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Copy pathcy_capsense_csx_v2.c
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cy_capsense_csx_v2.c
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/***************************************************************************//**
* \file cy_capsense_csx_v2.c
* \version 3.0
*
* \brief
* This file defines the data structure global variables and provides
* implementation for the low-level functions of the CSX part of
* the Sensing module. The file contains the functions used for the CSD HW block
* initialization, calibration, and scanning.
*
********************************************************************************
* \copyright
* Copyright 2018-2020, 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 "cy_syslib.h"
#include "cy_sysclk.h"
#include "cy_gpio.h"
#include "cy_csd.h"
#include "cy_device_headers.h"
#include "cy_capsense_common.h"
#include "cy_capsense_structure.h"
#include "cy_capsense_csx_v2.h"
#include "cy_capsense_sensing_v2.h"
#if (defined(CY_IP_MXCSDV2) || defined(CY_IP_M0S8CSDV2))
/*******************************************************************************
* Local function declarations
*******************************************************************************/
/******************************************************************************/
/** \cond SECTION_CAPSENSE_INTERNAL */
/** \addtogroup group_capsense_internal *//** \{ */
/******************************************************************************/
static void Cy_CapSense_CSXChangeClkFreq(uint32_t channelIndex, cy_stc_capsense_context_t * context);
static void Cy_CapSense_CSXStartSample(cy_stc_capsense_context_t * context);
static void Cy_CapSense_CSXInitNextChScan(cy_stc_capsense_context_t * context);
static void Cy_CapSense_CSXInitNextScan(cy_stc_capsense_context_t * context);
__STATIC_INLINE void Cy_CapSense_CSXStartSampleExt(cy_stc_capsense_context_t * context);
/** \} \endcond */
/*******************************************************************************
* Function Name: Cy_CapSense_CSXInitialize
****************************************************************************//**
*
* Performs hardware and firmware initialization required for the CSX operation
* of the CapSense middleware.
*
* This function initializes hardware to perform the CSX sensing operation.
* If both CSX and CSD sensing methods are used in the
* middleware, this function is called by the Cy_CapSense_SetupWidget() to
* change hardware configured for CSD sensing method to re-initialize for the
* CSX sensing method.
*
* If the CSD and CSX widgets are used in the middleware, do not
* mix the CSD widgets between the CSX widgets. Instead, place all
* CSX widgets in the required scanning order and then place the CSD widgets
* in the CapSense Configurator tool.
* For the middleware, this action will eliminate the need for changing
* the CSD HW block configuration for every widget scan and will increase the
* execution speed in the Cy_CapSense_ScanAllWidgets() when the function is
* called.
*
* Similarly, set up and scan all the CSX widgets in such
* a sequence that the Cy_CapSense_SetupWidget() does not need to perform
* hardware sensing-configuration switches.
*
* Do not call this function directly from
* the application program.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXInitialize(cy_stc_capsense_context_t * context)
{
uint32_t modClkDivider;
cy_stc_capsense_fptr_config_t * ptrFptrCfg = (cy_stc_capsense_fptr_config_t *)context->ptrFptrConfig;
Cy_CapSense_DischargeExtCapacitors(context);
Cy_CapSense_SsConfigPinRegisters(context->ptrCommonConfig->portCintA, (uint32_t)context->ptrCommonConfig->pinCintA, CY_GPIO_DM_ANALOG, CY_CAPSENSE_CSX_CINT_SCAN_PIN_HSIOM);
Cy_CapSense_SsConfigPinRegisters(context->ptrCommonConfig->portCintB, (uint32_t)context->ptrCommonConfig->pinCintB, CY_GPIO_DM_ANALOG, CY_CAPSENSE_CSX_CINT_SCAN_PIN_HSIOM);
/* Clear all pending interrupts of the CSD HW block */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_INTR, CY_CAPSENSE_CSD_INTR_ALL_MSK);
/* Enable the End Of Scan interrupt */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_INTR_MASK, CY_CAPSENSE_DEFAULT_CSD_INTR_MASK_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_INTR_SET, 