USB_Host_Shield_2.0/examples/ftdi/USBFTDILoopback/USBFTDILoopback.pde

#include <avrpins.h>
#include <max3421e.h>
#include <usbhost.h>
#include <usb_ch9.h>
#include <Usb.h>
#include <usbhub.h>
#include <avr/pgmspace.h>
#include <address.h>

#include <cdcftdi.h>

#include <printhex.h>
#include <message.h>
#include <hexdump.h>
#include <parsetools.h>

#include "pgmstrings.h"  

class FTDIAsync : public FTDIAsyncOper
{
public:
    virtual uint8_t OnInit(FTDI *pftdi);
};

uint8_t FTDIAsync::OnInit(FTDI *pftdi)
{
    uint8_t rcode = 0;
    
    rcode = pftdi->SetBaudRate(115200);

    if (rcode)
    {
        ErrorMessage<uint8_t>(PSTR("SetBaudRate"), rcode);
        return rcode;
    }
    rcode = pftdi->SetFlowControl(FTDI_SIO_DISABLE_FLOW_CTRL);
    
    if (rcode)
        ErrorMessage<uint8_t>(PSTR("SetFlowControl"), rcode);
            
    return rcode;
}

USB              Usb;
//USBHub         Hub(&Usb);
FTDIAsync        FtdiAsync;
FTDI             Ftdi(&Usb, &FtdiAsync);

uint32_t next_time;

void setup()
{
  Serial.begin( 115200 );
  Serial.println("Start");

  if (Usb.Init() == -1)
      Serial.println("OSC did not start.");
      
  delay( 200 );
  
  next_time = millis() + 5000;
}

void loop()
{
    Usb.Task();
  
    if( Usb.getUsbTaskState() == USB_STATE_RUNNING )
    {  
        uint8_t  rcode;
        char strbuf[] = "DEADBEEF";
        Serial.print(".");
        
        rcode = Ftdi.SndData(8, (uint8_t*)strbuf);

	if (rcode)
            ErrorMessage<uint8_t>(PSTR("SndData"), rcode);

        delay(50);
        
        uint8_t  buf[16];
        
        for (uint8_t i=0; i<16; i++)
            buf[i] = 0;
            
        uint16_t rcvd = 15;
        rcode = Ftdi.RcvData(&rcvd, buf);
        
        if (rcode && rcode != hrNAK)
            ErrorMessage<uint8_t>(PSTR("Ret"), rcode);
            
        // The device reserves the first two bytes of data
        //   to contain the current values of the modem and line status registers.
        if (rcvd > 2)        
            Serial.print((char*)(buf+2)); 
        
        delay(10);            
    }    
}