From BitWizard WIKI
Revision as of 17:41, 30 January 2012 by Rew (talk | contribs) (Programming)

Jump to: navigation, search
The SPI_LCD board
The SPI_LCD board

This is the documentation page for the SPI_LCD board.


Assembly instructions

Possible Configurations

External resources


Additional software

Related projects



Jumper settings


To display a string on the LCD, just send over SPI the same bytes you would send to LCD, prefixed with the address of the LCD.

Bytes above 0xf0 are "special".

0xf0 <xy> is set cursor. the <xy> byte is 3 bit line number and 5 bit position number. This addressing allows up to 8 lines of 32 characters.

0xf1 is clear LCD.

0xf2 <addr> is "set address". If you want to change the address the module reacts to. The address is stored in eeprom, and will remain this way after a powercycle.

0xf3 <contrast> is "set contrast". This will set the contrast to the value you specify. 0x40 is the default that works fine for the LCDs that we have.

0xf4 <backlight> is the "set backlight intensity" command. This will set the backlight intensity to the value specified.

0xff <byte> will send the byte to the LCD without special character processing. Tthis allows you to send codes 0xf0 through 0xff to the LCD if required.

Other bytes are reserved and are currently implemented as a no-op.

The software

Default operation

Future hardware enhancements

Future software enhancements



  • Initial public release