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Questions tagged [arm]

32-bit microcontroller IP. The ARM company which designs the ARM cores doesn't make controllers itself, but licences the IP to other manufacturers. ARM is the leading 32-bit controller and is available from tens of suppliers.

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17
votes
5answers
25k views

Best pattern for WFI (wait-for-interrupt) on Cortex (ARM) microcontrolers

I'm looking into developing battery-powered software using the EFM Gekko controllers (http://energymicro.com/) and would like the controller to be asleep whenever there's nothing useful for it to be ...
12
votes
2answers
6k views

How can I use a build server with Keil uVision4 (MDK-ARM), script a build, use a makefile?

I would like run daily builds, or check-in/commit triggered builds of Keil MDK-ARM based projects. So far I've gotten things going with the batch file feature of the IDE. This does require you to ...
2
votes
5answers
1k views

Arm development board with lots of PWMs [closed]

I am looking for a Arm development board for a new project I am working on (64 RGB LED POV Globe). POV globe speed questions I have lots of experience with the Arduino boards but I would like to take ...
7
votes
1answer
583 views

On Freescale iMX31, how can I translate SDRAM address to CPU address?

[This is a re-post of https://stackoverflow.com/q/5346225/69172] I'm new to iMX31 and embedded systems, please help me to understand the translation from SDRAM address to ARM CPU address, especially ...
1
vote
3answers
1k views

Bit banging a UART

I am trying to interface the GPS module with my ARM board. GPS sends RS232 signals from its single pin (say pin Z). I want to use the watchdog timer for receiving and parsing the serial stream. Any ...
13
votes
4answers
23k views

Is it possible to make a JTAG interface with an arduino?

If so, could one direct me to a site that tells how to do this? I believe I may have found a way, but I am unsure as to whether or not it would work yet (need to find something to test it on). This ...
5
votes
5answers
772 views

Beginning arm cortex Ax hardware development

Where can one find information on how to put together a minimal linux bootable board based on the cortex A family (like the beagleboard)? Programming information is plentyfull, but hardware knowledge ...
2
votes
3answers
4k views

How do I in-system program LPC17XX?

I plan to buy an mbed module to get started with NXP LPC17XX. Developing and downloading code seem the easiest possible. What are my options for in-system programming this code in non-mbed devices? I ...
5
votes
6answers
569 views

Does my open source project need be Arduino based to be successful?

I am debating which micro-controller to use for a new open source hardware project. Spec wise, I would rather use an ARM Cortex M3, which is at a similar price-point to an Arduino(avr) based solution ...
7
votes
6answers
3k views

getting started with NXP microcontrollers - Programmers/IDEs/Compilers/Eval Boards

I asked this question ago. (Don't need to read it to answer this one) out growing 8-bit AVRs, not sure where to move on to I really liked the answers about the NXP line of microcontrollers. I'm ...
8
votes
12answers
950 views

out growing 8-bit AVRs, not sure where to move on to

I've been using 8-bit AVRS for a few years now. Lately, I've been feeling limited by the peripheral data transfer speeds and higher level libraries. I'm having trouble finding/picking a new line of ...
7
votes
6answers
1k views

Suggestions on what to get my boyfriend for Christmas? (interested in PIC24, MSP430, Propeller, FPGA, ARM, etc..)

I'm at a standstill on ideas for what to get him and would really, really appreciate any recommendations you guys can provide! (Also, he frequents this site but promised to not read this.) So far, I ...
2
votes
4answers
19k views

How to implement delay functions in Keil ARM MDK [closed]

How to implement delay function in Keil ARM MDK that waits given time in microseconds that can be recompiled to any reasonable clock speed defined in Keil project settings ? And all of this without ...
12
votes
5answers
2k views

Minimalist Cortex-A9 design

Does anyone know of a good basic Cortex-A9 design? Something with just enough to run with power and ethernet? I'm looking for something as a starting point and maybe with eagle files. edit: While ...
3
votes
1answer
140 views

Any ideas on what to do with a board that condition is unknown?

I got given a Cirrus Logic EDB7209-2B.0 with LCD Display. It powers up(the power LED lights up and there is power on the board accessing the ARM CPU) but i'm unsure on what to do with it has anyone ...
2
votes
1answer
367 views

Where can I get a microcontroller board for TI Stellaris?

I'm Looking at using one of the TI ARM chips (see list below) and I'm wondering what I should be looking for to do experiments with, the computer equivalent of breadboarding. I've seen Development ...
22
votes
5answers
4k views

Cortex-m3 toolchain

I am looking for a free (as in freedom) tool chain for Linux (Ubuntu) that allows me to develop for an ARM cortex-m3 (lpc1343) microcontroller. Where do I find such a toolchain? Are there any ...
9
votes
4answers
8k views

Latest ARM processors that are not BGA

I am looking for an ARM, preferably with an MMU, that is not in a BGA package so hobbyists reflow it at home.
1
vote
1answer
341 views

how to enable and configure USB OTG for device mode on iMX31 Litekit?

