# UART TFT LCD is an intelligent LCD module with touchpad, built
Contents
1. Interface set Pins Signals 1 0 Functional Description 1 GND Power Ground UART Bypass 2 UART Output UART data output bypassed when LCD Select optional Bypass signal is LOW 3 Reset Input Reset the device active low internally pull up to 3 3V i 4 Touchpad Output ILOW when touchpad is pressed otherwise HIGH Full wire LCD Interrupt control interface Gnoma 5 LCD Busy Output LOW when LCD is busy otherwise HIGH optiona j Instructions should not be sent to LCD when LOW 6 LCD Select Input Enable the LCD start receiving data from Rx active HIGH required for full wire interface GND Power Ground UART LCD control LCD Tx Output UART data transmitted by LCD interface LCD Rx Input UART data received by LCD external wireless 10 3 3V Power 3 3V input or 3v3 output when 5V is connected interface Input O Warning never try to connect 5V source to this utput linput even though there is protection 11 Gnd Power Ground Power input 12 5V Power 5V input Input Page 3 UART TFT LCD user manual Hardware specifications e 2 8 inch 65k color TFT LCD with resistive touchpad e Mini USB 1 1 connection for image transfer e Standard 2 54mm input output header e Atmel ATmega microcontroller e 32Mbit serial flash 12bit touchpad controller input output buffer e 80mmxX65mmxX5mm e Optional acrylic frame for holding the LCD module Package Conten2. This command is used to display 16bit raw color data to the LCD After setting the LCD area and the writing direction command each color pixel can be sent to the LCD in this command sequentially and displayed to the LCD Therefore the host can directly send image information for the LCD to display instead of drawing the image Page 23 UART TFT LCD user manual from the flash memory The packet size this is the total no of bytes in this packet that is the length of pixel data 4 bytes ie This value will be 704 for the pixel data of 700 bytes The maximum size of the packet data is 700 bytes Therefore it can hold 350 pixels of 16bit color value each For example to display a icon of 24x24 pixel directly from host it can be splited into three packets 1 Use the LCD set area command to set a rectangular frame of 24x24 pixel X0 0 Y0 0 X1 23 Y1 23 2 Using the display raw data command send the first 350 pixels The sequence of pixel should be sent in according to the writing direction as set by the command LCD set writing direction 3 After the first 350 pixels are sent the LCD will immediately display these 350 pixel partially displaying the icon 4 Afterwards the remaining 226 pixels are sent in another packet the whole icon will then be displayed a total of 24x24 576 pixels For detailed example of this command please see the c application code displaying image to the LCD directly fr
3. The quick brown fox jumps over the lazy dog Touch coordinates LCD OK Corner 0 Onewire 1 Enable Checksum 0 Page 35 UART TFT LCD user manual t Now you can check the functions by clicking the button 1 Clear screen with random color the LCD will be filled with random color 2 Draw Text the text in the text box will be drawn to the LCD 3 Get Touchpad information This will show the Touch coordinates on the LCD Press once more to cancel the operation 4 Press TEST this will show some random numbers to the LCD When the LCD is touched the coordinates will be retrieved be the application and displayed in the application window Press once more to cancel this demo 5 Press Display image and select a 320x240 in the application s image folder The image will be drawn directly to the LCD Yes it is slow because the baud rate is only 38400 6 Wait after the image is completely shown then press display time This will create a clock This demonstrate drawing bitmap character to the LCD with this you can display text COM15 of any language fonts size to the EiL LCD in a much faster rate when MOn aE enable checksum Opened 38400 compared to drawing a text image Display Image Send Clear Screen with pixel data Random color Get LCD info 7 Demo is finished have Fun The Display Time Send Get touchpad dot data application and th
4. 3 CD IBusy gt ae ae ae a1 LCD Select a3 ij GND ET LCD Transmit Tx ET LCD Receive Rx tan 3 3V I GN i lI 5V I Th hy I I T niego Single wire mode Green only a I Full wire mode optional Green and Blue Gnd 5V Power Red and Black UART RX TX See GPIO Header GPIO Header GPIO Header UART TFT LCD can be connected to the onboard UART on Raspberry Pi dev ttyAMAO on the GPIO headers or USB to Serial device dev ttyUSBO Connection in single wire mode is demonstrated by the green wires Connection In full wire mode optionally is demonstrated by blue wires GPIO pins to control LCD select and input of LCD Busy With the LCD module information of the Raspberry Pi can be displayed and therefore you can leave your main monitor shut off or unconnected especially useful in server environments The touchpad can also serve as a simple input system to R Pi A simple python script Linux using Pyserial and psutil is included in the download package to demonstrate turning the LCD into a colored system information gadget displaying R Pi hardware status such as CPU usage network utilization memory usage etc Page 11 UART TFT LCD user manual Wireless Implementation between LCD and host Wired UART transmission can be replaced by wireless Bluetooth UART transmission module Therefore host can display information to the LCD which is placed remotely and the host can also respond to inputs ac
