ST STM8S Bedienungsanleitung

February 2010 Doc ID 15330 Rev 4 1/23

UM0671

User manual

STM8/128-EV/TS

STM8S touch sensing evaluation board

Introduction

The STM8S touch sensing evaluation kit (STM8/128-EV/TS) provides a platform that

introduces users to STMicroelectronics capacitive touch sensing firmware library.

The kit contains an STM8S touch sensing (TS) evaluation daughterboard (STM8Sxxx-TS1)

in addition to the STM8/128-EVAL board.

The STM8S touch sensing evaluation daughterboard provides an evaluation platform for

resistor-capacitor (RC) touch sensing technology for an implementation using 5 keys and

one slider.

The STM8S TS evaluation kit provides a software solution for transforming any 8-bit STM8

microcontroller (MCU) into a capacitive touchkey controller.

For further details about the touch sensing software library, please read the technical

documentation available on www.st.com/touch-sense-sw-lib.

Figure 1. STM8S touch sensing evaluation kit

www.st.com

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Contents UM0671

2/23 Doc ID 15330 Rev 4

Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Getting started with the touch sensing evaluation kit . . . . . . . . . . . . . . 4

2.1 Evaluation kit contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Using the evaluation kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Evaluation kit board settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 STM8S touch sensing daughterboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1.1 Dielectric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1.2 Daughterboard MCU pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1.3 Daughterboard power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1.4 SWIM connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1.5 Analysis connectors (J2 and J3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.1.6 External supply and communication . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.2 STM8S2xx evaluation motherboard settings . . . . . . . . . . . . . . . . . . . . . . 13

4 Advanced evaluation using a debugging environment . . . . . . . . . . . . 15

4.1 Running the evaluation firmware in debug mode . . . . . . . . . . . . . . . . . . . 15

4.2 Entering debug mode using RLink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.3 Exploring key structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Appendix A STM8Sxxx-TS1 daughterboard schematics . . . . . . . . . . . . . . . . . . 21

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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UM0671 Overview

Doc ID 15330 Rev 4 3/23

1 Overview

This solution enables designers, comfortable with the use of standard microcontrollers, to

create higher-end “look and feel” user interfaces by replacing conventional electro-

mechanical switches with touch sensing controls.

Designers can combine touch sensing functions with traditional MCU features

(communication, LED control, beeper, LCD control, etc.).

The touch sensing firmware library is part of the application firmware.

Maturity, robustness, flexibility and performance make this solution simple to implement with

a low “time to market” period making it easy to develop all types of applications including

mobile phones, cooking appliances and printers only to name a few.

The STM8S TS evaluation kit comes pre-programmed with evaluation firmware that

manages 5 touch keys and one slider all available on the touch sensing daughterboard.

Using this kit, the user can easily evaluate the touch sensing software features and

performances by monitoring sensing parameters using an LCD display interface.

In development mode, designers are able to debug, modify, adapt or integrate the touch

sensing library in application firmware using a USB debugging and programming tools:

●Raisonance RLink debugger/programmer for ST microcontrollers

●STice in-circuit emulation system

●ST MCU Toolset with ST Visual Develop (STVD) IDE and ST Visual Programmer

(STVP) programming interface

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Getting started with the touch sensing evaluation kit UM0671

4/23 Doc ID 15330 Rev 4

2 Getting started with the touch sensing evaluation kit

2.1 Evaluation kit contents

The STM8S touch sensing evaluation kit (STM8/128-EV/TS) contains:

●STM8S touch sensing evaluation daughterboard (STM8Sxxx-TS1)

●STM8/128-EVAL board

●AC/DC power supply and its AC adaptors

●MCU selection guide

●User manual (this document)

IMPORTANT: The STM8 TS library, STM8 Toolset, STM8S firmware library and related

documentation are available at www.st.com/touch-sense-sw-lib

2.2 Using the evaluation kit

After connecting the motherboard to the mains supply, the evaluation kit is ready for use.

Just use the joystick to navigate through the menu options as described in Section 2.3: User

interface.

The evaluation firmware enables the user to quickly evaluate the main features of the touch

sensing library.

Figure 2. TS evaluation kit assembly

Daughterboard

Motherboard

Pre-programmed

STM8S sample

SWIM connector

Joystick

Reset

Power supply LCD display

Exit sub-menu

Enter sub-menu

Scroll right

Scroll left

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UM0671 Getting started with the touch sensing evaluation kit

Doc ID 15330 Rev 4 5/23

2.3 User interface

The joystick is the main user interface used to display keys values and state or to modify the

main touch sensing library parameters: de-bounce filter, detection time-out, low power

mode, DES setting, etc.

