Functions
fsp_err_t	RM_TOUCH_Open (touch_ctrl_t const p_ctrl, touch_cfg_t const const p_cfg)
	Opens and configures the TOUCH Middle module. Implements touch_api_t::open. More...

fsp_err_t	RM_TOUCH_ScanStart (touch_ctrl_t *const p_ctrl)
	This function should be called each time a periodic timer expires. If initial offset tuning is enabled, The first several calls are used to tuning for the sensors. Before starting the next scan, first get the data with RM_TOUCH_DataGet(). If a different control block scan should be run, check the scan is complete before executing. Implements touch_api_t::scanStart. More...

fsp_err_t	RM_TOUCH_DataGet (touch_ctrl_t const p_ctrl, uint64_t p_button_status, uint16_t p_slider_position, uint16_t p_wheel_position)
	Gets the 64-bit mask indicating which buttons are pressed. Also, this function gets the current position of where slider or wheel is being pressed. If initial offset tuning is enabled, The first several calls are used to tuning for the sensors. Implements touch_api_t::dataGet. More...

fsp_err_t	RM_TOUCH_PadDataGet (touch_ctrl_t const p_ctrl, uint16_t p_pad_rx_coordinate, uint16_t p_pad_tx_coordinate, uint8_t p_pad_num_touch)
	This function gets the current position of pad is being pressed. Implements touch_api_t::padDataGet , g_touch_on_ctsu. More...

fsp_err_t	RM_TOUCH_ScanStop (touch_ctrl_t *const p_ctrl)
	Scan stop specified TOUCH control block. Implements touch_api_t::scanStop. More...

fsp_err_t	RM_TOUCH_CallbackSet (touch_ctrl_t const p_api_ctrl, void(p_callback)(touch_callback_args_t ), void const const p_context, touch_callback_args_t *const p_callback_memory)

fsp_err_t	RM_TOUCH_Close (touch_ctrl_t *const p_ctrl)
	Disables specified TOUCH control block. Implements touch_api_t::close. More...

fsp_err_t	RM_TOUCH_SensitivityRatioGet (touch_ctrl_t const p_ctrl, touch_sensitivity_info_t p_touch_sensitivity_info)
	Get the touch sensitivity ratio. Implements touch_api_t::sensitivityRatioGet. More...

fsp_err_t	RM_TOUCH_ThresholdAdjust (touch_ctrl_t const p_ctrl, touch_sensitivity_info_t p_touch_sensitivity_info)
	Adjust the touch judgment threshold. Implements touch_api_t::thresholdAdjust. More...

fsp_err_t	RM_TOUCH_DriftControl (touch_ctrl_t *const p_ctrl, uint16_t input_drift_freq)
	Control drift correction. Implements touch_api_t::driftControl. More...

Detailed Description

This module supports the Capacitive Touch Sensing Unit (CTSU). It implements the Touch Middleware Interface.

Overview

The Touch Middleware uses the CTSU (r_ctsu) API and provides application-level APIs for scanning touch buttons, sliders, and wheels. This module is configured via the QE for Capacitive Touch.

Features

Supports touch buttons (Self and Mutual), sliders, and wheels
Can retrieve the status of up to 64 buttons at once
Software and external triggering
Callback on scan end
Collects and calculates usable scan results:
- Slider position from 1 to 100 (percent)
- Wheel position from 1 to 360 (degrees)
Dynamic touch-judgment-threshold adjustment
Calculate the XY coordinates of the pad(CTSU2)
Optional (build time) support for real-time monitoring functionality through the QE tool over UART
Optional (build time) support for tuning function through the QE Standalone Version tool over UART
TrustZone Support

Configuration

Note: This module is configured via the QE for Capacitive Touch. For information on how to use the QE tool, once the tool is installed click Help -> Help Contents in e² studio and search for "QE".

