Help in understanding C-langugage command

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somf0872

Joined: 14 Oct 2003
Posts: 95
Helped: 1

19 Feb 2006 14:43 c langugage

Can anybody help me out that what does this C-language commands mean :

PORTC &= ~((1<<LCD_RW)|(1<<LCD_E));
PORTC |= ((1<<LCD_RS)|(1<<LCD_E));

I mean ................... I need some explanation on this.

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artem

Joined: 22 May 2003
Posts: 1652
Helped: 91
Location: Turan

19 Feb 2006 18:23 Help in understanding C-langugage command

LCD_RW, LCD_E, LCD_RS are bit positions (from 0 to 7) on port C, usually defined by #define preprocessor statement as constants . So if you find constant definitions you will be able to recognise what pin of port C is connected to LCD controll pins .

Statements above do :
first - reset to zero pins pointed by LCD_RW and LCD_E, the rest pins stay unchanged

second - set to one pins pointed by LCD_RS and LCD_E , rest of pins stay unchanged .