Stack Exchange
log in sign up chat discuss faq users badges

Area 51 » Technology

definition commitment beta

The Embedded Systems site didn't have enough activity during the beta and has been closed. You can download the data dump of all questions here.

54 Example Questions

active newest votes
up vote 12 down vote
When should I consider working with RTOS?
added by Mellowcandle, edited by WikiSpeedia hang-around Jul 8 '13 at 21:36
link
up vote 11 down vote
I need a precisely timed 5 ms pulse on a GPIO pin of [SBC] running embedded Linux. How do I do it?
added by SF., edited by WikiSpeedia hang-around Jul 8 '13 at 21:29
link
2  
A kernel module or kernel edit? A modification of the FPGA code? Attach a custom piece of hardware? – SF. Jan 26 '13 at 23:38
up vote 11 down vote
I upgraded U-Boot and my MAC address seems to have changed. Why?
added by Gilles Jan 28 '13 at 1:13
link
up vote 11 down vote
How can I optimize my C program to run faster on an embedded host?
added by Adam Lawrence Feb 10 '13 at 21:10
link
2  
I think this should be generalized to 'How can I optimize a C program to run faster on an embedded host?' Or else the site would become subject to tons of code reviews and there is already a SE site for code review :-) – BigHomie Apr 18 '13 at 15:13
This is AVR related but you can generalize to other systems... atmel.com/Images/doc8453.pdf – Jamiro14 May 3 '13 at 14:45
@MDMoore313 Agreed. – Adam Lawrence May 3 '13 at 15:33
I believe "How can I optimize [a section of code performing a common task] for [specific embedded platform] " would provide a never-ending stream of questions answers to which would be useful for generations to come. If you want to optimize complete firmware for printer cartridge it's a different thing than trying to optimize reading optical encoder for measuring servo rotation with 8051. – SF. Aug 21 '13 at 14:41
up vote 11 down vote
What techniques are there to multiplex background processing (like ADC reads) and lower-priority activities (like I²C) without a full-blown RTOS?
added by Adam Lawrence, edited by WikiSpeedia hang-around Jul 8 '13 at 21:30
link
All these are interesting questions but, would not it be more useful, vote the questions with a lower score of 10? – RTOSkit Aug 17 '13 at 15:39
up vote 11 down vote
Why is this timer interrupt routine for {processor} not getting called?
added by BenjiWiebe Feb 15 '13 at 2:23
link
up vote 11 down vote
What is bitbanging and what is it used for?
added by Mellowcandle, edited by WikiSpeedia hang-around Jul 8 '13 at 21:33
link
up vote 10 down vote
How can I implement the fastest bitwise XOR in an 8051 clone?
added by SF. Jan 26 '13 at 23:29
link
up vote 10 down vote
Can I implement a bit of custom FPGA code in a TS-7200 platform without breaking its on-FPGA RS-232?
added by SF., edited by WikiSpeedia hang-around Jul 8 '13 at 21:28
link
up vote 10 down vote
Getting 24-bit CAN headers to work with a Cirrus EP9302 ARM9 and Lincan.ko
added by SF. Jan 26 '13 at 23:40
link
2  
Votes over 10 for a particular question don't help to create the community. Rather than vote again for a popular question, it's best to look at some of the questions with fewer than 10 votes and upvote them. Don't forget that you can also move your votes by clicking the up arrow on a question you've already voted for to remove your vote, then voting again on another question. - Quoting Renan – Mellowcandle Apr 28 '13 at 12:51
1  
Not true, see here – BigHomie Jun 5 '13 at 15:00
up vote 10 down vote
How can I implement a fast [floating point operation] on a [MSP430] microcontroller?
added by Renan Jan 27 '13 at 1:06
link
Not true, see here – BigHomie Jun 5 '13 at 15:00
up vote 10 down vote
How can I determine the worst-case delay to wake up my Cortex-R5 core?
added by Gilles Jan 28 '13 at 1:08
link
up vote 10 down vote
Is it possible to make an AVR use external SRAM as though it were internal (access it with pointers)?
added by BenjiWiebe Jan 31 '13 at 14:04
link
up vote 10 down vote
Do any PICs or dsPICs support I2C Ultrafast mode as host?
added by Scott Seidman Feb 1 '13 at 4:14
link
up vote 10 down vote
When I use a microcontroller with native support for a four-bit SD bus, my embedded board must pay a royalty to SDA?
added by RTOSkit, edited by WikiSpeedia hang-around Jul 8 '13 at 21:31
link
up vote 10 down vote
Why is my embedded industrial product with a "x86 SX" chipset obsolete? When with it, I do all functions that can be done with a more modern chipset.
added by RTOSkit, edited by WikiSpeedia hang-around Jul 8 '13 at 21:32
link
up vote 10 down vote
How can I detect and recover from an I²C bus hang?
added by Adam Lawrence, edited by WikiSpeedia hang-around Jul 8 '13 at 21:32
link
up vote 10 down vote
I have a dual microprocessor system with a PIC24 and a PIC32. The PIC24 sends four bytes to the PIC32, but the first three always disappear.
added by User.1, edited by WikiSpeedia hang-around Jul 8 '13 at 21:32
link
up vote 10 down vote
How does bit-banding on ARM Cortex M0-3-4 work?
