How to get 1PPS out on Lx2160

[shinhakang]

I am working on Lx2160 board to get IEEE 1588 1PPS.(on PULSE_OUT1 or PULSE_OUT2)

The flex-builer version that I used is 20.04.

It seems the kernel supports 1588 feature and I use linuxptp to test it.

However I couldn't find any document or instructions to enable 1PPS signal.

Please help. Thanks!

[yipingwang]

Please refer to "• Verify PPS signal " in LSDKUG_Rev20.04.pdf.

For generating 10 MHz and 1 PPS on the 1588, fiper registers have to be programmed accordingly. 1588_pulse_out1 and 1588_pulse_out2 pins is used for outputting 10MHz and 1pps. 

[DohwanAhn]

We are using the LX2160ardb (rev2) reference board.

We change to CFG_MUX_EC2 = b'1, IEEECLK=b'0 in BRDCFG4 (0x54h) register of CPLD.

we have set up as below:

root@localhost:~# i2c-tools/i2cget -y 0 0x66 0x54
0x20
root@localhost:~# i2c-tools/i2cset -y 0 0x66 0x54 0xA0
root@localhost:~# i2c-tools/i2cget -y 0 0x66 0x54
0xa0

And, we modified the RCW file as follows : 

diff rcw_2000_700_2900_19_5_2.rcw.origin rcw_2000_700_2900_19_5_2.rcw
29a30
> EC2_PMUX=2

flex-builder -c atf -m lx2160ardb_rev2 -b xspi

flex-builder -i mkfw -m lx2160ardb_rev2 -b xspi

And, we executed the following command in the kernel  : 

echo 1 > /sys/class/ptp/ptp0/pps_enable
cat /sys/class/pps/pps0/assert

root@localhost:~# cat /sys/class/pps/pps0/assert
1651636872.926440409#20
root@localhost:~# cat /sys/class/pps/pps0/assert
1651636874.926441180#22

But, We can't see pulse out

Q1 : Is there anything more we need to do?
        If you have a working patch code, please send it to us.

Q2 : Does detailed documentation exist?

[yipingwang]

In RCW configuration, you should configure EC2_PMUX=1.

EC2_PMUX  Configuration Configures the functionality of the EC2 pins
0b00 - WRIOP MAC 18 RGMII
0b01 - IEEE1588 and GPIO4 for the remaining
0b10 - GPIO4
0b11 - Reserved

[DohwanAhn]

[Note] We referred page 179 of the LX2160ARM.pdf  (Rev. 1, 10/2021)

If a new LX2160ARM.pdf file exists, please let us know.

Thanks,

[DohwanAhn]

We did as you suggested. but, the result is the same.

Please let us know if there are any other points.

Thanks,

[shinhakang]

Thanks,

I had tried on Lx2160_ARDB Rev2 reference board. but cannot get any signal.

after configured "echo 1 > /sys/class/ptp/ptp1/pps_enable" /sys/class/pps/pps0/assert was increased.

But not shown any signal on 1588_PULSE_OUT1 and 1588_PULSE_OUT2.

is there any preparation ?

Thanks.