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cy_capsense_filter.c
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/***************************************************************************//**
* \file cy_capsense_filter.c
* \version 6.10.0
*
* \brief
* This file contains the source code of all filters implementation.
*
********************************************************************************
* \copyright
* Copyright 2018-2025, Cypress Semiconductor Corporation (an Infineon company)
* or an affiliate of Cypress Semiconductor Corporation. All rights reserved.
* You may use this file only in accordance with the license, terms, conditions,
* disclaimers, and limitations in the end user license agreement accompanying
* the software package with which this file was provided.
*******************************************************************************/
#include <stddef.h>
#include "cycfg_capsense_defines.h"
#include "cy_capsense_filter.h"
#include "cy_capsense_common.h"
#include "cy_capsense_lib.h"
#if (defined(CY_IP_MXCSDV2) || defined(CY_IP_M0S8CSDV2) || defined(CY_IP_M0S8MSCV3) || defined(CY_IP_M0S8MSCV3LP))
/*******************************************************************************
* Local definition
*******************************************************************************/
#define CY_CAPSENSE_IIR_BL_SHIFT (8u)
#define CY_CAPSENSE_IIR_SHIFT_STANDARD (0u)
#define CY_CAPSENSE_IIR_SHIFT_PERFORMANCE (8u)
#define CY_CAPSENSE_RC_MEDIAN_SIZE (2u)
#define CY_CAPSENSE_RC_IIR_SIZE (1u)
#define CY_CAPSENSE_RC_AVG_SIZE (3u)
/* IIR filter constant */
#define CY_CAPSENSE_IIR_COEFFICIENT_K (256u)
/******************************************************************************/
/** \cond SECTION_CAPSENSE_INTERNAL */
/** \addtogroup group_capsense_internal *//** \{ */
/******************************************************************************/
static cy_capsense_status_t Cy_CapSense_CheckBaselineInv(
cy_stc_capsense_widget_context_t * ptrWdContext,
const cy_stc_capsense_sensor_context_t * ptrSnsContext,
const uint16_t * ptrSnsBslnInv,
const cy_stc_capsense_context_t * context);
/** \} \endcond */
/*******************************************************************************
* Function Name: Cy_CapSense_UpdateAllBaselines
****************************************************************************//**
*
* Updates the baseline for all the sensors in all the active widgets
* (skipping low power widgets).
*
* Baselines must be updated after sensor scan to ignore low frequency
* changes in the sensor data caused by environment changes such as
* temperature from sensor status decision.
*
* This function ignores the widget enable bit in the widget status register.
* Calling this function multiple times without a new sensor scan leads to
* unexpected behavior and should be avoided.
*
* This function is called by Cy_CapSense_ProcessAllWidgets() and
* Cy_CapSense_ProcessWidget(), hence the application program need not use this
* function if any of the above functions is already used. This function can be
* used for custom application implementation.
*
* \note For the fifth-generation low power CAPSENSE™ widgets
* of the \ref CY_CAPSENSE_WD_LOW_POWER_E type are not processed.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns the status of the update baseline operation of all the widgets:
* - CY_CAPSENSE_STATUS_SUCCESS - The operation is successfully completed.
* - CY_CAPSENSE_STATUS_BAD_DATA - The baseline processing failed.
*
*******************************************************************************/
cy_capsense_status_t Cy_CapSense_UpdateAllBaselines(
const cy_stc_capsense_context_t * context)
{
uint32_t wdIndex;
cy_capsense_status_t bslnStatus = CY_CAPSENSE_STATUS_SUCCESS;
for (wdIndex = CY_CAPSENSE_TOTAL_WIDGET_COUNT; wdIndex-- > 0u;)
{
#if (CY_CAPSENSE_PLATFORM_BLOCK_FIFTH_GEN_LP)
if ((uint8_t)CY_CAPSENSE_WD_LOW_POWER_E != context->ptrWdConfig[wdIndex].wdType)
#endif /* CY_CAPSENSE_PLATFORM_BLOCK_FIFTH_GEN_LP */
{
bslnStatus |= Cy_CapSense_UpdateWidgetBaseline(wdIndex, context);
}
}
return bslnStatus;
}
/*******************************************************************************
* Function Name: Cy_CapSense_UpdateWidgetBaseline
****************************************************************************//**
*
* Updates the baselines for all the sensors in a widget specified by
* the input parameter.
*
* This function performs exactly the same tasks as
* Cy_CapSense_UpdateAllBaselines() but only for a specified widget.
*
* Calling this function multiple times without a new sensor scan leads to
* unexpected behavior and should be avoided. The application program need
* not use this function if the Cy_CapSense_UpdateAllBaselines(),
* Cy_CapSense_ProcessAllWidgets() or Cy_CapSense_ProcessWidget() functions
* are already used.
*
* \param widgetId
* Specifies the ID number of the widget. A macro for the widget ID can be found
* in the cycfg_capsense.h file defined as CY_CAPSENSE_<WIDGET_NAME>_WDGT_ID.
*
* \note For the fifth-generation low power CAPSENSE™ widgets
* of the \ref CY_CAPSENSE_WD_LOW_POWER_E type are not processed and
* \ref CY_CAPSENSE_STATUS_BAD_PARAM is returned
* if a widget of this type is passed.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns the status of the specified widget update baseline operation:
* - CY_CAPSENSE_STATUS_SUCCESS - The operation is successfully completed.