I need to configure USB OTG on iMX31 for device mode. We need a raw channel between the host and target and usb seems to be the best suited. However I haven't been able to correctly configure the OTG ...
9
votes
2answers
9k views

About Code Density and its definition

I have a conceptual question: What means "high" code density? and why is it so important?
3
votes
2answers
193 views

Where can I find the in-depth LPC2132 datasheet?

I have searched high and low on Google for the user manual about the LPC2132 ARM chip. So far, all I have come up with is the ARM7TDMI manual and a short (41 pages) overview of the LPC2132 chip. ...
2
votes
2answers
4k views

How can I set up an SPI interface between an LPC2132 ARM and a Cyclone FPGA?

I am trying to make an ARM LPC2132 chip and a Altera Cyclone FPGA communicate using the SPI protocol. Specifically, I have the Saxo-L board from KNJN, which has the signals pre-wired between the two ...
4
votes
3answers
301 views

LPC2131 problem reading IO pins

I need to read a value from a DIP switch. It is connected to ports P1.16 till P1.21. I use following code: to initialize: ...
5
votes
3answers
3k views

Is it possible to reset NXP LPC2100 microcontroller from code

I'm curious? A watchdog timer could do this, but I would like to do it manually.
9
votes
4answers
1k views

Building a circuit with LPC1343

Have people here used the LPC1343 Cortex-M3 chip? I've built a few small circuits with PIC microcontrollers before but now I'm using an LPC1243 Cortex-3/ARM. I've been using an LPCXpresso prototype ...
5
votes
4answers
334 views

What configuration should I use for a system that includes an ARM and an FPGA?

I have a design that uses an Altera Cyclone FPGA to implement a Physically Unclonable Function (PUF) and an ARM device to do cryptographic work and I/O with the PUF. The PUF is very large, and takes ...
2
votes
3answers
11k views

How to configure an ARM GPIO port (STR9) to an alternate function?

Because I am new to programming on microcontrollers coming from the C++ world, I have been studying on getting code running on a microcontroller board to work with many inputs and outputs. For the ...
13
votes
4answers
18k views

What is a good choice for an ARM to interface with external memory?

I just completed a project using the LPC2132 chip, but ran into problems with using up the whole 64kb of RAM. For my next project, I'd like to use something that can reference an external, much ...
23
votes
5answers
11k views

Cheapest ARM with an MMU [closed]

What is the cheapest ARM processor with an MMU so I don't have to use uCLinux? Bonus for non-bga and integrated RAM/Flash
11
votes
4answers
7k views

Is it possible to drive TTL inputs from 3.3v microcontroller

I need a quick heads up on a problem I am trying to solve at work. I'm trying to connect to a parallel data port on an interface module we use to access smart cards. The port has an 8bit input and an ...
7
votes
4answers
4k views

What's the best bootloader for an embedded Linux board?

I'm designing an embedded Linux board for use as a web-based controller. It will be based around an Atmel AT91SAM9G20, which uses an ARM926EJ-S core. Anyone have particularly good or bad experiences ...
9
votes
8answers
10k views

Best way to install arm-elf-gcc onto a Linux machine

Hey folks, I'm working on a device using arm-elf-gcc to compile code for a MakingThings prototype board. My development machine is a Linux box running Ubuntu 9.10. On a different linux box using ...
7
votes
6answers
889 views

Is there a Cortex-M3 with external voltage regulators?

Does anyone know of an ARM Cortex-M3 microcontroller with both the 3.3V peripheral and 1.8V core voltages supplied by external sources? Everything I have found so far has an internal regulator for ...
6
votes
2answers
4k views

Best development board for ARM9? [closed]

I am looking for a cheap but powerful dev board for an ARM9 processor. It needs to be able to run linux. I am unsure about the exact specifications for RAM and such(thats partly why I'm posting this ...
6
votes
3answers
3k views

ARM watchdog reset

I have an MP3 development board I picked up from sparkfun that runs off the LPC2148 ARM processor. In looking through the code, I see a function to force a watchdog reset. My question is, how do you ...
41
votes
10answers
48k views

Why is AVR used in Arduino?

Why is Arduino using AVR? I understand that they are the official processor but there isn't a reason the code couldn't be ported to an ARM or a Freescale architecture other than cost, right? As long ...
36
votes
13answers
22k views

ARM Cortex-M3 development tools?

I am planning to migrate to the NXP Cortex M3 architecture and I'm a little lost between the existant development tools. Keil is expensive and I don't know if it's worth it. Anyone who has tried some ...
7
votes
2answers
1k views

Relation between power consumed and MCPS (million cycles per second) consumed on a processor

I have been working on a ARM cortex A8 board on MP3 decoder. While doing this I have a requirement saying the MP3 decoder solution I am doing should consume 50 mW. This generated few questions in my ...
33
votes
15answers
1k views

What microprocessor for experimentation?

I harbor a secret fantasy (oops, not so secret anymore) to build a simple computer from scratch. I'm looking for an easy-to-use microprocessor to start with. I know about the usual suspects such as ...