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cy_capsense_csd_v2.c
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/***************************************************************************//**
* \file cy_capsense_csd_v2.c
* \version 3.0
*
* \brief
* This file defines the data structure global variables and provides
* implementation for the low-level functions of the CSD 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_device_headers.h"
#include "cy_sysclk.h"
#include "cy_syslib.h"
#include "cy_gpio.h"
#include "cy_csd.h"
#include "cy_capsense_common.h"
#include "cy_capsense_structure.h"
#include "cy_capsense_sensing_v2.h"
#include "cy_capsense_csd_v2.h"
#if (defined(CY_IP_MXCSDV2) || defined(CY_IP_M0S8CSDV2))
/*******************************************************************************
* Local definition
*******************************************************************************/
/* CY_ID285392, CY_ID515 */
#define CY_CAPSENSE_FILTER_DELAY_MAX (CY_CAPSENSE_CSD_CONFIG_FILTER_DELAY_4_CYCLES)
#define CY_CAPSENSE_EXTRA_COUNTS_MAX (CY_CAPSENSE_FILTER_DELAY_MAX + 5u + 20u)
#define CY_CAPSENSE_16_BIT_RESOLUTION (16uL)
#define CY_CAPSENSE_CSD_PRECHARGE_MAX_TIME_US (6000u)
#define CY_CAPSENSE_CSD_WATCHDOG_MARGIN_COEFF (3u)
#define CY_CAPSENSE_CSD_PRECHARGE_WATCHDOG_TIME_US (CY_CAPSENSE_CSD_PRECHARGE_MAX_TIME_US *\
CY_CAPSENSE_CSD_WATCHDOG_MARGIN_COEFF)
/*******************************************************************************
* Static Function Prototypes
*******************************************************************************/
/******************************************************************************/
/** \cond SECTION_CAPSENSE_INTERNAL */
/** \addtogroup group_capsense_internal *//** \{ */
/******************************************************************************/
__STATIC_INLINE void Cy_CapSense_CSDChangeClkFreq(uint32_t channelIndex, cy_stc_capsense_context_t * context);
static void Cy_CapSense_CSDInitNextSnsScan(cy_stc_capsense_context_t * context);
static void Cy_CapSense_CSDInitNextChScan(cy_stc_capsense_context_t * context);
static void Cy_CapSense_CSDEnableShieldElectrodes(const cy_stc_capsense_context_t * context);
static void Cy_CapSense_CSDTriggerScan(cy_stc_capsense_context_t * context);
static void Cy_CapSense_CSDCalibrate(uint32_t widgetId, uint32_t target,
cy_stc_capsense_context_t * context);
static uint32_t Cy_CapSense_CSDSwitchIdacGain(cy_stc_capsense_context_t * context);
static void Cy_CapSense_CSDNormalizeIdac(
cy_stc_capsense_widget_config_t const * ptrWdConfig,
uint32_t target,
const cy_stc_capsense_context_t * context);
/** \} \endcond */
/*******************************************************************************
* Function Name: Cy_CapSense_CSDDisableMode
****************************************************************************//**
*
* This function disables CSD mode.
*
* To disable CSD mode the following tasks are performed:
* 1. Disconnect Cmod from AMUXBUS-A.
* 2. Disconnect previous CSX electrode if it has been connected.
* 3. Disconnect Csh from AMUXBUS-B.
* 4. Disable Shield Electrodes.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDDisableMode(cy_stc_capsense_context_t * context)
{
/* Cmod pin to default state */
Cy_CapSense_SsConfigPinRegisters(context->ptrCommonConfig->portCmod, (uint32_t)context->ptrCommonConfig->pinCmod, CY_GPIO_DM_ANALOG, CY_CAPSENSE_HSIOM_SEL_GPIO);
if (0u != context->ptrCommonConfig->csdShieldEn)
{
/* Disconnect shields */
Cy_CapSense_CSDDisableShieldElectrodes(context);
if (0u != context->ptrCommonConfig->csdCTankShieldEn)
{
/* Csh pin to default state */
Cy_CapSense_SsConfigPinRegisters(context->ptrCommonConfig->portCsh, (uint32_t)context->ptrCommonConfig->pinCsh, CY_GPIO_DM_ANALOG, CY_CAPSENSE_HSIOM_SEL_GPIO);
}
}
/* Disconnect IDACA, IDACB and RefGen input */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_REFGEN_SEL, 0u);
/* Disconnect previous CSD sensor if it has been connected */
Cy_CapSense_CSDSnsStateCheck(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDEnableShieldElectrodes
****************************************************************************//**
*
* This internal function initializes Shield Electrodes.
