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11.8 Set and Save Contrast
Syntax
Hexadecimal 0xFE 0x91 [contrast]
Decimal 254 145 [contrast]
Parameters
Parameter Length Description
contrast 1 Contrast value (0 to 255).
Description This command sets the display’s contrast to [contrast], where [contrast]
is a value between 0x00 and 0xFF (between 0 to 255). Lower values
cause ‘on’ elements in the display area to appear lighter, while higher
values cause ‘on’ elements to appear darker. Lighting conditions will
affect the actual value used for optimal viewing. Individual display
modules will also differ slightly from each other in appearance. In
addition, values for optimal viewing while the display backlight is on
may differ from values used when backlight is off.
NOTE This command saves the [contrast] value so that it is not lost after power down.
Remembered Yes
Default 128
12 Filesystem
12.1 Introduction
The GLK19264-7T-1U incorporates a 16 Kbyte on board flash memory in order to allow up to 128 font
and bitmap files to be transfered directly onto the display and recalled whenever necessary. The filesystem
can address font and bitmap files combined up to 16 Kbytes. It is recommended that fonts and bitmaps
are uploaded when possible all together after a filesystem wipe ro preserve memory integrity. These fonts
and bitmaps can then be locked to ensure they remain intact. This section covers uploading, downloading,
deleting and moving files, as well as getting the remaining space or wiping the filesystem.
12.1.1 File Upload Protocol
In order to allow fonts and bitmaps to be uploaded to the on board flash memory Matrix Orbital has
developed a simple protocol that supports RS-232/TTL or I
2
C communications. In order to begin a file
transmission the first step will be to provide the display module with the appropriate command bytes, mean-
ing the command prefix, 0xFE, followed by the command number, 0x24 for a font file, or 0x5E for a bitmap
file. This will begin the file transfer sequence. The next step will be to request a reference identification
number (ref ID) which will allow you to identify the file for future use. Reference ID numbers can be any
byte between 0x00 and 0x7F, however each ID must be unique.
The next part of uploading a font file is to provide the display module with the two byte file size of the
Matrix Orbital GLK19264-7T-1U 44
- GLK19264-7T-1U 1
- Technical Manual 1
- Revision: 1.2 1
- Contents 2
- 1 Getting Started 6
- Figure 3: Standard Power 7
- Figure 4: 5V Power Adapter 7
- 1.3 Features 9
- 1.4 Connecting to a PC 9
- 1.5 Installing the Software 10
- 2 Hardware Information 11
- 2.4 Protocol Select Jumpers 15
- 2.5 Manual Override 16
- 3 Troubleshooting 17
- 4 Communications 19
- C Transaction Example 20
- 4.1.3 Serial Communication 20
- 4.1.4 USB Communication 20
- 4.2 Turn Flow Control On 21
- 4.3 Turn Flow Control Off 21
- 4.4 Changing the I 22
- C Slave Address 22
- 4.5 Changing the Baud Rate 22
- CrystalSpeed 23
- 8×DesiredBaud 23
- 5.1.2 Creating a Font 25
- 5.2 Uploading a Font File 26
- 5.3 Setting the Current Font 27
- 5.4 Font Metrics 28
- 5.5 Set Box Space Mode 28
- 6.1 Introduction 29
- 6.2 Move Cursor Home 29
- 6.5 Auto Scroll On 30
- 6.6 Auto Scroll Off 30
- 7 Bitmaps 31
- 7.4 Drawing a Bitmap Directly 32
- 8 Bar Graphs and Drawing 33
- 8.3 Draw Pixel 34
- 8.4 Drawing a Line 34
- 8.5 Continue a Line 34
- 8.6 Draw a Rectangle 35
- 8.7 Drawing a Solid Rectangle 35
- 8.8 Initializing a Bar Graph 36
- 8.9 Drawing a Bar Graph 36
- 8.11 Shifting a Strip Chart 38
- 9 General Purpose Output 39
- 10 Keypad 41
- 10.4 Poll Key Press 43
- 10.5 Clear Key Buffer 43
- 10.6 Set Debounce Time 43
- 10.7 Set Auto Repeat Mode 44
- 10.8 Auto Repeat Mode Off 45
- 10.9 Assign Keypad Codes 45
- 11 Display Functions 46
- 11.3 Display On 47
- 11.4 Display Off 47
- 11.5 Set Brightness 47
- 11.6 Set and Save Brightness 48
- 11.7 Set Contrast 48
- 12 Filesystem 49
- 12.2 Wipe Filesystem 51
- 12.3 Deleting a File 53
- 12.4 Get Filesystem Space 53
- 12.5 Get Filesystem Directory 54
- 12.6 Filesystem Upload 54
- 12.7 Downloading a File 54
- 13 Data Security 55
- 13.2 Set Remember 56
- 13.3 Data Lock 56
- 13.4 Set and Save Data Lock 58
- 13.5 Dump the Filesystem 58
- 13.6 Write Customer Data 58
- 13.7 Read Customer Data 58
- 14 Miscellaneous 59
- 15 Command Summary 61
- 15.4 Bitmaps 62
- 15.5 Bar Graphs and Drawing 62
- 15.6 General Purpose Output 63
- 15.7 Keypad 63
- 15.8 Display Functions 64
- 15.9 Filesystem 64
- 15.10 Data Security 65
- 15.11 Miscellaneous 65
- 15.12 Command By Number 66
- 16 Appendix 67
- 16.2 Optical Characteristics 68
- 16.3 Physical Layout 68
- Figure 24: Physical Diagram 69
- 16.4 Ordering Information 71
- 16.5 Definitions 71
- 16.7 Revision History 71
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