Question: #include #include #include #define lcdport PORTA #define signal PORTB #define en PB2 #define rw PB1 #define rs PB0 char password[1]; char lock[0]; char key; char

#include #include #include #define lcdport PORTA #define signal PORTB #define en PB2 #define rw PB1 #define rs PB0 char password[1]; char lock[0]; char key; char keycheck(); char scankey(); void lcdcmd(unsigned char cmd); void lcdint(); unsigned char lcd_read(); void lcddata(unsigned char data); void send_a_command(unsigned char command); void send_a_character(unsigned char character); void send_a_string(char *string_of_characters); int main() { DDRA=0xff; DDRB=0x0f; DDRD=0xf0; char key; lcdint(); lcddata('E'); lcddata('N'); lcddata('T'); lcddata('E'); lcddata('R'); lcddata(' '); lcddata('P'); lcddata('A'); lcddata('S'); lcddata('S'); lcddata('W'); lcddata('O'); lcddata('R'); lcddata('D'); lcdcmd(0xC0); for(int i=0;i<3;i++) { key=scankey(); _delay_ms(1000); lcddata(key); password[i]=key; } lcdcmd(0x01); if((password[0]=='7')&&(password[1]=='9')&&password[2]=='4') {lcddata('C'); lcddata('O'); lcddata('R'); lcddata('R'); lcddata('E'); lcddata('C'); lcddata('T'); lcddata(' '); lcddata('P'); lcddata('A'); lcddata('S'); lcddata('S'); lcddata('W'); lcddata('O'); lcddata('R'); lcddata('D'); DDRC=0xff; PORTC=0x02; _delay_ms(3000); PORTC=0x00; lcdcmd(0x01); lcdcmd(0x80); lcddata('L'); lcddata('O'); lcddata('C'); lcddata('K'); lcddata('?'); lcddata(' '); lcddata('P'); lcddata('R'); lcddata('E'); lcddata('S'); lcddata('S'); lcddata(' '); lcddata('1'); lcdcmd(0xC0); key=scankey(); _delay_ms(1000); lcddata(key); lock[0]=key; if(lock[0]=='1') {DDRC=0xff; PORTC=0x01; _delay_ms(3000); PORTC=0x00; lcdcmd(0x01); lcddata('L'); lcddata('O'); lcddata('C'); lcddata('K'); lcddata('E'); lcddata('D'); _delay_ms(1000); return main(); } } else lcddata('W'); lcddata('R'); lcddata('O'); lcddata('N'); lcddata('G'); lcddata(' '); lcddata('P'); lcddata('A'); lcddata('S'); lcddata('S'); lcddata('W'); lcddata('O'); lcddata('R'); lcddata('D'); return main(); } char scankey() { char key='a'; while(key=='a') { key=keycheck(); } return key; } char keycheck() { PORTD=0b11101111; _delay_ms(10); if((PIND&0b00000001)==0) { return '7'; } if((PIND&0b00000010)==0) { return '8'; } if((PIND&0b00000100)==0) { return '9'; } if((PIND&0b00001000)==0) { return 'A'; } PORTD=0b11011111; _delay_ms(10); if((PIND&0b00000001)==0) { return '4'; } if((PIND&0b00000010)==0) { return '5'; } if((PIND&0b00000100)==0) { return '6'; } if((PIND&0b00001000)==0) { return 'B'; } PORTD=0b10111111; _delay_ms(10); if((PIND&0b00000001)==0) { return '1'; } if((PIND&0b00000010)==0) { return '2'; } if((PIND&0b00000100)==0) { return '3'; } if((PIND&0b00001000)==0) { return'C'; } PORTD=0b01111111; _delay_ms(10); if((PIND&0b00000001)==0) { return '*'; } if((PIND&0b00000010)==0) { return '0'; } if((PIND&0b00000100)==0) { return '#'; } if((PIND&0b00001000)==0) { return'D'; } return 'a'; } void lcdint() { lcdcmd(0x38); _delay_ms(1); lcdcmd(0x01); _delay_ms(1); lcdcmd(0x0F); _delay_ms(100); lcdcmd(0x82); _delay_ms(100); lcdcmd(0x89); _delay_ms(10); lcdcmd(0x01); } void lcdcmd(unsigned char x) { lcdport=x; signal=(0<

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