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Copy pathcy_capsense_selftest_v2.c
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cy_capsense_selftest_v2.c
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/***************************************************************************//**
* \file cy_capsense_selftest_v2.c
* \version 6.10.0
*
* \brief
* This file provides the source code to the Built-in Self-test (BIST)
* functions.
*
********************************************************************************
* \copyright
* Copyright 2019-2025, 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 <string.h>
#include "cycfg_capsense_defines.h"
#include "cy_syslib.h"
#include "cy_capsense_common.h"
#include "cy_capsense_structure.h"
#include "cy_capsense_sensing.h"
#include "cy_capsense_sensing_v2.h"
#include "cy_capsense_lib.h"
#include "cy_capsense_selftest_v2.h"
#include "cy_gpio.h"
#if (defined(CY_IP_MXCSDV2) || defined(CY_IP_M0S8CSDV2))
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_BIST_EN)
/*******************************************************************************
* Common local definitions for self-test
*******************************************************************************/
/* Port Data Register macros for BIST */
#define CY_CAPSENSE_BIST_DR_PIN2GND (0u)
#define CY_CAPSENSE_BIST_DR_PIN2VDD (1u)
#define CY_CAPSENSE_BIST_CP_MAX_VALUE (400000u)
#define CY_CAPSENSE_BIST_PROMILLE_FACTOR (1000u)
#define CY_CAPSENSE_BIST_SNS_CLK_MIN_DIVIDER (4u)
#define CY_CAPSENSE_BIST_SNS_CLK_MAX_DIVIDER (4096u)
/* Macros for the electrode capacitance measurement test */
#define CY_CAPSENSE_BIST_ELTD_CAP_MAX_RAW_PROMILLE (450u)
#define CY_CAPSENSE_BIST_ELTD_CAP_MIN_RAW_PROMILLE (75u)
#define CY_CAPSENSE_BIST_ELTD_CAP_MAX_RESOLUTION (15u)
#define CY_CAPSENSE_BIST_ELTD_CAP_MIN_RESOLUTION (8u)
#define CY_CAPSENSE_BIST_ELTD_CAP_CYCLES_NUM (4u)
#define CY_CAPSENSE_BIST_ELTD_CAP_MAX_MODCLK (50000000u)
#define CY_CAPSENSE_BIST_SW_DSI_SEL_DEFAULT (0x00000000uL)
/* IDAC register mask */
#define CY_CAPSENSE_BIST_IDAC_BITS_TO_WRITE (CSD_IDACA_VAL_Msk |\
CSD_IDACA_RANGE_Msk |\
CSD_IDACA_LEG1_EN_Msk |\
CSD_IDACA_LEG2_EN_Msk |\
CSD_IDACA_LEG1_MODE_Msk |\
CSD_IDACA_LEG2_MODE_Msk)
#define CY_CAPSENSE_BIST_FSM_AZ0_SKIP (0x100u)
#define CY_CAPSENSE_BIST_FSM_AZ1_SKIP (0x200u)
/*******************************************************************************
* Macros for the external capacitor capacitance measurement test
*******************************************************************************/
#define CY_CAPSENSE_BIST_CAP_MEAS_DUTY_WIDTH (10u)
#define CY_CAPSENSE_BIST_CAP_MEAS_MAX_MODCLK (12500000u)
#define CY_CAPSENSE_BIST_CAP_MEAS_ACCURACY_FACTOR (1150u)
#define CY_CAPSENSE_BIST_CAP_MEAS_MIN_RAWCOUNT (10u)
#define CY_CAPSENSE_BIST_CAP_MEAS_MAX_CAP (25u)
#define CY_CAPSENSE_BIST_CAP_MEAS_CMOD_MAX_VALUE (5u)
#define CY_CAPSENSE_BIST_CAP_MEAS_CINT_MAX_VALUE (1u)
#define CY_CAPSENSE_BIST_CAP_MEAS_CSH_MAX_VALUE (20u)
#define CY_CAPSENSE_BIST_CAP_MEAS_VREF_MV_DEFAULT (1200u)
#define CY_CAPSENSE_BIST_CAP_MEAS_WDT_CYCLES_PER_LOOP (5u)
#define CY_CAPSENSE_BIST_CAP_MEAS_WDT_TIMEOUT (3000u)
#define CY_CAPSENSE_BIST_PRECHARGE_MAX_TIME_US (6000u)
#define CY_CAPSENSE_BIST_WATCHDOG_MARGIN_COEFF (3u)
#define CY_CAPSENSE_BIST_PRECHARGE_WATCHDOG_TIME_US (CY_CAPSENSE_BIST_PRECHARGE_MAX_TIME_US *\
CY_CAPSENSE_BIST_WATCHDOG_MARGIN_COEFF)
/* HW block register values */
#define CY_CAPSENSE_BIST_CAP_SEQ_START_DEFAULT (CY_CAPSENSE_CSD_SEQ_START_AZ0_SKIP_MSK | \
CY_CAPSENSE_CSD_SEQ_START_AZ1_SKIP_MSK | \
CY_CAPSENSE_CSD_SEQ_START_START_MSK)
#define CY_CAPSENSE_BIST_CAP_CSDCMP_DEFAULT (CY_CAPSENSE_CSD_CSDCMP_CMP_PHASE_PHI2_MSK | \
CY_CAPSENSE_CSD_CSDCMP_CSDCMP_EN_MSK)
#define CY_CAPSENSE_BIST_CAP_SENSE_DUTY_DEFAULT (CSD_SENSE_DUTY_OVERLAP_PHI1_Msk | \
CSD_SENSE_DUTY_OVERLAP_PHI2_Msk | \
CY_CAPSENSE_BIST_CAP_MEAS_DUTY_WIDTH)
#define CY_CAPSENSE_BIST_CAP_SW_BYP_SEL_DEFAULT (CY_CAPSENSE_CSD_SW_BYP_SEL_SW_BYA_MSK)
#define CY_CAPSENSE_BIST_CAP_SW_CMP_N_SEL_DEFAULT (CY_CAPSENSE_CSD_SW_CMP_N_SEL_SW_SCRH_STATIC_CLOSE)
#define CY_CAPSENSE_BIST_CAP_SW_CMP_P_SEL_DEFAULT (CY_CAPSENSE_CSD_SW_CMP_P_SEL_SW_SFMA_STATIC_CLOSE)
#define CY_CAPSENSE_BIST_CAP_SW_REFGEN_SEL_SRSS_DEFAULT (CY_CAPSENSE_CSD_SW_REFGEN_SEL_SW_SGR_MSK)
#if (CY_CAPSENSE_PSOC6_FOURTH_GEN)
#define CY_CAPSENSE_BIST_CAP_SW_REFGEN_SEL_PASS_DEFAULT (CY_CAPSENSE_CSD_SW_REFGEN_SEL_SW_SGRP_MSK)
#define CY_CAPSENSE_BIST_CAP_IO_SEL_DEFAULT (CY_CAPSENSE_CSD_TX_N_OUT_EN_PHI1 | \
CY_CAPSENSE_CSD_TX_N_AMUXA_EN_PHI2)
