Capacitive-Touch Color Wheel Implementation
Contents
1. The threshold value can be reduced to increase sensitivity and the filter gain value can be reduced to allow a faster response time The user can modify the user defined parameters to match their application The estimated compensation values for Wheel1 and Wheel2 can be obtained by calling Touch Wheel Library function as described in Section 3 2 2 4 2 DAvE Bench Tool The Infineon s free tools DAvE and DAvE Bench are used to generate and compile the code for Color Wheel application The user should follow the procedure shown below and in Figure 5 when using DAvE Bench to modify and compile the code Procedure to modify Color Wheel Application software code Download and install DAvE Bench www infineon com dave bench Define a workspace for DAvE Bench Click File gt Import gt XC800 gt Existing Project Select the desired folder where the project exists RGB Wheel folder Default Tick option copy project into workspace Future changes will be reflected at the project in the workspace while original copy remain unchanged Click Finish to import the project Modify the software code Click Project gt Build Active Project to compile the code e Check the status of compilation on Console box If compilation is not successful the bugs are listed in the Problems box Once hex file is generated download the hex file using DAvE Bench XC800 FLOAD described further in2. Start Y Initialization of all modules Handled by XC800 FLOAD exe by clicking Connect button heck for P2 0 1 an Enter UART BSL Mode P2 1 0 y to update software code n v Light up ON LED Call Touch Wheel Library Function to m gt detect if touch wheel is touched calculate AverageL H calculate Angle Touch wheel is touched entre button is touched Y Y Update Wheel hue sat lum Change colur mode and with Angle output from Touch respective LED3 2 1 loop Wheel Lib depending on which color mode is enabled n Enter Power Down Mode Disable interrupts Disable WDT if enabled Disable all peripherals and ports except TS Configure RTC for 1 second y Save SER LTS TSVAL value Enter Power Down Mode2 Upon wake up wait for Time Frame interrupt Centre button is touchec for long period n then compare current LTS TSVAL with the Y saved value saved value of LTS TSVAL Light up RGB LED D2 TSVAL SUBTRACTION Transform HSL to RGB Update PWM duty cycle according to RGB value LTS TSVAL gt saved value Figure4 Overview Flow Chart of the Color Wheel Software Code Application Note 11 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Modifying Color Whe
3. switch to pagel while P2 DATAIN amp 0x01 MAIN vSoftReset USER CODE END End of function INT viExt0 Application Note 16 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Implementation of Color Wheel with XC822T 6 Implementation of Color Wheel with XC822T There are several on chip modules used in the Color Wheel Application Kit The configuration and usage of these modules are described in this chapter 6 1 Real Time Clock RTC Module Real Time Clock is configured for 1 second and is used for wake up in the Power saving control module 6 2 Power Saving Control Module The power saving mode saves on the power consumption when the board is not used Power Down Mode is entered when the centre button is pressed for a long period The configurations are Power Down Mode 2 Power down with RTC running e Wake up without reset SFR LTS_TSVAL value is saved before entering Power Down Mode At wake up every 1 second by the RTC module the software waits for the Time Frame flag indicates touch sensing on one pad completed before comparing the current SFR LTS_TSVAL with the saved_value i e saved value of LTS_TSVAL user defined TSVAL_SUBTRACTION If the latest SFR LTS_TSVAL value is more than the saved_value it means that the centre button is not pressed The Power Down Mode is therefore re entered and the latest SFR LTS_TSVAL value is re
