Electronics Questions not on EE
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1 answer

Arduino-pyFirmata-Python windows error(5,access denied)

Good Morning I want to connect my Arduino board to the pc using pyFirmata lib but a strange problem has occured. Premise: pySerial and pyFirmata are succesfully installed on my computer. I have ...

1 answers | 2 mins ago by FrAxl93 on Stack Overflow stackoverflow.com
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4x4 keypad to 4 inputs in arduino

Bare with me I'm still beginning. So my understanding of a keypad 4x4 is that one row voltage is 5v at one instant and switching really fast and for the arduino to understand which key has been ...

1 answer

glitches when using time overflow interrupt

I have some trouble with, I guess, the overflow interrupt (used to increase resolution on 8-bit timer from 16µs/step to 1µs/step) in my CODE. It seems like the overflow interrupt triggers while the ...

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Arduino + ESP8266 use them booth in AT and Lua mode?

I have an arduino which connected to SPI Flash , IMU and ESP. My algorithm has three stages. Unit starts and record data to SPI flash Computer software connect to ESP8266 and activate a trigger ...

1 answer

indexOf and substring skipping 1 result

I'm trying to separate / explode an String to do something with it later on. The input string is this: 1_2_3_2_2 The function I'm calling with the above value as parameter: void ...

4 answers

Is there a gcc compiler under arm?

I know that if I want to compile a program for an arm device I need a special version of gcc that runs under x86 and compile for arm (cross compiling) is there a way to compile for arm under arm ?

4 answers | 2 hours ago by Lôrd Ralf Adolf on Stack Overflow stackoverflow.com
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How to Inverse FFT in Arduino

/* fft_adc_serial.pde guest openmusiclabs.com 7.7.14 example sketch for testing the fft library. it takes in data on ADC0 (Analog0) and processes them with the fft. the data is sent out over the ...

1 answer

How do I store an integer array in the RFduino flash?

I am trying to do some R&D and need to see how the temperature on the RFduino changes in a 5 minute time interval in a location not connected to a serial console, measured every second. I would ...

1 answers | 3 hours ago by aroushan on Stack Overflow stackoverflow.com
1 answer

Why is MPLAB X not compatible with RTOS

MPLABX has many simulation features, trouble shooting, and bug testing features that I found very useful while I was writing C code in college. Now that im in industry and the systems are more ...

1 answers | 3 hours ago by Gascon26 on Stack Overflow stackoverflow.com
1 answer

sshd not starting after boot on embedded linux built with buildroot?

I've done a minimal install using buildroot's default config for the Raspberry Pi. I also selected openssh and openssl from menuconfig: Package Selection for the target ---> [*] Networking ...

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Java: c2 (server) compiler for Java SE Embedded 8

I created a JRE for our IMX6 (ARMv7) platform using jrecreate tool. The tool is targeting ARMv6. So, as I understand the JRE support ARMv6. Now, I did some research and found out that c2 compiler ...

3 answers

Arduino Uno, multiple processes, multi-threading

I´m facing a problem with an application in Arduino Uno. The board has a sensor that its counting products every second, after some time it sends the number of products to the server however this ...

3 answers | 10 hours ago by jahepi on Stack Overflow stackoverflow.com
1 answer

Arduino escape character \x

I'm using Arduino Pro Mini and OLED display .96" with u8glib library. So I have to use this code to output Ukrainian word "Тест". String str = "\xc2\xd5\xe1\xe2"; u8g.print(str); It works fine. But ...

1 answers | 11 hours ago by skifbrt on Stack Overflow stackoverflow.com
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GDB debugging arguments passed through newlib

I am trying to use newlib on a TI CC2538 ARM Cortex M3 part. The objective is to use printf for debugging messages and I've actually got that working. However the system will segfault after a number ...

1 answer

Jump to Naked function on ARM

The problem is quite simple. My code is : __attribute__ ((naked)) void function(int arg1, int arg2, int arg3) { _asm("push {r0-r6}\n" " .... "); if(checkSomeValue(arg3)) ...

