beagleboneblack

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

I have searched & googled a lot but I cannot get this to work. I want the Beaglebone to boot up into my Qt application. However, what I get is that the GUI boots up OK but then in a few seconds the Angstrom login screen overwrites my GUI, which stays running in the background. I set up a systemd service as follows in /etc/systemd/system: #!/bin/sh [Unit] Description=Meta Systemd script [Service] USER=root WorkingDirectory=/home/root ExecStart=/bin/sh -c 'source /etc/profile ; /home/root/meta6 -qws' After=local-fs.target Type=oneshot RemainAfterExit=yes [Install] WantedBy=multi-user.target I

My native machine is ubuntu based 14.04 LTS x86_64 system, I want to cross-compile applications and QT programs for Beaglebone black, which is an armv7 based system running on Debian 2015 distribution. Which toolchain I should install on my native system, to get this done? Here is a very usefull link how to set up the crosscompiler, uboot, kernel and the filesystem for a beaglebone black. If you only want to crosscompiler, then just follow the few code lines in the Crosscompiler chapter https://eewiki.net/display/linuxonarm/BeagleBone+Black To cross-compile applications you need to use the '

Already tried: Connect the BBB with USB to iMac Share internet with the board from System Preferences->Sharing ssh to the board and then try to udhcp -i usb0 This is what it says: udhcpc (v1.20.2) started Gets stuck and I get and error: Write failed: Broken pipe ssh exits Any clues? Your SSH session is getting stuck because you're connected to usb0 and the udhcpc command changed the IP address for it! At this point there's nothing listening on the other end of your ssh session, so your local computer's ssh client eventually fails with the broken pipe error and exits. An obvious workaround is

I'm currently stuck on a problem with GPIO pins with the Beaglebone black. I am looking for a proper way to read the values from GPIO pin p8_4 in C. I tried to use a library which used an old not supported way from the time before device tree's where introduced, if I understand this correctly. I tried to find other solutions to my problem but I can't seem to find one. Is there anyone who can get me on the right track in C? Here is a C code: #include <stdio.h> int main() { FILE *io,*iodir,*ioval; io = fopen("/sys/class/gpio/export", "w"); fseek(io,0,SEEK_SET); fprintf(io,"%d",39); fflush(io);

I'm looking for a way to turn power off (and back on) for a USB port. Solution can be in C, bash, etc. I'm using a BeagleBone running 32-bit Ubuntu 16.04 for armhf. > uname -srvm Linux 4.4.6-ti-r15 #1 SMP Tue Apr 5 12:32:22 UTC 2016 armv7l I've tried many things discussed on StackOverflow and AskUbuntu, including: #include <linux/usbdevice_fs.h> int main(void) { int fd = open( "/dev/bus/usb/001/002", O_WRONLY ); if (fd < 0) return 1; int rc = ioctl( fd, USBDEVFS_RESET, 0 ); if (rc < 0) return 2; close( fd ); return 0; } The USB device I need to turn off (and eventually back on) is a Champtek