beagleboard

I'm starting to write a toy OS for the BeagleBone Black , which uses an ARM Cortex-A8-based TI Sitara AM3359 SoC and the U-Boot bootloader. I've got a simple standalone hello world app writing to UART0 that I can load through U-Boot so far, and now I'm trying to move on to interrupt handlers, but I can't get SWI to do anything but hang the device. According to the AM335x TRM (starting on page 4099, if you're interested), the interrupt vector table is mapped in ROM at 0x20000. The ROM SWI handler branches to RAM at 0x4030ce08, which branches to the address stored at 0x4030ce28. (Initially, this

How do I start an application automatically after login? I have tried the following: Editing /etc/inittab but I don't have an /etc/inittab file, it looks like my system uses systemd. Starting my application by adding it to the script /etc/rc.local . Adding a script in /etc/init.d and a symlink to the script in /etc/rc5.d/S51script_name . Calling my script from ~/.bashrc and ~/.bash_profile . Adding a service to systemd but I couldn't get it to work and it seems more complicated than it should be for my purposes. I am running Angstrom v2012.01-core - Kernel 3.0.17+ on BeagleBoard xM. Found the

I'm working with a BeagleBone Black and using Adafruit's IO Python library. Wrote a simple quadrature decoding function and it works perfectly fine when the motor runs at about 1800 RPM. But when the motor runs at higher speeds, the code starts missing some of the interrupts and the encoder counts start to accumulate errors. Do you guys have any suggestions as to how I can make the code more efficient or if there are functions which can cycle the interrupts at a higher frequency. Thanks, Kel Here's the code: # Define encoder count function def encodercount(term): global counts global Encoder_A