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cy_capsense_centroid.c
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/***************************************************************************//**
* \file cy_capsense_centroid.c
* \version 6.10.0
*
* \brief
* This file provides the source code for the centroid calculation methods
* of the CAPSENSE™ middleware.
*
********************************************************************************
* \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 <string.h>
#include <stddef.h>
#include <stdint.h>
#include "cy_syslib.h"
#include "cy_capsense_centroid.h"
#include "cy_capsense_common.h"
#include "cy_capsense_lib.h"
#include "cy_capsense_structure.h"
#include "cy_capsense_filter.h"
#include "cycfg_capsense_defines.h"
#if (defined(CY_IP_MXCSDV2) || defined(CY_IP_M0S8CSDV2) || defined(CY_IP_M0S8MSCV3) || defined(CY_IP_M0S8MSCV3LP))
#if ((CY_CAPSENSE_DISABLE != CY_CAPSENSE_SLIDER_EN) || (CY_CAPSENSE_DISABLE != CY_CAPSENSE_TOUCHPAD_EN) || (CY_CAPSENSE_DISABLE != CY_CAPSENSE_LIQUID_LEVEL_EN))
/*******************************************************************************
* Local definition
*******************************************************************************/
#define CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_LENGTH (3u)
#define CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_PREVIOUS (0u)
#define CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_CENTER (1u)
#define CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_NEXT (2u)
#define CY_CAPSENSE_LINEAR_SLIDER_MIN_SNS_COUNT (3u)
#define CY_CAPSENSE_TOUCHPAD_MIN_COL_SNS_COUNT (3u)
#define CY_CAPSENSE_TOUCHPAD_MIN_ROW_SNS_COUNT (3u)
/* Minimum valid age */
#define CY_CAPSENSE_CSX_TOUCHPAD_AGE_START (0x0100u)
#define CY_CAPSENSE_CSX_TOUCHPAD_Z_SHIFT (0x04u)
#define CY_CAPSENSE_CSX_TOUCHPAD_BYTE_SHIFT (8u)
#define CY_CAPSENSE_CENTROID_ROUND_VALUE (0x7Fu)
#define CY_CAPSENSE_NO_LOCAL_MAX (0xFFFFu)
/*******************************************************************************
* Function Prototypes
*******************************************************************************/
/******************************************************************************/
/** \cond SECTION_CAPSENSE_INTERNAL */
/** \addtogroup group_capsense_internal *//** \{ */
/******************************************************************************/
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
static void Cy_CapSense_TransferTouch(
uint32_t newIndex,
uint32_t oldIndex,
const cy_stc_capsense_widget_config_t * ptrWdConfig);
#endif
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
static void Cy_CapSense_NewTouch(
uint32_t newIndex,
const cy_stc_capsense_widget_config_t * ptrWdConfig);
#endif
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
static uint32_t Cy_CapSense_CalcDistance(
uint32_t newIndex,
uint32_t oldIndex,
const cy_stc_capsense_widget_config_t * ptrWdConfig);
#endif
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
static void Cy_CapSense_Hungarian(
const cy_stc_capsense_widget_config_t * ptrWdConfig);
#endif
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
static void Cy_CapSense_CopyTouchRecord(
cy_stc_capsense_position_t * destination,
const cy_stc_capsense_position_t * source);
#endif
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
__STATIC_INLINE void Cy_CapSense_TouchDownDebounce(
const cy_stc_capsense_widget_config_t * ptrWdConfig);
#endif
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
__STATIC_INLINE void Cy_CapSense_SortByAge(
const cy_stc_capsense_widget_config_t * ptrWdConfig);
#endif
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
__STATIC_INLINE uint8_t Cy_CapSense_GetLowestId(uint8_t idMask);
#endif
/** \} \endcond */
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_DIPLEX_SLIDER_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_DpCentroidDiplex
****************************************************************************//**
*
* Finds touch position of a Linear slider widget with enabled diplexing.
*
* In scope of position searching this function finds the local maximum with the
* highest raw count. If such maximums are more than one, then the maximum with the
* bigger sum of neighboring sensors is taken for further processing. Then the position
* is calculated using centroid algorithm with three sensors.
*
* At least two neighboring sensors should cross finger threshold. Then the algorithm
* is able to distinguish where real touch is located (direct part of slider or
* diplex part of slider) and corresponding position is reported. Otherwise no
* touch is reported.
*
* This function does not detect two or more touches.