0u);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_HSCMP, CY_CAPSENSE_DEFAULT_CSD_HSCMP_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_AMBUF, context->ptrInternalContext->csxRegAMuxBuf);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_REFGEN, context->ptrInternalContext->csxRegRefgen);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_CSDCMP, CY_CAPSENSE_DEFAULT_CSD_CSDCMP_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_IDACA, CY_CAPSENSE_DEFAULT_CSD_IDACA_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_IDACB, CY_CAPSENSE_DEFAULT_CSD_IDACB_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_RES, context->ptrInternalContext->csxRegSwResInit);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SENSE_DUTY, CY_CAPSENSE_DEFAULT_CSD_SENSE_DUTY_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_HS_P_SEL, CY_CAPSENSE_DEFAULT_CSD_SW_HS_P_SEL_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_HS_N_SEL, CY_CAPSENSE_DEFAULT_CSD_SW_HS_N_SEL_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_SHIELD_SEL, CY_CAPSENSE_DEFAULT_CSD_SW_SHIELD_SEL_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_AMUXBUF_SEL, context->ptrInternalContext->csxRegRefgenSel);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_BYP_SEL, CY_CAPSENSE_DEFAULT_CSD_SW_BYP_SEL_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_CMP_P_SEL, CY_CAPSENSE_DEFAULT_CSD_SW_CMP_P_SEL_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_CMP_N_SEL, context->ptrInternalContext->csxRegSwCmpNSel);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_REFGEN_SEL, context->ptrInternalContext->csxRegSwRefGenSel);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_FW_MOD_SEL, CY_CAPSENSE_DEFAULT_CSD_SW_FW_MOD_SEL_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_FW_TANK_SEL, CY_CAPSENSE_DEFAULT_CSD_SW_FW_TANK_SEL_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_DSI_SEL, CY_CAPSENSE_DEFAULT_CSD_SW_DSI_SEL_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SEQ_TIME, 0u);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SEQ_INIT_CNT, (uint32_t)context->ptrCommonConfig->csxFineInitTime);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SEQ_NORM_CNT, CY_CAPSENSE_DEFAULT_CSD_SEQ_NORM_CNT_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_ADC_CTL, CY_CAPSENSE_DEFAULT_CSD_ADC_CTL_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SEQ_START, CY_CAPSENSE_DEFAULT_CSD_SEQ_START_CFG);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_CONFIG, context->ptrInternalContext->csxRegConfigInit);
#if (CY_CAPSENSE_PSOC6_CSDV2)
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_IO_SEL, CY_CAPSENSE_DEFAULT_CSD_SW_IO_SEL_CFG);
#endif
modClkDivider = (uint32_t)context->ptrCommonContext->modCsxClk;
if(0u == modClkDivider)
{
modClkDivider = 1u;
}
Cy_CapSense_SetClkDivider(modClkDivider - 1u, context);
/* Set all IO states to the default state */
Cy_CapSense_SetIOsInDesiredState(CY_GPIO_DM_STRONG_IN_OFF, 0u, CY_CAPSENSE_HSIOM_SEL_GPIO, context);
/* Enable the CSD HW block interrupt and set interrupt vector to CSX sensing method */
if(NULL != ptrFptrCfg->fptrCSXScanISR)
{
context->ptrActiveScanSns->ptrISRCallback = ptrFptrCfg->fptrCSXScanISR;
}
context->ptrActiveScanSns->mfsChannelIndex = 0u;
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXElectrodeCheck
****************************************************************************//**
*
* Check whether electrodes were previously connected using
* the Cy_CapSense_CSXSetupWidgetExt() function and if yes, disconnect them.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXElectrodeCheck(cy_stc_capsense_context_t * context)
{
if (CY_CAPSENSE_SNS_CONNECTED == context->ptrActiveScanSns->connectedSnsState)
{
/* Disconnect all Tx pins */
Cy_CapSense_CSXDisconnectTxExt(context);
/* Disconnect all Rx pins */
Cy_CapSense_CSXDisconnectRxExt(context);
/* Mark the current sensor as disconnected */
context->ptrActiveScanSns->connectedSnsState = CY_CAPSENSE_SNS_DISCONNECTED;
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXDisableMode
****************************************************************************//**
*
* This function disables CSX mode.
*
* To disable CSX mode, the following tasks are performed:
* 1. Disconnect previous CSX electrode if it has been connected.
* 2. Disconnect the external capacitors (CintA and CintB).
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXDisableMode(cy_stc_capsense_context_t * context)
{
/* Disconnect previous CSX electrode if it has been connected */
Cy_CapSense_CSXElectrodeCheck(context);
/* Disconnect the external capacitors (CintA and CintB) */
Cy_CapSense_SsConfigPinRegisters(context->ptrCommonConfig->portCintA, (uint32_t)context->ptrCommonConfig->pinCintA, CY_GPIO_DM_ANALOG, HSIOM_SEL_GPIO);
Cy_CapSense_SsConfigPinRegisters(context->ptrCommonConfig->portCintB, (uint32_t)context->ptrCommonConfig->pinCintB, CY_GPIO_DM_ANALOG, HSIOM_SEL_GPIO);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXSetupWidget
****************************************************************************//**
*
* Performs the initialization required to scan the specified CSX widget.
*
* \note This function is obsolete and kept for backward compatibility only.
* The Cy_CapSense_SetupWidget() function should be used instead.
*
* This function prepares the middleware to scan all the sensors in the
* specified CSX widget by executing the following tasks:
* 1. Configure the CSD HW block if it is not configured to perform the
* CSX sensing method used by the specified widget.
