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/* MAX3421E USB Host controller get configuration descriptor */
#include <Spi.h>
#include <Max3421e.h>
#include <Usb.h>
#define LOBYTE(x) ((char*)(&(x)))[0]
#define HIBYTE(x) ((char*)(&(x)))[1]
#define BUFSIZE 256 //buffer size
void setup();
void loop();
MAX3421E Max;
USB Usb;
void setup()
{
byte tmpdata = 0;
Serial.begin( 9600 );
Serial.println("Start");
Max.powerOn();
delay( 200 );
}
void loop()
{
byte rcode;
byte tmpbyte;
Max.Task();
Usb.Task();
if( Usb.getUsbTaskState() >= USB_STATE_CONFIGURING ) { //state configuring or higher
/* entering configuration number to decode. Restricted to first 10 configurations */
Serial.print("Enter configuration number: ");
while( Serial.available() == 0 ); //wait for input
tmpbyte = Serial.read();
Serial.println( tmpbyte );
tmpbyte -= 0x30; //convert to number
if( tmpbyte > 9 ) {
Serial.println("Not a number. Assuming configuration 0");
tmpbyte = 0;
}
rcode = getconfdescr( 1, tmpbyte ); //get configuration descriptor
if( rcode ) {
Serial.println( rcode, HEX );
}
// while( 1 ); //stop
}
}
byte getconfdescr( byte addr, byte conf )
{
char buf[ BUFSIZE ];
char* buf_ptr = buf;
byte rcode;
byte descr_length;
byte descr_type;
unsigned int total_length;
rcode = Usb.getConfDescr( addr, 0, 4, conf, buf ); //get total length
LOBYTE( total_length ) = buf[ 2 ];
HIBYTE( total_length ) = buf[ 3 ];
if( total_length > BUFSIZE ) { //check if total length is larger than buffer
Serial.println("Total length truncated to 256 bytes");
total_length = BUFSIZE;
}
rcode = Usb.getConfDescr( addr, 0, total_length, conf, buf ); //get the whole descriptor
while( buf_ptr < buf + total_length ) { //parsing descriptors
descr_length = *( buf_ptr );
descr_type = *( buf_ptr + 1 );
switch( descr_type ) {
case( USB_DESCRIPTOR_CONFIGURATION ):
printconfdescr( buf_ptr );
break;
case( USB_DESCRIPTOR_INTERFACE ):
printintfdescr( buf_ptr );
break;
case( USB_DESCRIPTOR_ENDPOINT ):
printepdescr( buf_ptr );
break;
default:
printunkdescr( buf_ptr );
break;
}//switch( descr_type
Serial.println("");
buf_ptr = ( buf_ptr + descr_length ); //advance buffer pointer
}//while( buf_ptr <=...
return( 0 );
}
/* 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);
}
/* function to print configuration descriptor */
void printconfdescr( char* descr_ptr )
{
USB_CONFIGURATION_DESCRIPTOR* conf_ptr = ( USB_CONFIGURATION_DESCRIPTOR* )descr_ptr;
Serial.println("Configuration descriptor:");
Serial.print("Total length:\t");
print_hex( conf_ptr->wTotalLength, 16 );
Serial.print("\r\nNum.intf:\t\t");
print_hex( conf_ptr->bNumInterfaces, 8 );
Serial.print("\r\nConf.value:\t");
print_hex( conf_ptr->bConfigurationValue, 8 );
Serial.print("\r\nConf.string:\t");
print_hex( conf_ptr->iConfiguration, 8 );
Serial.print("\r\nAttr.:\t\t");
print_hex( conf_ptr->bmAttributes, 8 );
Serial.print("\r\nMax.pwr:\t\t");
print_hex( conf_ptr->bMaxPower, 8 );
return;
}
/* function to print interface descriptor */
void printintfdescr( char* descr_ptr )
{
USB_INTERFACE_DESCRIPTOR* intf_ptr = ( USB_INTERFACE_DESCRIPTOR* )descr_ptr;
Serial.println("\r\nInterface descriptor:");
Serial.print("Intf.number:\t");
print_hex( intf_ptr->bInterfaceNumber, 8 );
Serial.print("\r\nAlt.:\t\t");
print_hex( intf_ptr->bAlternateSetting, 8 );
Serial.print("\r\nEndpoints:\t\t");
print_hex( intf_ptr->bNumEndpoints, 8 );
Serial.print("\r\nClass:\t\t");
print_hex( intf_ptr->bInterfaceClass, 8 );
Serial.print("\r\nSubclass:\t\t");
print_hex( intf_ptr->bInterfaceSubClass, 8 );
Serial.print("\r\nProtocol:\t\t");
print_hex( intf_ptr->bInterfaceProtocol, 8 );
Serial.print("\r\nIntf.string:\t");
print_hex( intf_ptr->iInterface, 8 );
return;
}
/* function to print endpoint descriptor */
void printepdescr( char* descr_ptr )
{
USB_ENDPOINT_DESCRIPTOR* ep_ptr = ( USB_ENDPOINT_DESCRIPTOR* )descr_ptr;
Serial.println("\r\nEndpoint descriptor:");
Serial.print("Endpoint address:\t");
print_hex( ep_ptr->bEndpointAddress, 8 );
Serial.print("\r\nAttr.:\t\t");
print_hex( ep_ptr->bmAttributes, 8 );
Serial.print("\r\nMax.pkt size:\t");
print_hex( ep_ptr->wMaxPacketSize, 16 );
Serial.print("\r\nPolling interval:\t");
print_hex( ep_ptr->bInterval, 8 );
return;
}
/*function to print unknown descriptor */
void printunkdescr( char* descr_ptr )
{
byte length = *descr_ptr;
byte i;
Serial.println("\r\nUnknown descriptor:");
Serial. print("Length:\t\t");
print_hex( *descr_ptr, 8 );
Serial.print("\r\nType:\t\t");
print_hex( *(descr_ptr + 1 ), 8 );
Serial.print("\r\nContents:\t");
descr_ptr += 2;
for( i = 0; i < length; i++ ) {
print_hex( *descr_ptr, 8 );
descr_ptr++;
}
}
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