*
* \param newTouch
* The pointer to the touch structure where found position is stored.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
*******************************************************************************/
void Cy_CapSense_DpCentroidDiplex(
cy_stc_capsense_touch_t * newTouch,
const cy_stc_capsense_widget_config_t * ptrWdConfig)
{
uint32_t sum;
uint32_t diffM;
uint32_t diffP;
uint32_t snsIndex;
const cy_stc_capsense_sensor_context_t * ptrSnsCxt;
const uint8_t * ptrDpxTable;
uint32_t snsCount = ptrWdConfig->numSns;
uint32_t maxSum = 0u;
uint32_t maxDiff = 0u;
uint32_t maxIndex = CY_CAPSENSE_NO_LOCAL_MAX;
uint32_t threshold = ptrWdConfig->ptrWdContext->fingerTh;
int32_t numerator = 0;
int32_t denominator = 0;
uint32_t multiplier;
uint32_t offset;
threshold -= ptrWdConfig->ptrWdContext->hysteresis;
ptrDpxTable = ptrWdConfig->ptrDiplexTable;
/* Find maximum signal */
ptrSnsCxt = ptrWdConfig->ptrSnsContext;
for (snsIndex = 0u; snsIndex < snsCount; snsIndex++)
{
if (maxDiff < ptrSnsCxt->diff)
{
maxDiff = ptrSnsCxt->diff;
}
ptrSnsCxt++;
}
/* Find sensor index with maximum sum ([i-1],[i],[i+1]) including diplex part */
ptrSnsCxt = ptrWdConfig->ptrSnsContext;
for (snsIndex = 0u; snsIndex < (snsCount << 1u); snsIndex++)
{
/* Potential maximum */
if (maxDiff == ptrSnsCxt[ptrDpxTable[snsIndex]].diff)
{
/* Get sum of differences around maximum */
diffM = (snsIndex > 0u) ? ptrSnsCxt[ptrDpxTable[snsIndex - 1u]].diff : 0u;
diffP = (snsIndex < ((snsCount << 1u) - 1u)) ? ptrSnsCxt[ptrDpxTable[snsIndex + 1u]].diff : 0u;
sum = ptrSnsCxt[ptrDpxTable[snsIndex]].diff + diffM + diffP;
if ((diffM < threshold) && (diffP < threshold))
{
sum = 0u;
}
if (maxSum < sum)
{
/* New maximum */
maxIndex = snsIndex;
maxSum = sum;
numerator = (int32_t)diffP - (int32_t)diffM;
}
}
}
if ((maxIndex != CY_CAPSENSE_NO_LOCAL_MAX) && (maxSum > 0u))
{
multiplier = (uint32_t)ptrWdConfig->xResolution << 8u;
/* Calculate position */
if (0u == (ptrWdConfig->centroidConfig & CY_CAPSENSE_CALC_METHOD_MASK))
{
multiplier /= ((snsCount << 1u) - 1u);
offset = 0u;
}
else
{
multiplier /= (snsCount << 1u);
offset = multiplier >> 1u;
}
denominator = (int32_t)maxSum;
denominator = ((numerator * (int32_t)multiplier) / denominator) + (((int32_t)maxIndex * (int32_t)multiplier) + (int32_t)offset);
/* Round result and shift 8 bits left */
newTouch->numPosition = CY_CAPSENSE_POSITION_ONE;
newTouch->ptrPosition[0u].x = (uint16_t)(((uint32_t)denominator + CY_CAPSENSE_CENTROID_ROUND_VALUE) >> 8u);
}
else
{
newTouch->numPosition = CY_CAPSENSE_POSITION_NONE;
}
}
#endif /* (CY_CAPSENSE_DISABLE != CY_CAPSENSE_DIPLEX_SLIDER_EN) */
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_LINEAR_SLIDER_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_DpCentroidLinear
****************************************************************************//**
*
* Finds touch position of a Linear slider widget.
*
* In scope of position searching this function finds the local maximum with the
* highest raw count. If such maximums are more than one, then the maximum with
* bigger sum of neighboring sensors is taken for further processing. Then the position
* is calculated using centroid algorithm with three sensors.
*
* This function does not detect two or more touches.