*
* The function sets the bit in the HSIOM register which enables the shield electrode
* functionality on the pin. The port and pin configurations are stored in
* the cy_capsense_shieldIoList structure.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
static void Cy_CapSense_CSDEnableShieldElectrodes(const cy_stc_capsense_context_t * context)
{
uint32_t shieldIndex;
const cy_stc_capsense_pin_config_t * ptrShieldPin = context->ptrShieldPinConfig;
for (shieldIndex = 0u; shieldIndex < context->ptrCommonConfig->csdShieldNumPin; shieldIndex++)
{
Cy_CapSense_SsConfigPinRegisters(ptrShieldPin->pcPtr, (uint32_t)ptrShieldPin->pinNumber, CY_CAPSENSE_CSD_SCAN_PIN_DM, CY_CAPSENSE_HSIOM_SEL_CSD_SHIELD);
ptrShieldPin++;
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDDisableShieldElectrodes
****************************************************************************//**
*
* This internal function disables Shield Electrodes.
*
* The function resets the bit in the HSIOM register which disables the shield
* electrode functionality on the pin. The port and pin configurations are
* stored in the cy_capsense_shieldIoList structure.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDDisableShieldElectrodes(const cy_stc_capsense_context_t * context)
{
uint32_t shieldIndex;
const cy_stc_capsense_pin_config_t * ptrShieldPin = context->ptrShieldPinConfig;
for (shieldIndex = 0u; shieldIndex < context->ptrCommonConfig->csdShieldNumPin; shieldIndex++)
{
Cy_CapSense_SsConfigPinRegisters(ptrShieldPin->pcPtr, (uint32_t)ptrShieldPin->pinNumber, CY_GPIO_DM_STRONG_IN_OFF, CY_CAPSENSE_HSIOM_SEL_GPIO);
Cy_GPIO_Clr(ptrShieldPin->pcPtr, (uint32_t)ptrShieldPin->pinNumber);
ptrShieldPin++;
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDInitialize
****************************************************************************//**
*
* This function initializes the CSD module.
*
* The function performs the following steps:
* 1) Sets GPIO output to "0" for all sensor pins;
* 2) Connects CMOD to AMUXBUS-A and to CSDBUS-A;
* 3) Connects CMOD to (sense path) to CSDCOMP;
* 4) Connects Csh_tank to AMUXBUS-B and to CSDBUS-B;
* 5) Connects VREF to REFGEN;
* 6) Configures REFGEN and sets the reference voltage;
* 7) Connects VREF to CSDCOMP and HSCOMP;
* 8) Configures IDAC and connect to CSDBUS-A (to drive CMOD);
* 9) Configures ModClk;
* 10) Configure SnsClk source;
* 11) Sets other CSD configurations (Csd Auto Zero time,
* Sample Init period, interrupts,
* CMOD and Csh_tank/shield initialization switch resistance).
