define.h

采用Atmega16的变频式超声波发生器的源代码

#define fosc 16000000
#define baudrate 9600
#define baud (fosc/16/baudrate-1)
#define screen_max 20

#define sbi(x,y) x|=(1<<y)
#define cbi(x,y) x&=~(1<<y)
#define gbi(x,y) x&(1<<y)

typedef unsigned char uchar ;
typedef unsigned int uint ;
typedef unsigned long ulong ;

#define porta PORTA
#define portb PORTB
#define portc PORTC
#define portd PORTD
#define porte PORTE
#define portf PORTF
#define portg PORTG

#define ddra DDRA
#define ddrb DDRB
#define ddrc DDRC
#define ddrd DDRD
#define ddre DDRE
#define ddrf DDRF
#define ddrg DDRG

#define pina PINA
#define pinb PINB
#define pinc PINC
#define pind PIND
#define pine PINE
#define pinf PINF
#define ping PING