Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [arm7]

48 questions
8
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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 mind when I thought about it: I recall that…
goldenmean
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3 answers

DHT21 / AM2301 sensor not measuring humidity

I am trying to use a DHT21 with a Lamobo R1 aka Banana PI R1 to read temperature and humidity, with Armbian/Jessie and a 4.5.2 kernel. A Lamobo R1 is basically an A20 board raspberry pi compatible, with an inverted compatible raspberry pi 2 bus. I…
Rui F Ribeiro
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Driving LEDs directly from microcontroller pins

In the circuit I'm designing, I'm using an at91sam7s128 which is a micro-controller with an ARM7 core. Its PIO0 to PIO31 provide 8mA max which is low to handle direct driving of LEDs like this: simulate this circuit – Schematic created using…
Yahya Tawil
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6
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4 answers

How to decode ARMv7 instructions?

I'm trying to understand ARM instruction encoding. The following image shows C code along with its corresponding assembly instructions: I looked at the ARMv7 reference manual. However, I couldn't find the relationship between the machine code and…
yildizabdullah
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5
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1 answer

i2c on different logic level devices

I'm having a problem making LPC2148 work with SRF10 sensor. LPC is 3.3v device with 5v compatible i2c (at least user docu claims that). On the other side there is SRF10 device which is 5v. I have tried with both levels as pull-up lvl connected with…
Gossamer
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4
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Program only runs when debugging in GDB - using Open OCD and Olimex arm-usb-ocd-h jtag to program at91sam3su

I'm trying to make my Atmel at91sam3u cortex-m3 arm chip make an LED blink. I have a Olimex ARM-USB-OCD-H jtag programmer, and I'm using Open OCD running on OS X to program my chip. I'm using the provided Open OCD startup scripts for the jtag…
Stepan
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1 answer

Pinmode register in lpc2468

Will a PINMODE register in lpc2468 affect the status of an input pin i.e can we enable an internal pull up for an input pin,or it is only possible for output pins.
Eljay
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5 answers

Help fix or ignore aliasing warning in gcc

I'm having a problem working with the TI/Stellaris EK-LM3S6965 demo board and associated software, specifically the OLED display driver. My problem is not that it doesn't work, it's that it mostly works. Except for this one section: // // Clear…
Kevin Vermeer
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Minimum Requirements of a microcontroller to run embedded Linux?

I am looking for the cheapest microcontroller to run embedded Linux. what should I be looking at, which class of microcontrollers or microprocessors is compatible? is there a minimum system requirements (RAM, Flash, clock, etc)?
Rajavarman SL
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1 answer

Which board is better overall for .net mf development, the Tahoe 2 or the GHI EMX module?

Which board is better overall for .net mf development, the Tahoe 2 or the GHI EMX module? Tahoe 2 GHI EMX I'm looking at a general purpose board for plugging in different types of sensors (at once) and using functions like the NIC and SD file io.
Anonymous Type
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Write back buffer in lpc

I was reading the Lpc2148 Manual and in the Static Ram section I came across Write back buffer The SRAM controller incorporates a write-back buffer in order to prevent CPU stalls during back-to-back writes. The write-back buffer always holds the…
Eljay
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2
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2 answers

sending data over bluetooth to my hardware through a matlab serial GUI

I have a hardware with RN-41 bluetooth module and the lpc 214 arm microprocessor.Currently my device only sends data to the PC and I am trying to configure it to be able to receive some commands over bluetooth and perform certain actions e.g. blink…
serendipity
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1 answer

Sparkfun's Uberboard HELP

I bought the Sparkfun's Uberboard a while back and I was trying to run the "Bootloader Tutorial" I followed all the instructions, got the FW.SFE file, but when the Uberboard resets it does not load the code. I got the following: SparkFun USB…
Abelardo
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CAN communication between two ARM MCU's (LPC2129)

I am trying to communicate between two LPC2129 microcontrollers, one as transmitter and the other as receiver, using interrupts to transmit and receive the message. The transmit and receive interrupts are occurring in simulation, but the same is not…
Raghu T C
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How to Debug in APM

I am using Arm Project Manager (APM) for writing the firmware in my ARM board. My question is: What are the live debugging features available in APM? Let's say I need to inspect the value at some pin of the CPU. Any tutorial / video is helpful.
David
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