ezDISPLAY 2.0 Serial Graphic LCD Module With
Contents
1. Received either an invalid command code or a value is out of range Typically luS Received last byte of Add Character command until an ACK is sent Typically 42 3mS Received last byte of Character Placement command until an ACK is sent Typically 6 8mS Received last byte of Download Screen data until an ACK is sent Typically luS Received last byte of Erase Area command until an ACK is sent Erase Area Minimum 258uS amp Maximum 875mS Whole Screen Typically 27mS Received last byte of Floating Character command until an ACK is sent User Control Typically 7 9mS Follow Touchscreen Latch to Touchscreen 50uS Received last byte of Get Touchscreen Data command until the first byte is sent Typically 558uS Receive last byte of Line command until an ACK is sent Minimum 150uS amp Maximum 10 8mS Receive last byte of Pixel command until ACK is sent Typically 126uS Received last byte of Retrieve Screen command until ACK is sent Typically 388mS Received last byte of Save Screen command until ACK is sent Typically 9S Received last byte of Touchscreen Calibration command until ACK is sent No set time is defined since it is based on the user Received last byte of Backlight command until ACK is sent 10uS Page 7 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Contrast Adjustment At the front of the module on the left hand side there is a small knob labeled CONTRAST T2. 113 42 B 66 Z 90 r 114 43 C 67 91 s 115 44 D 68 92 t 116 45 E 69 93 u 117 46 F 70 94 v 118 47 G 71 _ 195 w 119 0 48 H 72 96 x 120 1 49 I 73 a 97 y 121 2 50 J 74 b 98 z 122 3 51 K 75 c 99 123 4 52 L 76 d 100 124 5 53 M 77 e 101 125 6 54 N 78 f 102 126 T5 O 79 g 103 B27 All code values are in decimal LCD Screen Layout The ezDISPLAY 2 0 is setup as a true bitmap with no character cells or restrictions where anything can be placed This means that all the drawing and text commands require an X Y coordinate to tell the ezDISPLAY 2 0 where to draw The resolution of the ezDISPLAY 2 0 is 160 by 80 and is setup as follows Page 4 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Pizel 1 1 Prel 160 50 Figure 1 Figure shows the furthermost pixel locations The upper most left hand pixel has a coordinate of 1 1 and the lower most right hand pixel has a coordinate of 160 80 The X direction goes across the screen and has a value of 1 to 160 starting from the left hand side The Y direction goes from the top to the bottom of the screen and has a value of 1 to 80 starting at the top Touchscreen Calibration All resistive touchscreens need to go through a calibration when they are fitted to an LCD This process ensures that the touchscreen data is de
3. 4 This custom character would be defined by the follow values 60 66 165 129 165 153 66 and 60 Data is sent to the ezDISPLAY 2 0 from the top row to the bottom row Syntax code character byte 0 byte 1 byte 2 byte 3 byte 4 byte 5 byte 6 byte 7 e Code is the character that tells the ezDISPLAY 2 0 that this is an Add Character command This code is an A decimal value of 65 e Character is a value from 0 to 127 that tells the ezDISPLAY 2 0 which character to define e Bytes 0 7 are the eight bytes that make up the character bitmap They are sent to the ezDISPLAY 2 0 from the top byte to the bottom byte Page 10 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Backlight This command allows you to turn the LED backlight on and off Syntax code mode e Code is the character that tells the ezDISPLAY 2 0 that this is a Backlight command This code is a B decimal value of 66 e Mode tells the ezDISPLAY 2 0 what to do with the backlight 0 Off 1 On Page 11 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Character Placement This command places a character either built in or user defined on the screen The character can be placed in a variety of different ways depending on your needs The first option is the character can be placed in either landscape or portrait Figure 5 shows an A in landscape and figure 6 shows an A
4. ANY PERSON SHALL BE BINDING UPON MULTILABS OR MODIFY THE TERMS OF THE ABOVE WARRANTY AND DISCLAIMER IN NO EVENT SHALL MULTILABS BE LIABLE FOR SPECIAL INCIDENTAL CONSEQUENTIAL OR OTHER DAMAGES RESULTING FROM THE POSSESSION OR USE OF THIS PRODUCT INCLUDING WITHOUT LIMITATION DAMAGE TO PROPERTY AND TO THE EXTENT PERMITTED BY LAW PERSONAL INJURY EVEN IF MULTILABS KNEW OR SHOULD HAVE KNOWN OF THE POSSIBILITY OF SUCH DAMAGES Some states do not allow limitations on how long an implied warranty lasts and or the exclusion or limitation of damages in which case the above limitations and or exclusions may not apply to you You may also have other legal rights which may vary from state to state Page 24 Copyright Multilabs 2006 All rights reserved