*
* \param newTouch
* The pointer to the touch structure where the found position is stored.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
*******************************************************************************/
void Cy_CapSense_DpCentroidLinear(
cy_stc_capsense_touch_t * newTouch,
const cy_stc_capsense_widget_config_t * ptrWdConfig)
{
uint32_t snsIndex = 0u;
uint32_t snsCount = ptrWdConfig->numSns;
uint32_t diffM;
uint32_t diffP;
uint32_t sum = 0u;
uint32_t maxSum = 0u;
uint32_t maxDiff = 0u;
uint32_t maxIndex = CY_CAPSENSE_NO_LOCAL_MAX;
const cy_stc_capsense_sensor_context_t * ptrSnsCxt;
int32_t numerator = 0;
int32_t denominator = 0;
uint32_t multiplier;
uint32_t offset;
if (snsCount < CY_CAPSENSE_LINEAR_SLIDER_MIN_SNS_COUNT)
{
snsCount = CY_CAPSENSE_LINEAR_SLIDER_MIN_SNS_COUNT;
}
if (1u == (ptrWdConfig->centroidConfig & CY_CAPSENSE_CENTROID_NUMBER_MASK))
{
/* Find maximum signal */
ptrSnsCxt = ptrWdConfig->ptrSnsContext;
for (snsIndex = 0u; snsIndex < snsCount; snsIndex++)
{
if (ptrSnsCxt->diff > maxDiff)
{
maxDiff = ptrSnsCxt->diff;
}
ptrSnsCxt++;
}
/* Find index of sensor with maximum signal */
ptrSnsCxt = ptrWdConfig->ptrSnsContext;
for (snsIndex = 0u; snsIndex < snsCount; snsIndex++)
{
/* Potential maximum */
if (maxDiff == ptrSnsCxt->diff)
{
/* Get sum of differences around maximum */
diffM = (snsIndex > 0u) ? (ptrSnsCxt - 1u)->diff : 0u;
diffP = (snsIndex < (snsCount - 1u)) ? (ptrSnsCxt + 1u)->diff : 0u;
sum = ptrSnsCxt->diff + diffM + diffP;
if (maxSum < sum)
{
/* New maximum */
maxIndex = snsIndex;
maxSum = sum;
numerator = (int32_t)diffP - (int32_t)diffM;
}
}
ptrSnsCxt++;
}
if ((maxIndex != CY_CAPSENSE_NO_LOCAL_MAX) && (maxSum > 0u))
{
/* Calculate position */
multiplier = (uint32_t)ptrWdConfig->xResolution << 8u;
if (0u == (ptrWdConfig->centroidConfig & CY_CAPSENSE_CALC_METHOD_MASK))
{
multiplier /= (snsCount - 1u);
offset = 0u;
}
else
{
multiplier /= snsCount;
offset = multiplier >> 1u;
}
denominator = (int32_t)maxSum;
denominator = ((numerator * (int32_t)multiplier) / denominator) + (((int32_t)maxIndex * (int32_t)multiplier) + (int32_t)offset);
/* Round result and shift 8 bits left */
newTouch->numPosition = CY_CAPSENSE_POSITION_ONE;
newTouch->ptrPosition[0u].x = (uint16_t)(((uint32_t)denominator + CY_CAPSENSE_CENTROID_ROUND_VALUE) >> 8u);
}
else
{
newTouch->numPosition = CY_CAPSENSE_POSITION_NONE;
}
}
else
{
/* This is a place holder for local maximum searching when number of centroids could be more than one */
}
}
#endif /* (CY_CAPSENSE_DISABLE != CY_CAPSENSE_LINEAR_SLIDER_EN) */
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSD_RADIAL_SLIDER_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_DpCentroidRadial
****************************************************************************//**
*
* Finds touch position of a Radial slider widget.
*
* In scope of position searching this function finds the local maximum with the
* highest raw count. If such maximums are more than one, then the maximum with
* bigger sum of neighboring sensors is taken for further processing. Then the position
* is calculated using centroid algorithm with three sensors.
*
* This function does not detect two or more touches.
*
* \param newTouch
* The pointer to the touch structure where found position is stored.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
*******************************************************************************/
void Cy_CapSense_DpCentroidRadial(
cy_stc_capsense_touch_t * newTouch,
const cy_stc_capsense_widget_config_t * ptrWdConfig)
{
uint32_t snsIndex = 0u;
uint32_t snsCount = ptrWdConfig->numSns;
uint32_t diffM;
uint32_t diffP;
uint32_t sum = 0u;
uint32_t maxSum = 0u;
uint32_t maxDiff = 0u;
uint32_t maxIndex = CY_CAPSENSE_NO_LOCAL_MAX;
const cy_stc_capsense_sensor_context_t * ptrSnsCxt;
int32_t numerator = 0;
int32_t denominator = 0;
uint32_t multiplier;