5. USB Onscreen touchpad and on board 12bit touchpad controller touch coordinates can be retrieved and sent to host via UART for input processing Support single wire mode only one wire data connection is required or full wire mode two wire data connection is required Auxiliary pin for full LCD control LCD busy Touchpad Interrupt LCD reset Wireless booth module upgrade reserved on the PCB remote display and control of host can be achieved using Bluetooth wireless UART transmission and one wire data mode Only send simple command to display text image or to control the LCD No low level LCD control and data transfer are required Support advanced function like drawing image and bitmap character directly via UART data transmission LCD brightness orientation writing direction can be fully controlled UART baud rate can be set through software up to 500000bps UART data which is not sent to the LCD will be bypassed to other device so that you can still use arduino s only UART to communicate with other device On board input buffer all inputs are tested 5V 3V tolerant no 5V gt 3V conversion is required Multiple LCDs can be displayed simultaneously by the same host by joining the host UART Transmit signal Bo Page 2H UART TFT LCD user manual Hardware information GND UART Bypass RESET Touchpad Interrupt ICD Busy LCD Select GND LCD Transmit Tx LCD Receive Rx 3 3V GND 5V
6. image for display during UART command After confirmation Press Write the image will be written to the flash The image will be automatically added to the Image List Pressing the save image list will save the images list and their sector information to the serial flash so that next time when you want to import images to the device you 36 x 36 2600 bytes size written to flash 033 jpg Sector 256 to 256 Destination Sector start address 256 Display image for above oe Write Add to imagelist Abort writing written image record 160 x 120 38408 bytes size written to flash 18 PNG Sector 256 to 265 Destination Sector start address 2 5 6 will know how many images and their sector location is then you can find free consecutive sectors to write further images Page 6 UART TFT LCD user manual t Connection Mode There are two connection mode for the LCD moduel and their connection mode can be set in the software LCD Select Required Full wire Rx Required mode Tx Required when touchpad is used Rx Required Tx Required when touchpad is used Single wire mode single wire mode uncheck In this mode at least two data signal are required to control the LCD Rx and LCD select To write command to the LCD first assert LCD select LOW and then write command to the LCD after finish writing the command assert LCD select HIGH LCD module will process
7. the command In this mode any UART data received when LCD select is HIGH will not be processed by the LCD and will be bypassed to the bypass out pin Therefore other devices can share the same UART data issued by the host Similarly when LCD select is LOW UART data received will be processed by the LCD and won t be bypassed to the UART bypass out pin This is designed as most arduino has only one UART interface and to send UART data to multiple devices Single wire mode single wire mode checked In this mode only Rx pin is required to control the LCD The signal on the LCD select pin will be ignored This mode is suitable for USB gt UART module without GPIO pins or other flow control pins This mode is also suitable for connecting external wireless UART module of which only Rx and Tx is available for UART transmission The following pins are optional and are usable in both mode Tx pin This is used to transmit data from the LCD to the host This pin Page 7 UART TFT LCD user manual is used to send touchpad coordinates to the host for processing after receiving the Get touchpad command If touchpad input is not used this Tx pin can be left unconnected LCD busy pin This pin is used to signal the host whether the LCD is busy and is not accepting command Active LOW If the host send command to the LCD when it is HIGH command may not be processed If this pin is left unconnected appropriate delay is needed between c
8. 255 the checksum will be the remainder divided by 256 remainder of 36 16 255 255 256 50 6 Send byte 160 First end byte 7 Send byte 157 Second end byte Page 15 UART TFT LCD user manual t Command definitions Enquire LCD status Decimal 15 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and 5 and 7 and 9 and11 and13 15 Enquire LCD Status 15 If LCD is ready and idle it will return 9 bytes Byte1 120 Byte2 79 ASCII char O Byte3 75 ASCII char K Byte4 13 Byte5 10 ASCII line break CR Byte6 LCD orientation setting Byte7 One wire mode enabled Byte 8 checksum enabled Byte 9 136 ASCII will read OK Clear Screen Dec 16 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and 5 and 7 and 9 and11 and13 15 Clear Screen 16 Color Clear the whole screen with to the color sent Draw Rectangle Dec 17 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and 5 and 7 and 9 and11 and13 15 Draw 17 Color XO YO X1 Y1 Rectangle Draw a solid rectangle can be simulated as a button for touchpad X0 YO will be the coordinate of the upper left corner of the rectangle X1 Y1 will be the coordinate of the lower right corner of the rectangle Draw Box Dec 18 Byte1 Byte2 a