#endif
#define CY_CAPSENSE_BIST_CAP_REFGEN_DEFAULT (CSD_REFGEN_REFGEN_EN_Msk | CSD_REFGEN_RES_EN_Msk)
#define CY_CAPSENSE_BIST_CAP_REFGEN_LOW_VOLTAGE_DEFAULT (CSD_REFGEN_REFGEN_EN_Msk | CSD_REFGEN_BYPASS_Msk)
#define CY_CAPSENSE_BIST_CAP_CONFIG_DEFAULT (CY_CAPSENSE_CSD_CONFIG_FILTER_DELAY_48MHZ | \
CSD_CONFIG_SENSE_EN_Msk | \
CSD_CONFIG_ENABLE_Msk)
#if (CY_CAPSENSE_PSOC6_FOURTH_GEN)
#define CY_CAPSENSE_BIST_CAP_CONFIG_IREF_DEFAULT (CY_CAPSENSE_BIST_CAP_CONFIG_DEFAULT | \
CY_CAPSENSE_CSD_CONFIG_IREF_SEL_MSK)
#endif
#define CY_CAPSENSE_BIST_CAP_IDAC_MODE_DEFAULT (CSD_IDACA_LEG1_MODE_Msk |\
CSD_IDACA_LEG2_MODE_Msk)
/*******************************************************************************
* Macros for the VDDA measurement test
*******************************************************************************/
/* SenseClkDivider value for VDDA measurement mode */
#define CY_CAPSENSE_BIST_VDDA_SENSE_DIV_DEFAULT (0x4u)
/* Minimal acceptable difference between the VDDA and VREF.
It is not allowed to have (VDDA - VREF) > CY_CAPSENSE_BIST_VDDA_MIN_DIFF. */
#define CY_CAPSENSE_BIST_VDDA_MIN_DIFF (600u)
/* VREF voltage value, used for the VDDA measurement */
#define CY_CAPSENSE_BIST_VDDA_VREF_MIN_MV (1200u)
/* VDDA measurement resolution */
#define CY_CAPSENSE_BIST_VDDA_RES (2047u)
/* The total capacitance value of reference capacitors */
#define CY_CAPSENSE_BIST_VDDA_CREF (21500u)
/* The IDAC gain value, used for the VDDA measurement */
#define CY_CAPSENSE_BIST_VDDA_IDAC_LSB (37500u)
/* The MAX possible IDAC code value. */
#define CY_CAPSENSE_BIST_IDAC_MAX (127u)
/* The number of initial conversions per sample, used for the VDDA measurement */
#define CY_CAPSENSE_BIST_VDDA_INIT_CYCLES_NUM (1u)
/* The number of normal conversions per sample, used for the VDDA measurement */
#define CY_CAPSENSE_BIST_VDDA_NORM_CYCLES_NUM (2u)
/* The duration of the auto-zero stage in microseconds */
#define CY_CAPSENSE_BIST_VDDA_AZ_TIME_US (5u)
/* Acquisition time in microseconds */
#define CY_CAPSENSE_BIST_VDDA_ACQ_TIME_US (10u)
/* Acquisition time in microseconds */
#define CY_CAPSENSE_BIST_VDDA_MAX_MODCLK (50000000u)
/* Configures the count time A to bring Cref1 + Cref2 up from Vssa to Vrefhi with IDACB */
#define CY_CAPSENSE_BIST_VDDA_MEASMODE_VREF (0x1uL << CSD_ADC_CTL_ADC_MODE_Pos)
/*
* Configures count time B to bring Cref1 + Cref2 back up to Vrefhi with IDACB
* (after bringing them down for time A/2 cycles with IDACB sinking)
*/
#define CY_CAPSENSE_BIST_VDDA_MEASMODE_VREFBY2 (0x2uL << CSD_ADC_CTL_ADC_MODE_Pos)
/* Configures the HSCMP polarity and count time C to source/sink Cref1 + Cref2 from Vin to Vrefhi */
#define CY_CAPSENSE_BIST_VDDA_MEASMODE_VIN (0x3uL << CSD_ADC_CTL_ADC_MODE_Pos)
/* Default HW block operation settings that are required for VDDA measurement */
#define CY_CAPSENSE_BIST_VDDA_CONFIG_DEFAULT (CY_CAPSENSE_CSD_CONFIG_ENABLE_MSK |\
CY_CAPSENSE_CSD_CONFIG_SAMPLE_SYNC_MSK |\
CY_CAPSENSE_CSD_CONFIG_SENSE_EN_MSK |\
CY_CAPSENSE_CSD_CONFIG_DSI_COUNT_SEL_MSK)
#define CY_CAPSENSE_BIST_VDDA_AMBUF_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_CSDCMP_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_HSCMP_DEFAULT (CY_CAPSENSE_CSD_HSCMP_HSCMP_EN_MSK |\
CY_CAPSENSE_CSD_HSCMP_AZ_EN_MSK)
#define CY_CAPSENSE_BIST_VDDA_IDACA_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_IDACB_DEFAULT ((CY_CAPSENSE_CSD_IDACB_POL_DYN_DYNAMIC << \
CY_CAPSENSE_CSD_IDACB_POL_DYN_POS) |\
CY_CAPSENSE_CSD_IDACB_LEG3_EN_MSK)
#define CY_CAPSENSE_BIST_VDDA_SW_RES_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_SENSE_PERIOD_DEFAULT (CY_CAPSENSE_BIST_VDDA_SENSE_DIV_DEFAULT)
#define CY_CAPSENSE_BIST_VDDA_SENSE_DUTY_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_SEQ_INIT_CNT_DEFAULT (CY_CAPSENSE_BIST_VDDA_INIT_CYCLES_NUM)
#define CY_CAPSENSE_BIST_VDDA_SEQ_NORM_CNT_DEFAULT (CY_CAPSENSE_BIST_VDDA_NORM_CYCLES_NUM)
#define CY_CAPSENSE_BIST_VDDA_IO_SEL_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_SEQ_START_MEASURE (CY_CAPSENSE_CSD_SEQ_START_AZ0_SKIP_MSK |\
CY_CAPSENSE_CSD_SEQ_START_START_MSK)
#define CY_CAPSENSE_BIST_VDDA_SW_HS_P_SEL_DEFAULT (CY_CAPSENSE_CSD_SW_HS_P_SEL_SW_HMRH_STATIC_CLOSE)
#define CY_CAPSENSE_BIST_VDDA_SW_HS_N_SEL_DEFAULT (CY_CAPSENSE_CSD_SW_HS_N_SEL_SW_HCCD_STATIC_CLOSE)
#define CY_CAPSENSE_BIST_VDDA_SW_SHIELD_SEL_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_SW_AMUXBUF_SEL_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_SW_BYP_SEL_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_SW_CMP_P_SEL_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_SW_CMP_N_SEL_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_SW_DSI_SEL_DEFAULT (0u)