* 2. Initialize the CSD HW block with specific sensing configuration (e.g.
* sensor clock, scan resolution) used by the widget.
* 3. Disconnect all previously connected electrodes, if the electrodes
* connected by the Cy_CapSense_CSDSetupWidgetExt(),
* Cy_CapSense_CSXSetupWidgetExt() functions are not disconnected.
*
* This function does not start sensor scanning. The Cy_CapSense_CSXScan()
* function must be called to start the scan sensors in the widget. If this
* function is called more than once, it does not break the middleware
* operation, but only the last initialized widget is in effect.
* Calling this function directly from the application program is not
* recommended. This function is used to implement only the user's specific
* use cases (for example faster execution).
*
* The status of a sensor scan must be checked using the Cy_CapSense_IsBusy()
* function prior to starting a next scan or setting up another widget.
*
* \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.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXSetupWidget(uint32_t widgetId, cy_stc_capsense_context_t * context)
{
/* variable to access widget details */
uint32_t snsClkDivider;
uint32_t snsClkSrc;
uint32_t tmpRegVal;
(void)Cy_CapSense_SwitchSensingMode((uint8_t)CY_CAPSENSE_SENSE_METHOD_CSX_E, context);
/*
* Check whether CSX electrodes were previously connected using
* Cy_CapSense_CSXSetupWidgetExt and if yes, disconnect them
*/
Cy_CapSense_CSXElectrodeCheck(context);
/* Set up widget and its first sensor IDs and pointers to have assess to them after scanning */
Cy_CapSense_InitActivePtr(widgetId, 0u, context);
/* Number of conversion and maxRawCount setup */
tmpRegVal = (uint32_t)context->ptrActiveScanSns->ptrWdContext->resolution;
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SEQ_NORM_CNT, tmpRegVal);
context->ptrActiveScanSns->ptrWdContext->maxRawCount = (uint16_t)tmpRegVal *
(context->ptrActiveScanSns->ptrWdContext->snsClk - CY_CAPSENSE_CSX_DEADBAND_CYCLES_NUMBER);
/* SnsClk setup */
snsClkDivider = (uint32_t) context->ptrActiveScanSns->ptrWdContext->snsClk;
/* Check divider value */
if (0u == snsClkDivider)
{
snsClkDivider = 1u;
}
snsClkSrc = (uint32_t)context->ptrActiveScanSns->ptrWdContext->snsClkSource & (uint32_t)~((uint32_t)CY_CAPSENSE_CLK_SOURCE_AUTO_MASK);
tmpRegVal = ((snsClkSrc << CY_CAPSENSE_CSD_SENSE_PERIOD_LFSR_SIZE_POS) | (snsClkDivider - 1u) |
CY_CAPSENSE_CSD_SENSE_PERIOD_LFSR_CLEAR_MSK | CY_CAPSENSE_CSD_SENSE_PERIOD_LFSR_BITS_MSK);
/* Update reg value with divider and configuration */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SENSE_PERIOD, tmpRegVal);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXSetupWidgetExt
****************************************************************************//**
*
* Performs extended initialization required to scan a specified sensor in
* a widget using CSX sensing method.
*
* \note This function is obsolete and kept for backward compatibility only.
* The Cy_CapSense_SetupWidgetExt() function should be used instead.
*
* This function performs the same tasks of Cy_CapSense_CSXSetupWidget() and
* also connects and configures specified sensor for scan. Hence this
* function, along with Cy_CapSense_CSXScanExt() function, can be used to
* scan a specific sensor in the widget.
*
* This function should be called for a widget that is configured to use
* CSX sensing method. Using this function on a non-CSX sensing widget
* would cause an unexpected result.
*
* This function requires using the Cy_CapSense_CSXScanExt() function to
* initiate a scan.
*
* Calling this function directly from the application program is not
* recommended. This function is used to implement only the user's
* specific use cases (for example faster execution).
*
* \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.
*
* \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.
*
*******************************************************************************/
void Cy_CapSense_CSXSetupWidgetExt(
uint32_t widgetId,
uint32_t sensorId,
cy_stc_capsense_context_t * context)
{
/* Initialize widget */
Cy_CapSense_CSXSetupWidget_Call(widgetId, context);
/* Initialize sensor data structure pointer to appropriate address */
Cy_CapSense_InitActivePtrSns(sensorId, context);
/*
* Connect current sensor's Tx and Rx IOs for scan and set flag
* to indicate that IOs should be disconnected
*/
Cy_CapSense_CSXConnectTxExt(context);
Cy_CapSense_CSXConnectRxExt(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXScan
****************************************************************************//**
*
* This function initiates a scan for the sensors of the widget initialized
* by the Cy_CapSense_CSXSetupWidget() function.
