Electronics Questions not on EE
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.so file not working in ARM- NExus 5 phone - API 22

I am able to bring my app in my Nexus 5 phone but my audio player (which is a part of .so library) does not play and it gives me null pointer exception. Websites I checked: ...

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Matlab is reading extra characters from arduino serial output

I am having Arduino just output a consistent set of numbers to the COM port. Matlab is reading the COM port and about 1 in 10 times it reads successfully. The other times it adds an extra character or ...

1 answer

VS15 Remote Deploy for ARM not working

I'm trying to deploy Win UWP app to RPi2 with IoT, I did this month ago successfully but since then I get few upgrades from Insider Program on Windows 10 and while I building and deploying project for ...

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Process address space and PTE's User/Kernel bit

Most of modern processors implement paging (for memory management) and in their paging PTEs (Page Table Entry) are very often including user/kernel bit for restrict unwanted access. Why this ...

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External file ressource on embedded system (C language with FAT)

My application/device is running on an ARM Cortex M3 (STM32), without OS but with a FatFs) and needs to access many resources files (audio, image, etc..) The code runs from internal flash (ROM, ...

1 answers | 2 hours ago by Tweepy on Stack Overflow stackoverflow.com
1 answer

SMSC9514 is not detected on Beagleboard xm rev C

I am using linux kernel 3.2.0. The Ethernet works fine in uboot but once the control is transfered to kernel, I see 3 ports found in the boot logs but no log for finding 5 ports hub. The log is at the ...

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Communicating with arduino through wifi. VB.NET

I'm trying to make my arduino recieve easy commands like "@FirstLedOn#". I have a cheap wifi module connected to my router with wifi. Is there a library that helps me with my issue? And if there is , ...

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Arduino LED Matrix algorithm

I need a method that will be able to output the following sequence 1, 1,2, 1,2,3, 1,2,3,4, 1,2,3,4,5 etc up to 9 The purpose of this is to create a sweeping horizontal effect on a 9x9 Led matrix ...

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UBIFS/Nand Filesystem free space dissapearing

I have an embedded Linux device with Nand flash connected to it. I run a UBIFS file-system on top of a UBI partition. I re-flashed the Nand device last week and afterwards, df showed that I was using ...

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Cannot configure wlan0 with static ip?

Debian Wheezy on ARM: wlan0 works with DHCP but doesn't work with static IP. This is my /etc/network/interfaces auto lo wlan0 iface lo inet loopback iface wlan0 inet static wpa-ssid "mySSID" ...

1 answers | 4 hours ago by michelemarcon on Unix & Linux unix.stackexchange.com
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graphic drawing class organisation

I have a basic 4x20 character LCD that I would like to use for displaying a menu with buttons using an Arduino as the driver (limited standard library support). Example LCD menu and buttons I'm ...

1 answers | 4 hours ago by mattb5906 on Stack Overflow stackoverflow.com
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node-serialport does not work with Electron

My task is to build a HTML5 desktop app, which works with serial port, because I have an arduino on the other side on COM-port. I installed electron-prebuilt and serialport packages both (I specified ...

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Changing channels in xbee pro 900

Can the channels can be changed in the following module? https://www.sparkfun.com/products/9099 Resources regarding this are very scarce on the internet. I have gathered that, the changing of ...

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ARM NEON - Understanding vectors

I have to code a bilinear interpolation algorithm in assembly and I have a problem understanding vector instructions in NEON. I'm not quite sure what a vector actually IS in NEON. Is it composed of ...

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When programming microchip in C, how do you calculate the value needed for 1 second delay

If it was given 187.5hz after initial Pragma configuration, it is about 1190 in order to have 1 second delay. I am stuck on how this number is calculated. Please help! This is the initial pragma ...

2 answers | 6 hours ago by swordgit on Stack Overflow stackoverflow.com
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CAN communication between LPC 2292 and LPC1758 boards “Start of Frame ” error

I am trying to setup CAN communication between a couple of LPC device nodes. My setup includes a couple of CAN nodes writing on to the CAN bus. For example LPC 2292 CAN controller can write on to the ...

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Array corrupts its characters C++

I'm writing a small program for the Arduino that is able to read RGB values from a char array of HEX color codes. Let me just give you an example because it is hard to explain differently: From the ...

1 answers | 7 hours ago by orglce on Stack Overflow stackoverflow.com
1 answer

Talk to I2C Devices connected to Arduino from Processing

I want to talk to devices that are connected to an Arduino from the Processing IDE and interface with the I2C communications protocol. The processing language is used to send command and data bytes to ...

1 answers | 8 hours ago by Chrysostomos on Stack Overflow stackoverflow.com
1 answer

Lantronix XPORT - TCP/IP tunnel to send HTTP POST requests

I have a XPORT (TCP/IP serial tunnel device) connected to my microcontroller (PIC18), this way I can send serial messages which are transformed into TCP/IP packages. I've enabled TCP/IP packaging, so ...

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how to send data to arduino from android through Bluetooth when an alarm rings in android phone?

Can anyone please help me on this problem.. I need to send data to arduino from android mobile through Bluetooth when an alarm rings in android phone... i know how to send data normally....but i ...

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Linux Device Driver for GPIO on Beaglebone Black

I have a problem related to Beaglebone Black. It seems that I don't understand something, something is missing. I tried to create a device driver for GPIO but I failed at changing pin's value. Let me ...

2 answers

How does voltage divided by EMF show efficiency?

I get that electromotoric force (emf) is energy per coulomb supplied and that voltage is energy per coulomb used but I don't get what it means when we say that the voltage divided by the emf gives the ...

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PIC16F84_A Interrupt not working

Just started learning PIC microcontrollers. For some reason, PORTB remains 0x00 and interrupt never occurs. ;*** COUNTER WITH INTERRUPT *** ;***** PIC16FA4_A ************* ORG 0H STATUS EQU ...

1 answers | 10 hours ago by jafar on Stack Overflow stackoverflow.com
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Why the delimiters are used in CAN protocol

What is the purpose of delimiters in CAN protocol .. As we know that there are CRC delimiter, ACK delimiter and so on.. Is there any specific purpose for this. Kindly help on this topic.. Thanks in ...

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Arduino IR Sensors Not Calling Functions

With this code written in the Arduino IDE I used to be able to call functions based on which Infrared sensor detected an object(right, left, or both). I altered the code a little bit lately but I've ...

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How do I call functions before setup? Or make a neopixels initializer before setup? [arduino]

I need a hand. I'm trying to figure out how to shuffle some neopixel pins. Right now, I have a function that shuffles the pins, but I don't know how to define those pins and start the strips. I've got ...

1 answers | 13 hours ago by mishap_n on Stack Overflow stackoverflow.com
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HC06 not able to connect to Samsung Note4 Bluetooth even it is paired

I am using Arduino UNO R3 to connect a HC06 bluetooth module referring below article, i am using MAC Book ...

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Parsing serial string data into an array (VVVV to Arduino)

I'm currently working on an arduino project at University. Basically what I am trying to do is send a string of data from VVVV to arduino, however I need to parse the data into an array and I have ...

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gcc undefined reference with reference paths defined in makefile

I am learning GCC and have some undefined reference errors when running make. I am using a makefile which I did not create, however while troubleshooting these undefined reference errors I went ...

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How to read an SMS from Arduino and get LED to switch on or off

#include <SoftwareSerial.h> char inchar; //Will hold the incoming character from the serial port. SoftwareSerial cell(2,3); //Create a 'fake' serial port. Pin 2 is the Rx pin, pin 3 is the Tx ...

3 answers | 16 hours ago by jalpan on Stack Overflow stackoverflow.com
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