f34x_usb_standard_requests.c

学习usb编程很好的例子 自己学习用的。

      {
         Force_Stall();                         // Send procedural stall
      }
   }
   POLL_WRITE_BYTE(INDEX, 0);
   if (Ep_Status[0] != EP_STALL)
   {
      // Indicate setup packet has been serviced
      POLL_WRITE_BYTE(E0CSR, rbSOPRDY);
   }
}

//-----------------------------------------------------------------------------
// Set_Address
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// Set new function address
//
//-----------------------------------------------------------------------------

void Set_Address(void)                          
{
   if ((Setup.bmRequestType != IN_DEVICE)     ||// Request must be directed to device
   Setup.wIndex.c[MSB]  || Setup.wIndex.c[LSB]||// with index and length set to zero.
   Setup.wLength.c[MSB] || Setup.wLength.c[LSB]||
   Setup.wValue.c[MSB]  || (Setup.wValue.c[LSB] & 0x80))
   {
     Force_Stall();                             // Send stall if setup data invalid
   }

   Ep_Status[0] = EP_ADDRESS;                   // Set endpoint zero to update address next status phase
   if (Setup.wValue.c[LSB] != 0)
   {
      USB_State = DEV_ADDRESS;                  // Indicate that device state is now address
   }
   else
   {
      USB_State = DEV_DEFAULT;                  // If new address was 0x00, return device to default
   }                                            // state
   if (Ep_Status[0] != EP_STALL)
   {
      // Indicate setup packet has been serviced
      POLL_WRITE_BYTE(E0CSR, rbSOPRDY);
   }
}

//-----------------------------------------------------------------------------
// Get_Descriptor
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This routine sets the data pointer and size to correct 
// descriptor and sets the endpoint status to transmit
//
//-----------------------------------------------------------------------------

void Get_Descriptor(void)                       
{                                              

   switch(Setup.wValue.c[MSB])                  // Determine which type of descriptor
   {                                            // was requested, and set data ptr and
      case DSC_DEVICE:                          // size accordingly
         DataPtr = (BYTE*) &DeviceDesc;
         DataSize = DeviceDesc.bLength;
         break;

      case DSC_CONFIG:
         DataPtr = (BYTE*) &ConfigDesc;
                                                // Compiler Specific - The next statement reverses the
                                                // bytes in the configuration descriptor for the compiler
         DataSize = ConfigDesc.wTotalLength.c[MSB] + 256*ConfigDesc.wTotalLength.c[LSB];
         break;

      case DSC_STRING:
         DataPtr = StringDescTable[Setup.wValue.c[LSB]];
                                                // Can have a maximum of 255 strings
         DataSize = *DataPtr;
         break;

      case DSC_INTERFACE:
         DataPtr = (BYTE*) &InterfaceDesc;
         DataSize = InterfaceDesc.bLength;
         break;

      case DSC_ENDPOINT:
         if ((Setup.wValue.c[LSB] == IN_EP1) ||
         (Setup.wValue.c[LSB] == OUT_EP2))
         {
            if (Setup.wValue.c[LSB] == IN_EP1)
            {
               DataPtr = (BYTE*) &Endpoint1Desc;
               DataSize = Endpoint1Desc.bLength;
            }
            else
            {
               DataPtr = (BYTE*) &Endpoint2Desc;
               DataSize = Endpoint2Desc.bLength;
            }
         }
         else
         {
            Force_Stall();
         }
         break;

      default:
         Force_Stall();                         // Send Stall if unsupported request
         break;
   }

   if (Setup.wValue.c[MSB] == DSC_DEVICE ||     // Verify that the requested descriptor is
   Setup.wValue.c[MSB] == DSC_CONFIG     ||     // valid
   Setup.wValue.c[MSB] == DSC_STRING     ||
   Setup.wValue.c[MSB] == DSC_INTERFACE  ||
   Setup.wValue.c[MSB] == DSC_ENDPOINT)
   {
      if ((Setup.wLength.c[LSB] < DataSize) &&
      (Setup.wLength.c[MSB] == 0))
      {
         DataSize = Setup.wLength.i;       // Send only requested amount of data
      }
   }
   if (Ep_Status[0] != EP_STALL)                // Make sure endpoint not in stall mode
   {
     POLL_WRITE_BYTE(E0CSR, rbSOPRDY);          // Service Setup Packet
     Ep_Status[0] = EP_TX;                      // Put endpoint in transmit mode
     DataSent = 0;                              // Reset Data Sent counter
   }
}