added by Mellowcandle, edited by WikiSpeedia hang-around Jul 8 '13 at 21:33
link
up vote 10 down vote
What is an A/B bootloader?
added by Mellowcandle, edited by WikiSpeedia hang-around Jul 8 '13 at 21:33
link
up vote 10 down vote
How do I setup U-Boot for my custom embedded device?
added by BigHomie, edited by WikiSpeedia hang-around Jul 8 '13 at 21:34
link
up vote 10 down vote
How can I boot [embedded board] from an SD card?
added by BigHomie, edited by WikiSpeedia hang-around Jul 8 '13 at 21:35
link
Are there jumpers to set, a special u-boot config? – BigHomie Jul 12 '13 at 12:13
up vote 10 down vote
What is a highly efficient professional process for an embedded design project, from start to finish?
added by BigHomie Apr 18 '13 at 15:07
link
Does one start with the requirements of the embedded system, then pick hardware, or at what point does one pick hardware, before or after a target price is set? Also, is the hardware designed first, then software, or are they both done in parallel? – BigHomie Apr 18 '13 at 15:10
2  
This appears to be an excellent question, an answer to which would help many people entering the field. – Scott Seidman Apr 27 '13 at 12:53
@Scott thnx, I am an experienced programmer, but still a novice with hardware. Getting this site off the ground would be very beneficial for a lot of us including myself. – BigHomie Apr 27 '13 at 20:43
1  
Surely this falls foul of the FAQs: Avoid asking questions that are subjective, argumentative, or require extended discussion... "Best" is very subjective! – Andrew May 9 '13 at 11:31
@Andrew you are correct, I have updated the question accordingly. – BigHomie May 9 '13 at 14:14
up vote 10 down vote
How do I figure out what caused an HWFAULT in Cortex MP3 MCUs?
added by Mellowcandle, edited by WikiSpeedia hang-around Jul 8 '13 at 21:36
link
up vote 10 down vote
How can I achieve multiple analogue output voltages from an embedded controller without using PWM?
added by blarg May 15 '13 at 15:48
link
up vote 10 down vote
Would an FPGA or a CPLD be more suitable for implementing an MMU upon?
added by haneefmubarak Jun 22 '13 at 3:52
link
up vote 10 down vote
How can I avoid "Babble Interrupt" errors when I connect USB devices to my BeagleBone Black?
added by Martin J.H. Jun 25 '13 at 17:57
link
up vote 10 down vote
Should I avoid certain linux distros / programs when running off of an SD card? I am concerned about the limited number of write cycles.
added by superdesk Jul 13 '13 at 14:37
link
1  
...or, specifically, certain filesystems! I've asked a similar question and the solutions didn't look too good... – SF. Aug 2 '13 at 7:41
up vote 10 down vote
How do you design an embedded Linux system for reliable field upgrades, assuming power failures are possible at any time?
added by Patrick Aug 13 '13 at 18:54
link
I'm out of votes, but this is an awesome question! – BigHomie Aug 23 '13 at 13:08
up vote 10 down vote
How do you ensure physical network interfaces always get the same interface name across reboots on an embedded Linux system?
added by Patrick Aug 13 '13 at 19:05
link
up vote 10 down vote
How do you use qemu with named pipes on Linux to emulate a bi-directional serial port?
added by Patrick Aug 13 '13 at 19:25
link
up vote 9 down vote
Which features of the (bugged) FPU of [microcontroller] are safe to use, and which ones are unreliable?
added by SF. Jan 26 '13 at 23:31
link
up vote 9 down vote
Why am I getting garbage data? UART - AVRMega128
added by BenjiWiebe Jan 27 '13 at 1:07
link
up vote 9 down vote
I have Trace32 working with my board. I'm trying out OpenPilot and it hangs all the time. How can I investigate?
added by Gilles Jan 28 '13 at 1:12
link
up vote 9 down vote
My VM implements object marshalling with the assumption that all processes have the same virtual address space. How can I port it to an MPU?
added by Gilles Jan 28 '13 at 1:18
link
up vote 9 down vote
Why does my Microchip XC16 call to sprintf() cause an address exception when using chars?
added by Adam Lawrence Feb 10 '13 at 21:12
link
This really happens btw. :) – Adam Lawrence Feb 10 '13 at 21:13
up vote 9 down vote
AVR - What happens when an ISR is running and another interrupt happens?
added by BenjiWiebe Mar 9 '13 at 14:25
link
<comments removed> Please do not use comments to answer these questions. This proposal is not part of a Q&A site, and the task at hand is to help define what is on and off topic for a site. Comments are here to help improve the questions; not to answer them. See What is the rationale for deleting answers? Thank you. – Robert Cartaino May 6 '13 at 16:38
up vote 9 down vote
How can I reduce the jitter on a GPIO-sourced clock signal?
added by Adam Lawrence Mar 17 '13 at 17:41
link
up vote 9 down vote
How do I get the VGA output for the Freescale i.MX53 SABRE card?
added by BigHomie, edited by WikiSpeedia hang-around Jul 8 '13 at 21:35
link
up vote 9 down vote
How do I calibrate the internal oscillator in an AVR microcontroller?
added by BenjiWiebe Jun 16 '13 at 1:26
link
1 2