how to read/write shared memory

PF Melamed

Other Parts Discussed in Thread: OMAPL138

Hi,

We are working with omapl138, And we want to read/write data from/to L3 (shared memory) from Both sides (arm, dsp).

In DSP I wrote this programme:

#define MyPtr ((MyStruct_t *)0x80000000)

MyPtr->a = 0;

MyPtr->b = 1; etc

Question please:

can you please give me a simple programme siting in ARM (using the linux) doing the same work?

Thanks

0 SRiva over 13 years ago

In order to read/write from shared memory you have to use the "cache invalidate" and "write back" functions from both DSP and ARM side.

Here some info:

Search for "CACHE_invL1d" and "CACHE_wbL1d" in your CSL code

0 PF Melamed over 13 years ago in reply to SRiva

Thanks Samuele,

I don't think I need to use "cache invalidate" and "write back" functions,

Like I wrote in DSP is very simple for me. I have CCS5 and I have the possibility to check the L3 memory (0x80000000) by the

memory browser, but how can I to read write in this addr (0x8000000) from ARM.

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