//-----------------------------------------------------------------------------
// Get_Configuration
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This routine returns current configuration value
//
//-----------------------------------------------------------------------------

void Get_Configuration(void)                   
{
   if ((Setup.bmRequestType != OUT_DEVICE)    ||// This request must be directed to the device
   Setup.wValue.c[MSB]  || Setup.wValue.c[LSB]||// with value word set to zero
   Setup.wIndex.c[MSB]  || Setup.wIndex.c[LSB]||// and index set to zero
   Setup.wLength.c[MSB] || (Setup.wLength.c[LSB] != 1))// and setup length set to one
   {
      Force_Stall();                            // Otherwise send a stall to host
   }

   else
   {
      if (USB_State == DEV_CONFIGURED)          // If the device is configured, then return value 0x01
      {                                         // since this software only supports one configuration
         DataPtr = (BYTE*)&ONES_PACKET;
         DataSize = 1;
      }
      if (USB_State == DEV_ADDRESS)             // If the device is in address state, it is not
      {                                         // configured, so return 0x00
         DataPtr = (BYTE*)&ZERO_PACKET;
         DataSize = 1;
      }
   }
   if (Ep_Status[0] != EP_STALL)
   {
      POLL_WRITE_BYTE(E0CSR, rbSOPRDY);         // Set Serviced Out Packet bit
      Ep_Status[0] = EP_TX;                     // Put endpoint into transmit mode
      DataSent = 0;                             // Reset Data Sent counter to zero
   }
}

//-----------------------------------------------------------------------------
// Set_Configuration
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This routine allows host to change current device configuration value
//
//-----------------------------------------------------------------------------

void Set_Configuration(void)                   
{                                               

   if ((USB_State == DEV_DEFAULT)             ||// Device must be addressed before configured
   (Setup.bmRequestType != IN_DEVICE)         ||// and request recipient must be the device
   Setup.wIndex.c[MSB]  || Setup.wIndex.c[LSB]||// the index and length words must be zero
   Setup.wLength.c[MSB] || Setup.wLength.c[LSB] ||
   Setup.wValue.c[MSB]  || (Setup.wValue.c[LSB] > 1))// This software only supports config = 0,1
   {
      Force_Stall();                            // Send stall if setup data is invalid
   }

   else
   {
      if (Setup.wValue.c[LSB] > 0)              // Any positive configuration request
      {                                         // results in configuration being set to 1
         USB_State = DEV_CONFIGURED;
         Ep_Status[1] = EP_IDLE;                // Set endpoint status to idle (enabled)
         Ep_Status[2] = EP_IDLE;
         POLL_WRITE_BYTE(INDEX, 1);             // Change index to endpoint 1
         POLL_WRITE_BYTE(EINCSR2, rbInDIRSEL);  // Set DIRSEL to indicate endpoint 1 is IN
         Handle_In1();                          // Put first data packet on fifo
         POLL_WRITE_BYTE(INDEX, 0);             // Set index back to endpoint 0
      }
      else
      {
         USB_State = DEV_ADDRESS;               // Unconfigures device by setting state to
         Ep_Status[1] = EP_HALT;                // address, and changing endpoint 1 and 2
         Ep_Status[2] = EP_HALT;                // status to halt
      }
   }
   if (Ep_Status[0] != EP_STALL)
   {
      // Indicate setup packet has been serviced
      POLL_WRITE_BYTE(E0CSR, rbSOPRDY);
   }
}

//-----------------------------------------------------------------------------
// Get_Interface
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This routine returns 0x00, since only one interface is supported by 
// this firmware
//
//-----------------------------------------------------------------------------

void Get_Interface(void)                        
{                                              

   if ((USB_State != DEV_CONFIGURED)      ||    // If device is not configured
   (Setup.bmRequestType != OUT_INTERFACE) ||    // or recipient is not an interface
   Setup.wValue.c[MSB]  ||Setup.wValue.c[LSB] ||// or non-zero value or index fields
   Setup.wIndex.c[MSB]  ||Setup.wIndex.c[LSB] ||// or data length not equal to one
   Setup.wLength.c[MSB] ||(Setup.wLength.c[LSB] != 1))
   {
      Force_Stall();                            // Then return stall due to invalid request
   }

   else
   {
      DataPtr = (BYTE*)&ZERO_PACKET;            // Otherwise, return 0x00 to host
      DataSize = 1;
   }
   if (Ep_Status[0] != EP_STALL)
   {
      POLL_WRITE_BYTE(E0CSR, rbSOPRDY);         // Set Serviced Setup packet, put endpoint in transmit
      Ep_Status[0] = EP_TX;                     // mode and reset Data sent counter
      DataSent = 0;
   }
}

//-----------------------------------------------------------------------------
// Set_Interface
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This routine allows host to change current device configuration value
//
//-----------------------------------------------------------------------------

void Set_Interface(void)
{
   // Make sure request is directed at interface and all other packet values 
   // are set to zero

   if ((Setup.bmRequestType != IN_INTERFACE)  ||
   Setup.wLength.c[MSB] ||Setup.wLength.c[LSB]|| 
   Setup.wValue.c[MSB]  ||Setup.wValue.c[LSB] ||
   Setup.wIndex.c[MSB]  ||Setup.wIndex.c[LSB])
   {
      // Otherwise send a stall to host
      Force_Stall();                            
   }
   if (Ep_Status[0] != EP_STALL)
   {
      // Indicate setup packet has been serviced
      POLL_WRITE_BYTE(E0CSR, rbSOPRDY);                                               
   }
}

//-----------------------------------------------------------------------------
// End Of File
//-----------------------------------------------------------------------------