4. 20 20 c cece llle 7 Touch Detection Methodology using Touch Wheel and LEDTS ROM Library 7 Touch Detection Methodology for the Centre Button llli 7 Touch Detection Methodology for the Touch Wheel 0 000 cee een 8 Touch Wheel Library uullleeleselleees ehh n nnns 9 Calc Touchwheel Function 0 0 ccc RR e 9 Calc Compensation Function lsseseeeeee e e 9 ROB LED ua 4 Se bP OED De C Eua wx ea Ra P aca ee Re AR UR Ine d 10 Overview Flow Chart of Color Wheel Software Code sleseeleeee ees 11 Modifying Color Wheel Software Code 0 0 eee eee 12 User Defined Parameters 0 000 eee n 12 DAVvE Bench T06l 4 as saeni ars aia ai TR RR RR e aed AE pw de ae a wk d eap a RR GRE Dae ANAS GME hk 12 Downloading Modified Color Wheel Software Code 2020000 cee eeee 15 Access Code to UART BSL Mode ssseseee eee eee 15 Implementation of Color Wheel with XC822T lesen 17 Real Time Clock RTC Module 0 0 cece m rr 17 Power Saving Control Module 0 00 eee 17 CCUG Module ec dk eR a os aw ate RO os ce RR Rea RR A RUE ROS 17 Interrupt System Module iiislseeeee mm hr 17 UART Module u wanna a gaa us a eR ogee ERO RU eee See en 17 LED and Touch Sense Controller Unit Module llle 17 Schematics and Layout of the Color Wheel Board 00000 200
5. 5 and Equation 6 to ensure that all values are equal under idle no touch condition S COMPENSATION WHEEL2 AVERAGEL H of WHEEL3 AVERAGEL H of WHEEL2 6 COMPENSATION WHEEL AVERAGEL H of WHEEL3 AVERAGEL H of WHEELI Application Note 9 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Implementation of Color Wheel Software The calc_compensation function provides the compensation values for Wheel1 and Wheel2 as described in Table 2 The user can call this function during board calibration to obtain an estimation of the compensation values The values can be programmed to observe the sensitivity of the touch wheel and further refined by the user This function should be called after an initialization period to get a stable value Suggested initialization period is about 640 Time Frame duration or interrupt and it can be calculated from Equation 7 7 Divisor n Period gt 2 x 8 x AccumulatorCounter 1 x Number of Touch sense inputs x TFD where Divisor n is defined as 2 e AccumulatorCounter is defined as 4 Number of Touch sense inputs TSIN x is 4 TFD is the Time Frame Duration Table 2 Specification of the Touch wheel Library Function calc compensation Function Name calc compensation Prototype void calc compensation int idata compensation Input Address pointer of touch wheel parameters compensation 0 The parameters include the
6. eeeuues 18 SUMMA 24 2 P 21 Application Note 4 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Introduction 1 Introduction This application note describes the Color Wheel Application Kit a ready to use implementation of the touch sensing application to adjust light colors with a touch wheel Figure 1 The kit is built around the XC822T a member of Infineon Technologies 8 bit microcontrollers XC800 Family which is capable of capacitive touch detection and LED driving with color control The implementation comprises of a touch wheel PCB board consisting of XC822T the LEDs and the software code running on XC822T This document takes the user through the steps necessary to create their own XC822T solution The source code provided can be modified and compiled with the free DAvE Bench tool chain The user can download the code into flash execute it and observe the touch wheel controls in action Please refer to the XC82x User s Manual for detailed description of the XC822T product 1 1 Overview The topics covered in this application note Color Wheel features Software Implementation details of Color Wheel software code Overview flow chart User defined parameters Modify and Compile code using DAvE Bench Download modified code using DAvE Bench XC800 FLOAD Hardware On chip modules utilized Board schematic and layout Figure 1 Color Wheel Applicati