This module supports the QE monitor function. The monitor determines whether to use debugger or serial communications, determines the type of the information from QE and sends only the necessary information. This module supports the serial tuning function with the standalone version of QE. Generates a configuration configuration file by UART communication with QE.

Note: Multiple configurations can be defined within a single project allowing for different scan procedures or button layouts.

Build Time Configurations for rm_touch

The following build time configurations are defined in fsp_cfg/rm_touch_cfg.h:

Configuration	Options	Default	Description
Parameter Checking	Default (BSP) Enabled Disabled	Default (BSP)	If selected code for parameter checking is included in the build.
Support for QE monitoring using UART	Enabled Disabled	Disabled	Enable SCI_UART support for QE monitoring.
Support for QE Tuning using UART	Enabled Disabled	Disabled	Enable SCI_UART support for QE Tuning.
Type of chattering suppression	TypeA : Counter of exceed threshold is hold within hysteresis range TypeB : Counter of exceed threshold is reset within hysteresis range.	TypeA : Counter of exceed threshold is hold within hysteresis range	TypeA of chattering suppression : Counter of exceed threshold is hold within hysteresis range. / TypeB of chattering suppression : Counter of exceed threshold is reset within hysteresis range.

Configurations for CapTouch > Touch (rm_touch)

This module can be added to the Stacks tab via New Stack > CapTouch > Touch (rm_touch). Non-secure callable guard functions can be generated for this module by right clicking the module in the RA Configuration tool and checking the "Non-secure Callable" box.

Configuration	Options	Default	Description

Interrupt Configuration

Refer to the CTSU (r_ctsu) section for details.

Clock Configuration

Refer to the CTSU (r_ctsu) section for details.

Pin Configuration

Refer to the CTSU (r_ctsu) section for details.

Usage Notes

Measurements and Data Processing

The module determines whether the button has been touched based on the change in capacitance and detects the position of the slider or wheel. This requires continued periodic measurements of capacitance. When developing your application, make sure to periodically call RM_TOUCH_ScanStart() and RM_TOUCH_DataGet(). For more details, refer to the sample application.

Button Touch Determination

Touch judgment method

Touch detection has two modes in CTSU2.

Value Majority Mode (VMM)
Touch module obtains one measurement result for each button from CTSU module and outputs the touch judgment result.
The measurement results has been noise-reduced in CTSU (r_ctsu) module.

Value Majority Mode (VMM)
Judgement Majority Mode (JMM)
This mode supported from FSP V5.1.0 or later.
Touch module obtains three measurement results for each button from CTSU module, judges each touch, and outputs the final touch judgement result by majority vote.

Judgement Majority Mode (JMM)

Creating reference value and threshold

A touch button is not a mechanical button in which the ON/OF state is switched by hardware. The ON/OFF state is determined via software.
First, a reference value is created based on measurement results in the non-touch state. The initial reference value is the first measured value. The threshold is then determined with an arbitrary offset. If a measured value exceeds the threshold, the button is determined to be in the ON state, if it does not exceed the threshold, it is in the OFF state.
Processing for self-capacitance and mutual capacitance are basically the same. However, because the amount of capacitance decreases when a mutual capacitance button is touched, the user needs to set the threshold based on decreasing measured values to determine the ON/OFF state.
You can set the threshold for each button separately in the configuration settings (threshold in touch_button_cfg_t). The following functions are also included to deal with issues such as chattering suppression and changes in the external environment which affect actual touch recognition.
VMM : Creates one reference value and one threshold value for each button.
JMM : Creates three reference values and three threshold values for each button.

Positive Noise Filter/Negative Noise Filter

As a chattering countermeasure, you can confirm the ON/OFF state after a set number of consecutive ON or OFF determinations.
In the configuration settings (on_freq and off_freq in touch_cfg_t) set the number of consecutive ON or OFF states. You can do this for all buttons in the touch interface configuration. Be aware that, although this is an effective solution to improving chattering, the greater the number of consecutive states, the slower the response to actual touch.

