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Update hub_demo.ino

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Updated code per @Lauszus request. The first item updated was a comment on LINE #308 saying that the string is UTF-16LE encoded. This is why we have to skip every second character when printing the string. The second item was figuring out the proper buffer size for LINE #280. After some research I found that the maximum string length is limited to 255 bytes since the bLength field is 1 byte long. I changed the buffer size to 256 to accommodate for this. Finally, I cleaned up some of the code to make it more consistent. This is purely aesthetic, and subjective at that.
This commit is contained in:
stumpja 2016-02-29 08:50:20 -05:00 committed by Kristian Sloth Lauszus
parent 3413f5b21e
commit 4be94d11c5
1 changed files with 11 additions and 12 deletions
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23
examples/hub_demo/hub_demo.ino
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@ -68,18 +68,15 @@ void PrintDescriptors(uint8_t addr)
uint8_t num_conf = 0; uint8_t num_conf = 0;
rcode = getdevdescr( (uint8_t)addr, num_conf ); rcode = getdevdescr( (uint8_t)addr, num_conf );
if ( rcode ) if ( rcode ) {
{
printProgStr(Gen_Error_str); printProgStr(Gen_Error_str);
print_hex( rcode, 8 ); print_hex( rcode, 8 );
} }
Serial.print("\r\n"); Serial.print("\r\n");
for (int i = 0; i < num_conf; i++) for (int i = 0; i < num_conf; i++) {
{
rcode = getconfdescr( addr, i ); // get configuration descriptor rcode = getconfdescr( addr, i ); // get configuration descriptor
if ( rcode ) if ( rcode ) {
{
printProgStr(Gen_Error_str); printProgStr(Gen_Error_str);
print_hex(rcode, 8); print_hex(rcode, 8);
} }
@ -100,10 +97,8 @@ void loop()
{ {
Usb.Task(); Usb.Task();
if ( Usb.getUsbTaskState() == USB_STATE_RUNNING ) if ( Usb.getUsbTaskState() == USB_STATE_RUNNING ) {
{ if ((millis() - next_time) >= 0L) {
if ((millis() - next_time) >= 0L)
{
Usb.ForEachUsbDevice(&PrintAllDescriptors); Usb.ForEachUsbDevice(&PrintAllDescriptors);
Usb.ForEachUsbDevice(&PrintAllAddresses); Usb.ForEachUsbDevice(&PrintAllAddresses);
@ -282,7 +277,7 @@ uint8_t getallstrdescr(uint8_t addr)
// function to get single string description // function to get single string description
unsigned int getstrdescr( unsigned int addr, uint8_t idx ) unsigned int getstrdescr( unsigned int addr, uint8_t idx )
{ {
uint8_t buf[ 66 ]; uint8_t buf[ 256 ];
unsigned int rcode; unsigned int rcode;
uint8_t length; uint8_t length;
uint8_t i; uint8_t i;
@ -310,7 +305,7 @@ unsigned int getstrdescr( unsigned int addr, uint8_t idx )
Serial.print("Error retrieving string "); Serial.print("Error retrieving string ");
return ( rcode ); return ( rcode );
} }
for ( i = 2; i < length; i += 2 ) { for ( i = 2; i < length; i += 2 ) { //string is UTF-16LE encoded
Serial.print((char) buf[i]); Serial.print((char) buf[i]);
} }
return ( rcode ); return ( rcode );
@ -338,6 +333,7 @@ void print_hex(int v, int num_places)
} }
while (--num_nibbles); while (--num_nibbles);
} }
/* function to print configuration descriptor */ /* function to print configuration descriptor */
void printconfdescr( uint8_t* descr_ptr ) void printconfdescr( uint8_t* descr_ptr )
{ {
@ -357,6 +353,7 @@ void printconfdescr( uint8_t* descr_ptr )
print_hex( conf_ptr->bMaxPower, 8 ); print_hex( conf_ptr->bMaxPower, 8 );
return; return;
} }
/* function to print interface descriptor */ /* function to print interface descriptor */
void printintfdescr( uint8_t* descr_ptr ) void printintfdescr( uint8_t* descr_ptr )
{ {
@ -378,6 +375,7 @@ void printintfdescr( uint8_t* descr_ptr )
print_hex( intf_ptr->iInterface, 8 ); print_hex( intf_ptr->iInterface, 8 );
return; return;
} }
/* function to print endpoint descriptor */ /* function to print endpoint descriptor */
void printepdescr( uint8_t* descr_ptr ) void printepdescr( uint8_t* descr_ptr )
{ {
@ -394,6 +392,7 @@ void printepdescr( uint8_t* descr_ptr )
return; return;
} }
/*function to print unknown descriptor */ /*function to print unknown descriptor */
void printunkdescr( uint8_t* descr_ptr ) void printunkdescr( uint8_t* descr_ptr )
{ {