7. of Time Slice s 42 x 256 48MHz x 2 Time Slices 448us Number of Touch sense inputs is 4 e AccumulatorCounter is defined as 4 in the software code 2 Minimum Valid Pad Detection Period VPDP OxFF ShortCount 1 x AEPACP where ShortCount is defined as OxF8 in the software code A long touch on the centre button is detected when both PadDownCounter PDC is 0x40 and PADFLAG 4 is 1 This long touch period is 1 71s defined in Equation 3 If a longer detection period is required modify PDC to a smaller value 3 Long Touch Period 0xFF PDC x AEPACP The maximum valid pad detection period is 2 28s as defined in Equation 4 For this period the code can be modified such that PADERROR 3 1 indicates a long touch on the centre button 4 Maximum Valid Pad Detection Period VPDP OxFF x AEPACP Note PDC is used to keep track of how long the pad is touched PDC is initialized to be OxFF at the start of a detected pad touch and is decremented once at each All Enabled Pads Accumulated Count Period AEPACP When pad touch is removed PDC is compared with the user input value ShortCount and or 0x00 to decide if pad touch is valid invalid or a long touch PDC is one of the parameters stored in XRAM at address OxFOFF by the FINDTOUCHEDPAD function Note Please refer to LEDTS ROM Library in the User s Manual for more details of the FINDTOUCHEDPAD function its inputs and its formulas 3 1 2 Touc
8. Chapter 5 Application Note 12 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Modifying Color Wheel Software Code There are two configurations Debug and Release available to compile the Color Wheel software code Select the hex file from the respective folder To select the required configuration select Project gt Properties gt C C Build gt Settings gt Manage Configurations Activate this option To view the differences between the Debug and Release configurations select Project gt Properties gt C C Build gt Settings User the Tool Settings tab select SDCC Compiler gt Optimization Select between Debug and Release configurations The default configuration is Debug Application Note 13 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Modifying Color Wheel Software Code dt XC800 Development DAvE Bench for XC800 File Edit Navigate Search Project Debug Tools New aksshiften gt TT ino Open File Select M Gr Import existing XC800 project into workspace j Gri HSHH Gris Select an import source db Import XC800 Project lo xi Eirlsshift s type filter text Import XC800 Project General This wizard helps to import an existing XC800 project t H E ccr into wor
9. K XC800 Family AP08113 Capacitive Touch Color Wheel Implementation Application Note V1 0 2010 08 Microcontrollers Edition 2010 08 Published by Infineon Technologies AG 81726 Munich Germany 2010 Infineon Technologies AG All Rights Reserved LEGAL DISCLAIMER THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE IMPLEMENTATION OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE REGARDED AS ANY DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY CONDITION OR QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT THE RECIPIENT OF THIS APPLICATION NOTE MUST VERIFY ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION INFINEON TECHNOLOGIES HEREBY DISCLAIMS ANY AND ALL WARRANTIES AND LIABILITIES OF ANY KIND INCLUDING WITHOUT LIMITATION WARRANTIES OF NON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OF ANY THIRD PARTY WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN THIS APPLICATION NOTE Information For further information on technology delivery terms and conditions and prices please contact the nearest Infineon Technologies Office www infineon com Warnings Due to technical requirements components may contain dangerous substances For information on the types in question please contact the nearest Infineon Technologies Office Infineon Technologies components may be used in life support devices or systems only with the express written approval of Infineon Technologies if a failure
