1. N

    How to unload a kernel module which is in use and has a recursive module dependency?

    I have a driver for my ELM 327 an it uses the pl2303 module which depends on the usbserial and this again depends on the pl2303 module. What I tried: sudo modprobe -r usbserial pl2303 sudo modprobe -r pl2303 usbserial sudo modprobe -rf usbserial sudo modprobe -rf pl2303 sudo rmmod --force...
  2. R

    How can I interface with an SPI device in embedded Linux?

    I am using individual evaluation board(Grmon GR712). I can compile the Linux kernel and build an image file via build-root. I want to access an SPI NAND flash memory, IS37SML01G1 from userspace in Linux. Assuming that the wire configuration for SPI in the evaluation board is OK, How can I...
  3. D

    Can't connect to an Arduino board

    Hello I have Ubuntu linux and I installed the Arduino IDE on the machine and tried to connect to my board but it couldn't connect. The output at the Arduino IDE was: avrdude: ser_open(): can't open device "/dev/ttyUSB0": Permission denied I also tried adding my user to the dialout group of the...
  4. B

    Accessing serial ports on Intel's Apollo Lake chipset

    Intel's newest E3900 series SoC chips (formerly known as Apollo Lake) come with two built-in UARTs. I've installed Ubuntu 16.04 on a E3950-based SBC and it seems to function normally except for the serial ports. A "dmesg | grep serial" shows that the OS registers two ports (serial0 at ttyS5 and...