An embedded system is a computer system designed to perform one or a few dedicated functions often with real-time computing constraints. It is embedded as part of a complete device often including hardware and mechanical parts.

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How to intitalize data in Program Memory

Im using MPLAB IDE & C18 compiler to program Pic18f2550. I have to initialize a const string in program memory to save space in RAM how do I do it ?
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79 views

I want to send data to seven segment display without micro-controller

I'm new to embedded systems I want to send data to seven segment display from my pc could i connect the seven segment display to my pc via serial or usb port or i have to use a micro-controller ...
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2answers
130 views

Correct ways for implementing standard inbuilt watch dog timers

I'm bit new with using applications that use watch dog timers and i'm up to use one for the first time. I'm using pic18f26j50 and it got an internal watch dog timer which got a limit from 2ms and can ...
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3answers
72 views

How to do a specific task after some time

I have to switch on one relay after some specific time, but at same time I have to do continuous polling for controlling other relays, I am already using interrupt for multiplexing purpose (7 segment ...
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1answer
29 views

How to Prevent continuous switching fluctuation?

I am designing a digital stabilizer ,I am using ADC feature of Micro controller to sense incoming voltage and processing output through an AUTO Transformer .The code is like ...
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1answer
67 views

Displaying different Data on 7 segment

I am Designing a Digital Stabilizer ,where I have to Use a Multiplexed 7 segment Display to Show Input Voltage & Output Voltage ,I have successfully able to see input voltage but I am unable to ...
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1answer
55 views

How much humidity can a microcontroller/embedded device withstand?

I'm working on a project that employs a microcontroller in an 80-85°F environment with quite a bit of humidity. It's going to be placed directly next to an array of fish tanks. Obviously, the water ...
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2answers
119 views

how to build a micro processor? [closed]

I have learnt about 8085 micro processor in my 4th sem of engineering. Now I want to make own 8085 micro processor . My question is how should I start ? What are the requirements and which are the ...
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4answers
66 views

Image processing hardware options

My imaging system currently produces a stream of digitized video data at 10Msps. That is, parallel 12bit ADC output at 10MHz. The next step is to collect the data in 1024*1024 chunks and perform image ...
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2answers
259 views

Interfacing with SATA in embedded systems

Would it be possible to use a SATA interface in an embedded system, for example a MP3 player or a video camera? (speed not critical) What is the typical way to do this? On chip peripherals, external ...
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14 views

uC MPC5646CRM Interrupt source address

I am using an Embedded development software that needs the address of ISR in order to perform Interrupt. I am using MPC5646CRM Micro-Controller. The datasheet tells about the calculation of address. ...
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14 views

Audio streaming issue with CSR-8670 kit

We are using Source App in "Analogue mode" in which we reached to a point where our kit is able to paired with the mobile device but when we start to play audio in mobile through paired CSR audio ...
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1answer
58 views

Ethernet chip with integrated tcp/ip stack [closed]

I would like to ask what Ethernet chips are popular for an embedded webserver project. Features needed ... integrated tcp/ip stack support ntp protocol php support Basically the main purpose of ...
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1answer
33 views

SPI Slave Frequency Setup

This question is in regards to a configuration where I want to setup a half-duplex SPI bus, with a master outputting a clock at 1MHz. Does the slave need to know that the clock coming in will be ...
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2answers
295 views

Is a computer mouse considered an embedded system? [closed]

Can a computer mouse (optical) be considered an embedded device? Does it adhere to the definition of an embedded system? Is there any good reference for how a computer mouse is made?
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1answer
65 views

TCP bootloader memory issue

I am trying to write a simple, stand-alone TCP bootloader for an AVR micro-controller. Right now, I have got a collection of APN that weigh almost 14KB memory. The application code will establish a ...
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0answers
35 views

OLinuXino iMX233 won't boot

After I get my OLinuXino I would like to try first boot up a sample system and look around, but looks like it's more difficult as I first think! I found a tutorial in the webshop and I prepared the ...
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1answer
60 views

STM32 not booting without J-link

I've got a device with STM32F439 microcontroller on it. I flashed the firmware using the J-Flash utitilty (flashed and read back data is same). Then started the application from J-flash: everyting ...
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45 views

Embedded host driver or RS232 host-side converter for CP210x USB device?