* - CY_CAPSENSE_STATUS_BAD_PARAM - The input parameter is invalid.
* - CY_CAPSENSE_STATUS_BAD_DATA - The baseline processing failed.
*
*******************************************************************************/
cy_capsense_status_t Cy_CapSense_UpdateWidgetBaseline(
uint32_t widgetId,
const cy_stc_capsense_context_t * context)
{
uint32_t snsIndex;
cy_capsense_status_t bslnStatus = CY_CAPSENSE_STATUS_BAD_PARAM;
#if (CY_CAPSENSE_PLATFORM_BLOCK_FIFTH_GEN_LP)
if ((uint8_t)CY_CAPSENSE_WD_LOW_POWER_E != context->ptrWdConfig[widgetId].wdType)
#endif /* CY_CAPSENSE_PLATFORM_BLOCK_FIFTH_GEN_LP */
{
bslnStatus = CY_CAPSENSE_STATUS_SUCCESS;
for (snsIndex = context->ptrWdConfig[widgetId].numSns; snsIndex-- > 0u;)
{
bslnStatus |= Cy_CapSense_UpdateSensorBaseline(widgetId, snsIndex, context);
}
}
return bslnStatus;
}
/*******************************************************************************
* Function Name: Cy_CapSense_UpdateSensorBaseline
****************************************************************************//**
*
* Updates the baseline for a sensor in a widget specified by the
* input parameters.
*
* This function performs exactly the same tasks as
* Cy_CapSense_UpdateAllBaselines() and Cy_CapSense_UpdateWidgetBaseline()
* but only for a specified sensor.
*
* Calling this function multiple times without a new sensor scan leads to
* unexpected behavior and should be avoided. The application need not use
* this function if the Cy_CapSense_UpdateWidgetBaseline (),
* Cy_CapSense_UpdateAllBaselines (), Cy_CapSense_ProcessAllWidgets(),
* or Cy_CapSense_ProcessWidget() functions are already used.
*
* \param widgetId
* Specifies the ID number of the widget. A macro for the widget ID can be found
* in the cycfg_capsense.h file defined as CY_CAPSENSE_<WIDGET_NAME>_WDGT_ID.
*
* \note For the fifth-generation low power CAPSENSE™ it is not recommended
* to call this function for widgets of the \ref CY_CAPSENSE_WD_LOW_POWER_E type.
*
* \param sensorId
* Specifies the ID number of the sensor within the widget. A macro for the
* sensor ID within a specified widget can be found in the cycfg_capsense.h
* file defined as CY_CAPSENSE_<WIDGET_NAME>_SNS<SENSOR_NUMBER>_ID.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns the status of the specified sensor update baseline operation:
* - CY_CAPSENSE_STATUS_SUCCESS - The operation is successfully completed.
* - CY_CAPSENSE_STATUS_BAD_PARAM - The input parameter is invalid.
* - CY_CAPSENSE_STATUS_BAD_DATA - The baseline processing failed.
*
*******************************************************************************/
cy_capsense_status_t Cy_CapSense_UpdateSensorBaseline(
uint32_t widgetId,
uint32_t sensorId,
const cy_stc_capsense_context_t * context)
{
cy_capsense_status_t bslnStatus = CY_CAPSENSE_STATUS_BAD_PARAM;
const cy_stc_capsense_widget_config_t * ptrWdCfg = &context->ptrWdConfig[widgetId];
cy_stc_capsense_sensor_context_t * ptrSnsCxt = &ptrWdCfg->ptrSnsContext[sensorId];
bslnStatus = Cy_CapSense_FtUpdateBaseline(ptrWdCfg->ptrWdContext, ptrSnsCxt, &ptrWdCfg->ptrBslnInv[sensorId], context);
return bslnStatus;
}
/*******************************************************************************
* Function Name: Cy_CapSense_CheckBaselineInv
****************************************************************************//**
*
* Check a matching of present baseline and its inverse duplication.
*
* \param ptrWdContext
* The pointer to the widget context structure where all the widget parameters
* are stored.
*
* \param ptrSnsContext
* The pointer to the sensor context structure where the sensor data
* is stored.
*
* \param ptrSnsBslnInv
* The pointer to the sensor baseline inversion used for BIST if enabled.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns a status indicating check result:
* - CY_CAPSENSE_STATUS_SUCCESS - if the BIST baseline integrity test is enabled and
* baseline and its inverse duplication match or BIST
* baseline integrity test is disabled.
* - CY_CAPSENSE_STATUS_BAD_DATA - if the BIST baseline integrity test is enabled and
* the sensor's baseline and its inversion doesn't
* match. In this case the function as well clears
* the bit[2] (Widget Working) of the .status field
* in the widget context structure preventing corrupted
* data usage and set the CY_CAPSENSE_BIST_BSLN_INTEGRITY_MASK
* bit of the .testResultMask field
* in the /ref cy_stc_capsense_bist_context_t structure.