10. PDC value U 2 o r c E 1o ct o v c c 3 3 3 3 Infineon Technologies Figure 2 Four touch sense inputs of Color Wheel Application Kit Note TSIN3 TSINO TSIN1 and TSIN2 are named WHEEL_C wheel1 WHEEL_1 wheel2 WHEEL 2 and wheel3 WHEEL_3 respectively as shown in the diagrams in Figure 2 and Figure 7 3 1 1 Touch Detection Methodology for the Centre Button The LEDTS ROM Library is used to detect a touch on the centre button The outputs of the FINDTOUCHEDPAD function show whether the centre pad is being touched i e PADRESULT 3 1 indicates that the centre pad is being touched and the color mode and its respective LED will be updated accordingly Application Note 7 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Implementation of Color Wheel Software The pad detection period depends on many parameters such as the number of pad turns and LED columns enabled and the accumulation of SFR LTS_TSVAL for example The All Enabled Pads Accumulated Count Period AEPACP is 8 96ms as defined in Equation 1 The ShortCount determines the minimum valid pad detection period VPDP The minimum valid pad detection period is 71 68ms calculated as shown in Equation 2 1 AEPACP TFD x Number of Touch sense inputs TSIN x x AccumulatorCounter 1 where TFD is Time Frame Duration PREscaler x 256 fCLK x Number
11. a wheel count 2 unsigned int idata j 0x1800 unsigned char idata value J v amp 7 7 8 amp 8 PEA EMEA 8 87 8 7 7 v y VL p AA RE 9 RIETI RI RI RI I9 9 T E Fa GQ RTC H SHARED INT C wens na zea os oco d ES Problems El console 23 SE Properties H se RG ks dm 78 7 startupxc82x s Ts x SEN 3 fa Ex F4 cal E UART C BEE MAIN rel MemInitxc82x rel PM rel E A uaRT H iid S RTC rel SHARED INT rel UART rel H RGB_Wheel tf startupxc82x rel Finished building target RGB Wheel hex D x E u able Smart Insert m Writable Smart Insert Figure 5 DAvE Bench GUI for Compiling the Color Wheel Software Code Application Note 14 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Downloading Modified Color Wheel Software Code 5 Downloading Modified Color Wheel Software Code The Color Wheel Application Kit is prepared to start up automatically after power on reset This is achieved by programming the Boot Mode Index BMI to User Mode Productive To download the software code the accessing of UART BSL Mode code must be included in the user flash code at all times see Section 5 1 The procedure to enter the UART BSL Mode to update software code is as follows Plugin Color Wheel board to computer v
12. and jump to software execution from the main routine The Color Wheel software flowchart is shown in Section 3 4 3 1 Touch Detection Methodology using Touch Wheel and LEDTS ROM Library The LEDTS ROM Library is enabled with a customized trip point for touch detection threshold and an oscillation window for the 4 touch sense inputs The centre button uses the TSIN3 touch sense input while the touch wheel is made up of 3 touch sense inputs TSINO TSIN1 and TSIN2 as shown in Figure 2 The 4 touch sense inputs are represented by bit 3 0 of the output parameters PADFLAG PADRESULT and PADERROR of the LEDTS ROM Library FINDTOUCHEDPAD function There are two touch detection methodologies used in the Color Wheel Application Kit LEDTS ROM Library touch detection methodology Touch Wheel Library Library TouchWheel lib touch detection methodology The centre button uses the LEDTS ROM Library touch detection methodology while the touch wheel uses the Touch Wheel Library touch detection methodology as described in Section 3 1 1 and Section 3 1 2 respectively eo Hue Sat Light XC822T a a inTouch800 Touch Detection Methodology by Touch Wheel Library and parameters from LEDTS ROM Library AVERAGELH of TSINO TSIN1 and TSIN2 User s inputs for Touch Wheel Library Touch Detection Methodology by LEDTS ROM Library PADRESULT Bit 3 TSIN3 PADERROR Bit 3 TSIN3 PADFLAG Bit 3 TSIN3
13. are functions running from ROM By taking the example provided and working with the Infineon s free tool chain the development of new applications for these devices is both simplified and straight forward Application Note 21 V1 0 2010 08