#define CY_CAPSENSE_BIST_VDDA_SW_FW_MOD_SEL_DEFAULT (CY_CAPSENSE_CSD_SW_FW_MOD_SEL_SW_C1CC_STATIC_CLOSE |\
CY_CAPSENSE_CSD_SW_FW_MOD_SEL_SW_C1CD_STATIC_CLOSE)
#define CY_CAPSENSE_BIST_VDDA_SW_FW_TANK_SEL_DEFAULT (CY_CAPSENSE_CSD_SW_FW_TANK_SEL_SW_C2CC_STATIC_CLOSE |\
CY_CAPSENSE_CSD_SW_FW_TANK_SEL_SW_C2CD_STATIC_CLOSE)
#define CY_CAPSENSE_BIST_VDDA_WDT_CYCLES_PER_LOOP (5u)
#define CY_CAPSENSE_BIST_VDDA_MAX_16_BITS (65535u)
/* In milliseconds */
#define CY_CAPSENSE_BIST_VDDA_WDT_TIMEOUT (10000u)
/*******************************************************************************
* Function Prototypes
*******************************************************************************/
/******************************************************************************/
/** \cond SECTION_CAPSENSE_INTERNAL */
/** \addtogroup group_capsense_internal *//** \{ */
/******************************************************************************/
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_WDGT_CRC_EN)
/* CRC test-related functions */
static cy_en_capsense_bist_status_t Cy_CapSense_CheckAllWidgetCRC(
cy_stc_capsense_context_t * context);
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_WDGT_CRC_EN) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_SHORT_EN)
/* Check Integrity Sensor Pins test-related functions */
static cy_en_capsense_bist_status_t Cy_CapSense_SnsShortCheckSensor(
uint32_t widgetId,
uint32_t sensorId,
uint32_t mode,
cy_stc_capsense_context_t * context);
static cy_en_capsense_bist_status_t Cy_CapSense_SnsShortCheckElectrode(
uint32_t widgetId,
uint32_t ioSnsId,
uint32_t mode,
const cy_stc_capsense_context_t * context);
static void Cy_CapSense_SnsShortUpdateTestResult(
uint32_t widgetId,
uint32_t sensorId,
cy_stc_capsense_context_t * context);
static cy_en_capsense_bist_status_t Cy_CapSense_SnsShortCheckAllSensors(
cy_stc_capsense_context_t * context);
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_SHORT_EN) */
#if ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SH_CAP_EN) ||\
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_CAP_EN))
/* Measure Capacitance Sensor and Shield test-related functions */
static void Cy_CapSense_BistMeasureCapacitanceSensorInit(
cy_stc_capsense_context_t * context);
static void Cy_CapSense_BistMeasureCapacitanceSensorEnable(
cy_stc_capsense_context_t * context);
static cy_en_capsense_bist_status_t Cy_CapSense_BistMeasureCapacitanceSensor(
uint32_t * cpPtr,
cy_stc_capsense_context_t * context);
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_CSD_SHIELD_EN)
static void Cy_CapSense_BistMeasureCapacitanceSensorShieldEnable(
cy_stc_capsense_context_t * context);
#endif
static cy_en_capsense_bist_status_t Cy_CapSense_BistMeasureCapacitanceSensorRun(
cy_stc_capsense_context_t * context);
#endif /* ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SH_CAP_EN) ||\
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_CAP_EN)) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_CAP_EN)
static cy_en_capsense_bist_status_t Cy_CapSense_BistMeasureCapacitanceSensorAll(
cy_stc_capsense_context_t * context);
#endif
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_EXTERNAL_CAP_EN)
/* Measure Capacitance Capacitor test-related functions */
static void Cy_CapSense_BistMeasureCapacitanceCapInit(
cy_stc_capsense_context_t * context);
static void Cy_CapSense_BistMeasureCapacitanceCapEnable(
cy_stc_capsense_context_t * context);
static cy_en_capsense_bist_status_t Cy_CapSense_BistMeasureCapacitanceCapRun(
uint32_t * ptrExtCapValue,
cy_stc_capsense_context_t * context);
static cy_en_capsense_bist_status_t Cy_CapSense_BistMeasureCapacitanceCapAll(
cy_stc_capsense_context_t * context);
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_EXTERNAL_CAP_EN) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_VDDA_EN)
/* Measure VDDA test-related functions */
static void Cy_CapSense_BistMeasureVddaInit(
cy_stc_capsense_context_t * context);
static void Cy_CapSense_BistMeasureVddaEnable(
cy_stc_capsense_context_t * context);
static cy_en_capsense_bist_status_t Cy_CapSense_BistMeasureVddaRun(
cy_stc_capsense_context_t * context);
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_VDDA_EN) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_SHORT_EN)
static void Cy_CapSense_SetPinDr(
cy_stc_capsense_pin_config_t const *ioPtr,
uint32_t value);
static void Cy_CapSense_SetPinPc(