9. 6TE 0 euIp4002 X pIjeA oOLZP S A I JLEIIH A o Dg w O cc DS ke Qa o e bas T io U pI i v gt gt v g 5 p fa O U eS mS NG o gt o aa JA UART TFT LCD adl L4L LYYN Page 29 UART TFT LCD user manual Colour information The LCD module is a 16bit colour module The colour of each pixel is represented by a 16bit 2 byte information in the format of RRRRRGGGGGGBBBBB The colour of some basic colour is as follow 0x0000 Black OxFFFF White OxBDF7 Light Gray Ox7BEF Dark Gray OxF800 Red OxFFEO Yellow OxFBEO Orange 0x79E0 Brown 0x07E0 Green Ox07FF Cyan 0x001F Blue OxF81F Pink For other color values there is a simple conversion tool in the main Image loader application Page 30 UART TFT LCD user manual Font Information The font included in the module has 10 font sizes The font number and their respective font size pixel in height are shown below When using the Draw text or Draw test from text buffer command be sure the total font height is less than the rectangular frame Y1 YO The text will not be displayed if it falls out of the rectangular frame font no Font Height in pixel 1 13 2 15 3 19 4 22 5 28 6 34 7 43 8 56 9 74 10 112 Page 31 UART TFT LCD user manual Arduino library examples A Demo application File gt Exam
10. Page 22 UART TFT LCD user manual This command is used to set the direction of pixel drawing The default value for direction is horizontal writing In horizontal writing pixel will be drawn in the increment of X then Y In the vertical writing pixel will be drawn in the increment of Y then X This command is used to set the pixel direction direction to suite the display data issued by the command display dot data horiztonal value 1 vertical value 0 Set LCD Area Dec 50 Byte1 Byte2 and 3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 Byte16 and5 jand7 and9 and11 and13 and15 and 17 50 Background XO YO X1 Y1 Font Color Color Set Area This command must be issued to set the area of pixel display before the command display dot data or display raw data It set an imaginary rectangular frame within the LCD and the pixel will be drawn within this imaginary frame The pixel drawing direction can be set by the command Set writing direction Background and font color information are set and used in conjunction with command display dot data Display raw data Dec 51 Byte1 Byte2 and 3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 Byte16 and and5 and7 and9 and11 and13 and15 17 Display 51 Packet Size Pixel data raw data bytes Pixel 1 Pixel 2 Pixel 3 Pixel 4 Pixel 5 Pixel 6 Pixel 7 and so
11. UART TFT LCD user manual Racrberry Pi 120 110 1 UART TFT LCD is an intelligent LCD module with touchpad built in controller and flash memory The LCD module is controlled through UART serial communication Traditionally driving a TFT LCD with a touchpad is complicated using at least 24pins from controllers and involve extensive programming this LCD module is designed for users to enjoy the colour and resolution of TFT LCD without programming and messy wires connection Controlling the LCD and touchpad is extremely simple and libraries are included Besides arduino this LCD module support all controlling host with UART serial transmission such as microcontrollers PC with windows or linux with USB to Serial UART controller Rasberry Pi etc This module is also tested on Bluetooth wireless UART transmission which means remote display and control of host can be accomplished Top UART TFT LCD controlled by Raspberry Pi as system information gadget Left UART TFT LCD controlled by arduino as a color LCD clock Page 1 UART TFT LCD user manual Features On board 2 8inch 320x240 TFT LCD module supporting 65k color On board 32MBit serial flash for storing fonts images and icons USB 1 1 connection with software for Windows to import images to serial flash for display Built in fonts with 10 different sizes with extended ASCII characters extra user s fonts can be downloaded to flash memory via
12. age Start XO YO from flash sector 33 Background Font XO YO X1 Y1 Font Text Start Draw Text Color Color number Set LCD 48 Brightness brightness value Get Touch 54 pad value 7 bit Common Value definitions Color format Color used is a 16bit double byte RAW format 0 65535 RRRRRGGGGGGGBBBBB Please refer to color palette for color representation Less commonly used color can be converted to 16 bit value using Image loader software Coordinates format X Y X is the horizontal axis from corner 0 0 while Y is the vertical axis from corner 0 0 For the corner representation see orientation section For example Clear the screen in White Full wire 1 Wait for LCD Busy to be HIGH 2 Assert LCD Select LOW 3 Send byte 36 Start byte Page 14 UART TFT LCD user manual Send byte 16 command Clear Screen Send byte 255 Higher byte of 65535 65535 is the 16bit color value of White Send byte 255 Lower byte of 65535 65535 is the 16bit color value of White Assert LCD Select HIGH SO gt Single Wire Send byte 36 Start byte Send byte 16 command Clear Screen Send byte 255 Higher byte of 65535 65535 is the 16bit color value of White Send byte 255 Lower byte of 65535 65535 is the 16bit color value of White Send byte 50 Only if checksum is enabled Calculation of byte checksum oe ee Sum of all the bytes in the packet before this checksum byte If the result is greater than
