usb_specific_request.c

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 * this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
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//_____ I N C L U D E S ____________________________________________________

#include "config.h"
#include "conf_usb.h"
#include "lib_mcu/usb/usb_drv.h"
#include "usb_descriptors.h"
#include "modules/usb/device_chap9/usb_standard_request.h"
#include "usb_specific_request.h"
#if ((USB_DEVICE_SN_USE==ENABLE) && (USE_DEVICE_SN_UNIQUE==ENABLE))
#include "lib_mcu/flash/flash_drv.h"
#endif

//_____ D E F I N I T I O N ________________________________________________

#ifdef __GNUC__
extern PGM_VOID_P pbuffer;
#else
extern U8   code *pbuffer;
#endif
extern U8   data_to_transfer;
extern code S_usb_hid_report_descriptor_kbd usb_hid_report_descriptor_kbd;

U8 g_u8_report_rate=0;

//_____ D E C L A R A T I O N ______________________________________________

void hid_get_report_descriptor(void);
void usb_hid_set_report_ouput(void);
void usb_hid_set_idle (U8 u8_report_id, U8 u8_duration );
void usb_hid_get_idle (U8 u8_report_id);
void hid_get_hid_descriptor(void);


Bool usb_user_read_request(U8 type, U8 request)
{
   U8    wValue_msb;
   U8    wValue_lsb;

   // Read wValue
   wValue_lsb = Usb_read_byte();
   wValue_msb = Usb_read_byte();

   //** Specific request from Class HID
   if( USB_SETUP_GET_STAND_INTERFACE == type )
   {
      switch( request )
      {
         case SETUP_GET_DESCRIPTOR:
         switch( wValue_msb ) // Descriptor ID
         {
            case DESCRIPTOR_HID:
            hid_get_hid_descriptor();
            return TRUE;
            break;
   
            case DESCRIPTOR_REPORT:
            hid_get_report_descriptor();
            return TRUE;
   
            case DESCRIPTOR_PHYSICAL:
            // TODO
            break;
         }
         break;
      }
   }
   if( USB_SETUP_SET_CLASS_INTER == type )
   {
      switch( request )
      {
         case SETUP_HID_SET_REPORT:
         // The MSB wValue field specifies the Report Type
         // The LSB wValue field specifies the Report ID
         switch (wValue_msb)
         {
            case REPORT_TYPE_INPUT:
            // TODO
            break;
            
            case REPORT_TYPE_OUTPUT:
            usb_hid_set_report_ouput();
            return TRUE;
            break;

            case REPORT_TYPE_FEATURE:
            break;
         }
         break;

         case SETUP_HID_SET_IDLE:
         usb_hid_set_idle(wValue_lsb,wValue_msb);
         return TRUE;
   
         case SETUP_HID_SET_PROTOCOL:
         // TODO if you use a sub class HID_SUB_CLASS_BOOT
         break;
      }
   }
   if( USB_SETUP_GET_CLASS_INTER == type )
   {
      switch( request )
      {
         case SETUP_HID_GET_REPORT:
         // TODO
         break;
         case SETUP_HID_GET_IDLE:
         usb_hid_get_idle(wValue_lsb);
         return TRUE;
         case SETUP_HID_GET_PROTOCOL:
         // TODO if you use a sub class HID_SUB_CLASS_BOOT
         break;
      }
   }
   return FALSE;  // No supported request
}


void usb_user_endpoint_init(U8 conf_nb)
{
   usb_configure_endpoint( EP_KBD_IN,     \
                           TYPE_INTERRUPT,\
                           DIRECTION_IN,  \
                           SIZE_8,        \
                           ONE_BANK,      \
                           NYET_ENABLED);
}


U8   usb_user_interface_get( U16 wInterface )
{
   return 0;  // Only one alternate setting possible for all interface
}


void usb_user_interface_reset(U16 wInterface, U8 alternate_setting)
{  
   // default setting selected = reset data toggle
   if( INTERFACE_NB_KBD == wInterface )
   {
      // Interface mouse
      Usb_select_endpoint(EP_KBD_IN);
      Usb_disable_stall_handshake();
      Usb_reset_endpoint(EP_KBD_IN);
      Usb_reset_data_toggle();
   }
}

   
Bool usb_user_get_descriptor(U8 type, U8 string)
{
   switch(type)
   {
      case DESCRIPTOR_STRING:
      switch (string)
      {
         case LANG_ID:
         data_to_transfer = sizeof (usb_user_language_id);
         pbuffer = &(usb_user_language_id.bLength);
         return TRUE;
         break;
        
         case MAN_INDEX:
         data_to_transfer = sizeof (usb_user_manufacturer_string_descriptor);
         pbuffer = &(usb_user_manufacturer_string_descriptor.bLength);
         return TRUE;
         break;
        
         case PROD_INDEX:
         data_to_transfer = sizeof (usb_user_product_string_descriptor);
         pbuffer = &(usb_user_product_string_descriptor.bLength);
         return TRUE;
         break;
           
#if (USB_DEVICE_SN_USE==ENABLE)              
         case SN_INDEX:
         data_to_transfer = sizeof (usb_user_serial_number);
         pbuffer = &(usb_user_serial_number.bLength);
#if (USE_DEVICE_SN_UNIQUE==ENABLE)
         f_get_serial_string=TRUE;
         data_to_transfer += (SN_LENGTH*4);
#endif
         return TRUE;
         break;
#endif
      }
      break;
   }
   return FALSE;
}


void hid_get_report_descriptor(void)
{
   U16 wLength;
   U8  nb_byte;
   bit zlp = FALSE;
   U16 wInterface;