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDInitialize(cy_stc_capsense_context_t * context)
{
uint32_t interruptState;
cy_stc_capsense_fptr_config_t * ptrFptrCfg = (cy_stc_capsense_fptr_config_t *)context->ptrFptrConfig;
/* Set all the sensors to inactive state */
Cy_CapSense_CSDClearSensors(context);
Cy_CapSense_DischargeExtCapacitors(context);
if (0u != context->ptrCommonConfig->csdShieldEn)
{
/* Connect shields to AMUX-B bus (config HSIOM regs) */
Cy_CapSense_CSDEnableShieldElectrodes(context);
if (0u != context->ptrCommonConfig->csdCTankShieldEn)
{
Cy_CapSense_SsConfigPinRegisters(context->ptrCommonConfig->portCsh, (uint32_t)context->ptrCommonConfig->pinCsh, CY_GPIO_DM_ANALOG, CY_CAPSENSE_HSIOM_SEL_AMUXB);
}
}
/* Initialize the unused CSD IP registers to default state */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_HSCMP, 0u);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SEQ_TIME, 0u);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SENSE_DUTY, CY_CAPSENSE_CSD_SENSE_DUTY_CFG);
#if (CY_CAPSENSE_PSOC6_CSDV2)
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_IO_SEL, context->ptrInternalContext->csdRegIoSel);
#endif
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_INTR_SET, CY_CAPSENSE_DEFAULT_CSD_INTR_SET);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_DSI_SEL, context->ptrInternalContext->csdRegSwDsiSel);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_ADC_CTL, CY_CAPSENSE_DEFAULT_CSD_ADC_CTL);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_SHIELD_SEL, 0u);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_FW_MOD_SEL, 0u);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_FW_TANK_SEL, 0u);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_AMUXBUF_SEL, context->ptrInternalContext->csdRegSwAmuxbufSel);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_HS_P_SEL, context->ptrInternalContext->csdRegSwHsPSelScan);
/* Connection AMUXBUS-A to CSDBUS-A / AMUXBUS-B to CSDBUS-B */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_BYP_SEL, context->ptrInternalContext->csdRegSwBypSel);
/* Connect CMOD to AMUXBUS-A */
interruptState = Cy_SysLib_EnterCriticalSection();
Cy_GPIO_SetDrivemode((GPIO_PRT_Type*)context->ptrCommonConfig->portCmod, (uint32_t)context->ptrCommonConfig->pinCmod, CY_GPIO_DM_ANALOG);
Cy_GPIO_SetHSIOM((GPIO_PRT_Type*)context->ptrCommonConfig->portCmod, (uint32_t)context->ptrCommonConfig->pinCmod, CY_CAPSENSE_HSIOM_SEL_AMUXA);
Cy_SysLib_ExitCriticalSection(interruptState);
/* Select CMOD and Csh_tank/shield initialization switch resistance */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_RES, context->ptrInternalContext->csdRegSwResScan);
/* Set the number of dummy fine initialization cycles */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SEQ_INIT_CNT, (uint32_t)context->ptrCommonConfig->csdFineInitTime);
/* Connect CMOD to (sense path) to CSDCOMP */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_CMP_P_SEL, context->ptrInternalContext->csdRegSwCmpPSel);
/* Configure VREF */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_REFGEN_SEL, context->ptrInternalContext->csdRegSwRefGenSel);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_AMBUF, context->ptrInternalContext->csdRegAmuxbufInit);
/* Connect VREFHI to HSCOMP */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_HS_N_SEL, CY_CAPSENSE_CSD_SW_HS_N_SEL_SW_HCRH_STATIC_CLOSE);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SW_CMP_N_SEL, context->ptrInternalContext->csdRegSwCmpNSel);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_REFGEN, context->ptrInternalContext->csdRegRefgen);
/* Configure IDACs mode */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_IDACA, context->ptrInternalContext->csdIdacAConfig);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_IDACB, context->ptrInternalContext->csdIdacBConfig);
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_CONFIG, context->ptrInternalContext->csdRegConfig);
/* Configure ModClk */
Cy_CapSense_SetClkDivider((uint32_t)context->ptrCommonContext->modCsdClk - 1u, context);
/* Setup ISR handler to single-sensor scan function */
if(NULL != ptrFptrCfg->fptrCSDScanISR)
{
context->ptrActiveScanSns->ptrISRCallback = ptrFptrCfg->fptrCSDScanISR;
}
context->ptrActiveScanSns->mfsChannelIndex = 0u;
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDSnsStateCheck
****************************************************************************//**
*
* Checks if electrodes were previously connected using
* Cy_CapSense_CSDSetupWidgetExt() and if yes disconnects them.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDSnsStateCheck(cy_stc_capsense_context_t * context)
{
if (CY_CAPSENSE_SNS_CONNECTED == context->ptrActiveScanSns->connectedSnsState)
{
Cy_CapSense_CSDDisconnectSnsExt(context);
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDSetUpIdacs
****************************************************************************//**
*
* This function writes both IDACs available in CSD method into corresponding
* the CSD HW block registers.