*
*******************************************************************************/
static cy_capsense_status_t Cy_CapSense_CheckBaselineInv(
cy_stc_capsense_widget_context_t * ptrWdContext,
const cy_stc_capsense_sensor_context_t * ptrSnsContext,
const uint16_t * ptrSnsBslnInv,
const cy_stc_capsense_context_t * context)
{
cy_capsense_status_t result = CY_CAPSENSE_STATUS_SUCCESS;
#if ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_BIST_EN) &&\
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_BSLN_INTEGRITY_EN))
uint16_t bslnInv = (uint16_t)(~ptrSnsContext->bsln);
if (*ptrSnsBslnInv != bslnInv)
{
result = CY_CAPSENSE_STATUS_BAD_DATA;
ptrWdContext->status &= (uint8_t)~CY_CAPSENSE_WD_WORKING_MASK;
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_BSLN_INTEGRITY_MASK;
}
#else
(void)ptrWdContext;
(void)ptrSnsContext;
(void)ptrSnsBslnInv;
(void)context;
#endif /* ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_BIST_EN) &&\
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_BSLN_INTEGRITY_EN)) */
return result;
}
/*******************************************************************************
* Function Name: Cy_CapSense_FtUpdateBaseline
****************************************************************************//**
*
* Updates the baseline for a sensor specified by an input parameter.
*
* Check a matching of present baseline and its inverse duplication. If they
* match, then the function updates the baseline for a sensor specified by an input parameter.
* If they don't match, the function returns CY_CAPSENSE_TST_BSLN_DUPLICATION
* result and doesn't update the baseline.
*
* \param ptrWdContext
* The pointer to the widget context structure where all the widget parameters
* are stored.
*
* \param ptrSnsContext
* The pointer to the sensor context structure where the sensor data
* is stored.
*
* \param ptrSnsBslnInv
* The pointer to the sensor baseline inversion used for BIST if enabled.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns a status indicating whether the baseline has been updated:
* - CY_CAPSENSE_STATUS_SUCCESS - if baseline updating was successful.
* - CY_CAPSENSE_STATUS_BAD_DATA - if the BIST baseline integrity test is enabled and
* the sensor's baseline and its inversion doesn't
* match. In this case the function as well clears
* the bit[2] (Widget Working) of the .status field
* in the widget context structure preventing corrupted
* data usage and set the CY_CAPSENSE_BIST_BSLN_INTEGRITY_MASK
* bit of the .testResultMask field
* in the /ref cy_stc_capsense_bist_context_t structure.
*
*******************************************************************************/
cy_capsense_status_t Cy_CapSense_FtUpdateBaseline(
cy_stc_capsense_widget_context_t * ptrWdContext,
cy_stc_capsense_sensor_context_t * ptrSnsContext,
uint16_t * ptrSnsBslnInv,
const cy_stc_capsense_context_t * context)
{
cy_capsense_status_t result;
uint32_t bslnHistory;
result = Cy_CapSense_CheckBaselineInv(ptrWdContext, ptrSnsContext, ptrSnsBslnInv, context);
if (CY_CAPSENSE_STATUS_SUCCESS == result)
{
/* Reset negative baseline counter */
if (ptrSnsContext->raw >= ptrSnsContext->bsln)
{
ptrSnsContext->negBslnRstCnt = 0u;
}
/* Reset baseline */
if ((uint32_t)ptrSnsContext->bsln > ((uint32_t)ptrWdContext->nNoiseTh + ptrSnsContext->raw))
{
if (ptrSnsContext->negBslnRstCnt >= ptrWdContext->lowBslnRst)
{
Cy_CapSense_FtInitializeBaseline(ptrSnsContext);
}
else
{
ptrSnsContext->negBslnRstCnt++;
}
}
else
{
/*
* Update baseline only if:
* - signal is in range between noiseThreshold and negativenoiseThreshold
* or
* - sensor auto-reset is enabled
*/
if ((0u != context->ptrCommonConfig->swSensorAutoResetEn) ||
((uint32_t)ptrSnsContext->raw <= ((uint32_t)ptrWdContext->noiseTh + ptrSnsContext->bsln)))
{
/* Get real baseline */
bslnHistory = ((uint32_t)ptrSnsContext->bsln << CY_CAPSENSE_IIR_BL_SHIFT) | ptrSnsContext->bslnExt;
/* Calculate baseline value */
bslnHistory = Cy_CapSense_FtIIR1stOrder((uint32_t)ptrSnsContext->raw << CY_CAPSENSE_IIR_BL_SHIFT, bslnHistory, (uint32_t)ptrWdContext->bslnCoeff);
/* Split baseline */
ptrSnsContext->bsln = (uint16_t)(bslnHistory >> CY_CAPSENSE_IIR_BL_SHIFT);
ptrSnsContext->bslnExt = (uint8_t)(bslnHistory);
}
}
/* If BIST enabled, update the baseline inverse duplication */
#if ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_BIST_EN) &&\
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_BSLN_INTEGRITY_EN))
*ptrSnsBslnInv = ~ptrSnsContext->bsln;
#endif /* ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_BIST_EN) &&\
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_BSLN_INTEGRITY_EN)) */
}
return result;
}
/*******************************************************************************
* Function Name: Cy_CapSense_InitializeAllBaselines
****************************************************************************//**
*
* Initializes the baselines of all the sensors of all active widgets.