13. ced Command list These commands can be used to extend the display capabilities of the LCD Module Byte1 Byte2 and 3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 Byte16 and5 and7 and9 J and11 jand13 and15 and 17 Draw Pixel 21 Color XO Yo yah Fill Text 34 Background Font XO YO X1 Y1 Font Text buffer1 Color Color number Start Fill Text 35 Background Font xO YO X1 Y1 Font Text buffer2 Color Color number Start Fill Text 36 Background Font xO YO X1 Y1 Font Text buffer3 Color Color number Start Fill Text 37 Background Font X0 Yo X1 Y1 Font Text buffer4 Color Color number Start Display 38 JO 0 Display Display Display Display Text in Buffer 1 Buffer 2 Buffer 3 Buffer 4 buffer Set Writing 49 Direction direction 50 Background XO YO X1 Y1 Font Set ATeA Color Color Display raw 51 Packet Size Pixel data data bytes Display 52 Packet Size Dots data dots data bytes Get Touch 56 pad value 12 bit Page 21 UART TFT LCD user manual t Draw Pixel Dec 21 Byte1 Byte2 and Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 Byte16 3 and5 and7 and9 Jand11 jand1i3_ and15 and 17 Draw Pixel 21 Color XO YO This command will draw one single pixel at the coordinate X0 YO on the LCD with the co
14. ched coordinates and trigger downstream activities Are all the inputs 5V tolerant Yes All the inputs are 3 3V and 5V tolerant as there is an on board input buffer Arduino can be connected directly to the module without any 3 3V logic level conversion The bypass output and other output pins are 3 3V 0V logic level and is compatible with a 5V arduino system Why I cannot upload sketch to arduino when arduino s Rx is connected to UART TFT Module Arduino IDE software upload sketches to arduino via UART If arduino s Rx is connected to UART TFT Module there will be traffic collision Two UART signal is transmitted to arduino s Rx Therefore after disconnecting Rx connection to the module sketches can be uploaded to arduino normally Arduino s Tx to TFT module do not need to be disconnected for successful upload as arduino s Tx can be connected to multiple inputs Page 28 UART TFT LCD user manual LCD Module Orientation The LCD module can be set in different orientation to suite user s display orientation It can be set in the Image loader application The default orientation is 0 For each orientation the coordinate maximum X and Y value may be different and shown below 6 C 0 ajyeulpsood pijen 6TE 0 2euIp1002 X pIJeA UART TFT LCD 08T p S1 A 1 EJUOZIJOH Horizontal upright 0 valid x coordinate aol 141 LYVvn 0 319 valid y coordinate 0 239 6EZ 0 ajeulpso0od pijen
15. command will be ignored X0 YO is the coordinate of the upper left corner of the image drawn Set LCD brightness Dec 48 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and 5 and 7 and 9 and11 and13 15 Set LCD 48 Brightness Page 18 UART TFT LCD user manual t brightness value Set the brightness value of the LCD 0 255 0 is the dimmest 255 is the brightness Get touchpad value 7bit Dec 54 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and 5 and 7 and 9 and 11 and13 15 Get Touch 54 pad value 7 bit This command will return 6 bytes within 5ms after the command is processed Byte1 Firmware version 0 78 Byte2 Touchpad coordinate X 0 127 Byte3 Touchpad coordinate Y 0 127 Byte4 Touched 0 untouched 1 touch detected Byte5 Byte Checksum of Byte2 3 and 4 Byte6 88 If Touchpad interrupt is unconnected host can poll this command periodically to check whether the touchpad is touched touched coordinates can also be obtained at the same time Draw Text Dec 33 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and 5 and 7 and 9 and 11 and13 15 so on 33 Background Font XO YO X1 Y1 Font Text Start Draw Text Color Color number This command will draw text according
16. ction can also be customize to suite the character render direction Characters of any language can be displayed to the LCD The C application has an example and library to convert text of any languages in Arial Unicode MS or other font type to packets of dot data and displayed to the LCD Get Touch pad value 12 bit Dec 56 Byte 60 66 129 128 128 135 129 129 67 61 Byte1 Byte2 and 3 Byte4 Byte6 and5 and7 Get Touch 56 pad value 12 bit Byte8 Byte10 Byte12 Byte14 and9 and11 and13 and15 Byte16 and 17 This command will return 8 bytes within 5ms after the command is processed Bytel 78 Byte2 3 Touchpad coordinate X 0 4096 Higher byte first Byte4 5 Touchpad coordinate Y 0 4096 Higher byte first Byte6 Touched 0 untouched 1 touch detected Byte7 Byte Checksum of Byte2 3 4 5 and 6 Byte8 88 Page 25 UART TFT LCD user manual t If Touchpad interrupt is unconnected host can poll this command periodically to check whether the touchpad is touched touched coordinates can also be obtained at the same time Page 26 UART TFT LCD user manual FAQ 1 What is the font included The font included in the module is Bit Stream Vera Sans It is a free to use font 2 What is the recommended baud rate setting The default baud rate is 38400bps and is already fast enough for command and text transfer If display raw data o
