Commands you may find useful

use screen

Check console output: $ screen -r kerrigan (or caApp, purplrBox)
Close current console: $ ctrl + A + D
Shut down program: $ pkill screen

Check GPU usage

$ sudo ~/tegrastats --interval <int> --logfile <out_file> &
For example:
$ sudo ~/tegrastats --interval 5000 --logfile ~/ddrone #This command probes every 5 seconds

The out put is similar to this:

RAM 2135/7855MB (lfb 1057x4MB) CPU [2%@2035,0%@2035,0%@2035,2%@2035,2%@2036,2%@2035] EMC_FREQ 1%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% BCPU@30C MCPU@30C GPU@29C PLL@30C Tboard@28C Tdiode@28.25C PMIC@100C thermal@29.4C VDD_IN 3104/4029 VDD_CPU 291/730 VDD_GPU 145/207 VDD_SOC 727/746 VDD_WIFI 0/180 VDD_DDR 1248/1375

Please check tegrastats utility reports to get more info about the stats.

The data we normally care about are:

• RAM X/Y: X is the amount of RAM in use in MB.
• CPU [X%@Z, Y%@Z,…]: Load statistics for each of the CPU cores relative to the current running frequency Z.
• GR3D_FREQ X%@Y: Percent of the GR3D that is being used, relative to the current running frequency. GR3D is the GPU engine.

Hotspot setup

• Enable broadcast of SSID (self wifi mode)

$ echo 2 > /sys/module/bcmdhd/parameters/op_mode

• Change back to normal wifi mode

$ echo 0 > /sys/module/bcmdhd/parameters/op_mode

• To make it persistent Add line options bcmdhd op_mode=2 in nano /etc/modprobe.d/bcmdhd.conf

• Change ip address Add line address1=192.168.1.150/24

TX2 Fan

• stop fan

$ sudo -s 
$ cd /sys/kernel/debug/tegra_fan/
$ echo 0 > target_pwm

• Check temperature

$ watch -n 1 cat /sys/class/thermal/thermal_zone?/temp 

Submodule

• Add a new submodule with a branch name

$ git submodule add -b branch_name  https://bitbucket.org/nusuav/repo_name.git

• Remove a submodule

$ git submodule deinit -f submodule_name (The name of the submodule is the same as the repo's name)   
$ rm -rf .git/modules/submodule_name
$ git rm -f submodule_name

To be continued