제가 생각하는 동작은 1. RFID 태그를 접촉하면 이용가능 횟수가 줄어듬, 스위치 동작 가능 → 스위치를 이용해 모터 제어 인데  모터 동작이 안돼요ㅜㅜ 도움 부탁드립니다.
 
#include <mega128a.h> 
#include <alcd.h>
#include <delay.h>
#define DCMotor_in1 PORTB.0
#define DCMotor_in2 PORTB.1
 unsigned char buff;
 buff=PINA;
    char data0;
    bit flag=0;
    int take=100;
    unsigned char data[16];
    unsigned char count =0;

void DC_cw()
{
    DCMotor_in1=1;
    DCMotor_in2=0;
}
void DC_ccw()
{
    DCMotor_in1=0;
    DCMotor_in2=1;
}
void DC_stop()
{
    DCMotor_in1=0;
    DCMotor_in2=0;
}
void main(void)
{
    
    UCSR0A = 0x00;
    UCSR0B = 0x98;
    UCSR0C = 0x06;
    UBRR0H = 0x00;
    UBRR0L = 103;
    #asm("sei") 
    PORTA=0xff;
    DDRA=0x00;
    PORTB=0x00;
    DDRB=0xff;
    PORTC=0xff;
    DDRC=0xff;
    lcd_init(16);
    usart0_init();
    lcd_gotoxy(0,0);
    lcd_puts("Welcome");
    
while (1)
    {
   
   
    
    switch (buff)
           {
           case 0xfe:
                    DC_cw();
           break;
           case 0xfd:
                    DC_ccw();
           break;
           
           case 0xfb:
                    DC_stop();
           break;
           }
     
    if(flag)
    {
    flag=0;
    data[count++] = '\0';
    count=0;
    lcd_print(data, --take);
    
    }
}
}
 
    void lcd_print(char* data, int take)
    {
    lcd_clear();
    lcd_gotoxy(0,0);
    lcd_printf("Received: %d",take);
    lcd_gotoxy(0,1);
    lcd_puts(data);
    }
    
    
    
    interrupt [USART0_RXC] void usart0_rx_isr(void)
    {
        
        data0=UDR0;
        data[count++] = data0;
        if(count>7){
        flag=1;
        }
    }