17. dy to receive another command Assert LCD_select Send UART Assert LCD_busy command LCD_select becomes HIGH HIGH LOW Kelp LCD ready Aitan process te accent completed eae P LCD_busy d another pees an command display to LOW LCD Flow control for fullwire mode In the single wire mode the signal on the LCD select pin will be ignored and LCD will continuously receive UART data and scan for a packet Packet Format Full wire mode Start byte Command and Decimal 36 data bytes Single wire mode without checksum Single wire mode with checksum Start byte Decimal Command and First End byte Second End data bytes checksumibyte Decimal 160 byte Decimal 157 If the checksum is enabled the host should send the packet checksum value just before the two end bytes The LCD module will process the packet only if the checksum is correct Page 13 UART TFT LCD user manual t Basic Command List Byte1 Byte2 and 3 Byte16 and 17 Enquire LCD 15 Status Clear Screen 16 Color Draw 17 Color X1 Y1 Rectangle Draw Box 18 Color XO Yo X1 Y1 Box Width Draw Circle 19 Color XO Yo Circle Fill radius Circle Draw Triangle 20 Color XO YO X1 Y1 X2 Y2 Draw 22 Background Bar XO YO X1 Y1 Percenta Gradient progress bar Color Color ge Value Draw Line 23 Color XO Yo X1 Y1 Line Width Draw Image 32 im
18. e C driver is coordinates 12bit open sourced feel free to create r TEST your own application using the LCD using these information provided The quick brown fox jumps over the lazy dog Touch coordinates X 154 Y 136 Page 36 UART TFT LCD user manual Snaps from PC demo application a zt Jey vip BPeN 12 45 15 0 106 V 0 285 V 009V O LV 0 69 V 0 639 V Page 37 UART TFT LCD user manual UART TFT LCD Front View and dimension D 3 2mm WILUQS 78mm Page 38 UART TFT LCD user manual Disclaimer e Fonts used in LCD sys info is Bitstream Vera Sans It is a free to use font e Information in this manual may contain technical inaccuracies or other kind of error and also subjected to changes e Avoid contact with PCB of any kinds as such may damage the device Coldtears electronics is not responsible for any consequence or damage arised from using this device About us Coldtears electronics specialized in providing TFT LCD modules for embedded systems We create TFT LCD products which is unique and innovative We also design applications using TFT LCD for customers to suite their specific needs For interesting products please visit our ebay store at and our webpage http stores ebay com coldtearselectronicsstore htto www coldtears com electronics UART TFT LCD Manual rev A Copyright coldtears electronics 2012 Page 39
19. it optional 4 Software used Python script using Pyserial and psutil Code please see rpi uarttftlcd py Raspberry Pi CPU24 Mem18 2 0 255 0 Raspberry Pi m Pus cn oO Left Wireless version Right Wired version USB to UART converter optional when not using onboard UART Raspberry Pi CPU36 Mem18 2 om CPU4LA Mem 18 6 Touch detected and coordinates shown in the lower right corder white word Page 34 UART TFT LCD user manual t Windows C demo application The next step of the guide is to control the LCD using PC running in windows This application can demonstrate some advanced functions of the LCD To connect the LCD to PC you need a USB to serial adapter or a serial port in a PC Note A USB to serial adapter with 5V or 3V TTL level but not 12 12 RS232 level Connect 4 wires Tx Rx Power and GND This demo operate in single wire mode After connection launch the UART TFT LCD demo application in the UART TFT LCD demo folder After that select your COM port baudrate to 38400 check one wire mode and uncheck enable checksum and press Open If everything is OK it will show LCD OK and all the buttons will be enabled a UART TFT LCD demo 38400 V One wire mode E enable checksum Opened 38400 Display Image Send R pixel data Get LCD info Display Time Send Get touchpad dot data coordinates 12bit
20. lor specified To make sure pixels are drawn use the LCD Set area command to set the area of the display to include the coordinate of the single pixel before issuing this draw pixel command Fill Text buffer Dec 34 37 Byte1 Byte2 and 3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 Byte16 and5 jand7 jand9 and11 and13 and15 and 17 Fill Text 34 35 36 Background Font XO YO X1 Y1 Font Text Start buffer or 37 Color Color number There are four text buffers which can store the text and its relevant information on the LCD module They can be filled with command 34 35 36 and 37 for buffer 1 2 3 and 4 respectively The character of the text to be filled in the buffer should not be greater than 40 characters This command only store text and their display information in the buffer but will not display to the LCD Display text from text buffer Dec 38 Byte1 Byte2 and 3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 Byte16 and5 jand7 jand9 and11 and13 and15 and 17 Display 38 0 0 Display Display Display Display Text in Buffer Buffer Buffer 3 Buffer 4 buffer 1 2 This command can be used to draw the text in the 4 text buffers Each text buffers can be drawn individually to the LCD 0 will not draw the text 1 will draw the text to the LCD Set writing direction Dec 49 Byte1 Byte2 and 3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 Byte16 and5 jand7 jand9 and11 and13 and15 and 17 Set 49 Direction Writing value direction
