C6678 Notify callback priority

murad qahwash

I am using Notify module in core 0 of C6678 to notify other cores of available block of data (3072 int) in shared memory so they can read to local buffer. The data in core 0 gets updated every 6 ms and hence, other cores need to be notified as soon as possible. What is the latency of Notify? and what is the priority of the Notify callback compared to HWI, SWI, Tasks?

I am following the IPC users guide:

Notify_registerEvent(armProcId, 0, EVENTID, (Notify_FnNotifyCbck)cbFxn, 0x1010);

Void cbFxn(UInt16 procId, UInt16 lineId, UInt32 eventId,

UArg arg, UInt32 payload);

Regards,

Murad

over 10 years ago

0 murad qahwash over 10 years ago

Genius 3770 points

BIOS-MCSDK user guide 2.1 page 36 shows that the IPC latency using shared memory transport is 2402 cycles. is this the latency I should expect when sending a Notify from one core to another?...Still not sure about the priority...

0 Shankari G over 10 years ago in reply to murad qahwash

TI__Mastermind 43955 points

Hi Murad,

How about using messgae priorities through MessageQ? Chapter 2.3.8 Message Priorities in IPC_user guide.

Regards,
Shankari

0 murad qahwash over 10 years ago in reply to Shankari G

Genius 3770 points

Thank you Shankari for your reply!

btw: it is section 3.3.8 :-)

I will give it a try...should I use MessageQ to send the actual data (3072 int) to the other cores or just as a flag and use shared memory to share the data.
I have another post explaining my issue but no one replied in long time!...please help if you can!

e2e.ti.com/.../1417366

Regards,

Murad

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C6678 Notify callback priority