*
* This function initializes baselines for all sensors and widgets
* in the project skipping low power widgets since their baselines are
* managed on HW level.
* It can also be used to re-initialize baselines at any time, however, note
* that all sensor data history information and sensor status shall be reset
* along with re-initialization of baseline.
*
* Following functions to initialize sensor and widgets and filter history
* should be called after initializing baseline for proper operation of
* the CAPSENSE™ middleware:
* * Cy_CapSense_InitializeAllStatuses()
* * Cy_CapSense_InitializeAllFilters()
*
* These functions are called by the CapSense_Enable() function, hence it is
* not required to use this function if above function is used.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns the status of the operation:
* - CY_CAPSENSE_STATUS_SUCCESS - The operation is performed successfully.
* - CY_CAPSENSE_STATUS_BAD_PARAM - The input parameter is invalid.
*
*******************************************************************************/
cy_capsense_status_t Cy_CapSense_InitializeAllBaselines(cy_stc_capsense_context_t * context)
{
cy_capsense_status_t capStatus = CY_CAPSENSE_STATUS_SUCCESS;
uint32_t wdIndex;
for (wdIndex = CY_CAPSENSE_TOTAL_WIDGET_COUNT; wdIndex-- > 0u;)
{
capStatus = Cy_CapSense_InitializeWidgetBaseline(wdIndex, context);
}
return capStatus;
}
/*******************************************************************************
* Function Name: Cy_CapSense_InitializeWidgetBaseline
****************************************************************************//**
*
* Initializes the baselines of all the sensors in a specific widget.
*
* This function initializes baselines for all sensors in a specific widget
* in the project. It can also be used to re-initialize baselines at any time,
* however, note that all sensor data history information and sensor status
* should be reset along with re-initialization of baseline.
*
* The following functions to initialize sensor and widgets and filter history
* should be called after initializing baselines for proper operation of
* middleware.
* * Cy_CapSense_InitializeWidgetStatus()
* * Cy_CapSense_InitializeWidgetFilter()
*
* These functions are called by CapSense_Enable() function, hence it is not
* required to use this function is above function is used.
*
* \param widgetId
* Specifies the ID number of the widget. A macro for the widget ID can be found
* in the cycfg_capsense.h file defined as CY_CAPSENSE_<WIDGET_NAME>_WDGT_ID.
*
* \note For the fifth-generation low power CAPSENSE™ widgets
* of the \ref CY_CAPSENSE_WD_LOW_POWER_E type are not processed.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns the status of the operation:
* - CY_CAPSENSE_STATUS_SUCCESS - The operation is performed successfully.
* - CY_CAPSENSE_STATUS_BAD_PARAM - The input parameter is invalid.
*
*******************************************************************************/
cy_capsense_status_t Cy_CapSense_InitializeWidgetBaseline(
uint32_t widgetId,
cy_stc_capsense_context_t * context)
{
cy_capsense_status_t capStatus = CY_CAPSENSE_STATUS_SUCCESS;
uint32_t snsIndex;
#if (CY_CAPSENSE_PLATFORM_BLOCK_FIFTH_GEN_LP)
if (((uint8_t)CY_CAPSENSE_WD_LOW_POWER_E != context->ptrWdConfig[widgetId].wdType) &&
((uint8_t)CY_CAPSENSE_WD_LIQUID_LEVEL_E != context->ptrWdConfig[widgetId].wdType))
#endif /* CY_CAPSENSE_PLATFORM_BLOCK_FIFTH_GEN_LP */
{
for (snsIndex = context->ptrWdConfig[widgetId].numSns; snsIndex-- > 0u;)
{
capStatus = Cy_CapSense_InitializeSensorBaseline(widgetId, snsIndex, context);
}
}
return capStatus;
}
/*******************************************************************************
* Function Name: Cy_CapSense_InitializeSensorBaseline
****************************************************************************//**
*
* Initializes the baseline of a sensor in a widget specified
* by the input parameters.
*
* \param widgetId
* Specifies the ID number of the widget. A macro for the widget ID can be found
* in the cycfg_capsense.h file defined as CY_CAPSENSE_<WIDGET_NAME>_WDGT_ID.
*
* \note For the fifth-generation low power CAPSENSE™ it is forbidden
* to call this function for widgets of the \ref CY_CAPSENSE_WD_LOW_POWER_E type
* since behavior is unpredictable.
*
* \param sensorId
* Specifies the ID number of the sensor within the widget. A macro for the
* sensor ID within a specified widget can be found in the cycfg_capsense.h
* file defined as CY_CAPSENSE_<WIDGET_NAME>_SNS<SENSOR_NUMBER>_ID.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns the status of the operation:
* - CY_CAPSENSE_STATUS_SUCCESS - The operation is performed successfully.
* - CY_CAPSENSE_STATUS_BAD_PARAM - The input parameter is invalid.
