button_test.c

来自「按键驱动实验 基于TEB-44B0实验平台的按键驱动 包括按键驱动程序与测试」· C语言 代码 · 共 38 行

/* button_test.c - little program to test the response of the button’s driver*/
// modified by Vencent for TEB-44B0 board

#include <stdio.h>
#include <string.h>
#include <errno.h>
//#include <asm/MC68VZ328.h>
//#include "s3c44b0x.h"
#include <asm/fcntl.h>
#define DEVICE_FILE_NAME  "/dev/button"
/* main */
main() {
  int  file_desc=0;
  int  isTSopen=0;
  int  bytes_transfered=0;
  int  i;
  char buffer;
  
  file_desc = open(DEVICE_FILE_NAME,O_RDWR);
    if(file_desc < 0) {
      printf("Can't open device file: %s\n",DEVICE_FILE_NAME);
      printf("Error: %s\n",strerror(errno));
    }
    else {
      printf("Device %s open -> It works!!!!\n",DEVICE_FILE_NAME);
      isTSopen=1;
    }

    while(1){
    if(isTSopen) { 
        bytes_transfered=read(file_desc,&buffer,sizeof(buffer));
        printf("nb bytes transfered: %d\n",bytes_transfered);
        printf("the message is %c !\n",buffer);
       }
    }  
}