21. nd3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and 5 and 7 and 9 and11 and13 15 Page 16 UART TFT LCD user manual t Draw Box 18 Color XO YO X1 Y1 Box Width Draw a rectangle without fill can be simulated as a button for touchpad X0 YO will be the coordinate of the upper left corner of the rectangle X1 Y1 will be the coordinate of the lower right corner of the rectangle Box Width will be the width of the box in pixel Draw Circle Dec 19 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and 5 and 7 and 9 and 11 and13 15 Draw Circle 19 Color XO YO Circle Fill radius Circle Draw a Circle can be simulated as a button for touchpad X0 YO is the coordinate of the center of the circle Radius is radius of circle in pixel If the Fill Circle byte is 1 Circle will be filled with solid color otherwise circle will be a outline circle Draw Triangle Dec 20 Byte1 Byte2 and3 Byte4 Byte6 Bytes Byte10 Byte12 Byte14 and Byte16 and 17 and5 and 7 and 9 and11 and13 15 Draw Triangle 20 Color XO Yo X1 Y1 X2 Y2 Draw a outlined triangle according to the three coordinates sent Draw progress bar Dec 22 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and 5 and 7 and 9 and11 and13 15 Draw 22 Background Bar XO YO X1 Y1 Percentage Gradient Value progre
22. om image in PC Display dot data Dec 52 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 Byte16 and and5 and7 and9 and11 and13 and15 17 Display 52 Packet Size dot data dots data bytes Pixel Pixel Pixel Pixel Pixel Pixel Pixel 97 112 1 16 17 32 33 48 49 64 65 80 81 96 and so on This command is used to display dot data display single color bitmap character to the LCD After setting the LCD area and the writing direction command In each byte of dot data the 8 bits represent 8 pixel information A 0 will display the background color and a 1 will display font color as set in the LCD Set area command Page 24 UART TFT LCD user manual For example to draw a bitmap character G of 8x16pixel 1 Use the LCD set area command to set area X0 0 YO 0 X1 7 Y1 15 background color black and font color green 2 Use the set writing direction command to set horizontal writing direction 3 Use display dot data command to send 16bytes of dot data as showed in the picture 4 The LCD will display the character G Using this method bitmap characters or single color image can be drawn to the LCD Bits 00000000 00000000 00000000 00111100 01000010 10000001 10000000 10000000 10000111 10000001 10000001 01000011 00111101 00000000 00000000 00000000 in a much faster rate The drawing dire
23. ommands sent by host Touchpad Interrupt pin This pin is used to signal the host whether the touchpad is touched or not Active LOW If this pin is not connected and host want the touchpad information host can send request touchpad information periodically to poll touchpad information LCD reset pin Reset the LCD Active LOW Normally not used UART Bypass pin UART bypass output Used to connect other UART device to receive bypassed UART data 3 3V OV logic output Page 8 UART TFT LCD user manual t Connection diagram to arduino GND UART Bypass RESET Touchpad Interrupt CD Busy LCD Select GND LCD Transmit Tx Single wire mode Green only Full wire mode Green and Blue Power Red and Black Using the included arduino library to control the LCD is simple For example Clr_screen BLACK Clear the screen in black Draw_image 243 160 160 draw Image 243 at cord 160 160 Set_LCDbrightness 180 set brightness to medium level Draw_progressbar LIGHT_GREY GREEN 0 0 239 9 char percent_completed 15 Generate a progress bar based on percentage Draw_text BLACK YELLOW Hello World 0 10 239 138 7 Draw some text Draw_box CYAN 150 150 230 230 5 Draw a box simulating a button TP_pressed Check of screen is touched If TP_press x get_XCord y get_YCord Get touchpad coordinate information The arduino library UARTLCD is used to control the LCD in single wi
24. ouchpad data acquire and transmission to host require 10ms A polling frequency on 2 times per second would be sufficient for button pressed sensing purpose 6 How many images can I store on the flash 3Mbyte of space is provided for image storage It is enough to store 384 60x60pixel images or 96 120x120pixel images The size of image files in computer cannot be used for calculation as they are compressed file 7 Can the LCD display animation Page 27 UART TFT LCD user manual 10 11 12 Yes The LCD can load the animation image by image Frame rate can increase if the resolution is lowered The frame rate of 10fps can be achieved by repeatedly loading images of resolution 96x96px ie load one image every 100ms Can send command to the LCD module during LCD is busy in order to save transfer time It is not recommend although it is feasible as the module use interrupt to store UART data received However assertion of LCD select HIGH or sending the end byte should only be performed when LCD busy becomes HIGH as the LCD will process the command immediately when LCD select is HIGH or end bytes are detected Should checksum be enabled in the wired single wire mode It is not necessary Wired UART transmission has a very high accuracy What is the usage of the touchpad The touchpad is a very useful function of the module and it can be served as an buttons or input system to the host The host can scan the tou