if (1u == (ptrWdConfig->centroidConfig & CY_CAPSENSE_CENTROID_NUMBER_MASK))
{
/* Find maximum signal */
ptrSnsCxt = ptrWdConfig->ptrSnsContext;
for (snsIndex = 0u; snsIndex < snsCount; snsIndex++)
{
if (ptrSnsCxt->diff > maxDiff)
{
maxDiff = ptrSnsCxt->diff;
}
ptrSnsCxt++;
}
/* Find index of sensor with maximum signal */
ptrSnsCxt = ptrWdConfig->ptrSnsContext;
for (snsIndex = 0u; snsIndex < snsCount; snsIndex++)
{
/* Potential maximum */
if (maxDiff == ptrSnsCxt->diff)
{
/* Get sum of differences around maximum */
diffM = (snsIndex > 0u) ? (ptrSnsCxt - 1u)->diff : ptrWdConfig->ptrSnsContext[snsCount - 1u].diff;
diffP = (snsIndex < (snsCount - 1u)) ? (ptrSnsCxt + 1u)->diff : ptrWdConfig->ptrSnsContext[0u].diff;
sum = ptrSnsCxt->diff + diffM + diffP;
if (maxSum < sum)
{
/* New maximum */
maxIndex = snsIndex;
maxSum = sum;
numerator = (int32_t)diffP - (int32_t)diffM;
}
}
ptrSnsCxt++;
}
if ((maxIndex != CY_CAPSENSE_NO_LOCAL_MAX) && (maxSum > 0u))
{
/* Calculate position */
multiplier = ((uint32_t)ptrWdConfig->xResolution << 8u) / snsCount;
denominator = (int32_t)maxSum;
denominator = ((numerator * (int32_t)multiplier) / denominator) + ((int32_t)maxIndex * (int32_t)multiplier);
if (denominator < 0)
{
denominator += ((int32_t)snsCount * (int32_t)multiplier);
}
/* Round result and shift 8 bits left */
newTouch->numPosition = CY_CAPSENSE_POSITION_ONE;
newTouch->ptrPosition[0u].x = (uint16_t)(((uint32_t)denominator + CY_CAPSENSE_CENTROID_ROUND_VALUE) >> 8u);
}
else
{
newTouch->numPosition = CY_CAPSENSE_POSITION_NONE;
}
}
else
{
/* This is a place holder for local maximum searching when number of centroids could be more than one */
}
}
#endif /* (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSD_RADIAL_SLIDER_EN) */
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSD_TOUCHPAD_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_DpCentroidTouchpad
****************************************************************************//**
*
* Finds touch position of a CSD Touchpad widget.
*
* In scope of position searching this function finds the local maximum with the
* highest raw count. If such maximums are more than one, then the maximum with
* bigger sum of neighboring sensors is taken for further processing. Then the position
* is calculated using centroid algorithm with three sensors.
*
* This function does not detect two or more touches.
*
* \param newTouch
* The pointer to the touch structure where found position is stored.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
*******************************************************************************/
void Cy_CapSense_DpCentroidTouchpad(
cy_stc_capsense_touch_t * newTouch,
const cy_stc_capsense_widget_config_t * ptrWdConfig)
{
uint32_t snsIndex = 0u;
uint32_t snsCount = ptrWdConfig->numSns;
uint32_t colCount = ptrWdConfig->numCols;
uint32_t rowCount = ptrWdConfig->numRows;
uint32_t diffM;
uint32_t diffP;
uint32_t sum = 0u;
uint32_t maxSum = 0u;
uint32_t maxDiff = 0u;
uint32_t maxIndex = CY_CAPSENSE_NO_LOCAL_MAX;
const cy_stc_capsense_sensor_context_t * ptrSnsCxt;
int32_t numerator = 0;
int32_t denominator = 0;
uint32_t multiplier;
uint32_t offset;
if (CY_CAPSENSE_TOUCHPAD_MIN_COL_SNS_COUNT > colCount)
{
colCount = CY_CAPSENSE_TOUCHPAD_MIN_COL_SNS_COUNT;
}
if (CY_CAPSENSE_TOUCHPAD_MIN_ROW_SNS_COUNT > rowCount)
{
rowCount = CY_CAPSENSE_TOUCHPAD_MIN_ROW_SNS_COUNT;
}
if (1u == (ptrWdConfig->centroidConfig & CY_CAPSENSE_CENTROID_NUMBER_MASK))
{
/***********************************************************************
* X Axis (Cols)
***********************************************************************/
maxSum = 0u;
maxDiff = 0u;
/* Find maximum signal */
ptrSnsCxt = ptrWdConfig->ptrSnsContext;
for (snsIndex = 0u; snsIndex < colCount; snsIndex++)
{
if (ptrSnsCxt->diff > maxDiff)
{
maxDiff = ptrSnsCxt->diff;
}
ptrSnsCxt++;
}
/* Find index of sensor with maximum signal */