I currently have a device that uses a CP2102 UART-to-USB converter to send information to a PC. Now I want to instead have it send information into a dongle (not part of the actual device), which will ...
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3answers
488 views

Is it normal to have SPI Clock with varying duty cycle?

I am working to get an SPI interfacing radio module on embedded Linux system. This particular module (RFM12B) is already ported onto Raspberry Pi. Now I am working on OMAP4 based systems. I noticed ...
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1answer
126 views

How many cycles does an ARM Cortex M0 use to multiply floats?

Actually I have three smaller questions: On an ARM cortex m0: How many cycles does it take to perform multiplication of single precision floats and store them into a float? i.e. x = a*b; Where x, ...
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48 views

Simulate STM32F4 brownout reset using STM32F100

The STM32F4 MCU has a brownout reset feature. According to the manual, section 5.2.2, when the supply voltage VDD drops below the selected VBOR threshould, a device reset is generated. After reset, I ...
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2answers
45 views

How does multimaster I2C work and its significance?

I am fine with I2C basic communication and implementation? Need info on Multimaster mode of I2C How does multi master I2C work? Advantages over I2C single Master? In what circumstances this multi ...
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2answers
263 views

Tiny Code for dumping Flash Memory

I'm trying to write as tiny code as possible to extract the firmware of Infineon's XMC4500 microcontroller. The code must fit into a 30 byte buffer which allows me to have 15 machine instructions ...
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2answers
118 views

Reason for choosing SPI based flash devices over I2C ones [duplicate]

I have gone through the below link which says that u-boot support three type of flash technology http://www.stlinux.com/u-boot/flash 1.Nand 2.NOR 3.SPI Serial Flash I would want to know why SPI is ...
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1answer
38 views

How do NAND flash memory writes work?

Below is a picture of my understanding of NAND flash memory operation. NAND flash works by first erasing all the cells in a single block (essentially setting it to '1') and then selectively writing ...
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3answers
93 views

Dump Flash Memory through a single GPIO pin

I'm working with Infineon's XMC4500 Relax Kit and I'm trying to extract the firmware through a single GPIO pin. My very naive idea is to dump one bit at a time through the GPIO pin and somehow ...
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91 views

Periodic timer (64Hz) with ARM processor and (embedded) Linux

I want to call a function 64 times per second with a ARM processor which is running linux. (ex: Rasberry Pi or Freescale i.mx6). Ideally, I don't want too much jitter. I want to perform a task ...
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1answer
113 views

Going from Breadboard to PERMANENT circuit but have Arduino shields attached?

I have made an Arduino project that uses a shield. I am now trying to turn it into a permanent circuit. I have flashed the microcontroller with the program, and I have all the parts I need to solder ...
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1answer
82 views

Trying to figure out how to solar power an embedded device

I have an Arndale octa board which itself needs 5V 3A power supply. Then I have four (4x) DC 5V motors and a 5V servo, and a number of other peripheals. So I think 5V 5A is safe to assume? I want ...
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120 views

Question regarding PCB design layout of Raspberry Pi

I have query regarding PCB design layout of Raspberry Pi (RPI). I wanted to know how LAN9512 chip is connected to Ethernet RJ45. I found one of PCB layout picture which suggests there is line on PCB ...
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57 views

NAND: no devices available

I am trying to run FALCON MODE on zynq-microzed board. I am following README-falcon.But when i run nand read 82000000 kernel command, i get this error.. **no ...
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51 views

FPGA able to send data, but unable to receive data. (UART - RS232)

I have a DE0-nano FPGA board and I am trying to establish a serial connection with my PC. I am using the RS232 implementation from here: http://www.fpga4fun.com/SerialInterface.html I have tested ...
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1answer
20 views

ADuC812 needs DAC value written twice. Is that normal/common?

