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Freescale Touch Sensing
Software 2.5 Kinetis Preview
Release Notes
PRODUCT:
PRODUCT VERSION:
DESCRIPTION:
RELEASE DATE:
Freescale TSS
2.5 Kinetis Preview
Freescale Touch Sensing Software Library, version 2.5
November 9 2010
th
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© Freescale Semiconductor, Inc. 2009. All rights reserved.
Rev. 6
11/2010
Freescale TSS Release Notes
Freescale Semiconductor
1
Table of Contents
1 Introduction ..................................................................................................................................... 3
1.1 Requirements ............................................................................................................................. 3
1.1.1 System Requirements ......................................................................................................... 3
1.1.2 Target Requirements ........................................................................................................... 3
1.2 Special Instructions .................................................................................................................... 4
1.2.1 Installation Instructions ........................................................................................................ 4
2 Release Content ............................................................................................................................. 5
2.1 Example Applications ................................................................................................................. 5
3 New Features .................................................................................................................................. 6
4 Release Description ....................................................................................................................... 7
4.1 Supported Features ................................................................................................................... 7
4.2 Limitations .................................................................................................................................. 7
5 Release History ............................................................................................................................... 8
Freescale TSS Release Notes
Freescale Semiconductor
2
1 Introduction
This document describes the Freescale Touch Sensing Software (TSS) version 2.5 released for
ARM
®
Cortex™-M4 Kinetis processor family.
This is the preview version of the TSS 2.5 library for the Kinetis family. It is based on and is
backward compatible with TSS version 2.0. The features described here are not ported back to
HCS08 and ColdFire
®
V1 platforms. A full TSS 2.5 release will bring the new library features to all
Kinetis, HCS08, and ColdFire
®
V1 platforms.
1.1 Requirements
1.1.1 System Requirements
The ARM
®
Cortex™-M4 version of the library was developed, compiled and tested with IAR
Embedded Workbench for ARM Version 5.50.6 and Version 6.10.
The system requirements are defined by the development tools requirements. There are no special
host system requirements for hosting the Freescale TSS distribution.
Minimum PC configuration:
As required by CodeWarrior
®
Development Studio
Recommended PC configuration:
2 GHz processor – 2 GB RAM - 2 GB free disk space
Software requirements:
OS: As required by development tools (Windows XP SP2 or later recommended)
1.1.2 Target Requirements
The Freescale TSS in this release supports the ARM
®
Cortex™-M4 families of microcontrollers. The
requirements for the target hardware are same as the operating requirement of your evaluation or
custom board (power supply, cabling, jumper settings etc).
There are physical parameters that directly affect the Touch Sensing performance like electrodes
design, PCB routing, parasitic capacitance at processor pins etc. Refer to appropriate Application
Notes related to the software-based capacitive measurements available on
/touchsensing .
This release of Freescale TSS contains application examples for the following boards:
TWR-K60N512 Tower board with MK60N512
TWR-K40X256 Tower board with MK40X256
The boards are available for purchase at Freescale web site.
Freescale TSS Release Notes
Freescale Semiconductor
3
1.2 Special Instructions
1.2.1 Installation Instructions
Run the self-extracting executable and proceed according to instructions on the screen. Refer to
Touch Sensing Software User Guide available in the Start/Programs menu after installation.
Freescale TSS Release Notes
Freescale Semiconductor
4
2 Release Content
This is release version 2.5 of the Freescale Touch Sensing Software. The content is described in
the following table.
