CCS C Software and Maintenance Offers
FAQFAQ   FAQForum Help   FAQOfficial CCS Support   SearchSearch  RegisterRegister 

ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to CCS Technical Support
Problem on changing the display name of usb hid example code

 
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion
View previous topic :: View next topic  
Author Message
harshanahnd



Joined: 22 Nov 2008
Posts: 11

View user's profile Send private message

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

View user's profile Send private message

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

View user's profile Send private message

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.
Display posts from previous:   
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group