Posted on May 17, 2011 at 09:35Hello at all,
I use Keil MDK 3.04 in 2 target configurations:
1. Download to FLASH
Code : 0x0000000-0x0088000 512 KByte FLASH
Data : 0x4000000-0x4018000 96 KByte SRAM
2. Download to RAM
Code : 0x0000000-0x0000400 1 KByte FLASH
Code : 0x4000000-0x0010000 64 KByte SRAM
Data : 0x4010000-0x4018000 32 KByte SRAM
The first configuration is for the destination target,
but if I use it for debugging, I can only have 2
hardware breakpoints.
The second configuration is only for debugging with so many
breakpoints I want. The first code page in FLASH is needed
for the reset and interrupt vectors and some initialisation
code required from the code in the Keil Str9x.s startup file.
Now my question :
In the Keil Str9x.s startup file I can enable/disable the PQFBC
feature of the STR912 micro.
In my first configuration (Download to Flash) everything is fine,
and working, PQFBC enabled or disabled.
In my second configuration (Download to RAM) only disabled PFQBC
is working, enabling the PQFBC crashed the application.
After some checks, I rich the size of the first area,
Code : 0x0000000-0x006000 xx KBytes FLASH), with the
result, that my timer interrupt function are running not more
in SRAM and now running in FLASH, the application don't
crashed any more.
Can someone explain me this behavour, and how can I use the
PQFBC feature running completely in RAM.
Best regards
D.
