LCD4E2 - Revision history

Admin: Created page with "The built in LCD driver for the PIN mode is written to support a worst case scenario where you use random pins of the microprocessor to drive the LCD pins.
2013-02-13T10:07:38Z

Created page with "The built in LCD driver for the PIN mode is written to support a worst case scenario where you use random pins of the microprocessor to drive the LCD pins. <span style="font-..."

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The built in LCD driver for the PIN mode is written to support a worst case scenario where you use random pins of the microprocessor to drive the LCD pins.

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This makes it easy to design your PCB but it needs more code.

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When you want to have less code you need fixed pins for the LCD display.

With the statement $LIB "LCD4E2.LBX" you specify that the LCD4.LIB will be used.

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The following connections are used in the asm code:

Rs = PortB.0

RW = PortB.1 we don’t use the R/W option of the LCD in this version so connect to ground

E = PortB.2

E2 = PortB.3 the second E pin of the LCD

Db4 = PortB.4 the data bits must be in a nibble to save code

Db5 = PortB.5

Db6 = PortB.6

Db7 = PortB.7

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You can change the lines from the lcd4e2.lib file to use another port.

Just change the address used :

.EQU LCDDDR=$17 ; change to another address for DDRD ($11)

.EQU LCDPORT=$18 ; change to another address for PORTD ($12)

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See the demo lcdcustom4bit2e.bas in the SAMPLES dir.

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Note that you still must select the display that you use with the [[CONFIG LCD|CONFIG LCD]] statement.

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See also the [[LCD4.LIB|lcd4.lib]] for driving a display with 1 E line.

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A display with 2 E lines actually is a display with 2 control chips. They must both be controlled. This library allows you to select the active E line from your code.

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In your basic code you must first select the E line before you use a LCD statement.

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The initialization of the display will handle both chips.

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Note that LBX is a compiled LIB file. In order to change the routines you need the commercial edition with the source code(lib files). After a change you should compile the library with the library manager.

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[[Category:LCD]]