?? button-test.c
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#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#define NOKEY 0int main(){ int key7_fd; char ret[2]; key7_fd = open("/dev/key7", O_RDONLY); if(key7_fd<0) { printf("open key7 device error!\n"); return 0; } else{ printf("key7 is opened!"); } while(1) { read(key7_fd,ret,1); if (ret[0] != NOKEY) { printf("key = %c\n",ret[0]); } usleep(100000); } close(key7_fd); return 0;}
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