51单片机宏定义的例子

代码

demo.c

#include "hardware.h"void delay()
{volatile unsigned int n;for(n = 0; n < 50000; n++);
}int main(void)
{IO_init();while(1){PINSET(LED);delay();PINCLR(LED);delay();}return 0;
}

cfg.h

#ifndef _CFG_H_
#define _CFG_H_//ϵͳʱÖÓƵÂÊ
#define F_CPU        8000000UL//LEDÏÔʾ
#define LED          P0, 0#endif

hardware.h

#ifndef _HARDWARE_H_
#define _HARDWARE_H_ 1#include <reg51.h>#include "cfg.h"
#include "macromcu.h"DEFPIN(LED);extern void IO_init();#endif

micromcu.h

#ifndef _MACRO_MCU_H_
#define _MACRO_MCU_H_ 1#include <reg51.h>#define PIN_OUTPUT     1
#define PIN_INPUT      1#define PIN_HIGH       1
#define PIN_LOW        0#define MACRO_CONCAT2_EXPAND(a, b)  a ## b
#define MACRO_CONCAT2(a, b)         MACRO_CONCAT2_EXPAND(a, b)
#define MACRO_CONCAT3_EXPAND(a, b, c) a ## b ## c
#define MACRO_CONCAT3(a, b, c)      MACRO_CONCAT3_EXPAND(a, b, c)#define MACRO_ARG21(a, b)           a
#define MACRO_ARG22(a, b)           b#define PIN_PRRFIX                  PIN_
#define DEFPIN(pin)      sbit MACRO_CONCAT3(PIN_PRRFIX, MACRO_ARG21(pin), MACRO_ARG22(pin)) = MACRO_ARG21(pin) ^ MACRO_ARG22(pin)#define PINDIR(pin, DIR)  MACRO_CONCAT3(PIN_PRRFIX, MACRO_ARG21(pin), MACRO_ARG22(pin)) = 1
#define PINOUT(pin, OUT)  MACRO_CONCAT3(PIN_PRRFIX, MACRO_ARG21(pin), MACRO_ARG22(pin)) = OUT
#define PININ(pin)        MACRO_CONCAT3(PIN_PRRFIX, MACRO_ARG21(pin), MACRO_ARG22(pin))#define PINSET(pin)  MACRO_CONCAT3(PIN_PRRFIX, MACRO_ARG21(pin), MACRO_ARG22(pin)) = 1
#define PINCLR(pin)  MACRO_CONCAT3(PIN_PRRFIX, MACRO_ARG21(pin), MACRO_ARG22(pin)) = 0
#define PININV(pin)  MACRO_CONCAT3(PIN_PRRFIX, MACRO_ARG21(pin), MACRO_ARG22(pin)) = !MACRO_CONCAT3(PIN_PRRFIX, MACRO_ARG21(pin), MACRO_ARG22(pin))#endif

hardware.c

#include "cfg.h"
#include "macromcu.h"
#include "hardware.h"void IO_init()
{PINDIR(LED, PIN_OUTPUT);PINCLR(LED);}

仿真效果图：