5. position automatically The floating character has another special feature It can either be controlled by the user or it can be latched to the touchscreen and automatically controlled by the ezDISPLAY 2 0 When a floating character is latched to the touchscreen it will become visible when the touchscreen is pressed and removed when the screen in not being pressed While the touchscreen in being pressed the floating character position is automatically updated without any intervention The floating character will follow the stylus finger around the screen This makes a great visual indicator without any work on your part Regardless of the mode user controller or latched the floating character will automatically be turned off when any of the following commands are executed Erase Area only when the whole screen in erased an area erasure does not affect the floating character Retrieve Screen Download Screen and Touchscreen Calibration After these commands are executed the floating character will have to be turned back on if needed User Controlled Syntax code mode character x y e Code is the character that tells the ezDISPLAY 2 0 that this is a Floating Character command This code is an F decimal value of 70 e Mode tells the ezDISPLAY 2 0 how to work with the character 0 Off 1 On and under user control e Character is a value from 0 to 127 that tells the ezDISPLAY 2 0 which character to use e Xisavalu
6. 2 0 User Manual Limited Warranty Multilabs warrants to the original consumer purchaser of this product that for a period of 90 days from the date of purchase this product will be free from defects in material and workmanship and will perform in substantial conformity to the description of the product in this Owner s Manual This warranty shall not apply to defects or errors caused by misuse or neglect If the product is found to be defective in material or workmanship or if the product does not perform as warranted above during the warranty period Multilabs will repair it replace it or refund the purchase price The repair replacement or refund that is provided for above shall be the full extent of Multilabs s liability with respect to this product For repair or replacement during the warranty period contact Multilabs customer service by phone at 949 458 7625 or email at support multilabs net to receive a return authorization number and return instructions Limitations THE ABOVE WARRANTY IS IN LIEU OF AND MULTILABS DISCLAIMS ALL OTHER WARRANTIES WHETHER ORAL OR WRITTEN EXPRESS OR IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ANY IMPLIED WARRANTY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WHICH MAY NOT BE DISCLAIMED OR SUPPLANTED AS PROVIDED ABOVE SHALL BE LIMITED TO THE 90 DAYS OF THE EXPRESS WARRANTY ABOVE NO OTHER REPRESENTATION OR CLAIM OF ANY NATURE BY
7. 67 e Mode tells the ezDISPLAY 2 0 how to place the character There are eight modes 0 Landscape Regular Opaque 1 Landscape Regular Transparent 2 Landscape Reverse Opaque 3 Landscape Reverse Transparent 4 Portrait Regular Opaque 5 Portrait Regular Transparent 6 Portrait Reverse Opaque 7 Portrait Reverse Transparent e Character is a value from 0 to 127 that tells the ezDISPLAY 2 0 which character to display e Xisavalue from to 160 that indicates the starting x position on the screen e Y isa value from 1 to 80 that indicates the starting y position on the screen Page 13 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Download Screen This command allows the ezDISPLAY 2 0 to except screen data from an outside source The screen data is in the form of a continuous stream of 1600 bytes The bitmap of the ezDISPLAY 2 0 is laid out as 80 rows of 20 bytes as shown in Figure 8 cl a o gt wy A k oo mn om oy oy uw wy wo p na h i i i ao i a q uv q J 1 wv wv wv aw aw pH pH pH aw 1 pn 1 wv 1 1 R T ER BR RY RY RY BY BR RY BY RY BY EJ EJ BY BY BY BY olor a olraglrmaral a olraormarial a molaol a mola mol wa Figure amp Byte 0 of row represents the upper most left hand byte of the screen and is the starting position for the data stream The first byte of the data stream is placed there and the second byte
8. ates the starting y position on the screen X2 is a value from 1 to 160 that indicates the ending x position on the screen Y2 is a value from 1 to 80 that indicates the ending y position on the screen Page 18 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Pixel This command allows you to control individual pixels on the screen A pixel can either be turned on or off Syntax code mode x y e Code is the character that tells the ezDISPLAY 2 0 that this is a Pixel command This code is a P decimal value of 80 e Mode tells the ezDISPLAY 2 0 how to draw the pixel 0 Off 1 On e Xisavalue from 1 to 160 that indicates the x coordinate on the screen e Y isa value from 1 to 80 that indicates the y coordinate on the screen Page 19 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Retrieve Screen This command allows you to load one of the four saved screens in the non volatile memory to the LCD screen When this command is executed the entire screen is redrawn and all data on the current screen will be lost This command will also automatically turn off the floating character if it is on Syntax code screen e Code is the character that tells the ezDISPLAY 2 0 that this is a Retrieve Screen command This code is an R decimal value of 82 e Screen tells the ezDISPLAY 2 0 which screen to load and can be a value of 0 to 3 Page 20 Copy