25. ples gt UARTLCD gt Demo 1 Copy the UARTLCD folder in the arduino library package to your arduino s libraries folder Open arduino main application Select File gt Examples gt UARTLCD gt Demo Select your arduino board and COM port and upload the sketch Then connect the LCD to arduino with four wires 1 Arduino 5V and GND to LCD s 5V and GND 2 Arduino Tx Pin 1 to LCD s Rx 3 ARduino Tx Pin 2 to LCD s Tx Then supply your arduino with power either USB or DC jack the demo application will run and LCD will display the demo application Whenever the screen is touched its coordinate in 8bit will be displayed in the LCD A snap from the arduino demo application Page 32 UART TFT LCD user manual t B Fully customizable digital LCD clock with temperature and humidity function File gt Examples gt UARTLCD gt arduinoclock Hardware used UART TFT LCD module DS1302 Real time clock DHT11 Temp and humidity sensor Arudino based on UNO ee ee Sketch size 9826 bytes Connection DHT data to Pin2 DS1302 1 0 SLK CS to Pin 6 7 8 DS1302 RTC O 1 1 2013 amp 16 C 12 OLOY 50 Page 33 UART TFT LCD user manual Raspberry Pi Application example Fully customizable system information gadget showing a variety of Raspberry Pi information based on simple python script Hardware used Raspberry Pi mainboard 2 UART TFT LCD module 3 Wireless upgrade k
26. quired by the LCD touchpad General BT wireless module has an indoor range of 10m and outdoor range of 100m some are even longer This transmission is transparent to the LCD module so no specific settings are required However baud rate of 115200 or slower and checksum should be enabled in order to prevent LCD process corrupted data in case there is one The LCD PCB has a footprint specific for HC 07 06 Bluetooth module and these modules can be soldered directly to the LCD module If other type BT wireless modules are used they can be connected externally through pin headers The host and LCD BT module should be compatible with each other The wireless version package of the LCD module has a onboard wireless BT module and also a standalone BT module for connection to host UART TFT LCD can be placed remotely from the host Connection is made by wireless bluetooth module Page 12 UART TFT LCD user manual t LCD command and packet format In the full wire mode LCD will receive and parse UART data once LCD select is LOW It will store the data received in a 720byte buffer After the packet is transferred host will assert LCD select HIGH After this pin is asserted HIGH the LCD will assert LCD busy LOW within 10us and scan for a packet in the data buffer If a valid packet is received the LCD will process the command After the command or display is finished the LCD module will assert LCD busy HIGH indicating LCD is rea
27. r display dots data are used high baud rate can be set to achieve faster data transfer and display speed baud rate at 500000bps can be achieved using a CP2102 and PL2303HX USB to serial converter module 3 What is the delay required before another command is sent The recommend delay time is different for each command and baud speed As long as LCD busy become HIGH the LCD can accept the next command If single wire mode is used estimation of delay time is required For command without any display function to the LCD a delay of 10ms will be sufficient For command which display to LCD longer delay will be required A typical delay for drawing text image of size about a quarter of the LCD screen will be at least 100ms Delay time can be tested until the command functions Delay time should be set longer when using wireless UART modules 4 Can the display raw data and display dots data work in single wire mode Yes They are tested to function using single wire mode and single wire wireless transmission mode at 700 bytes of data each packet Nevertheless if bytes 160 and 157 exist consecutively in the pixel dots data it will cause premature packet termination However the chance occurrence is very low Host can implement the filtering of these consecutive bytes in the pixel data if necessary 5 How often do the polling of touchpad information is needed It depends on the response time of the touch action required A typical t
28. re mode Just place it in libraries folder and run the demo application There is also an example of creating a TFT LCD clock with UART TFT LCD DS1307 and DHT11 Please see arduino example or quick start guide for more information H Page 9 UART TFT LCD user manual Connection diagram to PC s USB gt UART adapter GND UART Bypass RESET Touchpad Interrupt LCD Busy LCD Select GND LCD Transmit Tx LCD Receive Rx 3 3V GND Vec 3 3V Transmit Tx Receive Rx GND Single wire mode Green only Full wire mode Green and Blue Power Red and Black Connection in single wire mode is demonstrated by the green wires Connection In full wire mode is demonstrated by blue wires RS 232 flow control signal DTR and DSR are used as GPIO pins to control LCD select and input of LCD Busy C libraries and demo application is included for application development The demo applications also demonstrate sending command and receiving touchpad information from the LCD module It also demonstrates advance functions of the LCD module drawing image and character bitmap to LCD directly The library is tested on common USB gt UART adapter including CP2102 FT232 and PL2303HX and will work on other virtual COM port USB gt UART device on common baud rates up to 500000bps Page 10 UART TFT LCD user manual Connection diagram to Raspberry Pi GND UART Bypass RESET Touchpad Interrupt