Hysteresis

This is another chattering countermeasure. Offset the constant to the threshold after the state goes to ON, and prevent chattering by using hysteresis as the OFF-to-ON and ON-to-OFF threshold.
You can set the hysteresis value for each button in the configuration settings (hysteresis in touch_button_cfg_t). The larger the hysteresis, the more effective the countermeasure is in suppressing chattering. However, keep in mind that this will make it more difficult to return the state from ON-to-OFF of OFF-to-ON.
VMM : One hysteresis for each button.
JMM : Three hysteresis for each button.

Drift Correction Process

As a countermeasure for changes in the external environment, the drift correction process refreshes the reference value.
After averaging the measured value in the OFF state over a set period, if the button is in the touch OFF state after a set period, the reference value is refreshed. The drift correction is only executed in the OFF state and is cleared when touch ON is determined.
Set the period in the configuration settings (drift_freq in touch_cfg_t). You can do this for all buttons in the touch interface configuration. This allows you to adjust the ability to determine the touch state despite changes in the external environment.
VMM : Drift corrects one baseline value per button.
JMM : Drift corrects three baseline value per button.

Button Touch Determination

Press and hold cancel

Strong noise or other sudden environment changes can disable the drift correction process, preventing return from the ON state. The press and hold cancel function implements the drift correction process and returns the button from the ON state by forcibly turning the state to OFF after a certain number of consecutive ON state periods.
Set the number of consecutive ON periods required for the press and hold cancel function to return the button to the OFF state in the configuration settings (cancel_freq in touch_cfg_t). You can do this for all buttons in the touch interface configuration.

Chattering suppression type (Build option)

This build option is a function to supplement the above functions (Positive Noise Filter/Negative Noise Filter and Hysteresis) for performing touch judgment.
This build option changes the processing method for Counter of exceed threshold to TypeA or TypeB.
TypeA of chattering suppression : Counter of exceed threshold is hold within hysteresis range.
TypeB of chattering suppression : Counter of exceed threshold is reset within hysteresis range.

Chattering suppression type

Touch Position Detection of Slider/Wheel

Configure a slider with multiple terminals to be measured (TS) physically arranged in a straight line. Configure a wheel with multiple terminals physically arranged in a circle.
The touch position is calculated from the measured values of the TS in the configuration. The calculation method for sliders and wheels is fundamentally the same.

Touch judgement mode of Slider/Wheel.

Slider and wheel coordinate calculation has two modes in CTSU2.

VMM
Touch module gets the measurement result of each slider and wheel from the CTSU module and calculate the coordinate.
The measurement results has been noise-reduced in CTSU module.

Value Majority Mode (Slider,Wheel)
JMM
Touch module get three measurement results for each slider and wheel from the CTSU module, calculate the coordinates for each, select two coordinates by judgement majority, and average the two coordinate results.

Judgement Majority Mode (Slider,Wheel)

Touch Position calculation of Slider/Wheel

Detect the maximum value (TS_MAX) among the terminals in the configuration.
Calculate the difference (d1, d2) between TS_MAX and the terminals on either side. (If the TS_MAX terminal is at one end of the slider, use the values of the two terminals to the right or left, accordingly.)
If the total of d1 and d2 exceeds the threshold, position calculation is initiated. If the total amount does not exceed the threshold, the position calculation process is ended.
With TS_MAX as the middle position, the ratio of d1 to d2 is used to calculate the position. The slider has a range of 1 to 100, and the while has a range of 1 to 360.

	Slider	Wheel
Electrode type	Self capacitance only	Self capacitance only
Number of electrodes	3-10	4+
Touch position output range	1-100	1-360
Default value (no touch)	0xFFFF	0xFFFF

Tuning the Touch Determination Adjustment

When QE tuning, a measurement is performed with a finger touching the button and the tuned parameters are output in the configuration file. The setting value of the threshold is 60% of the touch sensitivity between touch and non-touch state, and the setting value of the hysteresis coefficient is 5% of the threshold.
This module provides the functions for dynamic adjusting of these threshold and hysteresis coefficient.
They are two functions as below.