Note: The 5 touch sensing keys are also for navigating through the touch sensing menu.

Figure 3. Navigation scheme

1. After power on, to quickly display the key and slider states (display option 1), move the joystick once to the right (→) and

twice towards the bottom (↓).

Decrement

Resolution Increment

Resolution

**Menu**

Help push

down (1)

**Menu**

Key info **Menu**

Detect

TIMEOUT

**Menu**

De-bounce

Filter

**Menu**

Low Power

Mode

**Menu**

DES Setting **Menu**

About

Exit sub-menu

Enter sub-menu

Scroll right

Scroll left

Menu entry point

Detect

TIMEOUT

00 sec

De-bounce

Filter

Low Power

Mode

128 mSec

DES Setting

Disable

STM8S Touch

Eval Vx.x.x

**Menu**

Sel Key

summary

**Menu**

Select Key X **Menu**

Select slider

K1 K2 K3 K4 K5

Slider Bar: = = = = = = = = STATE Key X

Idle or Detected KeyX Sig=0x0184

KeyX Ref=0x015E Noise rejection

Counter KeyX

0000

Slider STATE

Idle or Detected S Sig=0x92

S Pos=0x09

< Resolution <

x bits

Display

sub-menus

1 2 3 45 6

Counter

RESET

Parameter

setting

sub-menus

S Resolution

x bits 7

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Getting started with the touch sensing evaluation kit UM0671

6/23 Doc ID 15330 Rev 4

Display options

Use the joystick to navigate through the sub-menus as shown in Figure 3 to do the following:

1. Display the state of keys (K1, K2, K3, K4 and K5) and slider on the same screen.

2. Display only the state of the selected key (Kx) (Idle or Detected).

3. Display the signal value and the reference threshold of the selected Key (Kx).

4. Display the number of samples rejected by the noise filtering system.

5. Display the state of the slider (Idle or Detected).

6. Display the signal value and the position of the slider.

7. Display/change slider resolution (default is 4 bits, may be set to up to 7 bits).

Parameter setting options

Use the joystick to navigate through the sub-menus as shown in Figure 3 to set the following

options:

1. Detection time-out

This feature automatically recalibrates keys after a fixed duration of continuous touch

detection. This prevents the keys from becoming 'stuck on' due to foreign objects or

other sudden influences. This is known as the detection time-out feature.

After recalibration, the keys will continue to operate normally, even if partially or fully

obstructed.

Infinite timeout (detection time-out value = 0) is useful in applications where a

prolonged detection can occur and where the output must reflect the detection

regardless of its duration.

2. De-bounce filter

The de-bounce filter reduces the effects of low frequency noise on key states. This

mechanism requires a specified number of measurements that qualify as detections

(and these must occur consecutively) or the detection will not be reported.

In a similar manner, the end of a touch (loss of signal) also has to be confirmed over

several measurements. This process acts as a type of “de-bounce” mechanism against

noise.

The typical value is equal to 2.

3. Low power mode

To reduce device power consumption, this feature inserts a low power mode window

between each key acquisition period.

This window duration is programmable with the following typical values (in

milliseconds): 0, 1, 2, 4, 8, 16, 32, 64, and 128.

4. Detection Exclusion System

The Detection Exclusion System (DES) prevents multiple keys from responding to a

single touch. This can happen with closely spaced keys.

Once a key is considered as “touched”, all other keys are locked in an untouched state.

To unlock these keys, the touched key must return to an untouched state.

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UM0671 Evaluation kit board settings

Doc ID 15330 Rev 4 7/23

3 Evaluation kit board settings

3.1 STM8S touch sensing daughterboard

Figure 4. STM8S TS daughterboard overview

STM8S MCU

This board uses a STM8S microcontroller (STM8S207K6T6C) in a 32-pin LQFP package.

Keys

The 5 touchkeys (electrodes) are made of a simple copper surface.

4 direction keys

1 selection key

Slider

Connectors to

board Analysis

I2C connector

SWIM

STM8S MCU

connectors

connector

STM8/128-EVAL

and jumper

IDD measurement

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Evaluation kit board settings UM0671

8/23 Doc ID 15330 Rev 4

Slider

The slider consists of 5 elementary juxtaposed electrodes.

Analysis connectors

All electrode and driven shield signals are available through two connectors (J2 and J3) for

analysis and monitoring.