9. coded correctly for a proper screen mapping The ideal is to have the touchscreen decoded so that it matches the LCD screen pixel for pixel Your ezDISPLAY 2 0 comes pre calibrated from the factory and more than likely another calibration will not be needed However if you find that the data from the touchscreen is grossly out of range then you can re calibrate the touchscreen at any time This is discussed in more detail in the Commands section of this manual A good test to perform to check for calibration accuracy is to latch the floating character to the touchscreen How to do this is also discussed in the Commands section of this manual Once this is done use a fine tipped stylus and move it around the entire touchscreen The upper left hand pixel of the floating character should closely follow where the stylus is touching There are many factors that can affect the calibration of the touchscreen Some common ones are voltage supplied and temperature For example if the touchscreen is calibrated with a 5VDC supply at room temperature about 25 C and then used in a very warm room 40 C the calibration will be off since the properties of the touchscreen will have changed with such a great temperature rise Also if the supply voltage is under or above the voltage it was calibrated at this will affect calibration as well If the touchscreen was calibrated at 5VDC and then the ezDISPLAY 2 0 is operated at 4 8VDC then the calibration wil
10. d if a ball point pen metal pieces sharp objects rough objects etc are used 5 Do not expose the touchscreen to direct sunlight for long periods of time Polyester film is used on the touchscreen and exposure to direct sunlight for long periods of time may cause discoloration Connections The SIP pins are marked on the unit to indicate the proper connections The connections are as follows when looking at them from left to right Pin 1 5VDC Input supply Pin 2 TTL Serial data from the ezDISPLAY 2 0 module Tx Pin 3 TTL Serial data to the ezDISPLAY 2 0 module Rx Pin 4 Supply ground Page 3 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Built in Character Set The ezDISPLAY 2 0 module comes with a standard ASCII character set of 96 characters These characters follow the standard ASCII codes values from 32 to 127 Below is a table of the characters and their codes For the bitmapped images of each character please visit our website at www multilabs net Character Code Character Code Character Code Character Code Space 32 8 56 P 80 h 104 33 9 57 Q 81 i 105 34 58 R 82 j 106 35 59 S 83 k 107 36 lt 60 T 84 1 108 37 61 U 85 m 109 amp 38 gt 62 V 86 n 110 139 63 W 87 o 111 40 64 X 88 p 112 41 A 65 Y 89 ql
11. damage and or affect device reliability The operational ratings should be used to determine applicable ranges of operation Storage Temperature 30 C to 80 C Operating Temperature 0 C to 70 C Supply Voltage Vcc 5VDC Voltages on Tx and Rx Pins 0 6VDC to Vcc 0 6VDC Characterisitic Symbol Min Typ Max Unit Supply Voltage Vcc 4 5 5 0 5 5 V Supply Current Backlight Off Icc 13 mA Supply Current Backlight On Icc 132 mA OPERATION BASICS Care of Touchscreen Before we get started here are some handling and operational guidelines that should be observed for the touchscreen Failure to follow these guidelines may cause permanent damage to the touchscreen 1 Prevent any liquids from coming into contact with the touchscreen The upper electrode film and lower electrode glass are fixed with adhesive and have vent holes between them Liquids may penetrate easily due to its structure A housing designed to prevent penetration would be required if used in a damp or moist environment 2 Do not stack or place anything on top of the touchscreen This may scratch the surface or cause a deformation to occur 3 Wipe off any dirt on the touchscreen with a dried flexible cloth Moist cloths and cleaning solutions should be avoided see item 1 4 Use a finger polyacetal pen a stylus such as those used on PDAs or other smooth objects on the touchscreen The surface of the touchscreen may be damage
12. e from to 160 that indicates the starting x position on the screen e Yisa value from 1 to 80 that indicates the starting y position on the screen Latched to Touchscreen Syntax code mode character e Code is the character that tells the ezDISPLAY 2 0 that this is a Floating Character command This code is an F decimal value of 70 e Mode tells the ezDISPLAY 2 0 how to work with the character 2 Off 3 On and under touchscreen control e Character is a value from 0 to 127 that tells the ezDISPLAY 2 0 which character to use Page 16 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Get Touchscreen Data Executing this command makes the ezDISPLAY 2 0 transmit the current X and Y touch position of the touchscreen The touchscreen is automatically read approximately 10 times a second Each time the ezDISPLAY 2 0 performs a touchscreen read the X and Y coordinate of the current touch position is stored in memory There is no buffer so the data is erased and updated on each automatic read The data is stored as a pixel position value The X coordinate will have a value of 1 to 160 and the Y coordinate will have a value of 1 to 80 The accuracy of this data depends on the object pressing the touchscreen For example a fine point stylus will be more accurate then a finger press When a finger presses the touchscreen the touchscreen read will read toward the center of mass This varies dependi
