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How to change the usb descriptor?

 
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young



Joined: 24 Jun 2004
Posts: 285

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How to change the usb descriptor?
PostPosted: Thu Jan 27, 2005 3:28 pm     Reply with quote
I am using the ex_usb_hid.c example from the ccs. the sample so far working fine.
I want to change the Transfer and Receive data bytes. I saw in the sample file, if I want to do that I have to change the usb description,
Quote:

#define USB_EP1_TX_ENABLE 1 //turn on EP1 for IN bulk/interrupt transfers
#define USB_EP1_TX_SIZE 2 //if you change this, be sure to change the hid descriptor

//the following defines needed for the CCS USB PIC driver to enable the RX endpoint 1
#define USB_EP1_RX_ENABLE 1 //turn on EP1 for OUT bulk/interrupt transfers
#define USB_EP1_RX_SIZE 2 //if you change this, be sure to change the hid descriptor


I want to the file provide by ccs, and find out the usb_desc.c file, but I do not know how to change it.

for example, if I want to
#define USB_EP1_TX_SIZE 20 ( this number is secret to me, what is the maximum number for me to define here
and
#define USB_EP1_RX_SIZE 2
How accordingly, I should change the usb desceiption?

Thank you!
young



Joined: 24 Jun 2004
Posts: 285

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PostPosted: Thu Jan 27, 2005 5:38 pm     Reply with quote
I looked into the usb_desc.h file and changed here
Code:

  BYTE CONST USB_HID_DESC[] = {  //len=28
      6, 0, 255,    // Usage Page = Vendor Defined
      9, 1,            // Usage = IO device
      0xa1, 1,       // Collection = Application
      0x19, 1,        // Usage minimum
      0x29, 8,        // Usage maximum

      0x15, 0x80,        // Logical minimum (-128)
      0x25, 0x7F,        // Logical maximum (127)

      0x75, 8,        // Report size = 8 (bits)
      0x95, 2,        // Report count = 16 bits (2 bytes)
      0x81, 2,        // Input (Data, Var, Abs)
      0x19, 1,        // Usage minimum
      0x29, 8,        // Usage maximum
//***********************************************************
      0x91, 8,        // Output (Data, Var, Abs)  //changed to 8 original is 2
//***********************************************************
      0xc0            // End Collection
   };


after I compiled the program, windows could not recognize, and said this is a new device.

please help
Guest
PostPosted: Thu Jan 27, 2005 9:53 pm     Reply with quote
young wrote:
I looked into the usb_desc.h file and changed here
Code:

  BYTE CONST USB_HID_DESC[] = {  //len=28
      6, 0, 255,    // Usage Page = Vendor Defined
      9, 1,            // Usage = IO device
      0xa1, 1,       // Collection = Application
      0x19, 1,        // Usage minimum
      0x29, 8,        // Usage maximum

      0x15, 0x80,        // Logical minimum (-128)
      0x25, 0x7F,        // Logical maximum (127)

      0x75, 8,        // Report size = 8 (bits)
      0x95, 2,        // Report count = 16 bits (2 bytes)
      0x81, 2,        // Input (Data, Var, Abs)
      0x19, 1,        // Usage minimum
      0x29, 8,        // Usage maximum
//***********************************************************
      0x91, 8,        // Output (Data, Var, Abs)  //changed to 8 original is 2
//***********************************************************
      0xc0            // End Collection
   };


after I compiled the program, windows could not recognize, and said this is a new device.

please help

This is not correct.
It sounds like you need to read the USB spec. It's availble for free, do a google search.
Guest
PostPosted: Fri Jan 28, 2005 7:31 am     Reply with quote
any idea where and how I should change the USB descriptor or may be I do not even need to change, but how I can set more data instead of just 2 bytes a time.
young



Joined: 24 Jun 2004
Posts: 285

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PostPosted: Fri Jan 28, 2005 9:52 am     Reply with quote
I found it, it should be
0x95, 2, // Report count = 16 bits (2 bytes)
young



Joined: 24 Jun 2004
Posts: 285

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PostPosted: Fri Jan 28, 2005 10:23 am     Reply with quote
I did with the usb_put_packet(ep1,data,8);

how can i sent data message more than 8 for example 20,or 30 bytes,

I tried usb_puts(ep1,data,30,8,10);

I just received the first 8 bytes, I did not receieve the following bytes, why
did I use usb_puts wrong?
Guest
PostPosted: Fri Jan 28, 2005 11:59 am     Reply with quote
any suggestions?
Guest
PostPosted: Fri Jan 28, 2005 1:47 pm     Reply with quote
I found a solution by sending data packet by packet. anyway, I did not find out usb_puts working if any one success to do that, please let me know.
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