- March 22, 2021 at 5:25 am #16665ryanrsmParticipant
I keep getting a segmentation fault after the first line of accel/gyro data prints to the shell, when trying to run the gyro_accelerometer_tutorial02_inclimometer code. I am using the BerryIMUv2 on a Raspberry Pi Zero with the latest OS (updated/upgraded). Powered w/ a USB battery pack (see attached)
I have tried with HDMI cable connected, displaying the Pi desktop on a monitor, as well as with VNC Viewer. Neither works.
I am also sure my SDL install went well because when I run the sample code to display a black window with a white box, it seems to work. To triple check, I even changed the lines
rect.w = 10;
rect.h = 10;
rect.w = 200;
rect.h = 200;
And rerunning with “./test” (see attached) and sure enough, the white box shows up with 10×10 pixel padding, then a 200×200 white box. This tells me that SDL installed correctly, and the gcc compiler is compiling fine.
But when I compile the gyro_accelerometer_tutorial02.c code with the copy/paste compile line from the “README” file (see attached), and run “sudo ./gyro_accelerometer_tutorial02” it spits out the first line of gyro/accel data, but then gives Segmentation fault.
Maybe worth noting, I do see, for a split second, a window appear on my screen (looks to be totally black) before it dies and I get the seg fault msg.
Lastly, just to be sure, I also included an attachment here to show a screengrab of data spewing out into the command window from running the “tutorial01_angles” code. This demonstrates that my IMU is at least functional. I was moving it around rapidly when the data was logging.
So…what is causing the Segmentation fault? I’m new to SDL. Have never used it before….
Attachments:March 22, 2021 at 9:54 pm #16676jaumeParticipant
I don’t know why segmentation fault comes out, but I have managed to make the inclinometer work like this:
1.- I have put the startSDL () and graphics () functions in a program called sdl.c (like the compas application), like: void startSDL () with int graphics ().
2.- I have adjusted the screen variable in current_w-300 and current_h-140 because the raspberry work with a 4 “screen.
3.- Other personal settings (that do not affect).
4.- It only works if you call the program from a terminal after starting the graphic mode with startx.
JaumeMarch 25, 2021 at 5:19 am #16678jaumeParticipant
Inclinometer with RaspberryPi B+ and Hyperpixel screen
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