*
*******************************************************************************/
cy_capsense_status_t Cy_CapSense_InitializeSensorBaseline(
uint32_t widgetId,
uint32_t sensorId,
cy_stc_capsense_context_t * context)
{
cy_capsense_status_t capStatus = CY_CAPSENSE_STATUS_SUCCESS;
uint32_t cxtOffset;
uint32_t freqChIndex;
const cy_stc_capsense_widget_config_t * ptrWdCfg = &context->ptrWdConfig[widgetId];
#if (CY_CAPSENSE_PSOC4_FIFTH_GEN_LP)
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_LP_EN)
if ((uint8_t)CY_CAPSENSE_WD_LOW_POWER_E == ptrWdCfg->wdType)
{
capStatus = CY_CAPSENSE_STATUS_BAD_PARAM;
}
#endif
#endif
if (CY_CAPSENSE_STATUS_SUCCESS == capStatus)
{
for (freqChIndex = 0u; freqChIndex < CY_CAPSENSE_CONFIGURED_FREQ_NUM; freqChIndex++)
{
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_MULTI_FREQUENCY_SCAN_EN)
cxtOffset = sensorId + (freqChIndex * context->ptrCommonConfig->numSns);
#else
cxtOffset = sensorId;
#endif
Cy_CapSense_FtInitializeBaseline(&ptrWdCfg->ptrSnsContext[cxtOffset]);
/* If BIST enabled, create a baseline inverse duplication */
#if ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_BIST_EN) &&\
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_BSLN_INTEGRITY_EN))
ptrWdCfg->ptrBslnInv[cxtOffset] = ~ptrWdCfg->ptrSnsContext[cxtOffset].bsln;
#endif /* ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_BIST_EN) &&\
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_BSLN_INTEGRITY_EN)) */
}
}
return capStatus;
}
/*******************************************************************************
* Function Name: Cy_CapSense_FtInitializeBaseline
****************************************************************************//**
*
* Initializes the baseline history for a sensor indicated by an input
* parameter.
*
* \param ptrSnsContext
* The pointer to the sensor context structure.
*
*******************************************************************************/
void Cy_CapSense_FtInitializeBaseline(cy_stc_capsense_sensor_context_t * ptrSnsContext)
{
ptrSnsContext->bslnExt = 0u;
ptrSnsContext->bsln = ptrSnsContext->raw;
ptrSnsContext->negBslnRstCnt = 0u;
}
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_RAWCOUNT_FILTER_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_InitializeAllFilters
****************************************************************************//**
*
* Initializes (or re-initializes) all the firmware filter history, except
* the baseline.
*
* Calling this function is accompanied by
* * Cy_CapSense_InitializeAllStatuses()
* * Cy_CapSense_InitializeAllBaselines()
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_InitializeAllFilters(const cy_stc_capsense_context_t * context)
{
uint32_t widgetId;
for (widgetId = CY_CAPSENSE_TOTAL_WIDGET_COUNT; widgetId-- > 0u;)
{
Cy_CapSense_InitializeWidgetFilter(widgetId, context);
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_InitializeWidgetFilter
****************************************************************************//**
*
* Initializes (or re-initializes) the raw count filter history of all
* the sensors in a widget specified by the input parameter.
*
* Calling this function is accompanied by
* - Cy_CapSense_InitializeWidgetStatus().
* - Cy_CapSense_InitializeWidgetBaseline().
*
* \param widgetId
* Specifies the ID number of the widget. A macro for the widget ID can be found
* in the cycfg_capsense.h file defined as CY_CAPSENSE_<WIDGET_NAME>_WDGT_ID.
*
* \note For the fifth-generation low power CAPSENSE™ widgets
* of the \ref CY_CAPSENSE_WD_LOW_POWER_E type are not processed since their
* filters are managed by HW.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_InitializeWidgetFilter(
uint32_t widgetId,
const cy_stc_capsense_context_t * context)
{
uint32_t snsIndex;
uint32_t freqChIndex;
uint32_t snsHistorySize;
uint32_t historyOffset;
const cy_stc_capsense_widget_config_t * ptrWdCfg = &context->ptrWdConfig[widgetId];
uint32_t rawFilterCfg = ptrWdCfg->rawFilterConfig;
uint16_t * ptrHistory;
const cy_stc_capsense_sensor_context_t * ptrSnsCtx ;
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_SMARTSENSE_ACTIVE_FULL_EN)