*
* \note This function is obsolete and kept for backward compatibility only.
* The Cy_CapSense_Scan() function should be used instead.
*
* This function does the following tasks:
* 1. Connects the first sensor of the widget.
* 2. Configures the IDAC value.
* 3. Starts scanning for the first sensor in the widget.
*
* This function is called by the Cy_CapSense_Scan() if the given
* widget uses the CSX sensing method.
*
* Calling this function directly from the application program is not
* recommended. This function is used to implement only the user's specific
* use cases (for example faster execution).
*
* This function is called when no scanning is in progress. I.e.
* Cy_CapSense_IsBusy() returns a non-busy status and the widget must be
* preconfigured using the Cy_CapSense_CSXSetupWidget() function prior
* to calling this function.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXScan(cy_stc_capsense_context_t * context)
{
Cy_CapSense_InitActivePtrSns(0u, context);
/* Connect electrodes */
Cy_CapSense_CSXConnectTxExt(context);
Cy_CapSense_CSXConnectRxExt(context);
/* Set Start of scan flag */
Cy_CapSense_SetBusyFlags(context);
/* Set scope flag */
context->ptrActiveScanSns->scanScopeSns = CY_CAPSENSE_SCAN_SCOPE_ALL_SNS;
Cy_CapSense_CSXStartSample(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXScanExt()
****************************************************************************//**
*
* Starts the CSD conversion on the preconfigured sensor.
*
* \note This function is obsolete and kept for backward compatibility only.
* The Cy_CapSense_ScanExt() function should be used instead.
*
* This function performs scanning of a specific sensor in the widget
* previously initialized using the Cy_CapSense_CSXSetupWidgetExt() function.
*
* This function is called when no scanning is in progress.
* I.e. Cy_CapSense_IsBusy() returns a non-busy status and the widget must
* be preconfigured using Cy_CapSense_CSXSetupWidgetExt() function prior
* to calling this function. Calling this function directly from
* the application program is not recommended. This function is used to
* implement only the user's specific use cases (for example faster execution).
*
* This function does not disconnect sensor GPIOs from CSD HW block at the
* end of a scan, therefore making subsequent scan of the same sensor is faster.
* If sensor must be disconnected after the scan,
* the Cy_CapSense_CSXDisconnectTx() or Cy_CapSense_CSXDisconnectRx() functions
* can be used.
*
* Calling Cy_CapSense_SetupWidget(), Cy_CapSense_CSXSetupWidget(),
* Cy_CapSense_ScanAllWidgets(), or if Cy_CapSense_RunTuner() returns
* CY_CAPSENSE_STATUS_RESTART_DONE status invalidated initialization
* made by this function.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXScanExt(cy_stc_capsense_context_t * context)
{
cy_stc_active_scan_sns_t * ptrActive = context->ptrActiveScanSns;
/* Set MFS channel index to 0 */
ptrActive->mfsChannelIndex = 0u;
/* Initialize the Active Context pointer with the CH0 context */
ptrActive->ptrSnsContext = &ptrActive->ptrWdConfig->ptrSnsContext[ptrActive->sensorIndex];
/* Set busy flag and start conversion */
Cy_CapSense_SetBusyFlags(context);
/* Set scope flag */
context->ptrActiveScanSns->scanScopeSns = CY_CAPSENSE_SCAN_SCOPE_SGL_SNS;
Cy_CapSense_CSXStartSample(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXCalibrateWidget
****************************************************************************//**
*
* Executes the IDAC calibration for all the sensors in the widget specified in
* the input.
*
* \note This function is obsolete and kept for backward compatibility only.
* The Cy_CapSense_CalibrateWidget() function should be used instead.
*
* Performs a successive approximation search algorithm to find appropriate
* IDAC values for all sensors in the specified widget that provide
* the raw count to the level specified by the target parameter.
*
* Calibration returns CY_CAPSENSE_STATUS_BAD_DATA if the achieved raw count is outside
* of the range specified by the target and acceptable calibration deviation
* parameters.
*
* This function could be used when the CSX Enable IDAC auto-calibration
* parameter is enabled.
*
* \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.
*
* \param target
* Specifies the calibration target in percentages of the maximum raw count.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
* \return
* Returns the status of the specified widget calibration:
* - 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 calibration failed and CapSense may not operate
* as expected.
* - CY_CAPSENSE_STATUS_INVALID_STATE - The previous scanning is not completed, and
* the CapSense middleware is busy.