A while ago I had a project that involved Analog Devices ADuC812 microconverter. Amongst assorted on-board hardware, the device had two very helpful DAC converters, that could source 0-5V on their ...
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1answer
27 views

How can I achieve a third interrupt priority level on 8052?

Most standard 8052 platforms allow the user to configure interrupts to be of two possible priorities: higher, during which any pending interrupt must wait, and lower, which can be interrupted by the ...
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2answers
45 views

Is there a way to prevent code being read from an MSP430 without blowing the fuse?

I was recently involved at a project in a small company where we had fears of someone taking the code from the master chip, an MSP430F2419, and using it for a competing product. We ended up blowing ...
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50 views

Devices which consume substantial power in modern embedded real-time systems? [closed]

Could anybody cite examples (if any) of devices and peripherals in modern embedded and real-time systems which consume substantial amount of power compared to modern processors. As processors get more ...
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1answer
100 views

What is Platform Bus in Embedded Systems?

I would want to know what is the Platform bus in SoC . I have seen some device driver implementation in Linux kernel where drivers are registered with platform bus or rather should i say these all ...
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2answers
167 views

RGB LED flickering with PWM

I just have issues with the RGB LED flickering under low duty-cycle like 10% on time with 780 Hz. I tried changing the PWM frequency to lower and higher rate but I still see flickering at low ...
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4answers
397 views

USB as a local bus in an embedded system

Is USB a reasonable choice for a local bus? what are pros and cons? what reliability concerns are there? Bus spec device count ~4; peripheral devices are permanently connected to same PCB as host ...
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75 views

GPIO in device tree

My board has 3 GPIOs, namely gpio0, gpio1 and gpio2. Each of them have 32 pins. They were ...
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1answer
159 views

Using interrupts to strobe an LED

Beginner here, just playing around with a devboard using a PIC micro. I am attempting to strobe an LED using an interrupt, I've created the function below within isr.c, INTOSC is running at 4MHz, TMR0 ...
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77 views

ALU using full adder and MUX [closed]

I am trying to implement a 1 bit ALU on Tanner EDA. I have a separate full adder and 2:1,4:1 MUX circuits. My question is: How do I interconnect the full adder to the MUXes, so that it work as an ALU? ...
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69 views

Where is the pixel data in xilinx AXI_video DMA IP ? to apply a sobel filter on that data

I want to read/write some data in streaming mode from/to memory using AXI video DMA. It has two signals M_MM2S and S_S2MM (memory to axi stream and axi stream to memory) which probably contains the ...
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0answers
38 views

LMP90098: wrong converted value after changing gain, despite restarting conversion

I'm using a Texas Instruments LMP90098 (datasheet here), which is an A/D converter with a programmable gain amplifier, multiplexer, current source and a few other features. I need to use two ...
2
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1answer
122 views

CAN connection help needed

I bought the IAR Kickstarter kit to work with the SM470R1B1M-HT (Texas Instruments) microcontroller. I would like to implement CAN communication between the microcontroller and a PC. I need to send ...
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1answer
119 views

Why Linux doesn't get booted automatically only If I changed the BOOT.bin not the zImage, while in the first case it gets automatically booted

I have zynq board ( not the zedboard), it doesn't have all the peripherals of zedboard. I am facing some problem while booting the linux on zynq with my new BOOT.bin. When I used to put the sdcard in ...
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1answer
116 views

The difference between storage patterns in RAM or SD cards from EEPROM [closed]

I have used EEPROM to store data in embedded systems. I would like to know about the pattern of RAM and SD cards which were used to store data. Is it that complex in terms of using RAM or SD cards? I ...
2
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1answer
69 views

Firmware reliability for over temperature detection

I am speaking about an industrial equipment that is generating gas. It is under certification test (CE marking) IEC 61010 in a third party lab. In the device there is an over temperature detection ...
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1answer
121 views

Netduino Interrupts Affected By PWM - Diagnosis of Issue

I've got a funny problem with interrupts and PWM signals that's causing false interrupts to trigger. What exactly is happening is that I'm using a hardware debounced quadrature rotary encoder. The ...