ptrSnsCxt = ptrWdConfig->ptrSnsContext;
for (snsIndex = 0u; snsIndex < colCount; snsIndex++)
{
/* Potential maximum */
if (maxDiff == ptrSnsCxt->diff)
{
/* Get sum of differences around maximum */
diffM = (snsIndex > 0u) ? (ptrSnsCxt - 1u)->diff : 0u;
diffP = (snsIndex < (colCount - 1u)) ? (ptrSnsCxt + 1u)->diff : 0u;
sum = ptrSnsCxt->diff + diffM + diffP;
/* Check whether this sum is maximum sum */
if (maxSum < sum)
{
/* New maximum */
maxIndex = snsIndex;
maxSum = sum;
numerator = (int32_t)diffP - (int32_t)diffM;
}
}
ptrSnsCxt++;
}
if ((maxIndex != CY_CAPSENSE_NO_LOCAL_MAX) && (maxSum > 0u))
{
/* Calculate position */
multiplier = (uint32_t)ptrWdConfig->xResolution << 8u;
if (0u == (ptrWdConfig->centroidConfig & CY_CAPSENSE_CALC_METHOD_MASK))
{
multiplier /= (colCount - 1u);
offset = 0u;
}
else
{
multiplier /= colCount;
offset = multiplier >> 1u;
}
denominator = (int32_t)maxSum;
denominator = ((numerator * (int32_t)multiplier) / denominator) + (((int32_t)maxIndex * (int32_t)multiplier) + (int32_t)offset);
/* Round result and shift 8 bits left */
newTouch->numPosition = CY_CAPSENSE_POSITION_ONE;
newTouch->ptrPosition[0u].x = (uint16_t)(((uint32_t)denominator + CY_CAPSENSE_CENTROID_ROUND_VALUE) >> 8u);
}
else
{
newTouch->numPosition = CY_CAPSENSE_POSITION_NONE;
}
if (newTouch->numPosition != CY_CAPSENSE_POSITION_NONE)
{
/***********************************************************************
* Y Axis (Rows)
***********************************************************************/
maxSum = 0u;
maxDiff = 0u;
maxIndex = CY_CAPSENSE_NO_LOCAL_MAX;
/* Find maximum signal */
ptrSnsCxt = &ptrWdConfig->ptrSnsContext[colCount];
for (snsIndex = colCount; snsIndex < snsCount; snsIndex++)
{
if (ptrSnsCxt->diff > maxDiff)
{
maxDiff = ptrSnsCxt->diff;
}
ptrSnsCxt++;
}
/* Find index of sensor with maximum signal */
ptrSnsCxt = &ptrWdConfig->ptrSnsContext[colCount];
for (snsIndex = 0u; snsIndex < rowCount; snsIndex++)
{
/* Potential maximum */
if (maxDiff == ptrSnsCxt->diff)
{
/* Get sum of differences around maximum */
diffM = (snsIndex > 0u) ? (ptrSnsCxt - 1u)->diff : 0u;
diffP = (snsIndex < (rowCount - 1u)) ? (ptrSnsCxt + 1u)->diff : 0u;
sum = ptrSnsCxt->diff + diffM + diffP;
/* Check if this sum is maximum sum */
if (maxSum < sum)
{
/* New maximum */
maxIndex = snsIndex;
maxSum = sum;
numerator = (int32_t)diffP - (int32_t)diffM;
}
}
ptrSnsCxt++;
}
if ((maxIndex != CY_CAPSENSE_NO_LOCAL_MAX) && (maxSum > 0u))
{
/* Calculate position */
multiplier = (uint32_t)ptrWdConfig->yResolution << 8u;
if (0u == (ptrWdConfig->centroidConfig & CY_CAPSENSE_CALC_METHOD_MASK))
{
multiplier /= (rowCount - 1u);
offset = 0u;
}
else
{
multiplier /= rowCount;
offset = multiplier >> 1u;
}
denominator = (int32_t)maxSum;
denominator = ((numerator * (int32_t)multiplier) / denominator) + (((int32_t)maxIndex * (int32_t)multiplier) + (int32_t)offset);
/* Round result and shift 8 bits left */
newTouch->ptrPosition[0].y = (uint16_t)(((uint32_t)denominator + CY_CAPSENSE_CENTROID_ROUND_VALUE) >> 8u);
}
else
{
newTouch->numPosition = CY_CAPSENSE_POSITION_NONE;
}
}
}
else
{
/* This is a place holder for local maximum searching when number of centroids could be more than one */
}
}
#endif /* (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSD_TOUCHPAD_EN) */
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_ADVANCED_CENTROID_5X5_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_DpAdvancedCentroidTouchpad
****************************************************************************//**
*
* Finds touch position of a CSD touchpad widget using an advanced centroid
* algorithm.
*
* This function is able to detect two touch positions using a centroid algorithm
* with matrix 5*5 of sensors and virtual sensors on the edges.
*
* \param newTouch
* The pointer to the touch structure where the found position is stored.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure.
