//! @file usb_drv.c,v
//!
//! Copyright (c) 2006 Atmel.
//!
//! Use of this program is subject to Atmel's End User License Agreement.
//! Please read file license.txt for copyright notice.
//!
//! @brief This file contains the USB driver routines.
//!
//! This file contains the USB driver routines.
//!
//! @version 1.11 at90usb128-demo-audio-1_0_2 $Id: usb_drv.c,v 1.11 2006/07/27 07:02:03 rletendu Exp $
//!
//! @todo
//! @bug

//_____ I N C L U D E S ____________________________________________________

#include "config.h"
#include "conf_usb.h"
#include "usb_drv.h"

//_____ M A C R O S ________________________________________________________

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

#if (USB_DEVICE_FEATURE==DISABLED && USB_HOST_FEATURE==DISABLED)
   #error at least one of  USB_DEVICE_FEATURE or USB_HOST_FEATURE should be unabled
#endif

#if (USB_DEVICE_FEATURE == ENABLED)

//! usb_configure_endpoint.
//!
//!  This function configures an endpoint with the selected type.
//!
//!
//! @param config0
//! @param config1
//!
//! @return Is_endpoint_configured.
//!
U8 usb_config_ep(U8 config0, U8 config1)
{
    Usb_enable_endpoint();
    UECFG0X = config0;
    UECFG1X = (UECFG1X & (1<<ALLOC)) | config1;
    Usb_allocate_memory();
    return (Is_endpoint_configured());
}

//! usb_select_endpoint_interrupt.
//!
//! This function select the endpoint where an event occurs and returns the
//! number of this endpoint. If no event occurs on the endpoints, this
//! function returns 0.
//!
//!
//! @param none
//!
//! @return endpoint number.
//!
U8 usb_select_enpoint_interrupt(void)
{
U8 interrupt_flags;
U8 ep_num;

   ep_num = 0;
   interrupt_flags = Usb_interrupt_flags();

   while(ep_num < MAX_EP_NB)
   {
      if (interrupt_flags & 1)
      {
         return (ep_num);
      }
      else
      {
         ep_num++;
         interrupt_flags = interrupt_flags >> 1;
      }
   }
   return 0;
}

//! usb_send_packet.
//!
//! This function moves the data pointed by tbuf to the selected endpoint fifo
//! and sends it through the USB.
//!
//!
//! @param ep_num       number of the addressed endpoint
//! @param *tbuf        address of the first data to send
//! @param data_length  number of bytes to send
//!
//! @return address of the next U8 to send.
//!
//! Example:
//! usb_send_packet(3,&first_data,0x20);    // send packet on the endpoint #3
//! while(!(Usb_tx_complete));              // wait packet ACK'ed by the Host
//! Usb_clear_tx_complete();                     // acknowledge the transmit
//!
//! Note:
//! tbuf is incremented of 'data_length'.
//!
U8 usb_send_packet(U8 ep_num, U8* tbuf, U8 data_length)
{
U8 remaining_length;

   remaining_length = data_length;
   Usb_select_endpoint(ep_num);
   while(Is_usb_write_enabled() && (0 != remaining_length))
   {
      Usb_write_byte(*tbuf);
      remaining_length--;
      tbuf++;
   }
   return remaining_length;
}

//! usb_read_packet.
//!
//! This function moves the data stored in the selected endpoint fifo to
//! the address specified by *rbuf.
//!
//!
//! @param ep_num       number of the addressed endpoint
//! @param *rbuf        aaddress of the first data to write with the USB data
//! @param data_length  number of bytes to read
//!
//! @return address of the next U8 to send.
//!
//! Example:
//! while(!(Usb_rx_complete));                      // wait new packet received
//! usb_read_packet(4,&first_data,usb_get_nb_byte); // read packet from ep 4
//! Usb_clear_rx();                                 // acknowledge the transmit
//!
//! Note:
//! rbuf is incremented of 'data_length'.
//!
U8 usb_read_packet(U8 ep_num, U8* rbuf, U8  data_length)
{
U8 remaining_length;

   remaining_length = data_length;
   Usb_select_endpoint(ep_num);

   while(Is_usb_read_enabled() && (0 != remaining_length))
   {
      *rbuf = Usb_read_byte();
      remaining_length--;
      rbuf++;
   }
   return remaining_length;
}