Adjusting the threshold and hysteresis coefficient to an arbitrary ratio.
Use RM_TOUCH_ThresholdAdjust().

When changing the touch determination threshold ratio from 60% QE set to 70% user specified, the touch determination thresholds are as below.
If you want to make this setting, set the member of the second argument as follows. It is also necessary to set the ratio of the amount of touch change and the hysteresis value.

*p_touch_sensitivity_ratio = 100,
old_threshold_ratio = 60,
new_threshold_ratio = 70,
new_hysteresis_ratio = 5

Example of changing the threshold ratio

Adjusting the threshold and hysteresis coefficient according to the current touch sensitivity.
Use RM_TOUCH_SensitivityRatioGet(), RM_TOUCH_ThresholdAdjust(), and RM_TOUCH_DriftControl().

When changing the kind of the overlay panel, the touch sensitivity differs from the one QE tuned. Wanting to use the software as it is without re-tuning. If you use a thicker overlay than that at QE tuning, the touch sensitivity decreases, and a touch may not be determined because of the same touch determination threshold. This function adjusts the touch determination threshold based on the ratio of the touch sensitivity after changing the overlay to the touch sensitivity at the QE tuning.

RM_TOUCH_SensitivityRatioGet() outputs the ratio of the current touch sensitivity assuming that the touch sensitivity at the QE setting is 100%.
The following figure shows the case where an overlay panel is thinner and the touch sensitivity increases.

Example of increase touch sensitivity for thin overlay panels

Following figure shows the case where an overlay panel is thicker and the touch sensitivity decreases.

Example of decrease touch sensitivity for thicker overlay panels

RM_TOUCH_ThresholdAdjust() sets the new touch determination threshold and the hysteresis value by using the touch sensitivity ratio obtained with RM_TOUCH_SensitivityRatioGet() as arguments.

Example of calculation 1:
The touch sensitivity ratio is 140%, and the threshold set by QE is 1500.
Threshold = 140 * 1500 / 100 = 2100

*p_touch_sensitivity_ratio = 140,
old_threshold_ratio = 60,
new_threshold_ratio = 60,
new_hysteresis_ratio = 5

Example of calculation 1

Example of calculation 2:
The touch sensitivity ratio is 60%, and the threshold set by QE is 1500.
Threshold = 60 * 1500 / 100 = 900

*p_touch_sensitivity_ratio = 60,
old_threshold_ratio = 60,
new_threshold_ratio = 60,
new_hysteresis_ratio = 5

Example of calculation 2

RM_TOUCH_DriftContorol() set the second argument to 0 to stop the drift correction function.
When calculating the ratio of the touch change amount using RM_TOUCH_SensitivityRatioGet(), the touch change amount decreases due to the thick overlay, and the threshold value is not exceeded even if touched. Prevents the reference value from drifting.

Example of the application for adjustment using data flash without re-tuning or software rewriting

Enable UART communication to PC and ‘tuning mode’. In tuning mode, the MCU transmits the ratio of the touch sensitivity in the touch state to the PC in real time. A user sends a command to decide the ratio while monitoring on the PC. The MCU stores the received ratio in the data flash. Make sure that the ratio stored in the data flash is read at the software activation, and the touch determination threshold is adjusted based on this stored value.