Deliverable
TSS Library Files
ARM®Cortex™-M4
Master library header file
Support header files
Compile-time configuration library files
Examples
Example of user configuration header file
Example applications for TWR-K60n512 board
Example applications for TWR-K40x256 board
Documentation
User Documentation
PC Host Tools
System Setup Creator tool
Check for Latest Version tool
Location
.../lib/TSS_ARM.a
.../lib/TSS_API.h
.../lib/*.h
.../lib/*.c
.../examples/default_config/
TSS_SystemSetup.h
.../examples/ TWRKXX_DEMO
.../examples/ TWRKXX_DEMO
.../doc/
…/tools/System Setup
…/tools/
Status
new
updated
reworked
reworked
updated
new
new
updated
updated
updated
The following picture shows the Freescale TSS directories installed to the user host computer:
2.1 Example Applications
--- Documentation
--- Configuration examples
and example applications
--- TSS Library Files
--- PC Host Tools
Example applications are included in the library distribution in the examples folder.
- twrk60n512 demo application for the TWR-K60N512 board servicing all four electrodes of
the board and demonstrating use of Keypad decoder. TSI module is used for electrode
sensing. Touch status of each electrode is indicated by LED placed inside the electrode
area. The application is available in the /examples/TWRKXX_DEMO folder.
- twrk40x256 demo application for the TWR-K40X256 board servicing all four electrodes of
the board and demonstrating use of Keypad decoder. TSI module is used for electrode
sensing. Touch status of each electrode is indicated by LED placed inside the electrode
area. The application is available in the /examples/TWRKXX_DEMO folder.
Freescale TSS Release Notes
Freescale Semiconductor
5
3 New Features
Freescale is committed to maintain this product and to deliver updates and enhancements timely.
This section describes the major changes and new features implemented in this release.
In comparison to version 2.0, the TSS 2.5 Kinetis Preview release implements the following
features:
- TSS Library
o ARM
®
Cortex™-M4 support added. The TSS_ARM.a precompiled library for
ARM
®
Cortex™-M4 was added into the lib directory.
o Touch Sense Input (TSI) hardware module added. The module enables robust
hardware-driven capacitance measurements to be performed without CPU intervention.
The TSS library has been reworked to enable such a “background” processing and
save CPU time and power consumption.
o GPIO (ATL, CTS) and other low-level layer sensing algorithms are still available in the
TSS library and may be used to detect touch on electrodes connected to non-TSI pins.
o TSI active mode clock configuration parameters added into the TSS_SystemSetup.h
file.
o TSI bit-resolution parameter (TSS_TSI_RESOLUTION) added into the
TSS_SystemSetup.h file. The TSS code automatically manages the TSI module
runtime configuration to achieve the desired resolution.
o ATL and CTS low-level layer sensing algorithms are no longer mutually exclusive. The
CTS method can be applied to the selected electrodes just like an ordinary method
additional to GPIO, TSI, and other. The electrode type is set up in the
TSS_SystemSetup.h file.
o The TSS low-level layer now enables to use the following methods: GPIO, CTS and
TSI. The other methods (PTI, KBI, TPM, FTM) known from TSS 2.0 will be supported in
the follow up library version. Selection of the electrode type is performed in
TSS_SystemSetup.h by the TSS_En_Type macro.
o Various trigger mechanisms are added. A new automatic trigger may help to achieve
periodic electrode sampling and let the TSI module to drive the period also for non-TSI
electrodes. In addition to the automatic trigger, two manual triggers may be used to
reduce complexity of conditional execution of TSS_Task when any kind of periodicity is
required.
o Source code files are renamed and the code is refactored:
- ATL_SENSOR_TIMEOUT and ATL_SENSOR_PRESCALER macros a renamed to
TSS_SENSOR_TIMEOUT and TSS_SENSOR_PRESCALER.
- ATL_Timer.h file renamed to TSS_Timer.h file.
- Macros with ATL_HW_TIMER_ prefix were renamed to use TSS_HW_TIMER_
prefix in TSS_Timer.h file.
- ATL_Sensor.h and ATL_Sensor.c files renamed to TSS_Sensor.h and
- Interrupt handlers for the low level layer methods moved to the appropriate
TSS_SensorXXX.c which enables to assign interrupt vector number automatically.
Freescale TSS Release Notes
Freescale Semiconductor
6
4 Release Description
4.1 Supported Features
- TSI HW module support for ARM
®
Cortex™-M4 Kinetis processors.
