	586	===============================================================================
	587	##### Peripheral Control functions #####
	588	===============================================================================
	589	[..]
	590	This subsection provides a set of functions allowing to control the COMP data
	591	transfers.
	592
	593	@endverbatim
	594	* @{
	595	*/
	596
	597	/**
	598	* @brief Lock the selected comparator configuration.
	599	* @param hcomp COMP handle
	600	* @retval HAL status
	601	*/
	602	HAL_StatusTypeDef HAL_COMP_Lock(COMP_HandleTypeDef *hcomp)
	603	{
	604	HAL_StatusTypeDef status = HAL_OK;
	605	uint32_t regshift = COMP_CSR_COMP1_SHIFT;
	606
	607	/* Check the COMP handle allocation and lock status */
	608	if((hcomp == NULL) \|\| ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
	609	{
	610	status = HAL_ERROR;
	611	}
	612	else
	613	{
	614	/* Check the parameter */
	615	assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
	616
	617	/* Set lock flag */
	618	hcomp->State \|= COMP_STATE_BIT_LOCK;
	619
	620	/* Set the lock bit corresponding to selected comparator */
	621	if(hcomp->Instance == COMP2)
	622	{
	623	regshift = COMP_CSR_COMP2_SHIFT;
	624	}
	625	SET_BIT(COMP->CSR, COMP_CSR_COMPxLOCK << regshift);
	626	}
	627
	628	return status;
	629	}
	630
	631	/**
	632	* @brief Return the output level (high or low) of the selected comparator.
	633	* The output level depends on the selected polarity.
	634	* If the polarity is not inverted:
	635	* - Comparator output is low when the non-inverting input is at a lower
	636	* voltage than the inverting input
	637	* - Comparator output is high when the non-inverting input is at a higher
	638	* voltage than the inverting input
	639	* If the polarity is inverted:
	640	* - Comparator output is high when the non-inverting input is at a lower
	641	* voltage than the inverting input
	642	* - Comparator output is low when the non-inverting input is at a higher
	643	* voltage than the inverting input
	644	* @param hcomp COMP handle
	645	* @retval Returns the selected comparator output level: COMP_OUTPUTLEVEL_LOW or COMP_OUTPUTLEVEL_HIGH.
	646	*
	647	*/
	648	uint32_t HAL_COMP_GetOutputLevel(COMP_HandleTypeDef *hcomp)
	649	{
	650	uint32_t level=0;
	651	uint32_t regshift = COMP_CSR_COMP1_SHIFT;
	652
	653	/* Check the parameter */
	654	assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
	655
	656	if(hcomp->Instance == COMP2)
	657	{
	658	regshift = COMP_CSR_COMP2_SHIFT;
	659	}
	660	level = READ_BIT(COMP->CSR, COMP_CSR_COMPxOUT << regshift);
	661
	662	if(level != 0U)
	663	{
	664	return(COMP_OUTPUTLEVEL_HIGH);
	665	}
	666	return(COMP_OUTPUTLEVEL_LOW);
	667	}
	668
	669	/**
	670	* @brief Comparator callback.
	671	* @param hcomp COMP handle
	672	* @retval None
	673	*/
	674	__weak void HAL_COMP_TriggerCallback(COMP_HandleTypeDef *hcomp)
	675	{
	676	/* Prevent unused argument(s) compilation warning */
	677	UNUSED(hcomp);
	678
	679	/* NOTE : This function should not be modified, when the callback is needed,
	680	the HAL_COMP_TriggerCallback should be implemented in the user file
	681	*/
	682	}
	683
	684
	685	/**
	686	* @}
	687	*/
	688
	689	/** @defgroup COMP_Exported_Functions_Group4 Peripheral State functions
	690	* @brief Peripheral State functions
	691	*
	692	@verbatim
	693	===============================================================================
	694	##### Peripheral State functions #####
	695	===============================================================================
	696	[..]
	697	This subsection permit to get in run-time the status of the peripheral
	698	and the data flow.
	699
	700	@endverbatim
	701	* @{
	702	*/
	703
	704	/**
	705	* @brief Return the COMP state
	706	* @param hcomp COMP handle
	707	* @retval HAL state
	708	*/
	709	uint32_t HAL_COMP_GetState(COMP_HandleTypeDef *hcomp)
	710	{
	711	/* Check the COMP handle allocation */
	712	if(hcomp == NULL)
	713	{
	714	return HAL_COMP_STATE_RESET;
	715	}
	716
	717	/* Check the parameter */
	718	assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
	719
	720	return hcomp->State;
	721	}
	722	/**
	723	* @}
	724	*/
	725
	726	/**
	727	* @}
	728	*/
	729
	730	/**
	731	* @}
	732	*/
	733
	734	/**
	735	* @}
	736	*/
	737
	738	#endif /* STM32F051x8 \|\| STM32F058xx \|\| */
	739	/* STM32F071xB \|\| STM32F072xB \|\| STM32F078xx \|\| */
	740	/* STM32F091xC \|\| defined (STM32F098xx) */
	741
	742	#endif /* HAL_COMP_MODULE_ENABLED */
	743
	744	/********************** (C) COPYRIGHT STMicroelectronics *END OF FILE**/