I2C communication connector

In the event of I2C communication, the daughterboard provides a connector (J6) for the I2C

data and clock signals for interfacing with the STM8S microcontroller.

SWIM connector and setting jumper

A single-wire interface module (SWIM) interface (J5) with its associated jumper (W1) for

analysis and development.

3.1.1 Dielectric

A 1.5-mm thick Plexiglas panel (Figure 5) is used as a dielectric between the electrodes and

the touch surface. The user can replace this panel by another kind of dielectric with a

different thickness and/or material. Consequently, new firmware parameters will have to be

tuned.

Figure 5. Interchangeable dielectric panel

3.1.2 Daughterboard MCU pin functions

Table 1 describes the application functions assigned to each pin of the daughterboard

microcontroller.

The motherboard provides certain resources for the daughterboard such as the LCD, power

supply, LEDs, joystick, buzzer, etc.

For more information, see Section 3.2: STM8S2xx evaluation motherboard settings.

Screw holes

Table 1. Daughterboard MCU pin description

Pin no. Pin name Application usage Option Configuration

1RST

2 PA1 LED4 Disconnect R17

3 PA2 Backlight

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UM0671 Evaluation kit board settings

Doc ID 15330 Rev 4 9/23

Note: Options are selected using 0-ohm resistors.

4VSS

5VCAP

6VDD

7VDDIO_1

8 PF4 Load

9VDDA

10 VSSA

11 PB5 LED2 I²C SDA R43

12 PB4 LED3 I²C SCL R42

13 PB3 Joy Down

14 PB2 Joy Left

15 PB1 Joy Right

16 PB0 Joy Up

17 PE5 LCD CS

18 PC1 Key K1

19 PC2 Key K2

20 PC3 Key K3

21 PC4 Buzzer Driven shield keys R4/R46

22 PC5 SPI SCK

23 PC6 SPI MOSI

24 PC7 Key K4

25 PD0 Key K5

26 PD1 DB SWIM connector MB SWIM connector W1

27 PD2 Slider S5

28 PD3 Slider S4

29 PD4 Slider S3

30 PD5 Slider S2

31 PD6 Slider S1

32 PD7 Driven shield slider LED1 R45/R44

Table 1. Daughterboard MCU pin description (continued)

Pin no. Pin name Application usage Option Configuration

Evaluation kit board settings UM0671

10/23 Doc ID 15330 Rev 4

Table 2. Daughter/motherboard CN1 and CN5 header connections

Motherboard connector

(STM8/128-EVAL board) Daughterboard connector

(STM8S2Kxxx-TS1)

1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

17 18

19 20

21 22

23 24

25 26

27 28

29 30

31 32

33 34

35 36

37 38

39 40

41 42

43 44

45 46

47 48

49 50

+3V3

D5V

PE0

2EP1EP

4EP3EP

PE5

PE6PE7

1GP0GP

3GP2GP

PG4

6GP5GP

PG7

PH4

6HP5HP

PH7

1IP0IP

3IP2IP

5IP4IP

PI6

PI7

PC0

2CP1CP

PC3

5CP4CP

7

CP6CP

CN1 header

1 2

3 4

5 6

7 8

910

11 12

13 14

15 16

17 18

19 20

21 22

23 24

25 26

27 28

29 30

31 32

33 34

35 36

37 38

39 40

41 42

43 44

45 46

47 48

49 50

Header 25X2

PD0

PD2

PD4

PD6

PE5

PB0

PB1

PB3

PB2

PD3

PD5

PD1

D5V

RST R41

J1 header

PB4

PD7

PF4

PB5

R16

820

2ontheleft

1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

17 18

19 20

21 22

23 24

25 26

27 28

29 30

31 32

33 34

35 36

37 38

39 40

41 42

43 44

45 46

47 48

49 50

D5V

PF0PF1

PF2PF3

PF4PF5

PF6

PF7

PH0

2HP1HP

PH3

PD0

2DP1DP

4DP3DP

6DP5DP

PD7

PA1PA2

PA3PA4

PA5PA6

PB0

PB1PB2

PB3PB4

PB5

PB6PB7

PA0

RESET#

CN5 header

1 2

3 4

5 6

7 8

910

11 12

13 14

15 16

17 18

19 20

21 22

23 24

25 26

27 28

29 30

31 32

33 34

35 36

37 38

39 40

41 42

43 44

45 46

47 48

49 50

Header 25X2

+3.3V

D5V

PC6

PC3

PC1 PC2

PC5

PC7

PA2

J4 header

PC4

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