- Software-only capacitive touch sensing for. ARM
®
Cortex™-M4 Kinetis processors.
- Backward compatibility with TSS 1.x and 2.0.
- Easy to use and integrate with existing user applications.
- Electrode malfunction detection.
- Support for up to 64 electrodes.
- Compile-time configurable using a single header file (at user application level).
- Graphical System Setup Creator utility to help creating the configuration header file.
- Several touch-detection and capacity measurement algorithms available:
o TSI, GPIO, CTS.
- Advanced Key Detector signal processing layer.
- Decoded signals available to user application.
- Easy to use decoding structures with callback event notification.
o Keypad – keyboard decoder supporting multiple key press and auto-repeat.
o Slider – handling linearly distributed electrodes as a single up-down or left-right control.
o Rotary – handling ring-distributed electrodes as a single jog-dial-like control.
- Supports up to 16 instances of decoding controls.
4.2 Limitations
- This is the Kinetis Preview version of the library only. New features are not available to
HCS08 and ColdFire
®
V1 platforms.
- TSI and GPIO are the only available sampling methods. The pin interrupt and timer input
capture methods will be implemented in the future library version.
- Advanced Low Power and Wake-up features of the TSI module are not enabled in the
current library version.
Freescale TSS Release Notes
Freescale Semiconductor
7
5 Release History
Version 1.0 (September 21
st
2009)
- First public release of the library with an example for LG32-based TSSEVB Rev.B evaluation
board.
Version 1.1 (January 27
th
2010)
-
o Baseline Tracking bug fixed. The baseline was updated slowly in case of negative delta
value.
o TSS_ERROR_KEYPAD_NOT_IDLE state removed from TSS Keypad Decoder.
o DC Tracker init value changed from 64 to 100.
o Number of CTS measurements allowed to be interrupted by user application before a
timeout occurs was increased from 20 to 128.
o Setting the System Reset bit in the TSS System Configuration Register makes TSS to
restart immediately.
o atl_u8SampleIntFlag variable definition moved from ATL_Sensor.h to C code.
- TSSEVB_SINGLE application example
o I2CDvr.c file updated so the sensitivity can be set from EGT.
- TSSEVB_DEMO application example
o I2CDvr.c file updated so the sensitivity can be set from EGT.
o BUSclk changed to 20 MHz if CTS sensing algorithm selected. This enhances
algorithm sensitivity.
o SCI baud rate setting fixed since 20MHz bus clock is used with CTS sensing algorithm
selected. Needed to properly communicate with COMM JM60 device.
o Electrodes Sensitivity changed for Washing Machine demo application if CTS sensing
algorithm selected
Version 2.0 (August 23
rd
2010)
o ColdFire
®
V1 support added. The precompiled library for HCS08 family was
renamed to TSS_ and the TSS_CFV1.a precompiled library for ColdFire
®
V1
was added into the same directory.
o The IIR filter feature was implemented at the Key detector level. The filter processes
capacitance values obtained from low-level routines and works with both ATL and CTS
algorithms. Use of this feature is optional, enable it in TSS_SystemSetup.h.
o The Noise Amplitude Filter
function was implemented in the ATL and CTS low level.
The user can define the noise amplitude to be filtered. Noise peaks greater than the
defined amplitude are filtered by the system, thus disregarding the noisy sample. Use
of this feature is optional; enable it in TSS_SystemSetup.h together with setting the
Noise Amplitude Filter sizes for each electrode.