*
*******************************************************************************/
cy_capsense_status_t Cy_CapSense_CSXCalibrateWidget(
uint32_t widgetId,
uint32_t target,
cy_stc_capsense_context_t * context)
{
uint32_t cpuFreqMHz;
uint32_t watchdogCounter;
uint32_t freqChIndex;
uint32_t freqChNumber;
cy_capsense_status_t calibrateStatus = CY_CAPSENSE_STATUS_SUCCESS;
const cy_stc_capsense_widget_config_t * ptrWdCfg;
cy_stc_capsense_sensor_context_t * ptrActSnsContext;
uint32_t rawTarget;
uint32_t totalSns;
uint32_t modClkDivider;
uint32_t snsClkDivider;
uint32_t calibrationIndex;
/* Currently used IDAC-bit */
uint8_t curIdacMask = CY_CAPSENSE_CAL_MIDDLE_VALUE;
/* Next used IDAC-bit */
uint8_t nextIdacMask = ((uint8_t)CY_CAPSENSE_CAL_MIDDLE_VALUE) >> 1u;
/* Approximate duration of Wait For Init loop */
const uint32_t isBusyLoopDuration = 5u;
/* Wait For Init watchdog timeout in microseconds */
uint64_t isBusyWatchdogTimeUs = 0u;
if((context->ptrCommonConfig->numWd <= widgetId) ||
(CY_CAPSENSE_DISABLE == context->ptrCommonConfig->csxIdacAutocalEn))
{
calibrateStatus = CY_CAPSENSE_STATUS_BAD_PARAM;
}
if((uint8_t)CY_CAPSENSE_SENSE_METHOD_CSX_E != context->ptrWdConfig[widgetId].senseMethod)
{
calibrateStatus = CY_CAPSENSE_STATUS_BAD_PARAM;
}
if(CY_CAPSENSE_BUSY == (context->ptrCommonContext->status & CY_CAPSENSE_BUSY))
{
/* Previous widget is being scanned, return error */
calibrateStatus = CY_CAPSENSE_STATUS_INVALID_STATE;
}
if(CY_CAPSENSE_STATUS_SUCCESS == calibrateStatus)
{
ptrWdCfg = &context->ptrWdConfig[widgetId];
ptrWdCfg->ptrWdContext->idacGainIndex = context->ptrCommonConfig->csxIdacGainInitIndex;
ptrActSnsContext = ptrWdCfg->ptrSnsContext;
totalSns = ptrWdCfg->numSns;
/* Calculate target raw count */
rawTarget = ((uint32_t)context->ptrWdContext[widgetId].maxRawCount * target) / CY_CAPSENSE_PERCENTAGE_100;
freqChNumber = (CY_CAPSENSE_ENABLE == context->ptrCommonConfig->mfsEn) ? 3u : 1u;
for(freqChIndex = 0u; freqChIndex < freqChNumber; freqChIndex++)
{
/* Clear raw count registers and IDAC registers of all the sensors/nodes */
for (calibrationIndex = 0u; calibrationIndex < totalSns; calibrationIndex++)
{
ptrActSnsContext[calibrationIndex + (freqChIndex * context->ptrCommonConfig->numSns)].raw = 0u;
ptrActSnsContext[calibrationIndex + (freqChIndex * context->ptrCommonConfig->numSns)].idacComp = curIdacMask;
}
}
modClkDivider = (uint32_t)context->ptrCommonContext->modCsxClk;
snsClkDivider = (uint32_t)ptrWdCfg->ptrWdContext->snsClk;
if(0u == modClkDivider)
{
modClkDivider = 1u;
}
if(0u == snsClkDivider)
{
snsClkDivider = 1u;
}
if(CY_CAPSENSE_ENABLE == context->ptrCommonConfig->mfsEn)
{
if(context->ptrCommonConfig->csxMfsDividerOffsetF1 >
context->ptrCommonConfig->csxMfsDividerOffsetF2)
{
snsClkDivider += context->ptrCommonConfig->csxMfsDividerOffsetF1;
}
else
{
snsClkDivider += context->ptrCommonConfig->csxMfsDividerOffsetF2;
}
}
isBusyWatchdogTimeUs = (uint64_t)totalSns * freqChNumber * ptrWdCfg->ptrWdContext->resolution;
isBusyWatchdogTimeUs *= (uint64_t)snsClkDivider * modClkDivider * CY_CAPSENSE_CONVERSION_MEGA;
isBusyWatchdogTimeUs /= context->ptrCommonConfig->periClkHz;
if(0uL == isBusyWatchdogTimeUs)
{
isBusyWatchdogTimeUs = 1u;
}
isBusyWatchdogTimeUs *= CY_CAPSENSE_CSX_WATCHDOG_MARGIN_COEFF;
/* Perform binary search for accurate IDAC value for each sensor/node */
do
{
/* Scan all the sensors/nodes in widget */
(void)Cy_CapSense_SetupWidget(widgetId, context);
(void)Cy_CapSense_Scan(context);
cpuFreqMHz = context->ptrCommonConfig->cpuClkHz / CY_CAPSENSE_CONVERSION_MEGA;
watchdogCounter = Cy_CapSense_WatchdogCyclesNum((uint32_t)isBusyWatchdogTimeUs, cpuFreqMHz, isBusyLoopDuration);
/* Wait for EOS */
while (CY_CAPSENSE_BUSY == (context->ptrCommonContext->status & CY_CAPSENSE_BUSY))
{
if(0uL == watchdogCounter)
{
break;
}
watchdogCounter--;
}
/* Set pointer to the widget's first sensor data */
ptrActSnsContext = ptrWdCfg->ptrSnsContext;
for (freqChIndex = 0u; freqChIndex < freqChNumber; freqChIndex++)
{
/* Check raw count and adjust IDAC, loop through all the sensors/nodes */
for (calibrationIndex = 0u; calibrationIndex < totalSns; calibrationIndex++)
{
/* Check whether the current raw count is above target.
