AVR 经典数码管驱动

void delay_nus(unsigned int n); void delay_1ms(void); void delay_nms(unsigned int n); //端口初始化 void port_init(void) { PORTA = 0x14; DDRA = 0xFF; PORTB = 0x00; DDRB = 0xFF; PORTC = 0x00; DDRC = 0x00; PORTD = 0x1C; DDRD = 0x10; } //外中断初始化 void int_init(void) { MCUCR |= 0x00; MCUCSR|= 0x