enable_pps_support_raspian

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enable_pps_support_raspian [2019/11/03 09:36] – nikolalenable_pps_support_raspian [2022/09/19 11:34] (current) – external edit 127.0.0.1
Line 3: Line 3:
   * CONFIG_PPS ("PPS support" in "make menuconfig")    * CONFIG_PPS ("PPS support" in "make menuconfig") 
   * CONFIG_NTP_PPS ("PPS kernel consumer support" in "make menuconfig")    * CONFIG_NTP_PPS ("PPS kernel consumer support" in "make menuconfig") 
 +==== Install dependencies ====
 +''%%sudo apt install git bc bison flex libssl-dev%%''
 ==== Download kernel ==== ==== Download kernel ====
   mkdir ppskernel   mkdir ppskernel
Line 19: Line 21:
   * Go to ''%%General setup ---> Timers subsystem --->%%'' and disable ''%%Old Idle dynticks config%%'', then enter ''%%Timer tick handling%%'' and change it to ''%%Periodic timer ticks (constant rate, no dynticks)%%''   * Go to ''%%General setup ---> Timers subsystem --->%%'' and disable ''%%Old Idle dynticks config%%'', then enter ''%%Timer tick handling%%'' and change it to ''%%Periodic timer ticks (constant rate, no dynticks)%%''
   * Turn on PPS support: ''%%PPS kernel consumer support %%'' is the option that should have become visible after changing the timer settings. If not, save and reload ''%%make menuconfig%%''.   * Turn on PPS support: ''%%PPS kernel consumer support %%'' is the option that should have become visible after changing the timer settings. If not, save and reload ''%%make menuconfig%%''.
-    Device Drivers ---> PPS support --->+  * Enter Device Drivers ---> PPS support ---> 
 +\\
             <M> PPS support               <M> PPS support  
             [ ]    PPS debugging messages             [ ]    PPS debugging messages
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             <M>    PPS client using GPIO             <M>    PPS client using GPIO
                    *** PPS generators support ***                     *** PPS generators support *** 
-Save and exit. To verify, check the ''%%.config%%'' file that has been created in the same folder (nano .config). These options should be present somewhere in the file:+\\ 
 +  * Save and exit. To verify, check the ''%%.config%%'' file that has been created in the same folder (nano .config). These options should be present somewhere in the file: 
 +\\
   CONFIG_PPS=y   CONFIG_PPS=y
   CONFIG_NTP_PPS=y   CONFIG_NTP_PPS=y
Line 43: Line 48:
   CONFIG_PREEMPT_VOLUNTARY=y   CONFIG_PREEMPT_VOLUNTARY=y
   # CONFIG_PREEMPT is not set   # CONFIG_PREEMPT is not set
 +==== Compile the kernel ====
 +  make -j4
 +  make modules
 +\\
 +  * Gain superuser privileges and transfer a copy of the new kernel to the boot partition:
 +\\
 +  sudo -i
 +  cd ~pi/ppskernel/linux-rpi-[kernel version number].y
 +  make modules_install
 +  cp ./arch/arm/boot/zImage /boot/kernel_new.img
 +\\
 +  * Tell the system to use this new kernel by adding ''%%kernel=kernel_new.img%%'' to ''%%/boot/config.txt %%''.
 +  * Reboot
 +==== Add PPS source and load kernel module ====
 +  * Open ''%%/boot/config.txt %%'' again, and ''%%dtoverlay=pps-gpio,gpiopin=[GPIOPIN]%%'' where GPIOPIN is the PPS signal.
 +  * Load kernel module: ''%%sudo modprobe pps-gpio%%''
 +==== Test  and make permanent====
 +  * Test
 +\\
 +  apt-get install pps-tools
 +  sudo ppstest /dev/pps0
 +\\
 +  * Expected result is something like:
 +\\
 +  trying PPS source "/dev/pps0"
 +  found PPS source "/dev/pps0"
 +  ok, found 1 source(s), now start fetching data...
 +  source 0 - assert 1572772437.999997402, sequence: 6168 - clear  0.000000000, sequence: 0
 +  source 0 - assert 1572772438.999997803, sequence: 6169 - clear  0.000000000, sequence: 0
 +  source 0 - assert 1572772440.000000924, sequence: 6170 - clear  0.000000000, sequence: 0
 +  source 0 - assert 1572772440.999998834, sequence: 6171 - clear  0.000000000, sequence: 0
 +  source 0 - assert 1572772442.000001424, sequence: 6172 - clear  0.000000000, sequence: 0
 +  source 0 - assert 1572772442.999999478, sequence: 6173 - clear  0.000000000, sequence: 0
 +  source 0 - assert 1572772444.000000128, sequence: 6174 - clear  0.000000000, sequence: 0
 +  source 0 - assert 1572772444.999999537, sequence: 6175 - clear  0.000000000, sequence: 0
 +  source 0 - assert 1572772446.000000578, sequence: 6176 - clear  0.000000000, sequence: 0
  
 +
 +\\
 +  * If successful, make permanent by opening ''%%/etc/modules%%'' and adding ''%%pps-gpio%%'' to the end.
 +  * Running a DUNE configuration with ''%%Supervisors.ClockPPS%%'' should now work
  
 ===== Links ===== ===== Links =====
   * [[https://support.ntp.org/bin/view/Sandbox/HowtoPpsOnRaspberryPi|How to PPS on Raspberry Pi]]   * [[https://support.ntp.org/bin/view/Sandbox/HowtoPpsOnRaspberryPi|How to PPS on Raspberry Pi]]
 +  * [[https://ava.upuaut.net/?p=951|5 minute guide to making a GPS Locked Stratum 1 NTP Server with a Raspberry Pi]]
 +  * [[http://brandon.penglase.net/index.php?title=NavSpark_GPS%2BGLONASS_Stratum-1_NTP_Time_Source_with_a_Raspberry_Pi#Configure_the_kernel|NavSpark GPS+GLONASS Stratum-1 NTP Time Source with a Raspberry Pi]]
 +  * [[https://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html|The Raspberry Pi as a Stratum-1 NTP Server]]
  • enable_pps_support_raspian.1572770171.txt.gz
  • Last modified: 2022/09/19 11:33
  • (external edit)