* If yes, clear the MS bit of bit.
* If no, keep the MS bit and set next bit.
*/
if (ptrActSnsContext[calibrationIndex + (freqChIndex * context->ptrCommonConfig->numSns)].raw > rawTarget)
{
ptrActSnsContext[calibrationIndex + (freqChIndex * context->ptrCommonConfig->numSns)].idacComp &= (uint8_t)(~curIdacMask);
}
ptrActSnsContext[calibrationIndex + (freqChIndex * context->ptrCommonConfig->numSns)].idacComp |= nextIdacMask;
}
}
/* Shift both current IDAC and pre IDAC values to the right by 1 */
curIdacMask = nextIdacMask;
nextIdacMask = nextIdacMask >> 1u;
}
while (curIdacMask != 0u);
calibrateStatus = CY_CAPSENSE_STATUS_SUCCESS;
}
if(CY_CAPSENSE_STATUS_SUCCESS == calibrateStatus)
{
/* Perform specified widget scan to check calibration result */
/* Scan all the sensors/nodes in widget */
(void)Cy_CapSense_SetupWidget(widgetId, context);
(void)Cy_CapSense_Scan(context);
cpuFreqMHz = context->ptrCommonConfig->cpuClkHz / CY_CAPSENSE_CONVERSION_MEGA;
watchdogCounter = Cy_CapSense_WatchdogCyclesNum((uint32_t)isBusyWatchdogTimeUs, cpuFreqMHz, isBusyLoopDuration);
/* Wait for EOS */
while (CY_CAPSENSE_BUSY == (context->ptrCommonContext->status & CY_CAPSENSE_BUSY))
{
if(0uL == watchdogCounter)
{
calibrateStatus = CY_CAPSENSE_STATUS_TIMEOUT;
break;
}
watchdogCounter--;
}
if(CY_CAPSENSE_STATUS_SUCCESS == calibrateStatus)
{
calibrateStatus = Cy_CapSense_CalibrateCheck(widgetId, target, (uint32_t)CY_CAPSENSE_SENSE_METHOD_CSX_E, context);
}
}
return(calibrateStatus);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXSetUpIdacs
****************************************************************************//**
*
* Configures IDAC for the CSX sensing method.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXSetUpIdacs(cy_stc_capsense_context_t * context)
{
uint32_t tmpRegVal;
/* Set IDAC gain */
tmpRegVal = context->ptrCommonConfig->idacGainTable[context->ptrActiveScanSns->ptrWdContext->idacGainIndex].gainReg;
/* Set IDAC code */
tmpRegVal |= (uint32_t)context->ptrActiveScanSns->ptrSnsContext->idacComp & CY_CAPSENSE_CSD_IDACA_VAL_MSK;
tmpRegVal |= CY_CAPSENSE_DEFAULT_CSD_IDACA_CFG;
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_IDACA, tmpRegVal);
}
/*******************************************************************************
* Function Name: Cy_CapSense_SsCSXStartSample
****************************************************************************//**
*
* Starts scanning for the CSX widget.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
static void Cy_CapSense_CSXStartSample(cy_stc_capsense_context_t * context)
{
/* Set up IDAC Value */
Cy_CapSense_CSXSetUpIdacs(context);
/* Clear previous interrupts */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_INTR, CY_CAPSENSE_CSD_INTR_ALL_MSK);
(void)Cy_CSD_ReadReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_INTR);
/* Enable interrupt */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_INTR_MASK, CY_CAPSENSE_CSD_INTR_MASK_SAMPLE_MSK);
if(NULL != context->ptrCommonContext->ptrSSCallback)
{
context->ptrCommonContext->ptrSSCallback(context->ptrActiveScanSns);
}
Cy_CapSense_CSXStartSampleExt(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXConnectRx
****************************************************************************//**
*
* Connects port pin (an Rx electrode) to the CSD HW block using AMUX bus.