   LSB(wInterface)=Usb_read_byte();
   MSB(wInterface)=Usb_read_byte();

   data_to_transfer = sizeof(usb_hid_report_descriptor_kbd);
   pbuffer = &(usb_hid_report_descriptor_kbd.report[0]);

   LSB(wLength) = Usb_read_byte();
   MSB(wLength) = Usb_read_byte();
   Usb_ack_receive_setup();

   if (wLength > data_to_transfer)
   {
      if ((data_to_transfer % EP_CONTROL_LENGTH) == 0) { zlp = TRUE; }
      else { zlp = FALSE; }
   }
   else
   {
      data_to_transfer = (U8)wLength;           // send only requested number of data
   }

   while((data_to_transfer != 0) && (!Is_usb_receive_out()))
   {
      while(!Is_usb_read_control_enabled());

      nb_byte=0;
      while(data_to_transfer != 0)              // Send data until necessary
      {
         if(nb_byte++==EP_CONTROL_LENGTH)       // Check endpoint 0 size
         {
            break;
         }
#ifndef __GNUC__
         Usb_write_byte(*pbuffer++);
#else    // AVRGCC does not support point to PGM space
//warning with AVRGCC assumes devices descriptors are stored in the lower 64Kbytes of on-chip flash memory
         Usb_write_byte(pgm_read_byte_near((unsigned int)pbuffer++));
#endif
         data_to_transfer --;
      }
      Usb_send_control_in();
   }

   if(Is_usb_receive_out())
   { 
      // abort from Host
      Usb_ack_receive_out();
      return;
   }
   if(zlp == TRUE)
   { 
      while(!Is_usb_read_control_enabled());
      Usb_send_control_in();
   }

   while(!Is_usb_receive_out());
   Usb_ack_receive_out();
}


void usb_hid_set_report_ouput (void)
{
   Usb_ack_receive_setup();
   Usb_send_control_in();

   while(!Is_usb_receive_out());
   Usb_ack_receive_out();
   Usb_send_control_in();
}


void usb_hid_set_idle (U8 u8_report_id, U8 u8_duration )
{
   U16 wInterface;
   
   // Get interface number to put in idle mode
   LSB(wInterface)=Usb_read_byte();
   MSB(wInterface)=Usb_read_byte();
   Usb_ack_receive_setup();
  
   g_u8_report_rate = u8_duration;
   
   Usb_send_control_in();
   while(!Is_usb_in_ready());
}


void usb_hid_get_idle (U8 u8_report_id)
{
   U16 wLength;
   U16 wInterface;

   // Get interface number to put in idle mode
   LSB(wInterface)= Usb_read_byte();
   MSB(wInterface)= Usb_read_byte();
   LSB(wLength)   = Usb_read_byte();
   MSB(wLength)   = Usb_read_byte();
   Usb_ack_receive_setup();
   
   if( wLength != 0 )
   {
      Usb_write_byte(g_u8_report_rate);
      Usb_send_control_in();
   }
   
   while(!Is_usb_receive_out());
   Usb_ack_receive_out();
}


void hid_get_hid_descriptor(void)
{
   U16 wLength;
   U8  nb_byte;
   bit zlp=FALSE;
   U16 wInterface;

   LSB(wInterface)=Usb_read_byte();
   MSB(wInterface)=Usb_read_byte();

   data_to_transfer = sizeof(usb_conf_desc.hid_kbd);
   pbuffer = &(usb_conf_desc.hid_kbd.bLength);

   LSB(wLength) = Usb_read_byte();
   MSB(wLength) = Usb_read_byte();
   Usb_ack_receive_setup();

   if (wLength > data_to_transfer)
   {
      if ((data_to_transfer % EP_CONTROL_LENGTH) == 0) { zlp = TRUE; }
      else { zlp = FALSE; }                     // no need of zero length packet
   }
   else
   {
      data_to_transfer = (U8)wLength;           // send only requested number of data
   }

   while((data_to_transfer != 0) && (!Is_usb_receive_out()))
   {
      while(!Is_usb_read_control_enabled());

      nb_byte=0;
      while(data_to_transfer != 0)              // Send data until necessary
      {
         if(nb_byte++==EP_CONTROL_LENGTH)       // Check endpoint 0 size
         {
            break;
         }
#ifndef __GNUC__
         Usb_write_byte(*pbuffer++);
#else    // AVRGCC does not support point to PGM space
//warning with AVRGCC assumes devices descriptors are stored in the lower 64Kbytes of on-chip flash memory
         Usb_write_byte(pgm_read_byte_near((unsigned int)pbuffer++));
#endif
         data_to_transfer --;
      }
      Usb_send_control_in();
   }

   if(Is_usb_receive_out())
   { 
      // abort from Host
      Usb_ack_receive_out();
      return;
   }
   if(zlp == TRUE)
   { 
      while(!Is_usb_read_control_enabled());
      Usb_send_control_in();
   }

   while(!Is_usb_receive_out());
   Usb_ack_receive_out();
}

---