13. ezDISPLAY 2 0 Serial Graphic LCD Module With Touchscreen ae SOs ce ll le cle hee a Al ala A Ne Sele MULTILABS LAKE FOREST CALIFORNIA WWW MULTILABS NET 949 458 7625 ezDISPLAY 2 0 User Manual FEATURES e Easy to use 2 wire 9600 baud TTL level serial interface No external components needed 160 by 80 resolution Integral touchscreen for user feedback Graphic and text commands True bitmap with no character cells text can be placed anywhere on the screen Integral controller breaks down all LCD and touchscreen functions to simple commands Memory to save four screens Floating character for visual user feedback Built in ASCII character set font that can be changed by the user Memory for 32 user defined characters Characters can be placed in landscape or portrait Capabilities to download screens created on a computer LED Backlight DESCRIPTION The ezDISPLAY 2 0 is a serial LCD module with an integral touchscreen The LCD has a resolution of 160 by 80 pixels and can display both graphics and text The touchscreen is a resistive type screen such as the types used on PDAs and the like This allows the ezDISPLAY 2 0 to track the position of the touchscreen down to the pixel The integral controller breaks down the complex decoding operation of the touchscreen and returns a simple X and Y position The LCD is also provided with an LED backlight that can be turned on and off with a simple command The ezDISPLAY 2 0 comes with a comple
14. finger will result in an inaccurate calibration Once the screen is cleared a single pixel will be turned on in the upper left hand corner as shown in the following figure Figure 9 Press down on this point with your stylus The pixel will be cleared and when you lift your stylus off of the touchscreen a pixel in the lower right hand corner will be drawn Page 22 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Figure 10 Press down on this point with your stylus The pixel will be cleared and the ezDISPLAY 2 0 will calculate the calibration values If successful the ezDISPLAY 2 0 will send an ACK decimal value of 6 If the calibration could not be done then the ezDISPLAY 2 0 will send a NAK decimal value of 21 If this is the case then resend the calibration command and do it again Once done a good test to perform to check for calibration accuracy is to latch the floating character to the touchscreen How to do this is also discussed in the Commands section of this manual Once this is done use a fine tipped stylus and move it around the entire touchscreen The upper left hand pixel of the floating character should closely follow where the stylus is touching Syntax code e Code is the character that tells the ezDISPLAY 2 0 that this is a Touchscreen Calibration command This code is a T decimal value of 84 Page 23 Copyright Multilabs 2006 All rights reserved ezDISPLAY
15. his allows you to adjust the contrast of the LCD screen to best suit your operating conditions Rotate the knob clockwise and counter clockwise until the pixels that are on are clear and the pixels that are off are not visible Page 8 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual OPERATION COMMANDS Add Character This command allows you to define your own custom characters The character memory map is setup to allow 128 total characters Characters 0 through 31 are undefined and 32 through 127 are pre defined from the factory to a standard ASCII character Even though this command will allow you to define custom characters from 0 to 31 you can also change characters 32 through 127 This allows you to define custom fonts or replace ASCII characters that will not be used with custom characters In any case each character is 8 by 8 pixels To create a customer character you first draw the image that you want in the 8 by 8 matrix Once you have what you want you have to determine a value for each of the eight rows At the bottom of each column there is a number starting at 128 under the left most column These numbers represent the value of each pixel that is turned on in that row To get the byte value for a row you add up all the values for each pixel that is turned on For example Page 9 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual 126 264 32 l 8 4 2 1 Figure
16. in portrait Figure 5 Figure 6 Whether in landscape or portrait a character can be placed in regular mode as shown in the previous figures or in reverse mode as shown in Figure 7 Page 12 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Figure 7 A character can also be placed as an opaque or as a transparent When a character is placed as an opaque all the pixels are drawn The pixels that are off are turned off and the pixels that are on are turned on When drawn this way a character will completely overwrite whatever it is placed over When a character is placed as a transparent then the pixels that are off are not drawn Only the pixels that are on are drawn This allows you to place a character over a background and the background will be visible through the off pixels of the character Regardless of the options all characters are placed as a true bitmap The ezDISPLAY 2 0 has no character cells any character can be placed anywhere on the screen When placing a character you give the ezDISPLAY 2 0 an X and Y coordinate This coordinate is the starting position of where the character will be drawn This coordinate represents the upper left hand pixel of the character being placed whether landscape or portrait Syntax code mode character x y e Code is the character that tells the ezDISPLAY 2 0 that this is a Character Placement command This code is a C decimal value of