*
* This function can be used to customize the default sensor connection
* by connecting one or more pins to an existing sensor as an Rx electrode
* prior to initiating scan of the sensor.
*
* The function ignores whether the sensor is a ganged sensor and
* connects only a specified port pin to the CSD HW block. This function can
* only use GPIOs that is already assigned to CapSense middleware.
*
* The functions that perform a setup and scan of a sensor/widget do not
* take into account changes in the design made by
* the Cy_CapSense_CSXConnectRx() function. Hence all GPIOs connected
* using this function must be disconnected using
* the Cy_CapSense_CSXDisconnectRx() function prior to initializing
* new widgets. Use this function in StartSample
* callback (see the \ref group_capsense_callbacks section for details)
* or with low-level functions that perform a single-sensor scanning.
*
* Scanning should be completed before calling this function.
*
* \param rxPtr
* Specifies the pointer to the cy_stc_capsense_pin_config_t object belonging to
* a sensor which to be connected to the CSD HW block as an Rx electrode.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
* \funcusage
*
* An example of using the function to perform port pin re-connection:
* \snippet capsense/snippet/main.c snippet_Cy_CapSense_CSXConnect
*
*******************************************************************************/
void Cy_CapSense_CSXConnectRx(
const cy_stc_capsense_pin_config_t * rxPtr,
const cy_stc_capsense_context_t * context)
{
(void) context;
Cy_CapSense_SsConfigPinRegisters(rxPtr->pcPtr, (uint32_t)rxPtr->pinNumber, CY_GPIO_DM_ANALOG, CY_CAPSENSE_HSIOM_SEL_AMUXA);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXConnectTx
****************************************************************************//**
*
* Connects port pin (a Tx electrode) to the CSD HW block.
*
* This function can be used to customize the default sensor connection
* by connecting one or more pins to an existing sensor as a Tx electrode
* prior to initiating scan of the sensor.
*
* The function ignores whether the sensor is a ganged sensor and
* connects only a specified port pin to the CSD HW block. This function can
* only use GPIOs that is already assigned to CapSense middleware.
*
* The functions that perform a setup and scan of a sensor/widget do not
* take into account changes in the design made by
* the Cy_CapSense_CSXConnectTx() function. Hence all GPIOs connected
* using this function must be disconnected using
* the Cy_CapSense_CSXDisconnectTx() function prior to initializing
* new widgets. Use this function in StartSample
* callback (see the \ref group_capsense_callbacks section for details)
* or with low-level functions that perform a single-sensor scanning.
*
* Scanning should be completed before calling this function.
*
* \param txPtr
* Specifies the pointer to the cy_stc_capsense_pin_config_t object belonging to
* a sensor which to be connected to the CSD HW block as a Tx electrode.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
* \funcusage
*
* An example of using the function to perform port pin re-connection:
* \snippet capsense/snippet/main.c snippet_Cy_CapSense_CSXConnect
*
*******************************************************************************/
void Cy_CapSense_CSXConnectTx(
const cy_stc_capsense_pin_config_t * txPtr,
const cy_stc_capsense_context_t * context)
{
(void) context;
Cy_CapSense_SsConfigPinRegisters(txPtr->pcPtr, (uint32_t)txPtr->pinNumber, CY_GPIO_DM_STRONG_IN_OFF, CY_CAPSENSE_CSX_TX_SCAN_PIN_HSIOM);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXDisconnectRx
****************************************************************************//**
*
* Disconnects port pin (an Rx electrode) from the CSD HW block by disconnecting
* it from the AMUX bus.
*
* This function can be used to disconnect a sensor connected
* using the Cy_CapSense_CSXConnectRx() function. In addition, this
* function can be used to customize default sensor connection by
* disconnecting one or more already connected sensors prior to
* initiating scan of the sensor.
*
* This function works identically to the Cy_CapSense_CSDConnectRx() function
* except it disconnects the specified port pin used by the sensor.
*
* Scanning should be completed before calling this function.
*
* \param rxPtr
* Specifies the pointer to the cy_stc_capsense_pin_config_t object belonging
* to an Rx pin sensor to be disconnected from the CSD HW block.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
* \funcusage
*
* An example of using the function to perform port pin re-connection:
* \snippet capsense/snippet/main.c snippet_Cy_CapSense_CSXConnect
*
*******************************************************************************/
void Cy_CapSense_CSXDisconnectRx(
const cy_stc_capsense_pin_config_t * rxPtr,
const cy_stc_capsense_context_t * context)
{
(void) context;
Cy_CapSense_SsConfigPinRegisters(rxPtr->pcPtr, (uint32_t)rxPtr->pinNumber, CY_GPIO_DM_STRONG_IN_OFF, CY_CAPSENSE_HSIOM_SEL_GPIO);
Cy_GPIO_Clr(rxPtr->pcPtr, (uint32_t)rxPtr->pinNumber);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXDisconnectTx
****************************************************************************//**
*
* Disconnects port pin (a Tx electrode) from the CSD HW block.
