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c progrmming explaination--

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//main routine
//declare i/o pins

void main(){
TRISA = 0b00000001; // PORTA is input
TRISB = 0b11111111; //
TRISC = 0b10000000;
TRISD = 0b11000000;
TRISE = 0b00000000;
LCD_Config(&PORTD,4,5,6,0,1,2,3);
LCD_Cmd(LCD_CLEAR); // send command to LCD (clear LCD)
Lcd_Out(1,1, "Vending Machine");
Lcd_Out(2,1, " System ");
Delay_ms(2000);
LCD_Cmd(LCD_CLEAR);
degree=0;
if (!but10) //if button10 pressed? then setup
setup();


can 1 any1 explain ths section of programing..
hw thy set portA as input, and other portS.
 

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