INITLCD - Revision history

Admin: Created page with "= Action = Initializes the LCD display. =
2013-02-11T19:18:26Z

Created page with "= <span class="f_Header">Action</span> = Initializes the LCD display. <span style="font-family: Arial;"> </span> <span style="font-family: Arial;"> </span> = <sp..."

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Initializes the LCD display.

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= <span class="f_Header">Syntax</span> =

<span class="f_Syntax">INITLCD</span>

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= <span class="f_Header">Remarks</span> =

The LCD display is initialized automatic at start up when LCD statements are used by your code.

This is done by a call to _LCD_INIT.

If you include the INITLCD statement in your code, the automatic call is disabled and the _LCD_INIT is called at the place in your code where you put the INITLCD statement. (initlcd is translated into a call to _init_lcd).

 

Why is this useful?
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| In an environments with static electricity, the display can give strange output.
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You can initialize the display then once in a while. When the display is initialized, the display content is cleared also.
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| The LCD routines depend on the fact that the WR pin of the LCD is connected to ground. But when you connect it to a port pin, you must first set the logic level to 0 and after that you can initialize the display by using INITLCD
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| Xmega chips need a stable oscillator. This is done with some CONFIG statements. The INITLCD should be placed after these commands. And since the Xmega by default has a slow internal oscillator, without using INITLCD at the proper location, your application would start slow. See the explanation below.
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| So in short you have more control when the LCD is initialized.
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[[File:Notice.jpg|left|Notice.jpg]]The [[CONFIG LCDPIN|CONFIG LCDPIN]] has an option to use the WR pin, and use the busy flag of the display. If you have enough pins, this is the best mode.

 

[[File:Notice.jpg|left|Notice.jpg]]The <span style="font-weight: bold;">XMEGA</span> has a built in internal oscillator that runs at a relative slow speed. If your code sets the speed to 32 MHz and you also include the $crystal=32000000 directive, you will notice a delay in the start of the code. This is caused by the fact that the delay routines are calculated with the 32 Mhz frequency, but the actual oscillator speed is 1 or 2 MHz.

There are 2 solutions possible.

- you can use $crystal=1000000 and then after you have set up the clock speed with CONFIG OSC, you can use another $CRYSTAL directive with the new speed.

- you use $INITMICRO and put the CONFIG OSC in the _INIT_MICRO code. This will ensure that the micro will run at the specified speed early as possible.

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= <span class="f_Header">ASM</span> =

The generated ASM code :

Rcall _Init_LCD

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= <span class="f_Header">See also</span> =

[[LCD]] , [[CONFIG LCDPIN|CONFIG LCDPIN]]

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= <span class="f_Header">Example</span> =

NONE

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