*
* This function can be used to disconnect a sensor connected
* using the Cy_CapSense_CSXConnectTx() function. In addition, this
* function can be used to customize default sensor connection by
* disconnecting one or more already connected sensors prior to
* initiating scan of the sensor.
*
* This function works identically to the Cy_CapSense_CSDConnectTx() function
* except it disconnects the specified port pin used by the sensor.
*
* Scanning should be completed before calling this function.
*
* \param txPtr
* Specifies the pointer to the cy_stc_capsense_pin_config_t object belonging
* to a Tx pin sensor to be disconnected from the CSD HW block.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
* \funcusage
*
* An example of using the function to perform port pin re-connection:
* \snippet capsense/snippet/main.c snippet_Cy_CapSense_CSXConnect
*
*******************************************************************************/
void Cy_CapSense_CSXDisconnectTx(
const cy_stc_capsense_pin_config_t * txPtr,
const cy_stc_capsense_context_t * context)
{
(void) context;
Cy_CapSense_SsConfigPinRegisters(txPtr->pcPtr, (uint32_t)txPtr->pinNumber, CY_GPIO_DM_STRONG_IN_OFF, CY_CAPSENSE_HSIOM_SEL_GPIO);
Cy_GPIO_Clr(txPtr->pcPtr, (uint32_t)txPtr->pinNumber);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXConnectTxExt
****************************************************************************//**
*
* Connects a current Tx electrode to the CSX scanning hardware.
*
* This function connects all current Tx electrode's pins to the CSD_SENSE signal.
* It is assumed that drive mode of the port pin is already set to STRONG
* in the HSIOM_PORT_SELx register.
*
* Calling this function directly from the application program is not
* recommended. This function is used to implement only the user's specific
* use cases (for faster execution time when there is only one port pin for an
* electrode for example).
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXConnectTxExt(cy_stc_capsense_context_t * context)
{
uint32_t pinIndex;
const cy_stc_capsense_pin_config_t * pinPointer = context->ptrActiveScanSns->ptrTxConfig->ptrPin;
for (pinIndex = context->ptrActiveScanSns->ptrTxConfig->numPins; pinIndex-- > 0u;)
{
Cy_CapSense_CSXConnectTx(pinPointer, context);
pinPointer++;
}
context->ptrActiveScanSns->connectedSnsState = CY_CAPSENSE_SNS_CONNECTED;
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXConnectRxExt
****************************************************************************//**
*
* Connects a current Rx electrode to the CSX scanning hardware.
*
* This function connects all current Rx electrode's pins to the CSD_SENSE signal.
* It is assumed that drive mode of the port pin is already set to STRONG
* in the HSIOM_PORT_SELx register.
*
* Calling this function directly from the application program is not
* recommended. This function is used to implement only the user's specific
* use cases (for faster execution time when there is only one port pin for an
* electrode for example).
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXConnectRxExt(cy_stc_capsense_context_t * context)
{
uint32_t pinIndex;
const cy_stc_capsense_pin_config_t * pinPointer = context->ptrActiveScanSns->ptrRxConfig->ptrPin;
for (pinIndex = context->ptrActiveScanSns->ptrRxConfig->numPins; pinIndex-- > 0u;)
{
Cy_CapSense_CSXConnectRx(pinPointer, context);
pinPointer++;
}
context->ptrActiveScanSns->connectedSnsState = CY_CAPSENSE_SNS_CONNECTED;
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXDisconnectTxExt
****************************************************************************//**
*
* Disconnects a current Tx electrode from the CSX scanning hardware.
*
* This function connects all current Tx electrode's pins to the CSD_SENSE signal.
* It is assumed that drive mode of the port pin is already set to STRONG
* in the HSIOM_PORT_SELx register.
*
* Calling this function directly from the application program is not
* recommended. This function is used to implement only the user's specific
* use cases (for faster execution time when there is only one port pin for an
* electrode for example).
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSXDisconnectTxExt(const cy_stc_capsense_context_t * context)
{
uint32_t pinIndex;
const cy_stc_capsense_pin_config_t * pinPointer = context->ptrActiveScanSns->ptrTxConfig->ptrPin;
for (pinIndex = context->ptrActiveScanSns->ptrTxConfig->numPins; pinIndex-- > 0u;)
{
Cy_CapSense_CSXDisconnectTx(pinPointer, context);
pinPointer++;
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSXDisconnectRxExt
****************************************************************************//**
*
* Connects a current Tx electrode to the CSX scanning hardware.
*
* This function connects all current Tx electrode's pins to the CSD_SENSE signal.
* It is assumed that drive mode of the port pin is already set to STRONG