A3 crash with scan_mode Sensitivity

[winf]

However ，scan_mode with stability is working.

[winf]

disable angle_compensate could resolve this

[winf]

maybe “ attribute((packed)) ” in rplidar_cmd.h #line204 cause this behave.
https://stackoverflow.com/questions/8568432/is-gccs-attribute-packed-pragma-pack-unsafe

[ramonvp]

Hi! Any news on this? I am also experiencing the same crash. It does not happen if you modify the launch file and use "Standard" as scan_mode instead of "Sensitivity"

[niralber]

same problem. disable angle_compensate solves the problem. but I don't know why and assume the accuracy is affected by this...

[cjmahieu]

I found that both the Standard and Express mode work. However I would like the Sensitivity mode to work as well..

Disabling angle compensate prevents the crash from happening but makes the scan data unusable as shown below:

(With express / standard option it looks as follows:)

EDIT:

What i reported above was using the package installed via aptitute (i.e. ros-kinetic-rplidar-ros).
Using the version from this git repositoy I was able to run at 'Sensitivity' level if I turned of angle compensation.

Proof below:

[ameykasar]

Had the same problem. Editing the scan mode in launch file (as mentioned above) helped.
The problem went away completely when I switched to another USB cable. Digging more I found out the cable was not capable of providing enough stable power for the sensor.
Observe the laser does not light up when you get the error as the power is not sufficient.

TLDR: CHANGE USB CABLE/ CHECK POWER DELIVERED TO THE SENSOR

[deb0ch]

Looks a lot like Slamtec/rplidar_ros#1 and fixed by Slamtec/rplidar_ros#10 (although I'm not comfortable with the arbitrary number chosen to extend the buffer).

I suspect this repo is deprecated now that the Slamtec one is there so this is FYI