cy_stc_capsense_smartsense_csd_noise_envelope_t * ptrNEHistory;
#endif
#if (CY_CAPSENSE_REGULAR_RC_IIR_FILTER_EN || CY_CAPSENSE_PROX_RC_IIR_FILTER_EN)
uint8_t * ptrHistoryLow = NULL;
#endif
#if (CY_CAPSENSE_PLATFORM_BLOCK_FIFTH_GEN_LP)
if ((uint8_t)CY_CAPSENSE_WD_LOW_POWER_E != ptrWdCfg->wdType)
#endif /* CY_CAPSENSE_PLATFORM_BLOCK_FIFTH_GEN_LP */
{
snsHistorySize = (uint32_t)ptrWdCfg->rawFilterConfig & CY_CAPSENSE_RC_FILTER_SNS_HISTORY_SIZE_MASK;
for (freqChIndex = 0u; freqChIndex < CY_CAPSENSE_CONFIGURED_FREQ_NUM; freqChIndex++)
{
for (snsIndex = 0u; snsIndex < ptrWdCfg->numSns; snsIndex++)
{
ptrSnsCtx = &ptrWdCfg->ptrSnsContext[snsIndex + (freqChIndex * context->ptrCommonConfig->numSns)];
historyOffset = (freqChIndex * (CY_CAPSENSE_RAW_HISTORY_SIZE / CY_CAPSENSE_CONFIGURED_FREQ_NUM)) + (snsHistorySize * snsIndex);
ptrHistory = &ptrWdCfg->ptrRawFilterHistory[historyOffset];
#if (CY_CAPSENSE_REGULAR_RC_MEDIAN_FILTER_EN || CY_CAPSENSE_PROX_RC_MEDIAN_FILTER_EN)
if (0u != (CY_CAPSENSE_RC_FILTER_MEDIAN_EN_MASK & rawFilterCfg))
{
Cy_CapSense_InitializeMedianInternal(ptrWdCfg, ptrSnsCtx, ptrHistory);
ptrHistory += CY_CAPSENSE_RC_MEDIAN_SIZE;
}
#endif
#if (CY_CAPSENSE_REGULAR_RC_IIR_FILTER_EN || CY_CAPSENSE_PROX_RC_IIR_FILTER_EN)
if (0u != (CY_CAPSENSE_RC_FILTER_IIR_EN_MASK & rawFilterCfg))
{
if (CY_CAPSENSE_IIR_FILTER_PERFORMANCE == (ptrWdCfg->rawFilterConfig & CY_CAPSENSE_RC_FILTER_IIR_MODE_MASK))
{
ptrHistoryLow = &ptrWdCfg->ptrRawFilterHistoryLow[snsIndex +
(freqChIndex * (CY_CAPSENSE_IIR_HISTORY_LOW_SIZE / CY_CAPSENSE_CONFIGURED_FREQ_NUM))];
}
Cy_CapSense_InitializeIIRInternal(ptrWdCfg, ptrSnsCtx, ptrHistory, ptrHistoryLow);
}
#endif
#if (CY_CAPSENSE_REGULAR_RC_AVERAGE_FILTER_EN || CY_CAPSENSE_PROX_RC_AVERAGE_FILTER_EN)
if (0u != (CY_CAPSENSE_RC_FILTER_AVERAGE_EN_MASK & rawFilterCfg))
{
ptrHistory += CY_CAPSENSE_RC_IIR_SIZE;
Cy_CapSense_InitializeAverageInternal(ptrWdCfg, ptrSnsCtx, ptrHistory);
}
#endif
}
}
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_SMARTSENSE_ACTIVE_FULL_EN)
if ((((uint8_t)CY_CAPSENSE_WD_LOW_POWER_E != ptrWdCfg->wdType) && ((uint8_t)CY_CAPSENSE_WD_LIQUID_LEVEL_E != ptrWdCfg->wdType)) &&
(((CY_CAPSENSE_CSD_GROUP == ptrWdCfg->senseMethod) && (CY_CAPSENSE_ENABLE == CY_CAPSENSE_SMARTSENSE_CSD_ACTIVE_FULL_EN)) ||
((CY_CAPSENSE_ISX_GROUP == ptrWdCfg->senseMethod) && (CY_CAPSENSE_ENABLE == CY_CAPSENSE_SMARTSENSE_ISX_ACTIVE_FULL_EN))))
{
ptrSnsCtx = ptrWdCfg->ptrSnsContext;
ptrNEHistory = ptrWdCfg->ptrNoiseEnvelope;
for (snsIndex = 0u; snsIndex < ptrWdCfg->numSns; snsIndex++)
{
Cy_CapSense_InitializeNoiseEnvelope_Lib(ptrSnsCtx->raw,
ptrWdCfg->ptrWdContext->sigPFC, ptrNEHistory);
ptrSnsCtx++;
ptrNEHistory++;
}
}
#endif
}
}
#endif /*(CY_CAPSENSE_DISABLE != CY_CAPSENSE_RAWCOUNT_FILTER_EN)*/
#if (CY_CAPSENSE_REGULAR_RC_IIR_FILTER_EN || CY_CAPSENSE_PROX_RC_IIR_FILTER_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_InitializeIIRInternal
****************************************************************************//**
*
* Initializes the IIR filter history.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
* \param ptrSnsContext
* The pointer to the sensor context structure.
*
* \param ptrSnsRawHistory
* The pointer to the filter history of the sensor.
*
* \param ptrSnsRawHistoryLow
* The pointer to the extended filter history of the sensor.
*
*******************************************************************************/
void Cy_CapSense_InitializeIIRInternal(
const cy_stc_capsense_widget_config_t * ptrWdConfig,
const cy_stc_capsense_sensor_context_t * ptrSnsContext,
uint16_t * ptrSnsRawHistory,
uint8_t * ptrSnsRawHistoryLow)
{
ptrSnsRawHistory[0u] = ptrSnsContext->raw;
if ((NULL != ptrSnsRawHistoryLow) &&
(CY_CAPSENSE_IIR_FILTER_PERFORMANCE == (ptrWdConfig->rawFilterConfig & CY_CAPSENSE_RC_FILTER_IIR_MODE_MASK)))
{
ptrSnsRawHistoryLow[0u] = 0u;
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_RunIIRInternal
****************************************************************************//**
*
* Runs the IIR filter.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
* \param ptrSnsContext
* The pointer to the sensor context structure.