*
*******************************************************************************/
void Cy_CapSense_DpAdvancedCentroidTouchpad(
cy_stc_capsense_touch_t * newTouch,
const cy_stc_capsense_widget_config_t * ptrWdConfig)
{
uint32_t i;
const cy_stc_capsense_sensor_context_t * ptrSnsIndex = ptrWdConfig->ptrSnsContext;
uint16_t * ptrDiffIndex = ptrWdConfig->ptrCsdTouchBuffer;
cy_stc_capsense_advanced_centroid_config_t advCfg;
advCfg.fingerTh = ptrWdConfig->ptrWdContext->fingerTh;
advCfg.penultimateTh = ptrWdConfig->advConfig.penultimateTh;
advCfg.virtualSnsTh = ptrWdConfig->advConfig.virtualSnsTh;
advCfg.resolutionX = ptrWdConfig->xResolution;
advCfg.resolutionY = ptrWdConfig->yResolution;
advCfg.snsCountX = ptrWdConfig->numCols;
advCfg.snsCountY = ptrWdConfig->numRows;
advCfg.crossCouplingTh = ptrWdConfig->advConfig.crossCouplingTh;
advCfg.edgeCorrectionEn = 0u;
advCfg.twoFingersEn = 0u;
if ((ptrWdConfig->centroidConfig & CY_CAPSENSE_CENTROID_NUMBER_MASK) > CY_CAPSENSE_POSITION_ONE)
{
advCfg.twoFingersEn = 1u;
}
if (0u != (ptrWdConfig->centroidConfig & CY_CAPSENSE_EDGE_CORRECTION_MASK))
{
advCfg.edgeCorrectionEn = 1u;
}
for (i = 0u; i < ptrWdConfig->numSns; i++)
{
ptrDiffIndex[i] = ptrSnsIndex[i].diff;
}
Cy_CapSense_AdvancedCentroidGetTouchCoordinates_Lib(
&advCfg,
ptrWdConfig->ptrCsdTouchBuffer,
newTouch);
}
#endif /* (CY_CAPSENSE_DISABLE != CY_CAPSENSE_ADVANCED_CENTROID_5X5_EN) */
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_DpFindLocalMaxDd
****************************************************************************//**
*
* Finds up to five local maximums for CSX Touchpad.
*
* This function takes an array of differences of the specified widget and
* finds up to five local maximums. The found maximums are stored in the CSX buffer
* ptrCsxTouchBuffer \ref cy_stc_capsense_csx_touch_buffer_t.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure
* \ref cy_stc_capsense_widget_config_t.
*
*******************************************************************************/
void Cy_CapSense_DpFindLocalMaxDd(
const cy_stc_capsense_widget_config_t * ptrWdConfig)
{
const cy_stc_capsense_widget_context_t * ptrWdCxt = ptrWdConfig->ptrWdContext;
const cy_stc_capsense_sensor_context_t * ptrSnsCxt = ptrWdConfig->ptrSnsContext;
uint32_t thresholdOff = (uint32_t)ptrWdCxt->fingerTh - ptrWdCxt->hysteresis;
uint32_t thresholdOn = (uint32_t)ptrWdCxt->fingerTh + ptrWdCxt->hysteresis;
uint16_t currDiff;
uint8_t rx;
uint8_t tx;
uint8_t snsShift;
uint8_t lastRx = ptrWdConfig->numCols - 1u;
uint8_t lastTx = ptrWdConfig->numRows - 1u;
uint32_t proceed = 0u;
uint32_t touchNum = 0u;
cy_stc_capsense_position_t * ptrNewPeak = &ptrWdConfig->ptrCsxTouchBuffer->newPeak[0u];
for (rx = CY_CAPSENSE_CSX_TOUCHPAD_MAX_PEAKS; rx-- > 0u;)
{
ptrNewPeak[rx].id = CY_CAPSENSE_CSX_TOUCHPAD_ID_UNDEFINED;
}
ptrNewPeak = &ptrWdConfig->ptrCsxTouchBuffer->newPeak[0u];
/* Go through all Rx electrodes */
for (rx = 0u; rx <= lastRx; rx++)
{
/*
* Go through all Tx and RX (changed above) electrodes intersections
* and check whether the local maximum requirement is met.
*/
for (tx = 0u; tx <= lastTx; tx++)
{
proceed = 0u;
currDiff = ptrSnsCxt->diff;
if (thresholdOff <= (uint32_t)currDiff)
{
/*
* Check local maximum requirement: Comparing raw count
* of a local maximum candidate with raw counts of sensors
* from the previous row.
