On Nov 20, 2010, at 1:35 PM, Peter Bigot wrote:
> A single report is fine. Thanks.
Will do!
> Yes, it appears the USB section of RAM was not incorporated in the device
> list I got from TI, so you should be safe from potential assignment
> collisions.
That's probably a pretty safe default behavior, since I would expect it to be
uncommon for people to build for the USB-capable variants without using the USB
hardware.
> I'll look at the linker scripts in Code Composer when I deal with the bug,
> but if that's the model they use those chips will always have a USB memory
> section defined, and if you want to use it as normal RAM you'll have to
> assign variables to it explicitly using the section attribute.
That sounds reasonable.
> You could probably avoid the assembler file with a simple:
>
> uint8_t USBMEM[2048] asm("0x1c00");
It'll take a few more lines than that since variables are defined for various
endpoint buffers within the USB RAM, but that general technique looks like a
clean way to handle it. The original code looks like this:
#ifdef __IAR_SYSTEMS_ICC__
#pragma location = 0x2380
__no_init tDEVICE_REQUEST __data16 tSetupPacket;
#pragma location = 0x0920
__no_init tEDB0 __data16 tEndPoint0DescriptorBlock;
[...]
#pragma location = OEP1_X_BUFFER_ADDRESS
__no_init BYTE __data16 pbXBufferAddressEp1[EP_MAX_PACKET_SIZE];
[...]
#endif
#ifdef __TI_COMPILER_VERSION__
extern __no_init tDEVICE_REQUEST tSetupPacket;
extern __no_init tEDB0 tEndPoint0DescriptorBlock;
[...]
#endif
I'm presently using something like the __TI_COMPILER_VERSION__ block of extern
declarations with the symbols defined with .set directives in an assembly file.
I'll try doing it more like the __IAR_SYSTEMS_ICC__ block, using the asm
directives in place of the pragmas. I may be able to ignore the __no_init and
__data16 stuff since the linker shouldn't be allocating storage space. Back to
the Secret Laboratory for more experiments!
--
Mark J. Blair, NF6X <n...@nf6x.net>
Web page: http://www.nf6x.net/
GnuPG public key available from my web page.
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