you code works with this modification:Try this code and see what it prints.
Code:char i = 0; for(i = 1; i < 21; i++) { LCD_Chr(1,i,'A'); LCD_Chr(2,i,'A'); LCD_Chr(3,i,'A'); LCD_Chr(4,i,'A'); }
Code:
int c='A';
char i = 0;
for(i = 1; i < 21; i++) {
LCD_Chr(1,i,c);
LCD_Chr(2,i,c);
LCD_Chr(3,i,c);
LCD_Chr(4,i,c);
}