*/
if (rx > 0u)
{
/* Check the sensor from the previous row and the next column */
snsShift = lastTx;
if ((tx < lastTx) && (currDiff <= (ptrSnsCxt - snsShift)->diff))
{
proceed = 1u;
}
if (0u == proceed)
{
/* Check the sensor from the previous row and the same column */
snsShift++;
if (currDiff <= (ptrSnsCxt - snsShift)->diff)
{
proceed = 1u;
}
}
if (0u == proceed)
{
/* Check the sensor from the previous row and the previous column */
snsShift++;
if ((tx > 0u) && (currDiff <= (ptrSnsCxt - snsShift)->diff))
{
proceed = 1u;
}
}
}
/*
* Check local maximum requirement: Comparing raw count
* of a local maximum candidate with raw counts of sensors
* from the next row.
*/
if ((0u == proceed) && (rx < lastRx))
{
/* Check the sensor from the next row and the next column */
snsShift = lastTx + 2u;
if ((tx < lastTx) && (currDiff < (ptrSnsCxt + snsShift)->diff))
{
proceed = 1u;
}
if (0u == proceed)
{
/* Check the sensor from the next row and the same column */
snsShift--;
if (currDiff < (ptrSnsCxt + snsShift)->diff)
{
proceed = 1u;
}
}
if (0u == proceed)
{
/* Check the sensor from the next row and the previous column */
snsShift--;
if ((tx > 0u) && (currDiff < (ptrSnsCxt + snsShift)->diff))
{
proceed = 1u;
}
}
}
/*
* Check local maximum requirement: Comparing raw count
* of a local maximum candidate with raw counts of sensors
* from the same row and the next column. */
if ((0u == proceed) && (tx < lastTx))
{
if (currDiff < (ptrSnsCxt + 1u)->diff)
{
proceed = 1u;
}
}
/* Check the sensor from the same row and the previous column */
if ((0u == proceed) && (tx > 0u))
{
if (currDiff <= (ptrSnsCxt - 1u)->diff)
{
proceed = 1u;
}
}
/* Add local maximum to the touch structure if there is room. */
if (0u == proceed)
{
ptrNewPeak->x = rx;
ptrNewPeak->y = tx;
if (currDiff < thresholdOn)
{
ptrNewPeak->id |= CY_CAPSENSE_CSX_TOUCHPAD_ID_ON_FAIL;
}
touchNum++;
ptrNewPeak++;
}
}
ptrSnsCxt++;
if (touchNum >= CY_CAPSENSE_CSX_TOUCHPAD_MAX_PEAKS)
{
break;
}
}
if (touchNum >= CY_CAPSENSE_CSX_TOUCHPAD_MAX_PEAKS)
{
break;
}
}
ptrWdConfig->ptrCsxTouchBuffer->newPeakNumber = (uint8_t)touchNum;
}
#endif /* (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN) */
#if (CY_CAPSENSE_DISABLE != CY_CAPSENSE_CSX_TOUCHPAD_EN)
/* CY_ID633 */
#if defined(__ICCARM__)
#pragma optimize=none
#endif /* (__ICCARM__) */
/*******************************************************************************
* Function Name: Cy_CapSense_DpCalcTouchPadCentroid
****************************************************************************//**
*
* Calculates the position for each local maximum using the 3x3 algorithm.
*
* This function calculates position coordinates of found local maximums.
* The found positions are stored in the CSX buffer ptrCsxTouchBuffer
* \ref cy_stc_capsense_csx_touch_buffer_t.
*
* \param ptrWdConfig
* The pointer to the widget configuration structure
* \ref cy_stc_capsense_widget_config_t.
*
*******************************************************************************/
void Cy_CapSense_DpCalcTouchPadCentroid(
const cy_stc_capsense_widget_config_t * ptrWdConfig)
{
const cy_stc_capsense_sensor_context_t * ptrSnsCxt = ptrWdConfig->ptrSnsContext;
uint8_t number;
uint8_t i;
uint8_t j;
uint32_t lastRx = (uint32_t)ptrWdConfig->numCols - 1u;
uint32_t lastTx = (uint32_t)ptrWdConfig->numRows - 1u;
uint16_t centroid[3u][3u];
int32_t weightedSumX;
int32_t weightedSumY;
uint32_t totalSum;
uint32_t multiplierX;
uint32_t offsetX;
uint32_t multiplierY;
uint32_t offsetY;
uint32_t touchNum = ptrWdConfig->ptrCsxTouchBuffer->newPeakNumber;
cy_stc_capsense_position_t * ptrNewPeak = &ptrWdConfig->ptrCsxTouchBuffer->newPeak[0];
for (number = 0u; number < touchNum; number++)
{
/* Set the sensor pointer to the local maximum sensor */
ptrSnsCxt = ptrWdConfig->ptrSnsContext;
ptrSnsCxt += (ptrNewPeak->y + (ptrNewPeak->x * ptrWdConfig->numRows));
/* Prepare 3x3 centroid two dimensional array */
/* Fill each row */
for (i = 0u; i < CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_LENGTH; i++)
{
/*
* The first condition could be valid only when local max on the first row (0 row) of Touchpad
* The second condition could be valid only when local max on the last row of Touchpad
* Then corresponding row (zero or the last) of 3x3 array is initialized to 0u
*/
if (((((int32_t)ptrNewPeak->x - 1) + (int32_t)i) < 0) ||
((((int32_t)ptrNewPeak->x - 1) + (int32_t)i) > (int32_t)lastRx))
{
centroid[CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_PREVIOUS][i] = 0u;
centroid[CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_CENTER][i] = 0u;
centroid[CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_NEXT][i] = 0u;
}
else
{
/* Fill each column */
for (j = 0u; j < CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_LENGTH; j++)
{
/*
* The first condition could be valid only when local max
* on the first column (0 row) of Touchpad. The second
* condition could be valid only when local max on the last
* column of Touchpad. Then corresponding column (zero or
* the last) of 3x3 array is initialized to 0u.