14. compensation for wheel2 and wheel Return None Output Wheel2 Compensation Value compensation 0 The Compensation Wheel2 value with respect to Wheel3 Wheel1 Compensation Value compensation 1 The Compensation Wheel1 value with respect to Wheel3 Max Stack size 2 Resource used XRAM address OxFOF6 OxFOFF 10 bytes 1 These parameters are stored by the FINDTOUCHEDPAD function and are used to calculate the Average value for the touch sense inputs 3 3 RGB LED Figure 3 shows how the touch detection on the touch wheel based on the color mode is reflected on the RGB LED D2 The HSL value is obtained from the Touch Wheel Library converted to an RGB value via the HSL TO RGB function and the CCUG registers are programmed where their respective pins are connected to the RGB LED RGB LED D2 Touch wheel and centre button HSL Color Space RGB Color Space PWM A D2 H value R value CCBOSRLH 12 2C REGHBHC A0L 2C R 8G x N N J S value G value I gt gt CCUG CC61SRL L value B value CC62SRLH Figure 3 HSL to RGB LED Block Diagram Application Note 10 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Implementation of Color Wheel Software 3 4 Overview Flow Chart of Color Wheel Software Code Figure 4 shows the overview flow chart of the Color Wheel software code
15. de compensation for wheel2 and wheel1 amplitude threshold and filter gain Refer to Section 4 1 for descriptions of the user defined parameters Address pointer of touch wheel angle wheel angle The angle value is updated when the touch wheel is touched Address pointer of touch wheel amplitude wheel amplitude 0 The amplitude includes the touch wheel position and the touch wheel initial average value Refer to Section 4 1 for descriptions of the user defined parameters Return None Output Touch wheel Status wheel amplitude 0 00 The touch wheel is not touched 200 The touch wheel is touched Touch wheel Position wheel angle This value is updated by the Touch Wheel Library when the touch wheel status is more than 0x00 i e a touch is detected on the touch wheel The HSL value is updated accordingly Touch wheel Average Value wheel amplitude 1 This value is calculated and updated by the Touch Wheel Library when the touch wheel is not touched Max Stack size 2 Resource used XRAM address OxFOF6 OxFOFF 10 bytes 1 These parameters are stored by the FINDTOUCHEDPAD function and are used to calculate the Average value for the touch sense inputs 3 2 2 Calc Compensation Function The compensation value is one of the user defined parameters for calc touchwheel function see Section 3 2 1 The compensation values for Wheel1 and Wheel2 are calculated with respect to Wheel3 as shown in Equation
16. el Software Code 4 Modifying Color Wheel Software Code The Color Wheel software example code can be accessed and modified by the user with DAvE Bench Infineon s free tool chain The user can modify the user defined parameters as described in Section 4 1 the timing code flow enabling disabling modules and interrupts handling for example as required for a specific application The Color Wheel software example code can be downloaded together with this application note 4 1 User Defined Parameters There are 6 parameters which the user can modify for the Touch Wheel Library based on their application board and usage The respective values and description are listed in Table 3 Table 3 User Defined Parameters for Color Wheel Software Code Parameter Current Value Description COMPENSATION_WHEEL2 11 Compensation value for Wheel2 due to environment COMPENSATION_WHEEL1 11 Compensation value for Wheel1 due to environment AMPLITUDE_THRESHOLD 0x400 Threshold value for amplitude Above threshold value is considered as touch on the touch wheel AMPLITUDE_FILTER_GAIN 5 Filter gain value for amplitude AMPLITUDE_START_VALUE 0x240 Start value for amplitude during initialization start up TSVAL_SUBTRACTION 3 To wake up the device via centre button Subtraction value to determine the threshold level Current TSVAL gt Saved TSVAL SUBTRACTION means the centre button is detected as no touch device remains in Power Down Mode
17. ematic of the Color Wheel Board Application Note 18 V1 0 2010 08 infir AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Schematics and Layout of the Color Wheel Board L1 V II BLM21 nn VCC VCC gt D lt TXD RXD USBDM g C5 C6 1u 16V 100n GND GND GND GND GND GND GND Figure8 Schematic of USB Interface on the Color Wheel Board VDD n m R13 OR GND GND n m Figure 9 Schematic of power supply of the Color Wheel Board Application Note 19 V1 0 2010 08 infir AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Schematics and Layout of the Color Wheel Board Figure 10 and Figure 11 show the top and bottom layout of the Color Wheel board respectively 7 wuw infineon com inTouch n E o7 n 2 m s TTP na Ir mal lo m a S iz ir Touch Control RGB_LED 2816 63 Figure 11 Bottom Layout of the Color Wheel Board Application Note 20 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Summary 8 Summary The capacitive touch sensing capability of the Infineon XC82x and XC83x Microcontrollers opens the door to a wide variety of applications The Infineon touch sensing solution described in this document is a total solution on chip comprising optimized hardware and effective softw