Pad

Configure a pad with multiple terminals physically arranged in cross.
The current position is Calculated from the measured values of the CTSU mutual scanning in the configuration.
Use RM_TOUCH_PadDataGet().
Pad is subject so some limitations:

	Pad
Electrode type	CFC mutual capacitance only
Number of electrodes	RX(TS-CFC)3+, TX(Any TS)3+
Touch position output range	rx_coodinate:(0 ~ rx_pixel), tx_coodinate:(0 ~ tx_pixsel)
Default value (no touch)	rx_coodinate:0xFFFF, tx_coodinate:0xFFFF
Pixel range	rx_pixel:(1 ~ 65535), tx_pixsel:(1 ~ 65535)

Pitch for each terminal can be set with QE. Pitch's default value is 64.
The relationship between pixel and pitch : Pixel = Pitch × number of TS - 1

Example of Pad

TrustZone Support

In r_ctsu and rm_touch module, Non-Secure Callable Guard Functions are only generated from QE for Capacitive Touch. QE can be used for tuning in secure or flat project, but not in non-secure project. If you want to use in non-secure project, copy the output file from secure or flat project. Refer to QE Help for more information.

Examples

Basic Example

This is a basic example of minimal use of the TOUCH in an application.

void touch_basic_example (void)
{
    fsp_err_t err = FSP_SUCCESS;
    err = RM_TOUCH_Open(&g_touch_ctrl, &g_touch_cfg);
    /* Handle any errors. This function should be defined by the user. */
    assert(FSP_SUCCESS == err);
    while (true)
    {
        RM_TOUCH_ScanStart(&g_touch_ctrl);
        while (0 == g_flag)
        {
            /* Wait scan end callback */
        }
        g_flag = 0;
        err = RM_TOUCH_DataGet(&g_touch_ctrl, &button, slider, wheel);
        if (FSP_SUCCESS == err)
        {
            /* Application specific data processing. */
        }
    }
}

Multi Mode Example

This is a optional example of using both Self-capacitance and Mutual-capacitance. Refer to the Multi Mode Example in CTSU usage notes.

void touch_optional_example (void)
{
    fsp_err_t err = FSP_SUCCESS;
    err = RM_TOUCH_Open(&g_touch_ctrl, &g_touch_cfg);
    assert(FSP_SUCCESS == err);
    err = RM_TOUCH_Open(&g_touch_ctrl_mutual, &g_touch_cfg_mutual);
    assert(FSP_SUCCESS == err);
    while (true)
    {
        RM_TOUCH_ScanStart(&g_touch_ctrl);
        while (0 == g_flag)
        {
            /* Wait scan end callback */
        }
        g_flag = 0;
        RM_TOUCH_ScanStart(&g_touch_ctrl_mutual);
        while (0 == g_flag)
        {
            /* Wait scan end callback */
        }
        g_flag = 0;
        err = RM_TOUCH_DataGet(&g_touch_ctrl, &button, slider, wheel);
        if (FSP_SUCCESS == err)
        {
            /* Application specific data processing. */
        }
        err = RM_TOUCH_DataGet(&g_touch_ctrl_mutual, &button, slider, wheel);
        if (FSP_SUCCESS == err)
        {
            /* Application specific data processing. */
        }
    }
}

Data Structures
struct	touch_button_info_t

struct	touch_slider_info_t

struct	touch_wheel_info_t

struct	touch_pad_info_t

struct	touch_instance_ctrl_t

Data Structure Documentation

◆ touch_button_info_t

struct touch_button_info_t

Information of button

Data Fields
uint64_t	status	Touch result bitmap.
uint16_t *	p_threshold	Pointer to Threshold value array. g_touch_button_threshold[] is set by Open API.
uint16_t *	p_hysteresis	Pointer to Hysteresis value array. g_touch_button_hysteresis[] is set by Open API.
uint16_t *	p_reference	Pointer to Reference value array. g_touch_button_reference[] is set by Open API.
uint16_t *	p_on_count	Continuous touch counter. g_touch_button_on_count[] is set by Open API.
uint16_t *	p_off_count	Continuous non-touch counter. g_touch_button_off_count[] is set by Open API.
uint32_t *	p_drift_buf	Drift reference value. g_touch_button_drift_buf[] is set by Open API.
uint16_t *	p_drift_count	Drift counter. g_touch_button_drift_count[] is set by Open API.
uint8_t	on_freq	Copy from config by Open API.
uint8_t	off_freq	Copy from config by Open API.
uint16_t	drift_freq	Copy from config by Open API.
uint16_t	cancel_freq	Copy from config by Open API.

