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Signal Processing arm
matrix multiplication in ARM assembly
A course of ARM assembly recently started at my university, and or assignment is to create an NxM * MxP matrix multiplication programm, that is called from C code. Now I have a fairly limited ...
How do I interface my Beaglebone Black with a Wi-Pi? Is it possible?
I've recently gotten hold of a Beaglebone Black Rev A5A as well as a RaspberryPi's Wi-Pi USB dongle. Is it possible to interface both devise together or is the Wi-Pi not compatiable with the ...
How to post to Google Docs Form directly
I'm working on a project where i need to post the data i acquire to a Google form and obtain the data from the spreadsheet. I cannot use google apps script and need a method using the direct POST ...
Working with arrays on Arduino in C++
I'm trying to manipulate arrays, but I'm a little confused with I need to do. I want to do something like: char myArray[10]; myArray[0] = 0xA9; myArray[1] = 'D'; myArray[2] = 'S'; myArray[3] = ...
Arduino buttons moving in lock step
I have an Arduino project (it's actually with the Mintduino, but it's the same microcontroller) that has three buttons, setup like the tutorial (http://arduino.cc/en/Tutorial/ButtonStateChange) with a …
ARM assembly: bad instruction 'ldrbcc'
I am writing an ARM assembly code. In it there is a snippet: cmp r3, r2 ldrbcc r6, [r3], #1 I want to express if r3 is less than r2, then load [r3] to register r6. But when I compile it with linaro …
how can i write a spi driver for zynq 7000 a arm develop board?
im going to write a spi driver for arm develop board.it is not used int linux. yestday i read the qspi driver that xilinx provided and i tried it successfully. but i'm intent to write a spi driver. so …
Arduino ADK ways to connect to an Android tablet
Is it possible to connect Arduino ADK and Android through a USB cable in two ways? The first way is through the same connector (USB1) as used at programming, and The second way is through a USB ...
Reversible pseudo-random sequence generator
I would like some sort of method to create a fairly long sequence of random numbers that I can flip through backwards and forwards. Like a machine with "next" and "previous" buttons, that will give …
Node.js source code build giving segmentation fault on ARM
tl;dr: I tried to install node.js on my ARMv7-based Cubox running Ubuntu 12.10 (quantal). When compiling node.js from source (see "Second attempt" below), node produces a segmentation fault. What can …
termios Arduino read/write failing
Hello I am having some trouble trying to program an Arduino to take commands from a c++ program. I am using termios to connect to the Arduino. The Arduino is in gateway mode (basically it is not ...
Msp430g2553 i2c communication library with itg3200 gyroscope
I've been creating an I2C library for communicating with ITG3200 gyroscope for MSP430g2553 experimental launchpad. I still have slight problems with sequential reading and the signed values but I'm …
Minimum volume size for fat12
I am searching for the answer, what is the theoretical minimum size for a FAT12 volume? There is only requirements that embedded and normal systems should recognize it on a pen drive as legal file …
Am I properly identifying the resistor terminal voltage?
The frequency applied to a circuit of voltage 120 V with a real coil and a resistor has a value of 50 Hz. The resistance of the resistor is 10 $\Omega$. The voltage at the resistor terminals ...
How to setup a associative data structure in Arduino
I'm just developing a small remote control which lets me control my IR controlled devices via the Internet. All is working, but I still need to store the codes in a way that I can easily access them. …
Interfacing RN-174-EK with PIC16F877A via TTL UART
I have RN-174-EK evaluation board, and I want to interface it with PIC16F877A through TTL UART. So, what are the required components in order to achieve the interface? and is there any commands to be …
CVAVR bootloader doesn't start
Codevision avr v2.60 evaluation Trying to make new project with wizard. Set all the init values to 0 (not used). BOOTRST bit is set to 0 (reset from 0x7000 byte address). Project option is set to …
compressed and uncompressed kernel on an embedded device
I have been using several different embedded boards that store kernel, init files, filesystem, etc. on partitions of a (micro)SD card. I notice in the example usage or instructions that compressed ...
Very basic XML parsing in C?
I'm looking for a way to read settings out of an XML file. But most likely, the DOM of the whole XML file will not even fit in memory, and I havent got space left for a full-blown library. So I was …
Arm Assembly Instructions: POP what means as return of a function
What does it means LDR.W R8, [SP+0x10+var_10],#4 POP{R4-R7, PC} if I found that instruction at the end of a function? Thanks Paolo
Telnet server enable client linemode
I am writing a little Telnet client on Arduino. How do I reactivate the Telnet client linemode after I deactivate it with the following code? client.write(255); // IAC client.write(251); // WILL …
Electronic filter
Can you explain, please, step-by-step how Electronic filter does work? For example, high pass filter. I know It's a trivial things, but I can't get it completely. Don't bring me formula and etc... ...
Programming bootloader section of flash with avrdude is slow
When programming the bootloader section of flash memory in a ATmega 8-bit processor, specifically the ATmega128, AVRdude is rather slow. All I want to write is the bootloader section of memory, which …
character sent to serial port not read by arduino
I am sending a character from visual studio C# to the serial port and I want arduino to read the character and do some work. But, its not reading it correctly. I have tested the arduino program using …
Mathworks – ARM Target uVision issue
I am attempting to generate c code from simulink that opens in uVision4 and can be flashed onto the stm32f4-discovery board. I know people have done this with the MCBSTM32F200 dev boards, but when ...
Alternative editors/IDEs for Arduino?
I've been playing around with some Arduino projects, but I find the Arduino development software to be kind of lacking in features I'm used to in full IDEs, or even the venerable Notepad++. Are there …
Using USBASP programmer for SPI communication
Currently I'm trying to send some data from PC to ATmega328P chip through USBASP programmer. It is able to transmit up to 4 bytes over SPI. These 4 bytes сan be set in USB Setup Packet (2 bytes for …
Parallel port IRQ Handler registration on IRQ7
I have written one device driver of parallel port driver with IRQ handler. Now, first i must have to access IRQ7 because my parallel port gives interrupt on it(I had seen that on /proc/interrupts). …
Kernel Illegal Instruction when writing to kernel module
I'm making an FPGA System-on-Chip system where I change hardware configuration at runtime with a kernel module. They system uses Linux 2.6 and the LEON3 CPU (SPARC). Some bitfiles work fine but for …
Editing FatFS generic example for dsPIC
I'm attempting to use FatFS (http://elm-chan.org/fsw/ff/00index_e.html) as a means to communicate with an SD card, using SPI. The FatFS website has a number of examples, however I'm not finding them …
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