*
* \param ptrSnsRawHistory
* The pointer to the filter history of the sensor.
*
* \param ptrSnsRawHistoryLow
* The pointer to the extended filter history of the sensor.
*
*******************************************************************************/
void Cy_CapSense_RunIIRInternal(
const cy_stc_capsense_widget_config_t * ptrWdConfig,
cy_stc_capsense_sensor_context_t * ptrSnsContext,
uint16_t * ptrSnsRawHistory,
uint8_t * ptrSnsRawHistoryLow)
{
uint32_t tempHistory;
uint32_t tempRaw;
if (CY_CAPSENSE_IIR_FILTER_PERFORMANCE == (ptrWdConfig->rawFilterConfig & CY_CAPSENSE_RC_FILTER_IIR_MODE_MASK))
{
tempRaw = ((uint32_t)ptrSnsContext->raw) << CY_CAPSENSE_IIR_SHIFT_PERFORMANCE;
tempHistory = ((uint32_t)(*ptrSnsRawHistory)) << CY_CAPSENSE_IIR_SHIFT_PERFORMANCE;
tempHistory |= (uint32_t)(*ptrSnsRawHistoryLow);
tempRaw = Cy_CapSense_FtIIR1stOrder(tempRaw, tempHistory, ptrWdConfig->iirCoeff);
*ptrSnsRawHistory = (uint16_t)(tempRaw >> CY_CAPSENSE_IIR_SHIFT_PERFORMANCE);
*ptrSnsRawHistoryLow = (uint8_t)(tempRaw);
ptrSnsContext->raw = (uint16_t)(tempRaw >> CY_CAPSENSE_IIR_SHIFT_PERFORMANCE);
}
else
{
tempRaw = Cy_CapSense_FtIIR1stOrder((uint32_t)ptrSnsContext->raw, (uint32_t)(*ptrSnsRawHistory), ptrWdConfig->iirCoeff);
*ptrSnsRawHistory = (uint16_t)(tempRaw);
ptrSnsContext->raw = *ptrSnsRawHistory;
}
}
#endif /* (CY_CAPSENSE_REGULAR_RC_IIR_FILTER_EN || CY_CAPSENSE_PROX_RC_IIR_FILTER_EN) */
#if (CY_CAPSENSE_REGULAR_RC_MEDIAN_FILTER_EN || CY_CAPSENSE_PROX_RC_MEDIAN_FILTER_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_InitializeMedianInternal
****************************************************************************//**
*
* Initializes the median filter.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
* \param ptrSnsContext
* The pointer to the sensor context structure.
*
* \param ptrSnsRawHistory
* The pointer to the filter history of the sensor.
*
*******************************************************************************/
void Cy_CapSense_InitializeMedianInternal(
const cy_stc_capsense_widget_config_t * ptrWdConfig,
const cy_stc_capsense_sensor_context_t * ptrSnsContext,
uint16_t * ptrSnsRawHistory)
{
(void)ptrWdConfig;
ptrSnsRawHistory[0u] = ptrSnsContext->raw;
ptrSnsRawHistory[1u] = ptrSnsContext->raw;
}
/*******************************************************************************
* Function Name: Cy_CapSense_RunMedianInternal
****************************************************************************//**
*
* Runs the median filter.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
* \param ptrSnsContext
* The pointer to the sensor context structure.
*
* \param ptrSnsRawHistory
* The pointer to the filter history of the sensor.
*
*******************************************************************************/
void Cy_CapSense_RunMedianInternal(
const cy_stc_capsense_widget_config_t * ptrWdConfig,
cy_stc_capsense_sensor_context_t * ptrSnsContext,
uint16_t * ptrSnsRawHistory)
{
uint32_t temp = Cy_CapSense_FtMedian(
(uint32_t)ptrSnsContext->raw,
(uint32_t)ptrSnsRawHistory[0u],
(uint32_t)ptrSnsRawHistory[1u]);
(void)ptrWdConfig;
ptrSnsRawHistory[1u] = ptrSnsRawHistory[0u];
ptrSnsRawHistory[0u] = ptrSnsContext->raw;
ptrSnsContext->raw = (uint16_t)(temp);
}
#endif /* (CY_CAPSENSE_REGULAR_RC_MEDIAN_FILTER_EN || CY_CAPSENSE_PROX_RC_MEDIAN_FILTER_EN) */
#if (CY_CAPSENSE_REGULAR_RC_AVERAGE_FILTER_EN || CY_CAPSENSE_PROX_RC_AVERAGE_FILTER_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_InitializeAverageInternal
****************************************************************************//**
*
* Initializes the average filter.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
* \param ptrSnsContext
* The pointer to the sensor context structure.
*
* \param ptrSnsRawHistory
* The pointer to the filter history of the sensor.
*
*******************************************************************************/
void Cy_CapSense_InitializeAverageInternal(
const cy_stc_capsense_widget_config_t * ptrWdConfig,
const cy_stc_capsense_sensor_context_t * ptrSnsContext,
uint16_t * ptrSnsRawHistory)
{
(void)ptrWdConfig;
ptrSnsRawHistory[0u] = ptrSnsContext->raw;
ptrSnsRawHistory[1u] = ptrSnsContext->raw;
ptrSnsRawHistory[2u] = ptrSnsContext->raw;
}
/*******************************************************************************
* Function Name: Cy_CapSense_RunAverageInternal
****************************************************************************//**
*
* Runs the average filter.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
* \param ptrSnsContext
* The pointer to the sensor context structure.
