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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
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15 years ago

Hi R2-D2,

I have exactly the same situation you described: code placement, RTOS, even same isr and OSSem usage.

So, my response times are similar, too.

In addition, I use NicheStack for TCP/IP and when I load the system with network traffic I have worst case response times up to 150us.

In these cases I also see an increase in isr response to about 40us: I think this is due to OS (or TCP stack) disabling irq in some critical pieces of code.

I wrote a post asking if this behaviour is normal, but I had no answers.

For BillA

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

Then I believe R2-D2 does, too.

Regards

Cris