cy_stc_capsense_pin_config_t const *ioPtr,
uint32_t value);
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_SHORT_EN) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_HW_GROUP_EN)
/* Common functions for all hardware-dependent tests */
static void Cy_CapSense_BistSwitchHwConfig(
cy_en_capsense_bist_hw_config_t hwCfg,
cy_stc_capsense_context_t * context);
static void Cy_CapSense_BistSwitchAllSnsPinState(
cy_en_capsense_bist_io_state_t desiredPinState,
const cy_stc_capsense_context_t * context);
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_CSD_SHIELD_EN)
static void Cy_CapSense_BistSwitchAllShieldPinState(
cy_en_capsense_bist_io_state_t desiredPinState,
const cy_stc_capsense_context_t * context);
static void Cy_CapSense_SetShieldPinState(
uint32_t desiredDriveMode,
uint32_t desiredPinOutput,
en_hsiom_sel_t desiredHsiom,
const cy_stc_capsense_context_t * context);
#endif
static void Cy_CapSense_BistSwitchAllExternalCapPinState(
cy_en_capsense_bist_io_state_t desiredPinState,
const cy_stc_capsense_context_t * context);
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_HW_GROUP_EN) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_CAP_EN)
static void Cy_CapSense_BistConnectElectrode(
uint32_t widgetId,
uint32_t electrodeId,
const cy_stc_capsense_context_t * context);
static void Cy_CapSense_BistDisconnectElectrode(
uint32_t widgetId,
uint32_t electrodeId,
const cy_stc_capsense_context_t * context);
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_CAP_EN) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_CAP_EN) || \
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SH_CAP_EN) || \
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_EXTERNAL_CAP_EN)
static uint32_t Cy_CapSense_BistWaitEndOfScan(
uint32_t watchdogCycleNum,
const cy_stc_capsense_context_t * context);
#endif
/** \} \endcond */
/*******************************************************************************
* Function Name: Cy_CapSense_RunSelfTest_V2
****************************************************************************//**
*
* Runs built-in self-tests specified by the test enable mask.
*
* The function performs various self-tests on all the enabled widgets
* and sensors in the project. Select the required set of tests
* using the bit-mask in testEnMask parameter.
*
* Use CY_CAPSENSE_TST_RUN_SELF_TEST_MASK to execute all the self-tests or
* any combination of the masks (defined in testEnMask parameter) to specify the
* desired test list.
*
* To execute a single-element test (i.e. for one widget or one sensor),
* the following low-level functions are available:
* - Cy_CapSense_CheckCRCWidget()
* - Cy_CapSense_CheckIntegritySensorPins()
* - Cy_CapSense_MeasureCapacitanceSensor()
* - Cy_CapSense_MeasureCapacitanceShield()
* - Cy_CapSense_MeasureCapacitanceCap_V2()
* - Cy_CapSense_MeasureVdda()
*
* Refer to these functions descriptions for detail information
* on the corresponding test.
*
* \note
* This function is available only for the fourth-generation CAPSENSE™.
*
* \param testEnMask
* Specifies the tests to be executed. Each bit corresponds to one test. It is
* possible to launch the function with any combination of the available tests.
* - CY_CAPSENSE_BIST_CRC_WDGT_MASK - Verifies the RAM widget structure CRC
* for all the widgets.
* - CY_CAPSENSE_BIST_SNS_INTEGRITY_MASK - Checks all the sensor pins for a short
* to GND / VDD / other sensors.
* - CY_CAPSENSE_BIST_SNS_CAP_MASK - Measures all the sensors capacitance.
* - CY_CAPSENSE_BIST_SHIELD_CAP_MASK - Measures the shield capacitance.
* - CY_CAPSENSE_BIST_EXTERNAL_CAP_MASK - Measures the capacitance of the
* available external capacitors.
* - CY_CAPSENSE_BIST_VDDA_MASK - Measures the VDDA voltage.
* - CY_CAPSENSE_BIST_RUN_AVAILABLE_SELF_TEST_MASK
* - Executes all available tests.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns a bit-mask with a status of execution of the specified tests:
* - CY_CAPSENSE_BIST_SUCCESS_E - All the tests passed successfully.
* - CY_CAPSENSE_BIST_BAD_PARAM_E - A non-defined test was requested in the
* testEnMask parameter or the context is
* a NULL pointer. The function
* was not performed.
* - CY_CAPSENSE_BIST_HW_BUSY_E - The CSD HW block is busy with a previous
* operation. The function was not performed.
* - CY_CAPSENSE_BIST_ERROR_E - An unexpected fault occurred during
* the measurement, you may need to repeat
* the measurement.
* - CY_CAPSENSE_BIST_FAIL_E - Any of tests specified by the testEnMask
* parameters has faulted.
