Lpc2000

Ok.
I really need a USB code running in gcc and a don't have children but 
want to someday.
So, I'' post all my findings here, and what i got. Hopefully somebody 
will try this, do some more progress and share it back here.

As far as I know the main problem porting keil USBMEM to gcc is the 
__pack attribute.
I know keil code is not that complete, but once it is up and running 
will be easier to work in robustness.

Since I don't know if there is some problem in posting the whole code, 
i'm telling what i've changed.

hopefully i did not forget any changes, but if so, ask.



//----------------------------------------------------------------------------------------------------------
*makefile*
be sure that your compiler flags include:
  -fpack-struct

//----------------------------------------------------------------------------------------------------------
*diskimg.c*
replace :
  const unsigned char DiskImage[MSC_ImageSize] __at MSC_ImageStart = {
with:
  const unsigned char DiskImage[MSC_ImageSize] = {
i haven't analised the MSC doe yet, but so far i thing this is harmless

//----------------------------------------------------------------------------------------------------------
*usbhw.h*
add this line:
    #define __irq __attribute__((interrupt))

//----------------------------------------------------------------------------------------------------------
*mscuser.c
*replace:
  BYTE  Memory[MSC_MemorySize] __at MSC_MemoryStart;   // MSC RAM
with:
  BYTE  Memory[MSC_MemorySize];   // MSC RAM
*
*//----------------------------------------------------------------------------------------------------------
*usbcore.c*
replace:
  (BYTE *)pD += ((USB_CONFIGURATION_DESCRIPTOR *)pD)->wTotalLength;
with:
  pD = (USB_COMMON_DESCRIPTOR*)(((BYTE *)pD) + 
((USB_CONFIGURATION_DESCRIPTOR *)pD)->wTotalLength);
and
replace:
  (BYTE *)pD += pD->bLength;
with:
  pD = (USB_COMMON_DESCRIPTOR*)(((BYTE *)pD) + pD->bLength);
both appears twice in the file
I'm in this point now, but i think this generates good code.

//----------------------------------------------------------------------------------------------------------
*usbhw.c*
replace:
  *((__packed DWORD *)pData) = RX_DATA;
  pData += 4;
with:
      DWORD w;
      w = RX_DATA;
      *pData++ = (w    )&0xff;
      *pData++ = (w>>8 )&0xff;
      *pData++ = (w>>16)&0xff;
      *pData++ = (w>>24)&0xff;
and
replace:
  TX_DATA = *((__packed DWORD *)pData);
  pData += 4;
with:
      DWORD x;
      x  =  (*pData++);
      x  |= (*pData++)<<8;
      x  |= (*pData++)<<16;
      x  |= (*pData++)<<24;
      TX_DATA = x;

//----------------------------------------------------------------------------------------------------------
*usbuser.c*
replace:
   #define P_EP(n) ((USB_EP_EVENT & (1 << (n))) ? USB_EndPoint##n : NULL)
with:
   #define P_EP(n) ((USB_EP_EVENT & (1 << (n))) ? (void*)USB_EndPoint##n 
: NULL)
and
replace:
   const void (* USB_P_EP[16]) (DWORD event)=
with:
   const void (* const USB_P_EP[16]) (DWORD event)=

//----------------------------------------------------------------------------------------------------------
*usbuser.h*
replace:
   extern const void (* USB_P_EP[16]) (DWORD event)=
with:
   extern const void (* const USB_P_EP[16]) (DWORD event)=

//----------------------------------------------------------------------------------------------------------

Mauricio






























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