Delay for LCD - Electronic Circuits Projects Diagrams Free

MrNobody · 23rd May 2008, 02:12 PM

Hi..
I need some help with few delays for LCD.
I am using PIC18F4620 running at 40MHz and am trying to use C18 xlcd library to control LCD.

Inside there I need to create 3 delay functions namely
void DelayFor18TCY(void);
void DelayPORXLCD(void);
void DelayXLCD(void);

For void DelayPORXLCD(void), i can use Delay10KTCYx(15) to generate a delay of 15ms.
And as for DelayXLCD(void); i can use Delay10KTCYx(5) to generate a delay of 5ms.

However, what is the duration of delay for DelayFor18TCY(void).

Please advise.. Thanks..

futz · 23rd May 2008, 02:33 PM

If you're doing 44780 LCDs you should have these must-read articles from EPE Magazine:
http://www.epemag.wimborne.co.uk/lcd1.pdf
http://www.epemag.wimborne.co.uk/lcd2.pdf

The information you need is in there.

MrNobody · 23rd May 2008, 02:35 PM

I read the C18 Compiler libraries and it wrote the DelayFor18TCY( void ) as

void DelayFor18TCY( void )
{
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
}

Any reason why it is 12 Nop()s..?
Thanks..

MrNobody · 23rd May 2008, 02:36 PM

Thanks for the post futz.. Will read it..

Mike, K8LH · 23rd May 2008, 03:52 PM

Quote:

Originally Posted by MrNobody

I read the C18 Compiler libraries and it wrote the DelayFor18TCY( void ) as

void DelayFor18TCY( void )
{
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
}

Any reason why it is 12 Nop()s..?
Thanks..

Perhaps they're including cycles used for the call or rcall and return instructions?

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23rd May 2008, 02:12 PM	(permalink)
MrNobody	Delay for LCD Hi.. I need some help with few delays for LCD. I am using PIC18F4620 running at 40MHz and am trying to use C18 xlcd library to control LCD. Inside there I need to create 3 delay functions namely void DelayFor18TCY(void); void DelayPORXLCD(void); void DelayXLCD(void); For void DelayPORXLCD(void), i can use Delay10KTCYx(15) to generate a delay of 15ms. And as for DelayXLCD(void); i can use Delay10KTCYx(5) to generate a delay of 5ms. However, what is the duration of delay for DelayFor18TCY(void). Please advise.. Thanks.. Last edited by MrNobody; 23rd May 2008 at 02:19 PM.

23rd May 2008, 02:33 PM	(permalink)
futz	If you're doing 44780 LCDs you should have these must-read articles from EPE Magazine: http://www.epemag.wimborne.co.uk/lcd1.pdf http://www.epemag.wimborne.co.uk/lcd2.pdf The information you need is in there. __________________ ========================= Futz's Microcontrollers & Robotics =========================

23rd May 2008, 02:35 PM	(permalink)
MrNobody	I read the C18 Compiler libraries and it wrote the DelayFor18TCY( void ) as void DelayFor18TCY( void ) { Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); } Any reason why it is 12 Nop()s..? Thanks..

23rd May 2008, 02:36 PM	(permalink)
MrNobody	Thanks for the post futz.. Will read it..