*
*******************************************************************************/
cy_en_capsense_bist_status_t Cy_CapSense_RunSelfTest_V2(
uint32_t testEnMask,
cy_stc_capsense_context_t * context)
{
cy_en_capsense_bist_status_t result = CY_CAPSENSE_BIST_BAD_PARAM_E;
#if ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_WDGT_CRC_EN) || \
((CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_HW_GROUP_EN) && \
((CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_VDDA_EN) || \
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_EXTERNAL_CAP_EN) || \
((CY_CAPSENSE_ENABLE == CY_CAPSENSE_CSD_SHIELD_EN) && \
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SH_CAP_EN)) || \
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_SHORT_EN) || \
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_CAP_EN))))
cy_en_capsense_bist_status_t bistStatus;
#endif
#if ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_HW_GROUP_EN) && \
((CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_VDDA_EN) || \
((CY_CAPSENSE_ENABLE == CY_CAPSENSE_CSD_SHIELD_EN) && \
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SH_CAP_EN))))
uint32_t tmpVal;
#endif
if (0u == (testEnMask & (~CY_CAPSENSE_BIST_RUN_AVAILABLE_SELF_TEST_MASK)))
{
if (NULL != context)
{
if (CY_CAPSENSE_NOT_BUSY == Cy_CapSense_IsBusy(context))
{
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_WDGT_CRC_EN)
if (0u != (CY_CAPSENSE_BIST_CRC_WDGT_MASK & testEnMask))
{
bistStatus = Cy_CapSense_CheckAllWidgetCRC(context);
if (CY_CAPSENSE_BIST_SUCCESS_E != bistStatus)
{
result = CY_CAPSENSE_BIST_FAIL_E;
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_CRC_WDGT_MASK;
}
}
#endif
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_HW_GROUP_EN)
/* The next group of tests is hardware-dependent, the request is to switch the sense method */
if (CY_CAPSENSE_SUCCESS_E == Cy_CapSense_SwitchSensingMode(CY_CAPSENSE_BIST_GROUP, context))
{
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_VDDA_EN)
if (0u != (CY_CAPSENSE_BIST_VDDA_MASK & testEnMask))
{
bistStatus = Cy_CapSense_MeasureVdda_V2(&tmpVal, context);
if (CY_CAPSENSE_BIST_SUCCESS_E != bistStatus)
{
result = CY_CAPSENSE_BIST_FAIL_E;
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_VDDA_MASK;
}
}
#endif
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_EXTERNAL_CAP_EN)
if (0u != (CY_CAPSENSE_BIST_EXTERNAL_CAP_MASK & testEnMask))
{
bistStatus = Cy_CapSense_BistMeasureCapacitanceCapAll(context);
if (CY_CAPSENSE_BIST_SUCCESS_E != bistStatus)
{
result = CY_CAPSENSE_BIST_FAIL_E;
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_EXTERNAL_CAP_MASK;
}
}
#endif
#if ((CY_CAPSENSE_ENABLE == CY_CAPSENSE_CSD_SHIELD_EN) && \
(CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SH_CAP_EN))
if (0u != (CY_CAPSENSE_BIST_SHIELD_CAP_MASK & testEnMask))
{
bistStatus = Cy_CapSense_MeasureCapacitanceShield(&tmpVal, context);
if (CY_CAPSENSE_BIST_SUCCESS_E != bistStatus)
{
result = CY_CAPSENSE_BIST_FAIL_E;
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_SHIELD_CAP_MASK;
}
}
#endif
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_SHORT_EN)
if (0u != (CY_CAPSENSE_BIST_SNS_INTEGRITY_MASK & testEnMask))
{
bistStatus = Cy_CapSense_SnsShortCheckAllSensors(context);
if (CY_CAPSENSE_BIST_SUCCESS_E != bistStatus)
{
result = CY_CAPSENSE_BIST_FAIL_E;
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_SNS_INTEGRITY_MASK;
}
}
#endif
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_CAP_EN)
if (0u != (CY_CAPSENSE_BIST_SNS_CAP_MASK & testEnMask))
{
bistStatus = Cy_CapSense_BistMeasureCapacitanceSensorAll(context);
if (CY_CAPSENSE_BIST_SUCCESS_E != bistStatus)
{
result = CY_CAPSENSE_BIST_FAIL_E;
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_SNS_CAP_MASK;
}
}
#endif
}
else
{
result = CY_CAPSENSE_BIST_ERROR_E;
}
#endif
if (CY_CAPSENSE_BIST_FAIL_E != result)
{
result = CY_CAPSENSE_BIST_SUCCESS_E;
}
}
else
{
result = CY_CAPSENSE_BIST_HW_BUSY_E;
}
}
}
return result;
}
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_WDGT_CRC_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_CheckCRCWidget_V2
****************************************************************************//**
*
* Checks the stored CRC of the \ref cy_stc_capsense_widget_context_t data
* structure of the specified widget.
*
* This function validates the data integrity of the
* \ref cy_stc_capsense_widget_context_t data structure of the specified widget
* by calculating the CRC and comparing it with the stored CRC value of the
* specified widget.
*
* Initially, after the device power up, the Cy_CapSense_Enable() function
* calculates CRC for each widget and stores them in the .ptrWdgtCrc[] array
* of the \ref cy_stc_capsense_bist_context_t structure. The test execution
* compares this stored CRC value with the newly calculated and if the stored
* and calculated CRC values differ:
* 1. The calculated CRC is stored to the .wdgtCrcCalc field
* of the \ref cy_stc_capsense_bist_context_t data structure.
* 2. The widget ID is stored to the .crcWdgtId field.
* 3. The CY_CAPSENSE_BIST_CRC_WDGT_MASK bit is set in the .testResultMask field.
*
* The function never clears the CY_CAPSENSE_BIST_CRC_WDGT_MASK bit.
* If the CY_CAPSENSE_BIST_CRC_WDGT_MASK bit is set, the wdgtCrcCalc
* and .crcWdgtId fields are not updated.