*
* Modulator IDAC is taken from widget context structure and Compensation
* IDAC is taken from sensor context structure.
* The cy_stc_active_scan_sns_t structure must be updated to the current
* widget/sensor by Cy_CapSense_InitActivePtr() before calling this function.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDSetUpIdacs(cy_stc_capsense_context_t * context)
{
uint32_t regValue;
cy_stc_active_scan_sns_t * ptrActive = context->ptrActiveScanSns;
const uint32_t idacaBitsToWrite = CSD_IDACA_VAL_Msk |
CSD_IDACA_RANGE_Msk |
CSD_IDACA_LEG1_EN_Msk |
CSD_IDACA_LEG2_EN_Msk;
const uint32_t idacbBitsToWrite = CSD_IDACB_VAL_Msk |
CSD_IDACB_RANGE_Msk |
CSD_IDACB_LEG1_EN_Msk |
CSD_IDACB_LEG2_EN_Msk |
CSD_IDACB_LEG3_EN_Msk;
/* IDAC A Code */
if (ptrActive->ptrWdConfig->numCols > ptrActive->sensorIndex)
{
regValue = ptrActive->ptrWdContext->idacMod[ptrActive->mfsChannelIndex];
}
else
{
regValue = ptrActive->ptrWdContext->rowIdacMod[ptrActive->mfsChannelIndex];
}
regValue |= context->ptrCommonConfig->idacGainTable[ptrActive->ptrWdContext->idacGainIndex].gainReg;
Cy_CSD_WriteBits(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_IDACA, idacaBitsToWrite, regValue);
if (CY_CAPSENSE_ENABLE == context->ptrCommonConfig->csdIdacCompEn)
{
/* IDAC B Code */
regValue = ptrActive->ptrSnsContext->idacComp;
regValue |= context->ptrCommonConfig->idacGainTable[ptrActive->ptrWdContext->idacGainIndex].gainReg;
Cy_CSD_WriteBits(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_IDACB, idacbBitsToWrite, regValue);
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDGetNumberOfConversions
****************************************************************************//**
*
* This function calculate number of sub-conversions.
*
* \param snsClkDivider
* The divider value of the sense clock.
*
* \param resolution
* The widget resolution.
*
* \param snsClkSrc
* The widget Sense Clock Source.
*
* \return
* Returns the number of sub-conversions.
*
*******************************************************************************/
uint32_t Cy_CapSense_CSDGetNumberOfConversions(uint32_t snsClkDivider, uint32_t resolution, uint32_t snsClkSrc)
{
/* CY_ID304273 */
uint32_t conversionsNum = 1uL << resolution;
uint32_t extraCounts = 0u;
if (0u == snsClkDivider)
{
snsClkDivider = 1u;
}
if ((CY_CAPSENSE_CLK_SOURCE_PRS8 == snsClkSrc) || (CY_CAPSENSE_CLK_SOURCE_PRS12 == snsClkSrc))
{
snsClkDivider <<= 1u;
}
if(CY_CAPSENSE_16_BIT_RESOLUTION <= resolution)
{
/* CY_ID285392 */
extraCounts = CY_CAPSENSE_EXTRA_COUNTS_MAX;
}
conversionsNum = (conversionsNum - extraCounts) / snsClkDivider;
return((conversionsNum > 0u) ? (conversionsNum) : 1u);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDConfigClock
****************************************************************************//**
*
* This function configure sense clock for different modes.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDConfigClock(cy_stc_capsense_context_t * context)
{
const cy_stc_capsense_widget_context_t * ptrWdCxt = context->ptrActiveScanSns->ptrWdContext;
uint32_t snsClkDivider;
uint32_t snsClkSrc = (uint32_t)ptrWdCxt->snsClkSource & ((uint32_t)~(uint32_t)CY_CAPSENSE_CLK_SOURCE_AUTO_MASK);
uint32_t regValue = 0u;
/* Getting row clock divider for matrix buttons or touchpad widgets */
if (context->ptrActiveScanSns->ptrWdConfig->numCols <= context->ptrActiveScanSns->sensorIndex)
{
snsClkDivider = ptrWdCxt->rowSnsClk;
}
else
{
snsClkDivider = ptrWdCxt->snsClk;
}
/* Configuring PRS SEL_BIT and decreasing divider in case of PRS */
if ((CY_CAPSENSE_CLK_SOURCE_PRS8 == snsClkSrc) || (CY_CAPSENSE_CLK_SOURCE_PRS12 == snsClkSrc))
{
regValue = CY_CAPSENSE_CSD_SENSE_PERIOD_SEL_LFSR_MSB_MSK;
snsClkDivider >>= 1u;
}
/* Check divider value */
if (0u == snsClkDivider)
{
snsClkDivider = 1u;
}
regValue |= ((snsClkSrc << CY_CAPSENSE_CSD_SENSE_PERIOD_LFSR_SIZE_POS) | (snsClkDivider - 1u));
