S32E2 IPCF latency timings between M33 and R52

[PrabhanjanKopp]

I am working with S32E2 and configuring the IPCF framework and here is my setup

• Device: S32E288
• IPCF transport: Shared Memory + MRU notification
• Communication: M33 ↔ R52
• IPCF channel type: Managed channel
• 1 IPCF channel configured
• Interrupt mode (not polling)
• Ping/Pong RTT test implemented

Communication is functioning correctly in both directions.

I use STM to measure the timing ticks between the 2 cores.

Measurement flow:

R52:

timestamp

send PING

M33:

receive PING

immediately send PONG from RX callback

R52:

receive PONG

compute RTT

The values computed for a STM running on 24Mhz are close to 200us RTT(Round trip time). My transport overhead is about 30us but the transfer itself takes up bulk of the time. I have tried various things like increasing MRU IRQ notification but has not improved the timings. Having optimisation in code from -o0 to -o1 helped but -o2 didnt make any difference. The payload itself is 16 bytes.

Questions:
1. what is expected IPCF latency for managed /unmanaged channels.

2. can we acheive a low double digit latency?

If you need any more details, please reply back.

[Joey_z]

Hi,PrabhanjanKopp

Thank you for contacting us.

For your testing scenario, you can try to refer to GreenVIP. The Loop Time is about 20-30us.(S32ZE_GreenVIP_1.x.1/doc/UG_S32ZE_GreenVIP.pdf)

If you have other issue, you can contact us at any time.

BR

Joey

[PrabhanjanKopp]

Hi Joey,

Thank you for your reply. I am using S32 DS for setting up my cores and was wondering is GreenVIP is any different? Also , it will be most helpful to get the document link(or the doc itself)  that you referring in your message. Is there a reference project that I can compare my settings against? I suspect there might be some configuration mismatch.

Thanks,

Prabhanjan

[Joey_z]

Hi,Prabhanjan

Thank you for your reply.

The link of GreenVIP download as the following:

S32E2 Safe and Secure High-Performance Real-Time Processors with Actuation Support | NXP Semiconduct...

Automotive Software Package Manager | NXP Semiconductors

The EB tresos IDE is used for the GreenVIP, both S32DS and EB tresos can be used to develop applications for S32E. Hope this information can help you; you can contact us at any time if you still have question about this.

BR

Joey

[PrabhanjanKopp]

Thank you for that. I found that I can get the timings down when I switch to unmanaged channel. It is close to 60us . Will see if I can get it further down. 

[Joey_z]

Hi,PrabhanjanKopp

Thank you for your reply and information.

For the 60us result, was it tested by your customer program or by our Greenvip?

BR

Joey