The process known as the “Complete Guide to Crystalfontz ⁄634 Boot Screens” refers to the methods, commands, and official software utilities used to change, customize, and save the permanent startup splash screen on Crystalfontz CFA632 (16×2 character) and CFA634 (20×4 character) intelligent LCD modules. Official Utilities & Software Tools
To configure your boot screen easily without manual hexadecimal programming, Crystalfontz provides specialized software:
632/634 Boot Screen Editor: A legacy Beta utility designed specifically to demonstrate features, set custom characters, arrange logos, and flash a custom boot screen for hardware versions v2.4 and below.
cfTest / WinTest: The standard diagnostic utilities used to type live text directly onto the LCD, adjust contrast, and execute the exact EEPROM save commands.
CrystalControl2: Configuration software primarily used to manage real-time PC data screens (like CPU usage) once the module finishes booting. Core Technical Workflow
The architecture of these smart modules stores the boot screen directly into the onboard non-volatile EEPROM memory. To create a custom boot screen manually through a terminal or a testing utility like WinTest, developers utilize a 3-step process:
Design the Layout: Send standard characters or custom mapped graphics to the screen until the display looks exactly how you want it to appear at startup.
Save to EEPROM: Send the command 9 to permanently copy the current screen state into the flash memory.
Set Boot Behavior: Send the command 9 to instruct the LCD firmware to hold this splash screen on power-up until the host computer begins transmitting active data. Key Limitations & Requirements
Baud Rate Matters: The software utility or terminal must match the module’s default connection speed—typically 19200 baud for serial configurations.
Port Conflicts: You cannot update the boot screen if another program (like a hardware monitor or background service) is currently occupying the device’s COM port.
Custom Graphics Limitations: Because these are character-based LCDs (not matrix displays), custom logos must be generated using an array of up to 8 unique 5×8 pixel custom characters. If you are currently setting up a display, let me know: www.crystalfontz.com 632_634_BOOT_SCREEN from Crystalfontz
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