Hi,
Background:
I've got a piece of code (USB HID and then some) that works.
Now I'm moving this to work with a UBS bootloader that allows
me to update the code via USB.
The bootloader naturally lives at 0x0000 so I've relocated
my code to 0x0800 by including a custom crt0iz.c which
locates the start up code to 0x0800 and I've changed
my linker file like this:
CODEPAGE NAME=vectors START=0x0800 END=0x829
PROTECTED
CODEPAGE NAME=page START=0x082A END=0x7FFF
The works bootloader and loading the code works.
Also the bootloader starts my code and it starts, even
the interrupts seem to run ok.
However, it crashes at this line:
memcpyram2ram(&hid_tx_buffer, &g_toad4_status, 64);
(There is also something else wrong as the USB code
does not work, ie my device does not get enumerated).
This particular piece of hw I'm doing this on only
has one LED to help in debugging so I'm sort of
stabbing in the dark.
Here is what the .map says about those two variables
concerned in the crashing line.
_hid_tx_buffer 0x0005b0 data extern
../obj/usb_core.asm
_g_toad4_status 0x000060 data extern ../obj/main.asm
How do I know this is where it crashes? I insert a LED blink before
that line and it blinks, put it after that, and it won't.
My SDCC is:
nyholkus-MacBook-Pro:src nyholku$ /Users/nyholku/sdcc-3.2.0/bin/sdcc -v
SDCC :
mcs51/gbz80/z80/z180/r2k/r3ka/ds390/pic16/pic14/TININative/ds400/hc08/s08
3.2.0 #8008 (Jul 6 2012) (Mac OS X i386)
Any ideas how can memcpyram2ram crash?
br Kusti
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