◆ touch_slider_info_t

struct touch_slider_info_t

Information of slider

Data Fields
uint16_t *	p_position	Calculated Position data. g_touch_slider_position[] is set by Open API.
uint16_t *	p_threshold	Copy from config by Open API. g_touch_slider_threshold[] is set by Open API.

◆ touch_wheel_info_t

struct touch_wheel_info_t

Information of wheel

Data Fields
uint16_t *	p_position	Calculated Position data. g_touch_wheel_position[] is set by Open API.
uint16_t *	p_threshold	Copy from config by Open API. g_touch_wheel_threshold[] is set by Open API.

◆ touch_pad_info_t

struct touch_pad_info_t

Information of pad

Data Fields
uint16_t *	p_rx_coordinate	RX coordinate.
uint16_t *	p_tx_coordinate	TX coordinate.
uint16_t *	p_num_touch	number of touch
uint16_t *	p_threshold	Coordinate calculation threshold value.
uint16_t *	p_base_buf	ScanData Base Value Buffer.
uint16_t *	p_rx_pixel	X coordinate resolution.
uint16_t *	p_tx_pixel	Y coordinate resolution.
uint8_t *	p_max_touch	Maximum number of touch judgments used by the pad.
int32_t *	p_drift_buf	Drift reference value. g_touch_button_drift_buf[] is set by Open API.
uint16_t *	p_drift_count	Drift counter. g_touch_button_drift_count[] is set by Open API.
uint8_t	num_drift	Copy from config by Open API.

◆ touch_instance_ctrl_t

struct touch_instance_ctrl_t

TOUCH private control block. DO NOT MODIFY. Initialization occurs when RM_TOUCH_Open() is called.

Data Fields
uint32_t	open	Whether or not driver is open.
touch_button_info_t	binfo	Information of button.
touch_slider_info_t	sinfo	Information of slider.
touch_wheel_info_t	winfo	Information of wheel.
bool	serial_tuning_enable	Flag of serial tuning status.
touch_pad_info_t	pinfo	Information of pad.
touch_cfg_t const *	p_touch_cfg	Pointer to initial configurations.
ctsu_instance_t const *	p_ctsu_instance	Pointer to CTSU instance.

Function Documentation

◆ RM_TOUCH_Open()

fsp_err_t RM_TOUCH_Open	(	touch_ctrl_t *const	p_ctrl,
		touch_cfg_t const *const	p_cfg
	)

Opens and configures the TOUCH Middle module. Implements touch_api_t::open.

Example:

    err = RM_TOUCH_Open(&g_touch_ctrl, &g_touch_cfg);

Return values

FSP_SUCCESS	TOUCH successfully configured.
FSP_ERR_ASSERTION	Null pointer, or one or more configuration options is invalid.
FSP_ERR_ALREADY_OPEN	Module is already open. This module can only be opened once.
FSP_ERR_INVALID_ARGUMENT	Configuration parameter error.

◆ RM_TOUCH_ScanStart()

fsp_err_t RM_TOUCH_ScanStart ( touch_ctrl_t *const p_ctrl )

This function should be called each time a periodic timer expires. If initial offset tuning is enabled, The first several calls are used to tuning for the sensors. Before starting the next scan, first get the data with RM_TOUCH_DataGet(). If a different control block scan should be run, check the scan is complete before executing. Implements touch_api_t::scanStart.

Return values

FSP_SUCCESS	Successfully started.
FSP_ERR_ASSERTION	Null pointer passed as a parameter.
FSP_ERR_NOT_OPEN	Module is not open.
FSP_ERR_CTSU_SCANNING	Scanning this instance or other.
FSP_ERR_CTSU_NOT_GET_DATA	The previous data has not been retrieved by DataGet.

