なんでも作っちゃう、かも。

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include "ftd2xx.h"

// Globals
FT_HANDLE ftHandle = NULL;

void quit()
{  
  if(ftHandle != NULL) {
    FT_Close(ftHandle);
    ftHandle = NULL;
    printf("Closed device ¥n");
  }
  
  exit(1);
}

int main(int argc, char *argv[])
{
  DWORD  dwBytesInQueue;
  FT_STATUS  ftStatus;
  
    signal(SIGINT, quit);    // trap ctrl-c call quit fn 
  
  ftStatus = FT_Open(0, &ftHandle);
  if(ftStatus != FT_OK) {
    /* 
    This can fail if the ftdi_sio driver is loaded
     use lsmod to check this and rmmod ftdi_sio to remove
     also rmmod usbserial
     */
    printf("FT_Open failed = %d ¥n", ftStatus);
    if(ftStatus == FT_DEVICE_NOT_FOUND)
      printf("ftdi device not found ¥n");
    else if(ftStatus == FT_DEVICE_NOT_OPENED)
      printf("ftdi device not opend ¥n"
           "unload ftdi_sio ¥n"
           "linux) rmmod ftdi_sio ¥n"
           "osx) sudo kextunload /System/Library/Extensions/FTDIUSBSerialDriver.kext ¥n");
    return 1;
  }
  
  ftStatus = FT_SetBitMode(ftHandle, 0xff, 0x04); // D0-D7 output
  if(ftStatus != FT_OK) {
    printf("Failed to set bit mode ¥n");  
  }
  
  ftStatus = FT_SetBaudRate(ftHandle, 9600);
  if(ftStatus != FT_OK) {
    fprintf(stderr,"FT_SetBaudRate failed = %d ¥n");
    return 1;
  }
  
  ftStatus = FT_Purge(ftHandle,FT_PURGE_RX|FT_PURGE_TX);
  if(ftStatus != FT_OK) {
    fprintf(stderr,"FT_Purge failed = %d ¥n");
    return 1;
  }
  
  int x;
  do {
    printf(">");
    scanf("%x",&x);
    
    char c = x & 0xff;
    FT_Write(ftHandle, &c, 1, &dwBytesInQueue);
    
  }while(x != 0xaa);
  
  if(ftHandle != NULL) {
    FT_Close(ftHandle);
    ftHandle = NULL;
  }
  
  return 0;
}