Configure PTP_Timescale parameter

Question

I am using ptp4l on linux machine. Currently, in the pcap trace I can see that the flag for PTP_Timescale is set to False. Is there anyway, that I can configure the PTP_Timescale parameter and set it to True?

Answer 1

The pmc tool may be the answer you are looking for (I think the pmc tool is included in the linuxptp package).

First Step:

Let's try and read your current configuration using the pmc tool:

sudo pmc -u -b 0 'GET GRANDMASTER_SETTINGS_NP' 

You should get a response in this structure:

sending: GET GRANDMASTER_SETTINGS_NP                                           
        020e06.fffe.814208-0 seq 0 RESPONSE MANAGEMENT GRANDMASTER_SETTINGS_NP 
                clockClass              255                                    
                clockAccuracy           0x21                                   
                offsetScaledLogVariance 0x436a                                 
                currentUtcOffset        37                                     
                leap61                  0                                      
                leap59                  0                                      
                currentUtcOffsetValid   1                                      
                ptpTimescale            0                                      
                timeTraceable           0                                      
                frequencyTraceable      0                                      
                timeSource              0xa0   

                            

Second Step:

Let's modify the timeTraceable flag to 1 using a pmc command (please note that I'm not changing the other flags - I'm writing the same values I've just read, except the timeTraceable that we want to change):

sudo pmc -u -b 0 "SET GRANDMASTER_SETTINGS_NP clockClass 255 \
            clockAccuracy 0x21 offsetScaledLogVariance 0x436a \
            currentUtcOffset 37 leap61 0 leap59 0 currentUtcOffsetValid 1 \
            ptpTimescale 1 timeTraceable 0 frequencyTraceable 0 \
            timeSource 0xa0"

I hope this will do the job. If it doesn't help, try have a look at this links for more details:
pmc man page
pmc example