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Brent W
Silicon Labs Team Member

Reged: Aug 21 2007
Posts: 2
Loc: Austin, TX

Error "Can't generate code for this expression"
#29553 - Fri Sep 07 2007 08:40 PM

Hi,

I'm porting an HID USB mouse example to HI-Tech 8051 ver 9.01 and am getting the error above. I've reduced the code to fit in this post (shows error at 'EP_STATUS[0] = EP_IDLE;' line).

Please use Code tags to maintain formatting and improve code readability. I have added them here. (mod)
Code:

#define  EP_IDLE                 0x00  // This signifies Endpoint Idle State
#define  EP_HALT                 0x03  // Endpoint Halt State (return stalls)

unsigned char EP_STATUS[3] = {EP_IDLE, EP_HALT, EP_HALT};

void Usb_Reset (void);

void main (void) 
{

   Usb_Reset ();

   while (1)                           // Spin forever
   {
   }                        
}

void Usb_Reset (void)
{
   EP_STATUS[0] = EP_IDLE;             // Set default Endpoint Status
   EP_STATUS[1] = EP_HALT;
   EP_STATUS[2] = EP_HALT;
}

Any help would be greatly appreciated.

Thanks,

Brent

Edited by Dan Henry (Sat Sep 08 2007 01:19 PM)

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Dan Henry
Guru

Reged: Oct 16 2003
Posts: 3388
Loc: Boulder, Colorado U.S.A.

Re: Error "Can't generate code for this expression" [Re: Brent W]
#29557 - Sat Sep 08 2007 02:04 PM

It appears to a problem with the small memory model. I think help will have to come directly from support@htsoft.com.

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Dan Henry
Guru

Reged: Oct 16 2003
Posts: 3388
Loc: Boulder, Colorado U.S.A.

Re: Error "Can't generate code for this expression" [Re: Dan Henry]
#29558 - Sat Sep 08 2007 03:05 PM

Quote:

It appears to a problem with the small memory model.

In the small model, static duration objects are supposed to be 'near' by default, I think. Explicitly qualifying EP_STATUS as 'near' fixes the error.

Code:

near unsigned char EP_STATUS[3] = {EP_IDLE, EP_HALT, EP_HALT};

Post Extras:

Brent W
Silicon Labs Team Member

Reged: Aug 21 2007
Posts: 2
Loc: Austin, TX

Re: Error "Can't generate code for this expression" [Re: Dan Henry]
#29577 - Mon Sep 10 2007 12:37 PM

Excellent. Thanks!

-Brent

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