*
* \param ptrSnsRawHistory
* The pointer to the filter history of the sensor.
*
*******************************************************************************/
void Cy_CapSense_RunAverageInternal(
const cy_stc_capsense_widget_config_t * ptrWdConfig,
cy_stc_capsense_sensor_context_t * ptrSnsContext,
uint16_t * ptrSnsRawHistory)
{
uint32_t temp;
if (CY_CAPSENSE_AVERAGE_FILTER_LEN_4 == (ptrWdConfig->rawFilterConfig & CY_CAPSENSE_RC_FILTER_AVERAGE_MODE_MASK))
{
temp = ((uint32_t)ptrSnsContext->raw + ptrSnsRawHistory[0u] + ptrSnsRawHistory[1u] + ptrSnsRawHistory[2u]) >> 2u;
ptrSnsRawHistory[2u] = ptrSnsRawHistory[1u];
ptrSnsRawHistory[1u] = ptrSnsRawHistory[0u];
}
else
{
temp = ((uint32_t)ptrSnsContext->raw + ptrSnsRawHistory[0u]) >> 1u;
}
ptrSnsRawHistory[0u] = ptrSnsContext->raw;
ptrSnsContext->raw = (uint16_t)(temp);
}
#endif /* (CY_CAPSENSE_REGULAR_RC_AVERAGE_FILTER_EN || CY_CAPSENSE_PROX_RC_AVERAGE_FILTER_EN) */
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_RAWCOUNT_FILTER_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_FtRunEnabledFiltersInternal
****************************************************************************//**
*
* Runs all enabled filters.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
* \param ptrSnsContext
* The pointer to the sensor context structure.
*
* \param ptrSnsRawHistory
* The pointer to the filter history of the sensor.
*
* \param ptrSnsRawHistoryLow
* The pointer to the extended filter history of the sensor.
*
*******************************************************************************/
void Cy_CapSense_FtRunEnabledFiltersInternal(
const cy_stc_capsense_widget_config_t * ptrWdConfig,
cy_stc_capsense_sensor_context_t * ptrSnsContext,
uint16_t * ptrSnsRawHistory,
uint8_t * ptrSnsRawHistoryLow)
{
uint16_t rawFilterCfg;
rawFilterCfg = ptrWdConfig->rawFilterConfig;
uint16_t * ptrSnsRawHistoryLocal = ptrSnsRawHistory;
#if (CY_CAPSENSE_REGULAR_RC_MEDIAN_FILTER_EN || CY_CAPSENSE_PROX_RC_MEDIAN_FILTER_EN)
if (0u != (CY_CAPSENSE_RC_FILTER_MEDIAN_EN_MASK & rawFilterCfg))
{
Cy_CapSense_RunMedianInternal(ptrWdConfig, ptrSnsContext, ptrSnsRawHistoryLocal);
ptrSnsRawHistoryLocal += CY_CAPSENSE_RC_MEDIAN_SIZE;
}
#endif
#if (CY_CAPSENSE_REGULAR_RC_IIR_FILTER_EN || CY_CAPSENSE_PROX_RC_IIR_FILTER_EN)
if (0u != (CY_CAPSENSE_RC_FILTER_IIR_EN_MASK & rawFilterCfg))
{
Cy_CapSense_RunIIRInternal(ptrWdConfig, ptrSnsContext, ptrSnsRawHistoryLocal, ptrSnsRawHistoryLow);
ptrSnsRawHistoryLocal += CY_CAPSENSE_RC_IIR_SIZE;
}
#else
(void)ptrSnsRawHistoryLow;
#endif
#if (CY_CAPSENSE_REGULAR_RC_AVERAGE_FILTER_EN || CY_CAPSENSE_PROX_RC_AVERAGE_FILTER_EN)
if (0u != (CY_CAPSENSE_RC_FILTER_AVERAGE_EN_MASK & rawFilterCfg))
{
Cy_CapSense_RunAverageInternal(ptrWdConfig, ptrSnsContext, ptrSnsRawHistoryLocal);
}
#endif
}
#endif /* (CY_CAPSENSE_DISABLE != CY_CAPSENSE_RAWCOUNT_FILTER_EN) */
#if (CY_CAPSENSE_POS_MEDIAN_FILTER_EN || CY_CAPSENSE_REGULAR_RC_MEDIAN_FILTER_EN \
|| CY_CAPSENSE_PROX_RC_MEDIAN_FILTER_EN || CY_CAPSENSE_MULTI_FREQUENCY_SCAN_EN || CY_CAPSENSE_MULTI_FREQUENCY_WIDGET_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_FtMedian
****************************************************************************//**
*
* Returns the median value from the three passed arguments.
*
* \param x1
* The first value to be compared.
*
* \param x2
* The second value to be compared.
*
* \param x3
* The third value to be compared.
*
* \return
* Returns the median value of input arguments.
*
*******************************************************************************/