*
* It is recommended to use the Cy_CapSense_SetParam() function to change
* the value of the \ref cy_stc_capsense_widget_context_t data structure elements
* as the CRC is updated by Cy_CapSense_SetParam() function.
*
* You can initiate this test by the Cy_CapSense_RunSelfTest() function with
* the CY_CAPSENSE_BIST_CRC_WDGT_MASK mask as an input.
*
* The function clears the CY_CAPSENSE_WD_WORKING_MASK bit of the .status
* field in \ref cy_stc_capsense_widget_context_t structure if the calculated
* CRC value differs to the stored CRC value.
* Those non-working widgets are skipped by the high-level scanning and
* processing functions. Restoring a widget to its working state should
* be done by the application level.
*
* For details of the used CRC algorithm, refer to the Cy_CapSense_GetCRC()
* function.
*
* \note
* This function is available only for the fourth-generation CAPSENSE™.
*
* \param widgetId
* Specifies the ID number of the widget.
* A macro for the widget ID can be found in the
* CAPSENSE™ Configuration header file (cycfg_capsense.h) defined as
* CY_CAPSENSE_<WidgetName>_WDGT_ID.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns a status of the test execution:
* - CY_CAPSENSE_BIST_SUCCESS_E - The stored CRC matches
* the calculated CRC.
* - CY_CAPSENSE_BIST_FAIL_E - The widget CRC differs to
* the stored CRC.
* - CY_CAPSENSE_BIST_BAD_PARAM_E - The input parameters are invalid.
* The test was not executed.
*
*******************************************************************************/
cy_en_capsense_bist_status_t Cy_CapSense_CheckCRCWidget_V2(
uint32_t widgetId,
cy_stc_capsense_context_t * context)
{
uint16_t crcValue;
cy_en_capsense_bist_status_t result = CY_CAPSENSE_BIST_BAD_PARAM_E;
if (NULL != context)
{
if (context->ptrCommonConfig->numWd > widgetId)
{
crcValue = Cy_CapSense_GetCrcWidget(widgetId, context);
if ((context->ptrBistContext->ptrWdgtCrc[widgetId]) != crcValue)
{
/* Write to the self-test data structure widgetId of the first badly-tested widget */
if (0Lu == (context->ptrBistContext->testResultMask & CY_CAPSENSE_BIST_CRC_WDGT_MASK))
{
context->ptrBistContext->wdgtCrcCalc = crcValue;
context->ptrBistContext->crcWdgtId = (uint8_t)widgetId;
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_CRC_WDGT_MASK;
}
/* Marks widget non-working */
(void)Cy_CapSense_SetWidgetStatus(widgetId, 0u, CY_CAPSENSE_WD_WORKING_MASK, context);
result = CY_CAPSENSE_BIST_FAIL_E;
}
else
{
result = CY_CAPSENSE_BIST_SUCCESS_E;
}
}
}
return result;
}
/*******************************************************************************
* Function Name: Cy_CapSense_CheckAllWidgetCRC
****************************************************************************//**
*
* The internal function that checks CRC of all widget structures.
*
* The function calculates CRC of all widget structures and compare it
* to the stored CRCs. It is called by the Cy_CapSense_RunSelfTest() function.
* In the first case of failed comparison the function updates
* testResultMask and returns the status. Next widgets are not checked.
* The function use the Cy_CapSense_CheckCRCWidget() function.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns the status of the test processing:
* - CY_CAPSENSE_BIST_SUCCESS_E if all widget CRC are OK;
* - CY_CAPSENSE_BIST_FAIL_E if any widget CRC is wrong.
*
*******************************************************************************/
static cy_en_capsense_bist_status_t Cy_CapSense_CheckAllWidgetCRC(
cy_stc_capsense_context_t * context)
{
cy_en_capsense_bist_status_t result = CY_CAPSENSE_BIST_SUCCESS_E;
uint32_t widgetId;
for (widgetId = 0u; widgetId < context->ptrCommonConfig->numWd; widgetId++)
{
if (CY_CAPSENSE_BIST_SUCCESS_E != (Cy_CapSense_CheckCRCWidget_V2(widgetId, context)))
{
result = CY_CAPSENSE_BIST_FAIL_E;
break;
}
}
return result;
}
/*******************************************************************************
* Function Name: Cy_CapSense_UpdateCrcWidget
****************************************************************************//**
*
* The internal function updates the CRC
* of the \ref cy_stc_capsense_widget_context_t data structure
* for the specified widget.
*
* The function implements the following functionality:
* - Executes the Cy_CapSense_GetCRC() routine for the specified widget.
* - Updates the self-test CRC array with the CRC value, calculated for the
* specified widget.
*
* The CRC value is stored in the special wdgtCrc[CY_CAPSENSE_WIDGET_COUNT] array
* declared in the cycfg_capsense.c file.
*
* \param widgetId
* Specifies the ID number of the widget.
* A macro for the widget ID can be found in the
* CAPSENSE™ Configuration header file (cycfg_capsense.h) defined as
* CY_CAPSENSE_<WidgetName>_WDGT_ID.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_UpdateCrcWidget(
uint32_t widgetId,
cy_stc_capsense_context_t * context)
{
uint16_t crcValue;
crcValue = Cy_CapSense_GetCrcWidget(widgetId, context);
/* Write the calculated CRC value to the self-test CRC array */
context->ptrBistContext->ptrWdgtCrc[widgetId] = crcValue;
}
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_WDGT_CRC_EN) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_BSLN_INTEGRITY_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_CheckIntegritySensorBaseline_V2
****************************************************************************//**
*
* Checks if the baseline of the specified sensor is not corrupted
* by comparing it with its inverse copy and checks if the baseline is
* within the specified range.
