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Static array declaration crashes application.

henk van winkoop over 13 years ago

Hi,

I'm using Keil IDE V4.23.00.00.0.

If I declare some static array in module A like:
volatile static unsigned char MyArray[9]
then all works fine.

If I declare it like:
volatile static unsigned char MyArray[8]
then another module B generates a HARD FAULT interrupt.

Module B does not use or has any connection with module A.

If I look in the .map file I see:

MyArray[9]

.bss                        0x20003a40   Section      500  f991_dma1forusart2.o(.bss)
.bss                        0x20003c34   Section        9  fa30_pccommunicator.o(.bss)
MyArray                     0x20003c34   Data           9  fa30_pccommunicator.o(.bss)
.bss                        0x20003c40   Section       96  libspace.o(.bss)
HEAP                        0x20003ca0   Section      512  startup_stm32f10x_xl.o(HEAP)

MyArray[8]

l_fpComShtRcvStsRepOptSkt   0x20000224   Data           4  fa30_pccommunicator.o(.data)
MyArray                     0x20000228   Data           8  fa30_pccommunicator.o(.data)
.data                       0x20000230   Section      351  fa40_comsheet.o(.data)

so there definitely seems to be a difference in interpretation as with the faulty [8] no '.bss' is used which according Wikipedia has to too with static declarations.

Who can help me out?

Thanks,

Henk