/* Update reg value with divider and configuration */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SENSE_PERIOD, regValue);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDCalculateScanDuration
****************************************************************************//**
*
* Calculates Scan Duration which is defined by scan resolution
*
* The function calculates the number of conversions and updates
* SEQ_NORM_CNT register. The number of conversions depends on resolution and
* snsClk divider.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDCalculateScanDuration(cy_stc_capsense_context_t * context)
{
uint32_t subConv;
cy_stc_capsense_widget_context_t * ptrWdCxt = context->ptrActiveScanSns->ptrWdContext;
uint32_t divider = ptrWdCxt->snsClk;
if (context->ptrActiveScanSns->ptrWdConfig->numCols <= context->ptrActiveScanSns->sensorIndex)
{
divider = ptrWdCxt->rowSnsClk;
}
subConv = Cy_CapSense_CSDGetNumberOfConversions(divider, (uint32_t)ptrWdCxt->resolution,
((uint32_t)ptrWdCxt->snsClkSource & ((uint32_t)~(uint32_t)CY_CAPSENSE_CLK_SOURCE_AUTO_MASK)));
/* Write number of sub-conversions into the CSD HW block register */
Cy_CSD_WriteReg(context->ptrCommonConfig->ptrCsdBase, CY_CSD_REG_OFFSET_SEQ_NORM_CNT, (subConv & CY_CAPSENSE_CSD_SEQ_NORM_CNT_CONV_CNT_MSK));
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDSetupWidget
****************************************************************************//**
*
* Performs the initialization required to scan the specified CSD 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 CSD widget by executing the following tasks:
* 1. Configure the CSD HW block if it is not configured to perform the
* CSD 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_CSDScan()
* 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_CSDSetupWidget(uint32_t widgetId, cy_stc_capsense_context_t * context)
{
/* Setup new scanning mode */
(void)Cy_CapSense_SwitchSensingMode((uint8_t)CY_CAPSENSE_SENSE_METHOD_CSD_E, context);
/* Disconnect previous sensors if they have been connected */
Cy_CapSense_CSDSnsStateCheck(context);
/* Save widget Id to have assess to it after scanning */
Cy_CapSense_InitActivePtr(widgetId, 0u, context);
/* Set up scanning resolution (Number of conversion) */
Cy_CapSense_CSDCalculateScanDuration(context);
Cy_CapSense_CSDConfigClock(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDSetupWidgetExt
****************************************************************************//**
*
* Performs extended initialization required to scan a specified sensor in
* a widget using CSD 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_CSDSetupWidget() and
* also connects and configures specified sensor for scan. Hence this
* function, along with Cy_CapSense_CSDScanExt() function, can be used to
* scan a specific sensor in the widget.
*
* This function should be called for widget that is configured to use
* CSD sensing method, using this function on a non-CSD sensing widget
* would cause unexpected result.
*
* This function requires using the Cy_CapSense_CSDScanExt() function to
* initiate a scan.
*
* Calling this function directly from the application layer 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_CSDSetupWidgetExt(uint32_t widgetId, uint32_t sensorId, cy_stc_capsense_context_t * context)
{
/* Switch Mode if needed */
(void)Cy_CapSense_SwitchSensingMode((uint8_t)CY_CAPSENSE_SENSE_METHOD_CSD_E, context);
/* Disconnect previous sensors if they have been connected */
Cy_CapSense_CSDSnsStateCheck(context);
/* Setup new widget/sensor */
Cy_CapSense_InitActivePtr(widgetId, sensorId, context);
Cy_CapSense_CSDConnectSnsExt(context);
Cy_CapSense_CSDSetUpIdacs(context);
Cy_CapSense_CSDCalculateScanDuration(context);
Cy_CapSense_CSDConfigClock(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDStartSample
****************************************************************************//**
*
* Starts the CSD conversion.
