CCS/CC3220SF: Time synchronization over WiFi

Rejin Jacob

Part Number: CC3220SF
Other Parts Discussed in Thread: CC3200, CC3220S

Tool/software: Code Composer Studio

I have 2 CC3220SF board each connected to an AP (of a laptop) over wifi. Each of these boards have sensors. I want the Board to capture the sensors readings at the exact same time (with an accuracy of about +-1ms max).

what other approaches can be used to achieve this. I have already considered NTP, SNTP and PTP. PTP will be good but there is no example in the SDK

over 5 years ago

0 Jan D over 5 years ago

Guru 80025 points

Hi,

Though you will not find there solution of you issue, please read this thread. All thing at that thread related to CC3200 are related to CC3220SF as well.

Jan

0 Rejin Jacob over 5 years ago

Intellectual 310 points

This a website I found. where the guy implements PTPd on TI Rtos

https://sheldoninstruments.com/porting-ptpd-to-an-embedded-real-time-operating-system/

Can any one help me with the porting.

0 Hnz over 5 years ago in reply to Rejin Jacob

Guru 39650 points

Hi,

It seems that implementation described in the article does use NDK socket layer. That mean even if you will had source code of that implementation, you will need port from NDK to SimpleLink driver. I will not be able to help with this porting. This will be up to you.

After quick look to source code of PTPd it looks that this code can be ported to CC3220 device. But this will not be a job for a few hours.

Jan

0 Rejin Jacob over 5 years ago in reply to Hnz

Intellectual 310 points

So I will have to do 2 things

1) Port NDK socket layer to SimpleLink driver

2) port PTPd library to CC3220S

Am I right ?

0 Jan D over 5 years ago in reply to Rejin Jacob

Guru 80025 points

Hi,

Original version does not use NDK socket layer. They will be required many other steps during porting:

study and understood how PTPd code is designed and PTP works
change from socket layer used at PTPd to SimpleLink layer (this should be easy task, because both layers are based on BSD sockets - net.c file in PTPd)
determine whether at PTPd code are not used features not supported by CC3220 (e.g. unsupported socket options, etc.)
implement hardware related time features used at PTPd (e.g. timer)
remove unused features (e.g. SNMP)

Jan

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CCS/CC3220SF: Time synchronization over WiFi