Freescale TSS Release Notes
Freescale Semiconductor
8
o The SWI feature which can be enabled in the TSS registers is available only for HCS08
version of the TSS library. The OnFault callback feature was added to enable handling
of a fault situation on both HCS08 and ColdFire
®
V1 processors. Specify name of
application callback function as the TSS_ONFAULT_CALLBACK parameter in the
TSS_SystemSetup.h file.
o Baseline balancing algorithm was simplified in the Key detector code.
o The ATL low level layer now enables to use also GPIO Port Interrupt, KBI and TPM
Input Capture modules to improve sensitivity. Use of this feature is optional, enable it in
TSS_SystemSetup.h.
o New TSS_Task “sequencing” feature enables to divide task processing to several steps
where each electrode is acquired in separate TSS_TaskSeq call. When all electrodes
are processed, the decoders are handled all at once in the last TSS_TaskSeq call.
o Default electrode pin state was changed to logic-high when measurement is idle. This
helps to achieve lower power consumption in low power modes. The only exception is
that a pin is set to logic-low state when timer timeout occurs (electrode charge timeout).
Timeout may be a symptom of short-grounded electrode, so setting the output pin to
logic low prevents high current sourced from pin and achieves lower power
consumption.
o ATL_SENSOR_TIMEOUT and ATL_SENSOR_PRESCALER macros were moved to
TSS_SystemSetup.h and are now configurable. Default value of
ATL_SENSOR_TIMEOUT was set to 511, ATL_SENSOR_PRESCALER was set to 2.
o Macros with ATL_TIMER_ prefix were renamed to use ATL_HW_TIMER_ prefix in
ATL_Timer.h in order to differentiate it from ATL_IC_TIMER_macros used for Timer
Input Capture method.
o ATL HW Timer Interrupt handler moved from inside of library to the ATL_Sensor.c
which enables to assign interrupt vector number automatically.
o GPIO Pin Interrupt-based measurement method added.
o FTM timer support added.
o The type of ATL Low Level routine return value was changed from UINT8 to UINT16,
making it more general for large capacitance differences between electrodes.
o The ATL_ElectrodesSetState function code was reduced in size and was renamed to
ATL_ElectrodesSetStateHigh. The function now only sets all electrodes to logic output-
high state as this is the only stat really used.
o Checking of Fault timeout and the u8FaultCnt counter variable was added to
ATL_SampleElectrode function. The timeout is set by macro ATL_FAULT_TIMEOUT in
ATL_Sensor.h.
o Fixed issues:
- When more than seven controls were used, the tss_cau8BuffMask[] array in
TSS_SystemSetupData.c was not defined properly.
- Removed warning messages when no control is used. The tss_pau8EventsBuff[] and
tss_acpsCSStructs[] arrays were not correctly defined in
- Removed redundant Warning messages if Slew Rate and Strength registers do not
exist.
- TSSEVB_SINGLE application example
Freescale TSS Release Notes
Freescale Semiconductor
9
o ATL_SENSOR_TIMEOUT and ATL_SENSOR_PRESCALER macros were moved to
TSS_SystemSetup.h. Macro ATL_HW_TIMER_TIMEOUT set to 1023,
ATL_SENSOR_PRESCALER set to 2.
o ATL_TimerIsr vector assignment removed from .prm file. This is now done
automatically by the TSS library code.
- TSSEVB_DEMO application example
o ATL_SENSOR_TIMEOUT and ATL_SENSOR_PRESCALER macros were moved to
TSS_SystemSetup.h. Macro ATL_HW_TIMER_TIMEOUT set to 1023,
ATL_SENSOR_PRESCALER set to 2.
o ATL_TimerIsr vector assignment removed from .prm file. This is now done
automatically by the TSS library code.
o Electrode pins where an alternative KBI or TPM channel feature is available were
reconfigured in TSS_SystemSetup.h to use new type of measurement.
- Processor Expert support
Processor Expert TSS Component v1.0 included in the form of PEupd package. The
component may help to configure the TSS library in an easy to use graphical environment.
Version 2.5 (Kinetis Preview 9
th
2010)
- TSI module added.
- Library implementation for the ARM
®
Cortex™-M4 Kinetis processor family.
- Demo applications provided for TWR-K60n512 and TWR-K40x256 boards. For details, refer
to New Features.
Freescale TSS Release Notes
Freescale Semiconductor
10
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