18. h Detection Methodology for the Touch Wheel The Touch Wheel Library Library_TouchWheel lib linked into the application code and programmed in the flash memory is used to detect a touch on the touch wheel It is provided as a lib file and is described in Section 3 2 The Touch Wheel Library makes use of the AverageL H values calculated by the LEDTS ROM Library to determine the absolute location of the current finger touch on the touch wheel In order to keep the averaging active the PADFLAG bits are cleared for touch sense inputs TSINO TSIN1 and TSIN2 Application Note 8 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Implementation of Color Wheel Software 3 2 Touch Wheel Library The Touch Wheel Library Library TouchWheel lib has 2 main functions calc touchwheel and calc compensation The functions are described in this section 3 2 1 Calc Touchwheel Function The calc touchwheel function provides the status i e whether touch wheel is touched the position the absolute position of the last touch on the touch wheel and the touch wheel average value as described in Table 1 Table 1 Specification of the Touch Wheel Library Function calc touchwheel Function Name calc_touchwheel Prototype void calc touchwheel int idata parameter char idata angle unsigned int idata amplitude Input Address pointer of touch wheel parameters wheel param 0 The parameters inclu
19. he Color Wheel board is in Color mode a touch detected by the touch wheel will adjust the color aspect The saturation and brightness aspects remain unchanged until the respective Saturation or Brightness mode is selected The three modes set the HSL Hue Saturation Lightness color space which is converted into RGB space which is fed into the RGB LED via 3 PWM signals The user can therefore adjust the light colors with the touch wheel and centre button Please refer to the Section 3 3 for more details The Color Wheel board can be switched off with a continuous press of the centre button 2s The On Off LED indicates the status When off the touch wheel is inactive Press the centre button again to turn the board on The current color mode selection is reset to Hue and the RGB LED is reset to the default value Application Note 6 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Implementation of Color Wheel Software 3 Implementation of Color Wheel Software The Color Wheel software enables some XC822T device functions such as Real Time Clock Power Down Mode and LEDTSCU for example When the Color Wheel board is turned off it actually enters Power Down Mode The device will wake up every 1 second for less than 500us to check if a touch is detected on the centre button If no touch is detected Power Down Mode is re entered When a touch is detected the device will initialize all parameters
20. ia USB to start up the board Open DAvE Bench XC800 FLOAD tool Device XC82x 1F Protocol UART Physical Interface Half Duplex set COM port Click on Connect button to connect UART BSL Mode P2 0 and P2 1 are controlled by XC800 FLOAD Device is in UART BSL Mode Notice that the On Off and color mode LEDs are off Click on Write User ID button to program BMI to UART BSL Mode Erase flash optional Open hex file and download code to Flash e Execute Flash and observe Color Wheel board Note Ensure that the access code to UART BSL Mode is included in code to allow future software updating Once the code is verified the user can re program the device to User Mode Productive Attention It is recommended to program BMI to UART BSL Mode before updating the software code This is a safer approach and it will ensure that the device can be accessed via UART BSL Mode at all times Only program the BMI back to User Mode Productive when the updated software code is proven to be working and is in a finished state 5 1 Access Code to UART BSL Mode In order to allow software updating the following code must be included in the user flash code at all times Soft reset triggered by external interrupt O low level triggered at P2 0 This emulates a Reset pin INT C Enter UART BSL Mode upon start up check P2 1 for low to enter UART BSL Mode MAIN C Note The 2 port pins are controlled by the XC800 FLOAD t