*
* The function checks whether or not the baseline binary inverted to
* its inverse copy is saved to the self-test baseline-inverse structure
* and is within the user-defined limits. If the baseline does
* not match its inverse copy or if the baseline is out of the user-defined
* limits, the function sets the CY_CAPSENSE_BIST_BSLN_INTEGRITY_MASK bit
* in the .testResultMask field of the \ref cy_stc_capsense_bist_context_t
* structure.
*
* The test is integrated into the CAPSENSE™ Middleware. All CAPSENSE™
* processing functions like Cy_CapSense_ProcessAllWidgets()
* or Cy_CapSense_UpdateSensorBaseline() automatically verify the baseline
* value before using it and update its inverse copy after processing.
* If a baseline update fails, a CY_CAPSENSE_STATUS_BAD_DATA result
* is returned. The baseline initialization functions do not verify the
* baseline and update the baseline inverse copy.
*
* This function does not update the CY_CAPSENSE_WD_WORKING_MASK bit of
* the .status field in \ref cy_stc_capsense_widget_context_t structure
* and is not available in the Cy_CapSense_RunSelfTest() function.
*
* Use this function to verify the uniformity of sensors, for example, at
* mass-production or during an operation phase together with the
* Cy_CapSense_CheckIntegritySensorRawcount() function.
*
* \note
* This function is available only for the fourth-generation CAPSENSE™.
*
* \param widgetId
* Specifies the ID number of the widget.
* A macro for the widget ID can be found in the
* CAPSENSE™ Configuration header file (cycfg_capsense.h) defined as
* CY_CAPSENSE_<WidgetName>_WDGT_ID.
*
* \param sensorId
* Specifies the ID number of the sensor within the widget.
* A macro for the sensor ID within the specified widget can be found in
* the CAPSENSE™ Configuration header file (cycfg_capsense.h) defined as
* CY_CAPSENSE_<WidgetName>_SNS<SensorNumber>_ID.
*
* \param baselineHighLimit
* Specifies the upper limit for a baseline.
*
* \param baselineLowLimit
* Specifies the lower limit for a baseline.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns a status of the test execution:
* - CY_CAPSENSE_BIST_SUCCESS_E - The baseline is within the
* specified range.
* - CY_CAPSENSE_BIST_FAIL_E - The test failed and the baseline
* is not binary inverted to its inverse
* copy or is out of the specified limits.
* - CY_CAPSENSE_BIST_BAD_PARAM_E - The input parameter is invalid.
* The test was not executed.
*
*******************************************************************************/
cy_en_capsense_bist_status_t Cy_CapSense_CheckIntegritySensorBaseline_V2(
uint32_t widgetId,
uint32_t sensorId,
uint16_t baselineHighLimit,
uint16_t baselineLowLimit,
cy_stc_capsense_context_t * context)
{
cy_en_capsense_bist_status_t result = CY_CAPSENSE_BIST_BAD_PARAM_E;
uint16_t bslnInv;
uint32_t freqChIndex;
uint32_t cxtOffset;
const cy_stc_capsense_sensor_context_t *ptrSnsCxt;
cy_stc_capsense_widget_config_t const *ptrWdgtCfg;
if (NULL != context)
{
if ((context->ptrCommonConfig->numWd > widgetId) &&
(context->ptrWdConfig[widgetId].numSns > sensorId))
{
/* Get a pointer to the specified widget configuration structure */
ptrWdgtCfg = &context->ptrWdConfig[widgetId];
/* Get a pointer to the specified sensor context structure */
ptrSnsCxt = &ptrWdgtCfg->ptrSnsContext[sensorId];
/* Check baselines for all frequencies */
for (freqChIndex = 0u; freqChIndex < CY_CAPSENSE_CONFIGURED_FREQ_NUM; freqChIndex++)
{
cxtOffset = sensorId + (freqChIndex * context->ptrCommonConfig->numSns);
bslnInv = (uint16_t)(~(ptrWdgtCfg->ptrBslnInv[cxtOffset]));
if ((ptrSnsCxt->bsln != bslnInv) ||
(ptrSnsCxt->bsln > baselineHighLimit) ||
(ptrSnsCxt->bsln < baselineLowLimit))
{
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_BSLN_INTEGRITY_MASK;
result = CY_CAPSENSE_BIST_FAIL_E;
break;
}
ptrSnsCxt += context->ptrCommonConfig->numSns;
}
if (CY_CAPSENSE_BIST_FAIL_E != result)
{
result = CY_CAPSENSE_BIST_SUCCESS_E;
}
}
}
return result;
}
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_BSLN_INTEGRITY_EN) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_RAW_INTEGRITY_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_CheckIntegritySensorRawcount_V2
****************************************************************************//**
*
* Checks the raw count of the specified widget/sensor is within the specified
* range.
*
* The raw count is within a specific range (based on the calibration target)
* for good units. The function checks whether or not the raw count is within
* the user-defined limits in the ranges function arguments.
* If the raw count is out of limits, this function sets the
* CY_CAPSENSE_BIST_RAW_INTEGRITY_MASK bit in the .testResultMask field of the
* \ref cy_stc_capsense_bist_context_t structure.
*
* This function does not update the CY_CAPSENSE_WD_WORKING_MASK bit of
* the .status field in \ref cy_stc_capsense_widget_context_t structure
* and is not available in the Cy_CapSense_RunSelfTest() function.
*
* Use this function to verify the uniformity of sensors, for example, at
* mass-production or during an operation phase together with the
* Cy_CapSense_CheckIntegritySensorBaseline() function.
*
* \note
* This function is available only for the fourth-generation CAPSENSE™.
*
* \param widgetId
* Specifies the ID number of the widget.
* A macro for the widget ID can be found in the
* CAPSENSE™ Configuration header file (cycfg_capsense.h) defined as
* CY_CAPSENSE_<WidgetName>_WDGT_ID.
*
* \param sensorId
* Specifies the ID number of the sensor within the widget.
* A macro for the sensor ID within the specified widget can be found in
* the CAPSENSE™ Configuration header file (cycfg_capsense.h) defined as
* CY_CAPSENSE_<WidgetName>_SNS<SensorNumber>_ID.
