C5510 simple Read from EMIF Address

Christoph Gulich

Hello ,

i am using the c5510 with C as programming language. I want to access on extern flash over EMIF. The EMif is correct initialized and I could read the correct Flash values

in the Memory Window. I have also Assembler Code where the function works fine. My problem is to find the correct "cast" to readout the data.

Uint16* src_ptr;

Uint16 data;

src_ptr= ((Uint16*)((0x240000L)));

data = *src_ptr;

I think that should work but it doesnt.

Thank you for informations!!!!!

Christoph

over 15 years ago

0 Archaeologist over 15 years ago

TI__Guru* 84285 points

Are you using large memory model? If not, the value 0x240000 will be truncated to 16 bits.

Is 0x240000 the byte address or the word address? If it is the byte address, you will need to scale it down by 2 to make it a word address, since you are trying to initialize a data pointer, which takes word address values.

0 Christoph Gulich over 15 years ago in reply to Archaeologist

Prodigy 20 points

Its a word adressing. How can I access to the extendent address space ??? To extern register all is fine via ioport but to EMIF ??? Yes the 16 bit address is truncated !!!!

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C5510 simple Read from EMIF Address