29. splayed to LCD Font no 1 to 10 for default fonts 11 15 for custom fonts Please refer to font section Clear screen Clear the LCD screen Display text Display text to the LCD screen Find color code This is used to find the 16bit color code 0 65535 if default color palette is not used Transferring images icons to the serial flash The serial flash of the LCD module is a 32Mbit 4Mbyte flash It consist of 1024 sectors of 4096 bytes The sector number is used to identify which image is displayed to the LCD during the UART command Sector number 0 to 256 is used for storing fonts therefore sector number 257 to 1023 is for user to store their image Page 5 UART TFT LCD user manual To download the image icon to the flash the image should be less than 320x240 pixels in dimension JPEG BMP ICO PNG are acceptable format i Press Load Image and select the image If the image is valid it can be previewed in the software Relevant information can be displayed For example this icon is a 36x36 pixel image It size to be written to the flash is 2600 bytes Enter the sector start address to be written This is the address used to identify this image to be displayed in the UART command As this image is 2600bytes this will take up one sector one sector is 4096 bytes For example a image with 160x120 pixel will be 38408 bytes which takes up 10 sectors the sector start address will be used to identify this
30. ss bar Color Color Draw a progress bar Bar color the color of the bar Background color the color of the background of the bar X0 YO upper left corner of the bar X1 Y1 lower right corner of the bar Percentage the percentage of the progress as indicated by the bar color Gradient value Create a gradient effect of the bar color Values can be ranged from 0 to 60000 Different values will create a different gradient effect Page 17 UART TFT LCD user manual t For example Back color 33808 Font Color 65535 X0 0 YO 0 X1 239 Y1 30 Percentage 50 Gradient value 33 Command packet 22 132 16 255 255 0 0 0 0 O 239 O 30 0 50 0 33 Draw Line Dec 23 Byte1 Byte2 and3 Byte4 Byte6 Bytes Byte10 Byte12 Byte14 Byte16 and 17 and 5 and 7 and 9 and 11 and13 and 15 Draw Line 23 Color XO YO X1 Y1 Line Width Draw a line starting from X0 YO to X1 Y1 Line width is the width of the line in pixel Draw image Dec 32 Byte1 Byte2 and3 Byte4 Byte6 Byte8 Byte10 Byte12 Byte14 and Byte16 and 17 and5 and 7 and 9 and 11 and13 15 Draw Image 32 Image Start X0 YO from flash sector Draw an image on the LCD according to image start sector If the sector is invalid or does not contain an image or is not the start address of the image the
31. t 1 2 8 UART TFT LCD module 2 70cm USB2 0 cable 3 1x8pin 2 54mm dupont cable Page 4 UART TFT LCD user manual Getting started Connect the LCD to a USB port windows will automatically detected new hardware UART TFT LCD Select the location of the driver folder and continue with window s instruction Control software requires Microsoft NET framework 3 5 or above NET framework is already included in Windows Vista and 7 For Windows XP if you don t have NET framework installed it can be downloaded here htto www microsoft com download en details aspx id 17718 Device settings Communcation buad rate This sets the baud rate for UART communication The default is 38400bps Please make sure your host device supports the specific baud rate LCD Startup brightness This sets the LCD brightness when the LCD is powered on after all the LCD module initialize process the brightness can be set through UART command LCD Startup orientation This sets the orientation for the LCD module Details see orientation section Enable LED Flash the onboard LED during data transfer and display in progress Enable single wire mode Check to enable single wire mode uncheck to enable full wire mode Details please see transmission mode Enable single wire CKSUM Enable LCD module to check UART command s checksum before processing the command Details please see transmission mode Test LCD Text Area Text to be di
32. to the information sent Background color the background colour of the text Font color the color of the text Font number the Font number of the text There are 10 fonts in the default flash numbered 1 to 10 with increasing font size Page 19 UART TFT LCD user manual The first character of the text will start from byte 16 It should be a single byte ASCII or ASCII extended character The text string should end with a byte 0 The total characters of the text should not be greater than 680 Line break Byte 10 can be inserted in the text string for a link break The text will be drawn within the rectangular frame from X0 YO to X1 Y1 For example Back color 65524 Font Color 63488 X0 0 YO 0 X1 319 Y1 50 Fontno 6 Text 123456 Command packet 33 255 244 248 0 0 0 0 1 63 0 50 0 6 49 50 51 52 53 54 0 Cmd Back color FontColor XO YO X1 Y1 Fontno ae 3 4 5 6 end Back color 65524 Font Color 65304 X0 0 YO 0 X1 319 Y1 50 Fontno 6 Text 123456 newline 7890ab Command packet 33 255 244 248 16 0 0 0 0 1 63 0 50 0 6 49 50 51 52 53 54 10 55 56 57 48 97 98 O Cmd Back color FontColor XO YO X1 Y1 Fontno 1 2 3 4 5 6 jLinebk 7 8 9 0 a b jend Page 20 UART TFT LCD user manual t Advan
Download Pdf Manuals
Related Search