*
* This function assumes that the CSD HW block is already set up using
* the Cy_CapSense_CSDSetupWidget() and the sensor port-pin is connected to the CSD
* block using Cy_CapSense_CSDConnectSns().
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDStartSample(cy_stc_capsense_context_t * context)
{
if(NULL != context->ptrCommonContext->ptrSSCallback)
{
context->ptrCommonContext->ptrSSCallback(context->ptrActiveScanSns);
}
/* Precharging Cmod and Csh */
Cy_CapSense_CSDCmodPrecharge(context);
/* Trigger Scan */
Cy_CapSense_CSDTriggerScan(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDScanExt
****************************************************************************//**
*
* 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_CSDSetupWidgetExt() 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_CSDSetupWidgetExt() 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 needs to be disconnected after the scan,
* Cy_CapSense_CSDDisconnectSns() function can be used.
*
* Calling Cy_CapSense_SetupWidget(), Cy_CapSense_CSDSetupWidget(),
* 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_CSDScanExt(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 Start of sensor scan flag */
Cy_CapSense_SetBusyFlags(context);
/* Set scope flag */
ptrActive->scanScopeSns = CY_CAPSENSE_SCAN_SCOPE_SGL_SNS;
/* Initiate scan */
Cy_CapSense_CSDStartSample(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDScan
****************************************************************************//**
*
* This function initiates a scan for the sensors of the widget initialized
* by the Cy_CapSense_CSDSetupWidget() 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 CSD 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_CSDSetupWidget() function prior
* to calling this function.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDScan(cy_stc_capsense_context_t * context)
{
Cy_CapSense_InitActivePtrSns(0u, context);
/* Setup Idac Value */
Cy_CapSense_CSDSetUpIdacs(context);
Cy_CapSense_CSDConnectSnsExt(context);
/* Set Start of sensor scan flag */
Cy_CapSense_SetBusyFlags(context);
/* Set scope flag */
context->ptrActiveScanSns->scanScopeSns = CY_CAPSENSE_SCAN_SCOPE_ALL_SNS;
/* Initiate scan */
Cy_CapSense_CSDStartSample(context);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDConnectSnsExt
****************************************************************************//**
*
* Connects a ganged sensor port-pin to the CSD HW block via the AMUX bus.
*
* The function gets the IO configuration registers addresses, their shifts and
* masks from the cy_stc_capsense_pin_config_t object. Based on this data, it
* updates the HSIOM and PC registers.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDConnectSnsExt(cy_stc_capsense_context_t * context)
{
cy_stc_active_scan_sns_t * ptrActive = context->ptrActiveScanSns;
const cy_stc_capsense_electrode_config_t * ptrActiveSns = ptrActive->ptrEltdConfig;
const cy_stc_capsense_pin_config_t * ptrActivePin = ptrActiveSns->ptrPin;
uint32_t i;
/* Connect all pins of current sensors */
for(i = 0u; i < ptrActiveSns->numPins; i++)
{
Cy_CapSense_CSDConnectSns(ptrActivePin, context);
ptrActivePin++;
}
ptrActive->connectedSnsState = CY_CAPSENSE_SNS_CONNECTED;
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDDisconnectSnsExt
****************************************************************************//**
*
* Disconnects a ganged sensor port-pin from the CSD HW block and AMUX bus.
* Sets the default state of the un-scanned sensor.
*
* The function gets the IO configuration registers addresses, their shifts and
* masks from the cy_stc_capsense_pin_config_t object. Based on this data and
* the Inactive sensor connection parameter, it updates the HSIOM, PC, and DR registers.
