Help in understanding C-langugage command

[somf0872]

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.

--X--

 

[artem]

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 .