Arduino USB host - First programs.

/* MAX3421E USB Host controller SPI test */
/* This sketch tests SPI communication between Arduino and MAX3421E USB host controller */
#include <Spi.h>
#include <Max3421e.h>
 
void setup();
void loop();
 
byte i;
byte j = 0;
byte gpinpol_copy;
 
MAX3421E Max;
 
void setup()
{
    Serial.begin( 9600 );
    Max.powerOn();
    delay(200);
}
 
void loop()
{
  gpinpol_copy = Max.regRd( rGPINPOL );
  Serial.println("SPI test. Each  '.' indicates 64K transferred. Press any key to stop.");
  while( Serial.available() == 0 ) {
    for( i = 0; i < 255; i++ ) {
      Max.regWr( rGPINPOL, i );
      if( Max.regRd( rGPINPOL ) != i ) {
        Serial.println("SPI transmit/receive mismatch");
      }
    }//for( i = 0; i < 255; i++
      j++;
      if( j == 0 ) {
        Serial.print(".");
      }
  }//while( Serial.available() == 0 
  Max.regWr( rGPINPOL, gpinpol_copy );
  Serial.println("\r\nStopped.");
  while( 1 );    //stop here
}

/* This sketch dumps MAX3421E registers */
#include <Spi.h>
#include <Max3421e.h>
 
MAX3421E Max;  //MAX3421E instance
 
/* Regiser names/numbers for MAX3421E register dump */
typedef struct {
  const char* name;
  char number;
}
REGISTER_OUTPUT;
 
REGISTER_OUTPUT max_register[] = {
  { "\r\nRCVFIFO:\t",   rRCVFIFO    },
  { "\r\nSNDFIFO:\t",   rSNDFIFO    },
  { "\r\nSUDFIFO:\t",   rSUDFIFO    },
  { "\r\nRCVBC:\t",     rRCVBC      },
  { "\r\nSNDBC:\t",     rSNDBC      },
  { "\r\nUSBIRQ:\t",    rUSBIRQ     },
  { "\r\nUSBIEN:\t",    rUSBIEN     },
  { "\r\nUSBCTL:\t",    rUSBCTL     },
  { "\r\nCPUCTL:\t",    rCPUCTL     },
  { "\r\nPINCTL:\t",    rPINCTL     },
  { "\r\nREVISION:\t",  rREVISION   },
  { "\r\nIOPINS1:\t",   rIOPINS1    },
  { "\r\nIOPINS2:\t",   rIOPINS2    },
  { "\r\nGPINIRQ:\t",   rGPINIRQ    },
  { "\r\nGPINIEN:\t",   rGPINIEN    },
  { "\r\nGPINPOL:\t",   rGPINPOL    },
  { "\r\nHIRQ:\t",      rHIRQ       },
  { "\r\nHIEN:\t",      rHIEN       },
  { "\r\nMODE:\t",      rMODE       },
  { "\r\nPERADDR:\t",   rPERADDR    },
  { "\r\nHCTL:\t",      rHCTL       },
  { "\r\nHXFR:\t",      rHXFR       },
  { "\r\nHRSL:\t",      rHRSL       }
};
 
 
void setup()
{
  Serial.begin( 9600 );
  Max.powerOn();
}
 
void loop()
{
  unsigned char i;
  unsigned char numregs = sizeof( max_register )/sizeof( REGISTER_OUTPUT);
  for( i = 0; i < numregs; i++ ) {
    Serial.print( max_register[ i ].name);
    print_hex( Max.regRd( max_register[ i ].number ), 8 );
  }
  while(1); 
 
}
 
/* prints hex numbers with leading zeroes */
// copyright, Peter H Anderson, Baltimore, MD, Nov, '07
// source: http://www.phanderson.com/arduino/arduino_display.html
void print_hex(int v, int num_places)
{
  int mask=0, n, num_nibbles, digit;
 
  for (n=1; n<=num_places; n++)
  {
    mask = (mask << 1) | 0x0001;
  }
  v = v & mask; // truncate v to specified number of places
 
  num_nibbles = num_places / 4;
  if ((num_places % 4) != 0)
  {
    ++num_nibbles;
  }
 
  do
  {
    digit = ((v >> (num_nibbles-1) * 4)) & 0x0f;
    Serial.print(digit, HEX);
  } 
  while(--num_nibbles);
 
}

 
/* MAX3421E interrupt loop */
#include <Spi.h>
#include <Max3421e.h>
 
MAX3421E Max;
 
byte rcode;
byte vbus_state;
 
void setup()
{
  Serial.begin( 9600 );
  Serial.println("Start");
  Max.powerOn();
}
 
void loop()
{
  Max.Task();
  print_vbus_state();
}
 
void print_vbus_state( void )
{
  char* vbus_states[] = { "Disconnected", "Illegal", "Full speed", "Low speed" };
  byte tmpbyte;  
  static byte last_state = 4;
    tmpbyte = Max.getVbusState(); 
    if( tmpbyte != last_state ) {
      last_state = tmpbyte;
      Serial.println( vbus_states[ tmpbyte ] );
    }
    return;
}