//! usb_halt_endpoint.
//!
//! This function sends a STALL handshake for the next Host request. A STALL
//! handshake will be send for each next request untill a SETUP or a Clear Halt
//! Feature occurs for this endpoint.
//!
//! @param ep_num number of the addressed endpoint
//!
//! @return none
//!
void usb_halt_endpoint (U8 ep_num)
{
   Usb_select_endpoint(ep_num);
   Usb_enable_stall_handshake();
}

//! usb_init_device.
//!
//! This function initializes the USB device controller and
//! configures the Default Control Endpoint.
//!
//!
//! @param none
//!
//! @return status
//!
U8 usb_init_device (void)
{
   Usb_select_device();
   if(Is_usb_id_device())
   {
      Usb_select_endpoint(EP_CONTROL);
      if(!Is_usb_endpoint_enabled())
      {
#if (USB_LOW_SPEED_DEVICE==DISABLE)
         return usb_configure_endpoint(EP_CONTROL,    \
                                TYPE_CONTROL,  \
                                DIRECTION_OUT, \
                                SIZE_64,       \
                                ONE_BANK,      \
                                NYET_DISABLED);
#else
         return usb_configure_endpoint(EP_CONTROL,    \
                                TYPE_CONTROL,  \
                                DIRECTION_OUT, \
                                SIZE_8,       \
                                ONE_BANK,      \
                                NYET_DISABLED);
#endif
      }
   }
   return FALSE;
}

#endif

//! ---------------------------------------------------------
//! ------------------ HOST ---------------------------------
//! ---------------------------------------------------------

#if (USB_HOST_FEATURE == ENABLED)

//! usb_configure_pipe.
//!
//!  This function configures a pipe with the selected type.
//!
//!
//! @param config0
//! @param config1
//!
//! @return Is_endpoint_configured.
U8 host_config_pipe(U8 config0, U8 config1)
{
    Host_enable_pipe();
    UPCFG0X = config0;
    UPCFG1X = config1;
    Host_allocate_memory();
    return (Is_pipe_configured());
}

//! host_determine_pipe_size.
//!
//!  This function returns the size configuration register value according
//!  to the endpint size detected inthe device enumeration process.
//!
//! @return pipe size register value.
//!
U8 host_determine_pipe_size(U16 size)
{
        if(size <= 8  ) {return (SIZE_8   );}
   else if(size <= 16 ) {return (SIZE_16  );}
   else if(size <= 32 ) {return (SIZE_32  );}
   else if(size <= 64 ) {return (SIZE_64  );}
   else if(size <= 128) {return (SIZE_128 );}
   else if(size <= 256) {return (SIZE_256 );}
   else if(size <= 512) {return (SIZE_512 );}
   else                 {return (SIZE_1024);}

}

//! host_disable_all_pipe.
//!
//!  This function disable all pipes for the host controller
//!  Usefull to execute upon device disconnection.
//!
//! @return none.
//!
void host_disable_all_pipe(void)
{
U8 i;
   for (i=0;i<7;i++)
   {
      Host_reset_pipe(i);
      Host_select_pipe(i);
      Host_unallocate_memory();
      Host_disable_pipe();
   }
}

//! @brief Returns the pipe number that generates a USB communication interrupt
//!
//! This function sould be called only when an interrupt has been detected. Otherwize
//! the return value is incorect
//!
//! @param none
//!
//! @return pipe_number
//!
U8 usb_get_nb_pipe_interrupt(void)
{
U8 interrupt_flags;
U8 i;

   interrupt_flags = Host_get_pipe_interrupt();
   for(i=0;i< MAX_EP_NB;i++)
   {
      if (interrupt_flags & (1<<i))
      {
         return (i);
      }
   }
   // This return should never occurs ....
   return MAX_EP_NB+1;
}


#endif   // USB_HOST_FEATURE == ENABLED