* The HSIOM register is updated only when the Inactive sensor connection parameter
* is set to Shield.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDDisconnectSnsExt(cy_stc_capsense_context_t * context)
{
cy_stc_active_scan_sns_t * ptrActive = context->ptrActiveScanSns;
const cy_stc_capsense_electrode_config_t * ptrActiveSns = ptrActive->ptrEltdConfig;
const cy_stc_capsense_pin_config_t * ptrActivePin = ptrActiveSns->ptrPin;
uint32_t i;
/* Disconnect all pins of current sensors */
for(i = 0u; i < ptrActiveSns->numPins; i++)
{
Cy_CapSense_CSDDisconnectSns(ptrActivePin, context);
ptrActivePin++;
}
ptrActive->connectedSnsState = CY_CAPSENSE_SNS_DISCONNECTED;
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDConnectSns
****************************************************************************//**
*
* Connects port pin 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 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 are 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_CSDConnectSns() function, hence all GPIOs connected
* using this function must be disconnected using
* the Cy_CapSense_CSDDisconnectSns() 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 snsAddrPtr
* Specifies the pointer to the cy_stc_capsense_pin_config_t object belonging to
* a sensor that is to be connected to 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_CSDConnect
*
*******************************************************************************/
void Cy_CapSense_CSDConnectSns(
const cy_stc_capsense_pin_config_t * snsAddrPtr,
const cy_stc_capsense_context_t * context)
{
(void) context;
Cy_CapSense_SsConfigPinRegisters(snsAddrPtr->pcPtr, (uint32_t)snsAddrPtr->pinNumber, CY_CAPSENSE_CSD_SCAN_PIN_DM, CY_CAPSENSE_HSIOM_SEL_CSD_SENSE);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDDisconnectSns
****************************************************************************//**
*
* Disconnects port pin from the CSD HW block by disconnecting it from AMUX bus.
*
* This function can be used to disconnect a sensor connected
* using the Cy_CapSense_CSDConnectSns() function. In addition, this
* function can be used to customize a default sensor connection by
* disconnecting one or more already connected sensors prior to
* initiating a scan of the sensor.
*
* This function works identically to the Cy_CapSense_CSDConnectSns() function
* except it disconnects the specified port pin used by the sensor.
*
* Scanning should be completed before calling this function.
*
* \param snsAddrPtr
* Specifies the pointer to the cy_stc_capsense_pin_config_t object belonging to
* a sensor that should 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_CSDConnect
*
*******************************************************************************/
void Cy_CapSense_CSDDisconnectSns(
const cy_stc_capsense_pin_config_t * snsAddrPtr,
const cy_stc_capsense_context_t * context)
{
Cy_CapSense_SsConfigPinRegisters(snsAddrPtr->pcPtr, (uint32_t)snsAddrPtr->pinNumber,
context->ptrInternalContext->csdInactiveSnsDm,
context->ptrInternalContext->csdInactiveSnsHsiom);
Cy_GPIO_Clr(snsAddrPtr->pcPtr, (uint32_t)snsAddrPtr->pinNumber);
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDClearSensors
****************************************************************************//**
*
* Resets all the CSD sensors to the non-sampling state by sequentially
* disconnecting all the sensors from the Analog MUX bus and putting them to
* an inactive state.
*
* The function goes through all the widgets and updates appropriate bits in
* the IO HSIOM, PC and DR registers depending on the Inactive sensor connection
* parameter. DR register bits are set to zero when the Inactive sensor
* connection is Ground or Hi-Z.
*
* \param context
* The pointer to the CapSense context structure \ref cy_stc_capsense_context_t.
*
*******************************************************************************/
void Cy_CapSense_CSDClearSensors(const cy_stc_capsense_context_t * context)
{
uint32_t wdgtIndex;
uint32_t snsIndex;
uint32_t pinIndex;
const cy_stc_capsense_widget_config_t * ptrWdCfg;
const cy_stc_capsense_electrode_config_t * ptrSnsCfg;
/* Go through all CSD widgets and configure each sensor/pin to the defined state */
for (wdgtIndex = 0u; wdgtIndex < context->ptrCommonConfig->numWd; wdgtIndex++)
{
ptrWdCfg = &context->ptrWdConfig[wdgtIndex];
if ((uint8_t)CY_CAPSENSE_SENSE_METHOD_CSD_E == ptrWdCfg->senseMethod)
{
/* Go through all sensors in widget */
for (snsIndex = 0u; snsIndex < ptrWdCfg->numSns; snsIndex++)
{
ptrSnsCfg = ptrWdCfg->ptrEltdConfig;
/* Go through all pins in sensor */
for(pinIndex = 0u; pinIndex < ptrSnsCfg->numPins; pinIndex++)
{
/* Set CSD pin default state */
Cy_CapSense_CSDDisconnectSns(ptrSnsCfg->ptrPin, context);
}
}
}
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDSetWidgetSenseClkSrc
****************************************************************************//**
*
* Sets a source for the sense clock for a widget.