◆ RM_TOUCH_DataGet()

fsp_err_t RM_TOUCH_DataGet	(	touch_ctrl_t *const	p_ctrl,
		uint64_t *	p_button_status,
		uint16_t *	p_slider_position,
		uint16_t *	p_wheel_position
	)

Gets the 64-bit mask indicating which buttons are pressed. Also, this function gets the current position of where slider or wheel is being pressed. If initial offset tuning is enabled, The first several calls are used to tuning for the sensors. Implements touch_api_t::dataGet.

Note

FSP v4.0.0 or later,

The value of 'Secondary - Primary' is modified from uint16_t to int16_t. When the value of 'Secondary - Primary' is larger than 32767 and less than -32767, this API return FSP_ERR_INVALID_DATA.
An upper limit is set for the value of Secondary. When the value of Secondary is larger than 45000, this API return FSP_ERR_INVALID_DATA.

Return values

FSP_SUCCESS	Successfully data decoded.
FSP_ERR_ASSERTION	Null pointer passed as a parameter.
FSP_ERR_NOT_OPEN	Module is not open.
FSP_ERR_INVALID_DATA	Accuracy of data is not guaranteed.
FSP_ERR_CTSU_SCANNING	Scanning this instance.
FSP_ERR_CTSU_INCOMPLETE_TUNING	Incomplete initial offset tuning.

◆ RM_TOUCH_PadDataGet()

fsp_err_t RM_TOUCH_PadDataGet	(	touch_ctrl_t *const	p_ctrl,
		uint16_t *	p_pad_rx_coordinate,
		uint16_t *	p_pad_tx_coordinate,
		uint8_t *	p_pad_num_touch
	)

This function gets the current position of pad is being pressed. Implements touch_api_t::padDataGet , g_touch_on_ctsu.

Note

FSP v4.0.0 or later,

The value of 'Secondary - Primary' is modified from uint16_t to int16_t. When the value of 'Secondary - Primary' is larger than 32767 and less than -32767, this API return FSP_ERR_INVALID_DATA.
An upper limit is set for the value of Secondary. When the value of Secondary is larger than 45000, this API return FSP_ERR_INVALID_DATA.

Return values

FSP_SUCCESS	Successfully data decoded.
FSP_ERR_ASSERTION	Null pointer.
FSP_ERR_NOT_OPEN	Module is not open.
FSP_ERR_INVALID_DATA	Accuracy of data is not guaranteed.
FSP_ERR_CTSU_SCANNING	Scanning this instance.

◆ RM_TOUCH_ScanStop()

fsp_err_t RM_TOUCH_ScanStop ( touch_ctrl_t *const p_ctrl )

Scan stop specified TOUCH control block. Implements touch_api_t::scanStop.

Return values

FSP_SUCCESS	Successfully closed.
FSP_ERR_ASSERTION	Null pointer passed as a parameter.
FSP_ERR_NOT_OPEN	Module is not open.

◆ RM_TOUCH_CallbackSet()

fsp_err_t RM_TOUCH_CallbackSet	(	touch_ctrl_t *const	p_api_ctrl,
		void()(touch_callback_args_t )	p_callback,
		void const *const	p_context,
		touch_callback_args_t *const	p_callback_memory
	)

Updates the user callback and has option of providing memory for callback structure. Implements touch_api_t::callbackSet

Return values

FSP_SUCCESS	Callback updated successfully.
FSP_ERR_ASSERTION	A required pointer is NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened.

◆ RM_TOUCH_Close()

fsp_err_t RM_TOUCH_Close ( touch_ctrl_t *const p_ctrl )

Disables specified TOUCH control block. Implements touch_api_t::close.

Return values

FSP_SUCCESS	Successfully closed.
FSP_ERR_ASSERTION	Null pointer passed as a parameter.
FSP_ERR_NOT_OPEN	Module is not open.