*
* \param rawcountHighLimit
* Specifies the upper limit for the widget/sensor raw count.
*
* \param rawcountLowLimit
* Specifies the lower limit for the widget/sensor raw count.
*
* \param context
* The pointer to the CAPSENSE™ context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns a status of the test execution:
* - CY_CAPSENSE_BIST_SUCCESS_E - The raw count is within the
* specified range.
* - CY_CAPSENSE_BIST_FAIL_E - The test failed and raw count is out
* of the specified limits.
* - CY_CAPSENSE_BIST_BAD_PARAM_E - The input parameter is invalid.
* The test was not executed.
*
*******************************************************************************/
cy_en_capsense_bist_status_t Cy_CapSense_CheckIntegritySensorRawcount_V2(
uint32_t widgetId,
uint32_t sensorId,
uint16_t rawcountHighLimit,
uint16_t rawcountLowLimit,
cy_stc_capsense_context_t * context)
{
cy_en_capsense_bist_status_t result = CY_CAPSENSE_BIST_BAD_PARAM_E;
uint32_t freqChIndex;
const cy_stc_capsense_sensor_context_t *ptrSnsCxt;
cy_stc_capsense_widget_config_t const *ptrWdgtCfg;
if (NULL != context)
{
if ((context->ptrCommonConfig->numWd > widgetId) &&
(context->ptrWdConfig[widgetId].numSns > sensorId))
{
/* Find a pointer to the specified widget configuration structure */
ptrWdgtCfg = &context->ptrWdConfig[widgetId];
/* Find a pointer to the specified sensor context structure */
ptrSnsCxt = &ptrWdgtCfg->ptrSnsContext[sensorId];
/* Check raw counts for all frequencies */
for (freqChIndex = 0u; freqChIndex < CY_CAPSENSE_CONFIGURED_FREQ_NUM; freqChIndex++)
{
if ((ptrSnsCxt->raw > rawcountHighLimit) ||
(ptrSnsCxt->raw < rawcountLowLimit))
{
context->ptrBistContext->testResultMask |= CY_CAPSENSE_BIST_RAW_INTEGRITY_MASK;
result = CY_CAPSENSE_BIST_FAIL_E;
break;
}
ptrSnsCxt += context->ptrCommonConfig->numSns;
}
if (CY_CAPSENSE_BIST_FAIL_E != result)
{
result = CY_CAPSENSE_BIST_SUCCESS_E;
}
}
}
return result;
}
#endif /* (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_RAW_INTEGRITY_EN) */
#if (CY_CAPSENSE_ENABLE == CY_CAPSENSE_TST_SNS_SHORT_EN)
/*******************************************************************************
* Function Name: Cy_CapSense_CheckIntegritySensorPins_V2
****************************************************************************//**
*
* Checks the specified widget/sensor for shorts to GND, VDD or other sensors.
*
* This function performs several sub-tests to verify the specified sensor
* is not electrically shorted and is in a good condition to reliably detect
* user interactions.
*
* This function performs tests to check if the specified sensor is shorted to:
* * GND
* * VDD
* * Other GPIOs used by CAPSENSE™ (such as sensors, Tx, Rx,
* shield electrodes, and external capacitors)
* * Other non-CAPSENSE™ GPIOs (only if they are configured
* in a strong high or low state during the test execution).
*
* The absolute resistance of an electrical short must be less than 1500 Ohm
* including all series resistors on a sensor for a short to be detected
* to GND, VDD or GPIOs. For example, if a series resistor on a sensor is
* 560 Ohm (as recommended) and the sensor is shorted with another sensor,
* the function can detect a short with a short resistance up to 380 Ohm as
* there are two 560 ohm resistors between the shorted sensor GPIOs.
*
* The function executes the following flow to detect a short:
* * Configures all CAPSENSE™ controlled GPIOs to strong-drive-high,
* and the specified sensor GPIO to resistive pull down mode.
* * Waits for a delay (defined by .snsIntgShortSettlingTime field
* of the \ref cy_stc_capsense_bist_context_t structure) to get established
* all transient processes.
* * Checks the status of the specified sensor for the expected state
* (logic low).
* * Configures all CAPSENSE™ controlled GPIOs to strong-drive-low,
* and the specified sensor GPIO to resistive pull up mode.
* * Waits for the above mentioned delay.
* * Checks the status of the specified sensor for the expected state
* (logic high).
* * Stores the test result in the CAPSENSE™ Data Structure.
* A short is reported only when the sensor status check returns
* an unexpected state.
*
* Due to the sensor parasitic capacitance and internal pull-up/down resistance,
* logic high-to-low (and vice versa) transitions require a settling time before
* checking the sensor status. A 2us delay is used as a settling time and can
* be changed using the .snsIntgShortSettlingTime field
* of the cy_stc_capsense_bist_context_t structure.
*
* If a short is detected this function updates the following statuses:
* * The widget ID is stored to the .shortedWdId field
* of the \ref cy_stc_capsense_bist_context_t structure.
* * The sensor ID is stored to the .shortedSnsId field
* of the \ref cy_stc_capsense_bist_context_t structure.
* * The CY_CAPSENSE_BIST_SNS_INTEGRITY_MASK bit is set in the .testResultMask field
* of the \ref cy_stc_capsense_bist_context_t structure.
* * If CY_CAPSENSE_BIST_SNS_INTEGRITY_MASK is already set due to a previously
* detected fault on any of the sensor, this function does not update
* the .shortedWdId and .shortedSnsId fields. For this reason,
* clear the CY_CAPSENSE_BIST_SNS_INTEGRITY_MASK bit prior calling this function.
* * The widget is disabled by clearing the CY_CAPSENSE_WD_WORKING_MASK bit
* in the .status field of the \ref cy_stc_capsense_widget_context_t structure
* of the specified widget.
* The disabled widget is ignored by high-level functions of scanning / data