17. is placed at byte 1 of row 1 The bytes are continually placed next to each other down the row When byte 19 of row 1 has been placed then the next byte is placed in position byte 0 of row 2 Row 2 is filled left to right and then row 3 all the way until Byte 19 of Row 80 which is the 1600 and last byte of the data stream The screen is drawn as the data is received so anything current on the screen will be erased This command will also automatically turn off the floating character if it is on Syntax code bytes 0 1599 e Code is the character that tells the ezDISPLAY 2 0 that this is a Download Screen command This code is a D decimal value of 68 e Bytes 0 1599 are the bytes that make up the screen data They are sent to the ezDISPLAY 2 0 from the upper left hand byte to the lower right hand byte Page 14 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Erase Area This command is used to either erase a portion or the entire screen When an area is erased all the pixels in that area are turned off In the case of erasing the entire screen the whole screen is cleared When the entire screen is erased the ezDISPLAY 2 0 will automatically turn off the floating character if it is on The floating character is not affected for an area erasure The area to be erased is defined by two coordinates that make up a square rectangular area The upper left hand corner of the area is defined as X1 Y1 and the lo
18. l be off For a good calibration Page 5 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual the floating character should be within 1 or 2 pixels of the stylus Again for the most part if the ezDISPLAY 2 0 is used in normal room temperatures and a well regulated 5VDC supply is used then recalibration should never be needed If the ezDISPLAY 2 0 is going to be used in a different type of environment then it should be re calibrated within that environment IMPORTANT It is also recommended that a fine point stylus be used for calibration Using a device with a broad point or a finger will result in an inaccurate calibration Communications Protocol Communications are done through the TTL level Tx and Rx asynchronous data lines The protocol is 9600 baud with 8 data bits 1 stop bit and no parity The amount of data sent to the ezDISPLAY 2 0 is dependant on the command Data is sent to the ezDISPLAY 2 0 one byte right after another with no delay Once the proper amount of data has been received by the ezDISPLAY 2 0 it will be analyzed and executed and either an ACK decimal value of 6 or NAK decimal value of 21 will be returned The only exception to this is when the command for reading the touchscreen is sent Instead of an ACK being sent the ezDISPLAY 2 0 will send two bytes of data Refer to the Commands section in this manual for information on the data that is sent The ezDISPLAY 2 0 will NAK a com
19. mand if one of the values is out or range or a command code is not recognized For the amount of time it takes for the ezDISPLAY 2 0 to send a NAK see the Timing section in this manual If the command code is recognized and all the values are within range then the command will be executed and an ACK will be sent once completed Again for the amount of time it takes for the ezDISPLAY 2 0 to send an ACK see the Timing section in this manual Another command should not be sent to the ezDISPLAY 2 0 until the ACK is received Sending another command before the ACK is received might result in unexpected or incorrect operation Timing When the last byte of a command is sent to the ezDISPLAY 2 0 an ACK or NAK will be returned as discussed in the Communications Protocol section The only exception to this is when the command for reading the touchscreen is sent Instead of an ACK being sent the ezDISPLAY 2 0 will send two bytes of data Refer to the Commands section in this manual for information on the data that is sent The following is a timing diagram Figure 2 followed by the timing values of the ezDISPLAY 2 0 Figure 1 is valid for all timing values except for startup which is typically 91mS ta ta o E Om ow u y y y A nee ee FP ee eo Foe hw Ww Blam a Ye T diy ezDISFLAY Response Figure 2 Page 6 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Values for Tdly Sends an NAK
