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Altera_Forum
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15 years ago

Code in tightly coupled memory

Hi all, I placed a function in a section different from the main code. More exactly, my code is mapped to sdram and I linked a function testcall() into a tightly coupled memory section which I pr...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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Did you use the custom opcode for interrupt vectors? It changes interrupt response an opcode to do the dispatch from a C function to lookup the vector.

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Sry, I don't understand this. What do you mean with custom optcode ? Taking the whole bunch of the ISR directly in the VIC, so that I don't need alt_irq_register ?

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OSSemPost and OSSemPend delays are part of uC/OS-II. Unless you don't have compiler optimization on (-O2 or -O3) there's not much you can do - unless you put ossempost and ossempend in tcm.

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Sounds good to me! Can you explain me in few words how to accomplish this, please ?

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I use custom opcode for int vectors and O3 optimization level.

Then I believe R2-D2 does, too.

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The timings are based on standard IIC (no VIC) and -O0 optimations. So, I haven't done any optimations yet.

Thanks for your comments

Regards,

R2-D2