*
* \param ptrWdConfig
* The pointer to the widget context structure.
*
*******************************************************************************/
void Cy_CapSense_CSDSetWidgetSenseClkSrc(const cy_stc_capsense_widget_config_t * ptrWdConfig)
{
uint32_t lfsrSize;
uint32_t conversionsNum;
uint32_t rowLfsrSize;
uint8_t widgetType = ptrWdConfig->wdType;
cy_stc_capsense_widget_context_t * ptrWdCxt = ptrWdConfig->ptrWdContext;
if (0u != (ptrWdCxt->snsClkSource & CY_CAPSENSE_CLK_SOURCE_AUTO_MASK))
{
conversionsNum = Cy_CapSense_CSDGetNumberOfConversions((uint32_t)ptrWdCxt->snsClk, (uint32_t)ptrWdCxt->resolution, CY_CAPSENSE_CLK_SOURCE_DIRECT);
lfsrSize = Cy_CapSense_SsCalcLfsrSize((uint32_t)ptrWdCxt->snsClk, conversionsNum);
if (CY_CAPSENSE_CLK_SOURCE_DIRECT == lfsrSize)
{
lfsrSize = Cy_CapSense_CSDCalcPrsSize((uint32_t)ptrWdCxt->snsClk << 1uL, (uint32_t)ptrWdCxt->resolution);
}
if (((uint8_t)CY_CAPSENSE_WD_MATRIX_BUTTON_E == widgetType) || ((uint8_t)CY_CAPSENSE_WD_TOUCHPAD_E == widgetType))
{
if (ptrWdCxt->rowSnsClk != ptrWdCxt->snsClk)
{
conversionsNum = Cy_CapSense_CSDGetNumberOfConversions((uint32_t)ptrWdCxt->rowSnsClk, (uint32_t)ptrWdCxt->resolution, CY_CAPSENSE_CLK_SOURCE_DIRECT);
rowLfsrSize = Cy_CapSense_SsCalcLfsrSize((uint32_t)ptrWdCxt->rowSnsClk, conversionsNum);
if (CY_CAPSENSE_CLK_SOURCE_DIRECT == rowLfsrSize)
{
rowLfsrSize = Cy_CapSense_CSDCalcPrsSize((uint32_t)ptrWdCxt->rowSnsClk << 1uL, (uint32_t)ptrWdCxt->resolution);
}
/* Select sense clock source based on both dimensions */
if (rowLfsrSize != lfsrSize)
{
lfsrSize = CY_CAPSENSE_CLK_SOURCE_DIRECT;
}
}
}
ptrWdCxt->snsClkSource = (uint8_t)lfsrSize | CY_CAPSENSE_CLK_SOURCE_AUTO_MASK;
}
}
/*******************************************************************************
* Function Name: Cy_CapSense_CSDCalcPrsSize
****************************************************************************//**
*
* The function finds PRS polynomial size when clock source is set to Auto mode.
*
* The PRS polynomial size in the Auto mode is found based on the following
* requirements:
* - at least one full spread spectrum polynomial should pass during scan time.
*
* \param snsClkDivider
* The divider value for the sense clock.
*
* \param resolution
* The widget resolution.
*
* \return
* Returns the size of PRS value for SENSE_PERIOD register.
*
*******************************************************************************/
uint32_t Cy_CapSense_CSDCalcPrsSize(uint32_t snsClkDivider, uint32_t resolution)
{
uint32_t prsSize;
if ((snsClkDivider * CY_CAPSENSE_PRS_LENGTH_12_BITS) <= ((0x00000001uL << resolution) - 1u))
{