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Problem on changing the display name of usb hid example code

 
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harshanahnd



Joined: 22 Nov 2008
Posts: 11

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Problem on changing the display name of usb hid example code
PostPosted: Sat Dec 13, 2008 11:11 am     Reply with quote
Hi,

I used ex_usb_hid.c example code to develop a usb hid device. I wanted to change the display string of it. ( The one which get shown when connected to the PC). After I change it the device wont get identified by the software that I have written but the PC does. Does anyone know how to change the following string correctly in the file usb_desc_hid.h,



Code:


char USB_STRING_DESC_OFFSET[]={0,4,12};

char const USB_STRING_DESC[]={
   //string 0
         4, //length of string index
         USB_DESC_STRING_TYPE, //descriptor type 0x03 (STRING)
         0x09,0x04,   //Microsoft Defined for US-English
   //string 1
         8, //length of string index
         USB_DESC_STRING_TYPE, //descriptor type 0x03 (STRING)
         'C',0,
         'S',0,
         'S',0,
   //string 2
         26, //length of string index
         USB_DESC_STRING_TYPE, //descriptor type 0x03 (STRING)
         'C',0,
         'C',0,
         'S',0,
         ' ',0,
         'H',0,
         'I',0,
         'D',0,
         ' ',0,
         'D',0,
         'E',0,
         'M',0,
         'O',0



I want to change the "CCS HID DEMO" string to another different length string .

Thanks...
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Dec 13, 2008 1:49 pm     Reply with quote
Post your modified version of the code that you posted.
Guest
PostPosted: Sat Dec 13, 2008 9:32 pm     Reply with quote
Code:

char USB_STRING_DESC_OFFSET[]={0,4,12};

char const USB_STRING_DESC[]={
   //string 0
         4, //length of string index
         USB_DESC_STRING_TYPE, //descriptor type 0x03 (STRING)
         0x09,0x04,   //Microsoft Defined for US-English
   //string 1
         8, //length of string index
         USB_DESC_STRING_TYPE, //descriptor type 0x03 (STRING)
         'W',0,
         'S',0,
         'N',0,
   //string 2
         46, //length of string index
         USB_DESC_STRING_TYPE, //descriptor type 0x03 (STRING)
         'W',0,
         'S',0,
         'N',0,
         ' ',0,
         'C',0,
         'o',0,
         'o',0,
         'r',0,
         'd',0,
         'i',0,
         'n',0,
         'a',0,
         't',0,
         'o',0,
         'r',0,
         ' ',0,
         'b',0,
         'y',0,
         ' ',0,
         'C',0,
         'S',0,
         'E',0




And in the usb.h file , I have changed #DEFINE USB_DESC_INTERFACE_LEN 9 to 21.



Code:

//The length of each descriptor
#DEFINE USB_DESC_DEVICE_LEN      18 //#DEFINE USB_DEVICE_DESC_LEN      18
#DEFINE USB_DESC_CONFIG_LEN      9  //#DEFINE USB_CONFIG_DESC_LEN      9
#DEFINE USB_DESC_INTERFACE_LEN   21  //#DEFINE USB_INTERFACE_DESC_LEN   9
#DEFINE USB_DESC_CLASS_LEN       9  //#DEFINE USB_CLASS_DESC_LEN       9
#DEFINE USB_DESC_ENDPOINT_LEN    7  //#DEFINE USB_ENDPOINT_DESC_LEN    7



Thats all I did .

Thanks... Confused
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Sun Dec 14, 2008 3:20 am     Reply with quote
Quote:
And in the usb.h file , I have changed #DEFINE USB_DESC_INTERFACE_LEN 9 to 21.

That's wrong. You didn't change the interface descriptor length (it's fixed by specification) rather than a descriptor string length. The string length is coded correctly in the string list, as far as I see.
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