GPIOA高8位输入控制低8位输出(位绑定 #define)

#include "public.h"

#define GPIOA_ODR_ADDR (GPIOA_BASE+0x0c)
#define GPIOA_IDR_ADDR (GPIOA_BASE+0x08)

//#define BitBand(Addr,BitNum) ((Addr&F0000000)+0x2000000 + ((Addr&0xfffff)*32) + (BitNum*4))
#define BitBand(Addr,BitNum) *((unsigned long *)((Addr&0xf0000000)+0x2000000 + ((Addr&0xfffff)<<5) + (BitNum<<2)))

#define PAOut(n)    BitBand(GPIOA_ODR_ADDR,n)
#define PAIn(n)     BitBand(GPIOA_IDR_ADDR,n)

int main()
{
    int i;
    GPIOA->CRH = 0x44444444;
    GPIOA->CRL = 0x33333333;
    while(1)
    {
        for(i=0; i<8; i++)
        {
            if(PAIn(i+8) == 1)
                PAOut(i) = 1;
            else 
                PAOut(i) = 0;
        }
    }
}