1 answers | 13 hours ago by nemo on Stack Overflow stackoverflow.com
1 answer

Redirecting Ethernet traffic through another interface

I'm working on a project where I want to redirect ethernet traffic through another interface. I have a MBED LPC1768 board which I initialized with a binary that presents the device as USBCDC-ECM ...

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I2C Module Not Responding

I am writing a basic I2C slave as part of my code on a 20-pin 8-bit PIC16f MCU. As best as I can tell, this microcontroller has a module that watches the I2C bus and only updates my registers if there ...

1 answer

Why is the electric field highest in regions of highest resistance?

I know Kirchhoff's law and that current must be constant. But what exactly is the phenomenon, from first principles, that causes the electric field to be stronger in a region with lower carrier ...

8 answers

Mono on Raspberry Pi

I've seen a lot of talk about running Mono/.NET code on the Raspberry Pi. Has there been any succceses in actually running any Mono code on the Raspberri Pi? On their site, they list several Linux ...

2 answers

Arduino communication in wireless IR system

I have two Arduinos that I want to put in a wireless system to relay an IR code from a hand held remote in one room of the house, to a settop box located in another room. One Arduino has an IR ...

2 answers | 18 hours ago by user1414003 on Stack Overflow stackoverflow.com
1 answer

Measured voltage on coil

I have a simple circuit of coil with inductance L $$u_c(t)= -L\frac{di}{dt}$$ and AC source with output voltage $u_s$ What is actually measured by the voltmeter ($u_c$, $u_s$ or $u_s - u_c$)? If ...

2 answers

Emulating UART over USB

Does anybody know if it's possible to emulate UART (simple serial transmit and receive) over USB? How would this be accomplished? I found this link on the Microchip website, but it's not very ...

2 answers | 21 hours ago by Jim Fell on Stack Overflow stackoverflow.com
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Cortex-M3 Linking _sidata located incorrectly

I'm in the process of changing compiler from the Codesourcery Codebench Lite for ARM EABI gcc (v4.7.2) to the arm GCC 2014 q1 (v4.8.3) and am having an issue with the location of certain memory ...

1 answer

Verifying Arduino Due with arm-none-eabi-g++

I'm interested as to what command/s are exactly run behind the scenes when I run arduino -verify /path/to/file.ino I'm asking this because I'm working with an Arduino Due board and although I can ...

1 answers | 22 hours ago by zapatilla on Stack Overflow stackoverflow.com
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Measurement of TLB effects on a Cortex-A9

after reading the following paper https://people.freebsd.org/~lstewart/articles/cpumemory.pdf ("What every programmer should know about memory") I wanted to try one of the author's test, that is, ...

2 answers

Using another's device resources for software execution

I have an old weak laptop (core duo at 1.7Ghz) and a quad core phone(arm cortex a7). Both are running linux. Could I use phone's resources from laptop to execute(process) stuff for laptop? Is there ...

2 answers | 23 hours ago by Housemd on Unix & Linux unix.stackexchange.com
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Difference betwen TSO/RMO/PSO and Power/ARM

This question is about memory consistency. There is an example below that might help if it's unclear. A problem I am looking at asks for code that can do something when executed on Power/ARM that it ...

1 answer

bone_capemgr missing in Linux 3.16.0-bone2 BeagleBoneBlack?

I just installed linux 3.16.0-bone2 on my BBB from https://rcn-ee.net/deb/trusty-armhf/v3.16.0-bone2 Im used to work with dtbos and /sys/devices/bone_capemgr*/slots in Linux 3.8.x So I was surprised ...

2 answers

Clarify: Processor operates at 800 Mhz and 200Mhz DDR RAM

I have an evaluation kit which has an implementation of ARM Cortex-A8 core. The processor data sheet states that it has a ARM Cortex A8™ core, which operates at speeds as high as 800MHz and Up to ...

1 answer

How to convert unsigned char to signed integer by neon

How to convert a variable of data type uint8_t to int32_t by using neon intrinsic . I did not find any intrinsic for doing this .

1 answers | yesterday by user3476225 on Stack Overflow stackoverflow.com
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