21. kspace Move ER i Rename F2 i e evs gt Refresh FS Run Debug Location C RGB_Wheel Browse E EN Convert Line Delimiters To gt T eund Iv Copy project into workspace 5 6 Print Ctrl F E Build Settings 188 Example Projects il gt Be cbe E 1 Bi Existing DAvE Project 3 estar i bei Existing Project oe oo r Export 2 lt Back N Cancel Properties Alt FEnter 2 EAR D Finish Cancel db XC800 Development RGB_Wheel MAIN C DAvE Bench for XC800 m ni x File Edit Navigate Search Project Debug Tools Window Help Irs m Brook e Project Ei B xC800 Develo Q T 2 sy Rebuild Active Project TUS Open Project Ud 4B e tS S Close Project t Ei C C Projects 53 bh i Build All Ctrl B ES Build Project E E RGB Wheel Active Buld Working Set x Clean EP Includes Build Automatically Debug Library Release BOOTROM ADDR s Properties CC6 C CC6 H INT C INT H LTS C LTS H MAIN C MAIN H Memlnitxc82x s PM C PM H RTC C MAIN Main 2 aram Compensation Whee Compensation Whee Amplitude Thresho Amplitude Filter gt Active Project Properties E unsigned int idata wheel amplitude 2 0x0 amplit Ampl EN be char idata wheel angle unsigned char idata wheel hue 0x00 unsigned char idat
22. of such components can reasonably be expected to cause the failure of that life support device or system or to affect the safety or effectiveness of that device or system Life support devices or systems are intended to be implanted in the human body or to support and or maintain and sustain and or protect human life If they fail it is reasonable to assume that the health of the user or other persons may be endangered e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation XC822T Revision History V1 0 2010 08 Previous Version s Page Subjects major changes since last revision This is the first release We Listen to Your Comments Is there any information in this document that you feel is wrong unclear or missing Your feedback will help us to continuously improve the quality of this document Please send your proposal including a reference to this document to mcdocu comments infineon com 57 Application Note 3 V1 0 2010 08 AP08113 au n fi n eon Capacitive Touch Color Wheel Implementation Table of Contents Table of Contents 1 1 3 1 3 1 1 3 1 2 3 2 3 2 1 3 2 2 3 3 3 4 4 1 4 2 5 1 6 1 6 2 6 3 6 4 6 5 6 6 Introduction liiiiillllsssseselll rr rre 5 OVerVIOW aan na TERN P P eke ede aw Rs 5 Color Wheel Features sss esed Rx ERR RERA AA POEMA Vo ea e ide p ema Vick 6 Implementation of Color Wheel Software
23. on Kit 1 The steps and software code are also applicable for other XC82x XC83x products that support capacitive touch control Application Note 5 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Color Wheel Features 2 Color Wheel Features The Color Wheel board starts automatically when the kit is plugged into computer via USB This is indicated by the On Off LED see LED4 in Figure 6 When a finger moves over the touch wheel the software detects the absolute position of the current finger touch and the color of the RGB LED D2 changes accordingly The effect of the finger position depends on the selected color mode There are three color modes available Color Hue e Saturation Sat Brightness Light The three color modes are represented by Hue Sat and Light markings on the top of the respective LEDs as shown in Figure 1 or LED3 LED2 and LED1 respectively as shown in Figure 6 The color modes can be selected by tapping the centre button Successive taps on the button cycle through the available color modes so the first tap selects Sat the second selects Light and the third selects Hue The respective LED above the touch wheel will indicate the current color mode selection The main LED is a 3 channel RGB LED D2 where the color is a combination of the three channels relative RGB values which are controlled by the PWM signals When t
