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Altera_Forum's avatar
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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Problems:

1. ISR response takes ~16 µs.

2. From OSSemPost, in the ISR, to OSSemPend, in task, it takes ~34 µs.

Any chances to reduce these times ?

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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.

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.

Bill