*/
if (((((int32_t)ptrNewPeak->y - 1) + (int32_t)j) < 0) ||
((((int32_t)ptrNewPeak->y - 1) + (int32_t)j) > (int32_t)lastTx))
{
centroid[j][i] = 0u;
}
else
{
centroid[j][i] = (uint16_t)(ptrSnsCxt + (((i - 1u) * ptrWdConfig->numRows) + (j - 1u)))->diff; //MISRA?
}
}
}
}
weightedSumX = 0;
weightedSumY = 0;
totalSum = 0u;
/* Calculate centroid */
for (i = 0u; i < CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_LENGTH; i++)
{
for (j = 0u; j < CY_CAPSENSE_CSX_TOUCHPAD_CENTROID_LENGTH; j++)
{
totalSum += centroid[i][j];
weightedSumX += (int32_t)centroid[i][j] * ((int32_t)j - 1);
weightedSumY += (int32_t)centroid[i][j] * ((int32_t)i - 1);
}
}
/* The X position is calculated.
* The weightedSumX value depends on a finger position shifted regarding
* the X electrode (ptrNewTouches.x).
* The multiplier ptrWdConfig->xCentroidMultiplier is a short from:
* CY_CAPSENSE_TOUCHPAD0_X_RESOLUTION * 256u) / (CY_CAPSENSE_TOUCHPAD0_NUM_RX - CONFIG))
* where CONFIG = 0 or 1 depends on TouchpadMultiplerMethod parameter.
*/
/* Calculate position */
multiplierX = (uint32_t)ptrWdConfig->xResolution << 8u;
multiplierY = (uint32_t)ptrWdConfig->yResolution << 8u;
if (0u == (ptrWdConfig->centroidConfig & CY_CAPSENSE_CALC_METHOD_MASK))
{
multiplierX /= lastRx;
offsetX = 0u;
multiplierY /= lastTx;
offsetY = 0u;
}
else
{
multiplierX /= (lastRx + 1u);
offsetX = multiplierX >> 1u;
multiplierY /= (lastTx + 1u);
offsetY = multiplierY >> 1u;
}
weightedSumX = ((weightedSumX * (int32_t)multiplierX) / (int32_t)totalSum) +
((((int32_t)ptrNewPeak->x) * (int32_t)multiplierX) + (int32_t)offsetX);
/* The X position is rounded to the nearest integer value and normalized to the resolution range */
ptrNewPeak->x = (uint16_t)(((uint32_t)weightedSumX + CY_CAPSENSE_CENTROID_ROUND_VALUE) >> 8u);
/* The Y position is calculated.
* The weightedSumY value depends on a finger position shifted regarding the Y electrode (ptrWdConfig->ptrNewTouches.y)
* The multiplier ptrWdConfig->yCentroidMultiplier is a short from:
* CY_CAPSENSE_TOUCHPAD0_Y_RESOLUTION * 256u) / (CY_CAPSENSE_TOUCHPAD0_NUM_TX - CONFIG))
* where CONFIG = 0 or 1 depends on TouchpadMultiplerMethod parameter
*/
weightedSumY = ((weightedSumY * (int32_t)multiplierY) / (int32_t)totalSum) +
((((int32_t)ptrNewPeak->y) * (int32_t)multiplierY) + (int32_t)offsetY);
/* The Y position is rounded to the nearest integer value and normalized to the resolution range */
ptrNewPeak->y = (uint16_t)(((uint32_t)weightedSumY + CY_CAPSENSE_CENTROID_ROUND_VALUE) >> 8u);
/* The z value is a summ of sensor difference counts divided by 16 that form 3x3 matrix with a local maximum in the center */
totalSum >>= CY_CAPSENSE_CSX_TOUCHPAD_Z_SHIFT;
if (totalSum > 0xFFu)
{
ptrNewPeak->z = 0xFFu;