24. ool to trigger a soft reset and to enter UART BSL Mode at next boot up Note The user can define specific conditions to program the BMI value to access to UART BSL Mode MAIN C void main void USER CODE BEGIN MAIN Main 2 if P2 DATAIN amp 0x02 amp amp P2 DATAIN amp 0x01 while j wait for FTDI device to enumerate and startup if P2 DATAIN amp 0x02 Only enter BSL in case MBC is low EA 0 disable interrupts NMICON 0x00 disable NMIs SP OxEO move stack pointer outside flash buffer BR UART BSL start UART BSL USER CODE END Application Note 15 V1 0 2010 08 e t AP08113 n fi n eon Capacitive Touch Color Wheel Implementation Downloading Modified Color Wheel Software Code MAIN vInit INT C void INT vInit void NMICON 0x00 NMI Control Register IENO 0x01 interrupt enable register 0 IEN1 0x00 interrupt enable register 1 EXICONO OxF3 External interrupt Control Register 0 I SFR PAGE su3 noSST switch to page 3 without saving MODPISEL1 0x18 peripheral input select register 1 SFR PAGE su0 noSST switch to page 0 without saving End of function INT vInit GI void INT viExtO void interrupt EXTOINT USER CODE BEGIN IR_IsrExt0 2 emulate Reset Pin an falling edge SFR PAGE sul noSST
25. saved The cycle then repeats If the SFR LTS_TSVAL value is less than or equal to the saved value it means that the centre button is being pressed therefore Power Down Mode is exited and the Color Wheel board will turn on On Off LED light turns on With above mentioned protocol timing to enter Power Down Mode is consistent while timing to exit Power Down Mode varies depending on when the user touches the centre button 6 3 CCU6 Module CCUG is used to control the color saturation and brightness level at RGB LED D2 RGB LED utilizes COUT60 P1 0 COUT61 P1 2 and COUT62 P0 5 for PWM control 6 4 Interrupt System Module External interrupt O P2 0 low level triggered is enabled This emulates a Reset pin If a negative edge is detected at P2 0 soft reset will be activated It is triggered by XC800 FLOAD tool to enter UART BSL Mode at next boot up Time Slice and Time Frame interrupts are also enabled to set up the configurations for LEDTSCU 6 5 UART Module UART module is enabled for debugging to transmit and receive data via P0 6 TXD RXD 6 6 LED and Touch Sense Controller Unit Module LEDTSCU module is used for touch sensing and driving the LEDs The configuration is 4 Touch Sense inputs P0 0 PO 1 PO 2 and P0 3 e 1 LED column P0 4 4 LED line pins P0 0 P0 1 PO 2 and P0 3 Application Note 17 V1 0 2010 08 Infineon 7 AP08113 Capacitive Touch Color Wheel Implementation Schematics and Layou
26. t of the Color Wheel Board Schematics and Layout of the Color Wheel Board Figure 6 shows the component layout of the Color Wheel board while Figure 7 Figure 8 and Figure 9 show the schematics of the XC822T device USB interface and power supply on the Color Wheel board respectively UDD a ovg a AJ N R6 z D2 LED4 LED3 LED2 LEDA a gt m HN Ni 2 ca ca R4 R3 R2 R1 R5 m IC1 A KJ ca C1 O c x UDD a on H e Ox Figure6 Component Layout of the Color Wheel Board a a Im IAS ions P E AES cr O4 ta FW los as eas l WY j z a a IC1 gt Qd tQ d eet B XC822T 1 tala zl orot 2 PO 0 T2 T1 SHR TA2HRMTSR MRST CCPOSO COUT61 TSINOILINEO P0 1 TU CC6 1 T13HF MTSR MRST CCPOS1 TSIN1 LINE1 PO 2 T1 0C62 SCLICCPOS2 TSIN2 LINE2 VDDCy P0 3 CC6O SDA CTRAP TSIN3 LINE3 Ct PO A T2EX SCL SCK EXINT1 CTRAP EXF2 COLA COLS COLO TSINA LINES j a C2 PO S EXINTO RXD TXD MTSR MRST COUT621EXF2 COL1 TSINSILINES a 220n gt OB er TXD RXD D2 0 Q PO G SPD EXINTO RXD TXD T2EX SDA MTSR MRST COLA COL2 TSING LINEG 12 23C RBGHBHC A01 2C G N GND m P1 0 SPDEXINTO RXD TXD T2EXCOUTE0COLO AST amp _ P2OANOEXINTOCCPOSO MTI2HATI3HRA T2EXT2 2 P4 Q EXINT4 COUT61 COUT6S COL2 MBC P2 4 AN1 EXINTI CCPOS1 RXD MTSR TO VDDC 4 P2 2 AN2 EXINT2X CCPOS2 T12HR T13HR SCK T1 3 P2 3S ANS EXINT3 CCPOSO CTRAP amp T2 Figure 7 Sch
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