◆ RM_TOUCH_SensitivityRatioGet()

fsp_err_t RM_TOUCH_SensitivityRatioGet	(	touch_ctrl_t *const	p_ctrl,
		touch_sensitivity_info_t *	p_touch_sensitivity_info
	)

Get the touch sensitivity ratio. Implements touch_api_t::sensitivityRatioGet.

Return values

FSP_SUCCESS	Successfully touch sensitivity ratio got.
FSP_ERR_ASSERTION	Null pointer passed as a parameter.
FSP_ERR_NOT_OPEN	Module is not open.
FSP_ERR_CTSU_SCANNING	Scanning this instance.
FSP_ERR_CTSU_INCOMPLETE_TUNING	Incomplete initial offset tuning.

◆ RM_TOUCH_ThresholdAdjust()

fsp_err_t RM_TOUCH_ThresholdAdjust	(	touch_ctrl_t *const	p_ctrl,
		touch_sensitivity_info_t *	p_touch_sensitivity_info
	)

Adjust the touch judgment threshold. Implements touch_api_t::thresholdAdjust.

Return values

FSP_SUCCESS	Successfully touch judgment threshold was adjusted.
FSP_ERR_ASSERTION	Null pointer passed as a parameter.
FSP_ERR_NOT_OPEN	Module is not open.

◆ RM_TOUCH_DriftControl()

fsp_err_t RM_TOUCH_DriftControl	(	touch_ctrl_t *const	p_ctrl,
		uint16_t	input_drift_freq
	)

Control drift correction. Implements touch_api_t::driftControl.

Return values

FSP_SUCCESS	Successfully drift correction was controlled.
FSP_ERR_ASSERTION	Null pointer passed as a parameter.
FSP_ERR_NOT_OPEN	Module is not open.

Functions

Detailed Description

Overview

Features

Configuration

Build Time Configurations for rm_touch

Configurations for CapTouch > Touch (rm_touch)

Interrupt Configuration

Clock Configuration

Pin Configuration

Usage Notes

Measurements and Data Processing

Button Touch Determination

Touch judgment method

Creating reference value and threshold

Positive Noise Filter/Negative Noise Filter

Hysteresis

Drift Correction Process

Press and hold cancel

Chattering suppression type (Build option)

Touch Position Detection of Slider/Wheel

Touch judgement mode of Slider/Wheel.

Touch Position calculation of Slider/Wheel

Tuning the Touch Determination Adjustment

Adjusting the threshold and hysteresis coefficient to an arbitrary ratio. Use RM_TOUCH_ThresholdAdjust().

Adjusting the threshold and hysteresis coefficient according to the current touch sensitivity. Use RM_TOUCH_SensitivityRatioGet(), RM_TOUCH_ThresholdAdjust(), and RM_TOUCH_DriftControl().

Example of the application for adjustment using data flash without re-tuning or software rewriting

Pad

TrustZone Support

Examples

Basic Example

Multi Mode Example

Data Structures

Data Structure Documentation

◆ touch_button_info_t

◆ touch_slider_info_t

◆ touch_wheel_info_t

◆ touch_pad_info_t

◆ touch_instance_ctrl_t

Function Documentation

◆ RM_TOUCH_Open()

◆ RM_TOUCH_ScanStart()

◆ RM_TOUCH_DataGet()

◆ RM_TOUCH_PadDataGet()

◆ RM_TOUCH_ScanStop()

◆ RM_TOUCH_CallbackSet()

◆ RM_TOUCH_Close()

◆ RM_TOUCH_SensitivityRatioGet()

◆ RM_TOUCH_ThresholdAdjust()

◆ RM_TOUCH_DriftControl()

Adjusting the threshold and hysteresis coefficient to an arbitrary ratio.
Use RM_TOUCH_ThresholdAdjust().

Adjusting the threshold and hysteresis coefficient according to the current touch sensitivity.
Use RM_TOUCH_SensitivityRatioGet(), RM_TOUCH_ThresholdAdjust(), and RM_TOUCH_DriftControl().