#include <sys/types.h>
#include <stdio.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <fcntl.h> #include <memory.h> void * map_base; FILE *f; int n,fd; int main(int argc,char *argv[]) { if((fd=open("/dev/mem",O_RDWR|O_SYNC))==-1) { return(-1); } map_base=mmap(0,0xff,PROT_READ|PROT_WRITE,MAP_SHARED,fd,GPIO_BASE); PEDR = (volatile unsigned int *) (map_base+rPEDR); PEDDR = (volatile unsigned int *) (map_base+rPEDDR); PEDR = 0x03; //E0 E1配成输出 while(1) { PEDR = (1<<0);//E0置高 sleep(1); PEDR &= !(1<<0);//E0口置低 sleep(1); } close(fd); munmap(map_base,0xff);//解除映射关系 } |
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