20. ng on the finger used the force of the press how the finger is placed on the touchscreen ect The accuracy you need depends on your application For example if drawing virtual buttons on the screen for a user to press then they should be made big enough to accompany a wide range of finger sizes and press forces When this command is executed you will receive two bytes from the ezDISPLAY 2 0 The first is the X coordinate value of 1 to 160 and then the Y coordinate value of 1 to 80 If you receive a 0 0 this indicates that the touchscreen is not currently being pressed Syntax code e Code is the character that tells the ezDISPLAY 2 0 that this is a Get Touchscreen Data command This code is a G decimal value of 71 Page 17 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Line This command allows you to draw straight lines either horizontally or vertically When drawing horizontally both the Y1 and Y2 values must match When drawing vertically both the X1 and X2 values must match Lines can be drawn both on visible and off for erasing a line Syntax code mode x1 yl x2 y2 e Code is the character that tells the ezDISPLAY 2 0 that this is a Line command This code is an L decimal value of 76 e Mode tells the ezDISPLAY 2 0 how to draw the line 0 Off 1 On X1 is a value from 1 to 160 that indicates the starting x position on the screen Y1 is a value from 1 to 80 that indic
21. right Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Save Screen This command allows you to save the current LCD screen to one of the four screen pages in the non volatile memory Syntax code screen e Code is the character that tells the ezDISPLAY 2 0 that this is a Save Screen command This code is an S decimal value of 83 e Screen tells the ezDISPLAY 2 0 which screen page to save to and can be a value of 0 to 3 Page 21 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Touchscreen Calibration The touchscreen comes pre calibrated from the factory so you will probably never need this command However if you find the reported touchscreen positions grossly inaccurate or the ezDISPLAY 2 0 is going to be used in an extreme environment you can use this command to re calibrate the touchscreen The calibration data is stored in non volatile memory and is automatically loaded when power is applied When you send the command to the ezDISPLAY 2 0 to enter calibration mode the entire screen is cleared the floating character is turned off if on and the automatic touchscreen readings are suspended Since the screen is cleared during this command all screen data will be lost It should be saved to one of the screen memory pages if you need to get it back IMPORTANT It is recommended that a fine point stylus be used for calibration Using a device with a broad point or a
22. te built in ASCII character set and a generous amount of memory to create 32 user defined characters All user defined characters are stored in non volatile memory so they are not lost when power is removed Memory is also provided to store up to 4 screens that can be re loaded at any time Again these saved screens are stored in non volatile memory Characters and graphics can be inter mixed on the screen and characters can be placed in landscape or portrait along with other options The ezDISPLAY 2 0 even has a command that allows downloads of screens from other sources such as those drawn on a computer The ezDISPLAY 2 0 comes with a floating character that makes a great companion to the touchscreen The floating character can be displayed and moved around anywhere on the screen without destroying any of the image on the LCD This adds another level of character display to the ezDISPLAY 2 0 The floating character can either be controlled by the end use controller or it can be latched to the touchscreen so it automatically follows the movement of the user stylus or finger The ezDISPLAY 2 0 comes with four mounting holes for secure placement A 4 pin header is used to supply power and access the serial data lines Page 2 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual SPECIFICATIONS Absolute Maximum Ratings Note These are stress ratings only Stresses above those listed below may cause permanent
23. wer right hand corner is defined as X2 Y2 Area Syntax code mode x1 yl x2 y2 e Code is the character that tells the ezDISPLAY 2 0 that this is an Erase Area command This code is an E decimal value of 69 Mode is 0 and tells the ezDISPLAY 2 0 just to erase an area and not the whole screen X1 is a value from 1 to 160 that indicates the starting x position on the screen Y1 is a value from 1 to 80 that indicates the starting y position on the screen X2 is a value from 1 to 160 that indicates the ending x position on the screen Y2 is a value from to 80 that indicates the ending y position on the screen Whole Screen Syntax code mode e Code is the character that tells the ezDISPLAY 2 0 that this is an Erase Area command This code is an E decimal value of 69 e Mode is and tells the ezDISPLAY 2 0 to erase the whole screen Page 15 Copyright Multilabs 2006 All rights reserved ezDISPLAY 2 0 User Manual Floating Character This command enables you to draw a character that will float over the other characters and graphics on the screen without erasing or disturbing them This character is special in that it can be changed on the fly with a single command To move this character or change its appearance it is not necessary to clear it first the ezDISPLAY 2 0 takes care of this for you Just send the new information and the floating character will be removed from its old position and drawn in the new
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