Unanswered Questions

9
votes
2answers
2k views

How to implement critical sections on ARM Cortex A9

I am porting some legacy code from an ARM926 core to CortexA9. This code is baremetal and does not include an OS or standard libraries, all custom. I am having a failure that appears to be related ...
6
votes
1answer
157 views

limit duration 1pps signal

As a beginner in electronics, I would appreciate very much to get some input from you folks for my project, so I can decide in what direction to point my nose :) What would I like to do? I would ...
6
votes
0answers
523 views

Typical zero sequence data for 80MVA transformer

I need to model a 80MVA transformer 132/33kV built in 1973. There is very little information on this transformer but I need to populate certain values in the model. Where can I find typical zero ...
5
votes
0answers
83 views

Better approach for maximizing Cooling Fan Life Expectancy

We are working on a product which is extremely cost sensitive. It generates a lot of heat so we are planning to use a heat sink. For those 'very rare edge causes' where heat sink alone cannot cool ...
5
votes
0answers
131 views

GaN pulsed operation

Does anybody have experience biasing and pulsing a microwave GaN HEMT? I've just ordered a 10 Watt S-band transistor. I know all about bias sequencing. This application is pulsed. I've read about ...
4
votes
0answers
112 views

TMS320 Floating Point (Texas Instruments DSP from '98)

Background Is there anybody here who is an EE with programming experience who has worked with the Texas Instruments TMS320 C3X-series DSP? I am currently doing some work with the C3X for a project. ...
4
votes
0answers
364 views

Error interfacing GSM sim900 with atmega32

Hi all I am trying to interface GSM SIM900 with atmega32. I have a written a code in which if a user press a push button, a call will be made to a pre defined number. If we want to change the pre ...
4
votes
0answers
3k views

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 ...
4
votes
1answer
153 views

GPS Power consumption MTK3339 vs SirfIII for periodic logging application

I am currently working on redesigning a SirfIII based battery operated GPS logger. A MTK3339 based GPS module has been selected due to overall (advertised) performance. The GPS logger uses a ...
4
votes
3answers
380 views

How to control a cellphone using an Arduino?

I wish to control a classic cellphone using an Arduino Nano by connecting the cellphone keys to digital pins, and switch them using a program that I will put on the Arduino. The idea is to make a ...
3
votes
2answers
36 views

Is printf debugging over JTAG (not SWD) with STM32 possible?

The question is very similar to this one: I'd like to to printf debugging via the ST-LINK adapter and JTAG, not SWD, in IAR Workbench. Is this possible?
3
votes
1answer
89 views

MPU-6050 angle readings under mechanical vibrations

I'm in process of making a quadcopter. At this point I encountered a problem with MPU-6050 angle calculation. When quadcopter is stationary with motors in off state and I'm tilting it, angle readings ...
3
votes
0answers
69 views

How to construct High Speed Log Amplifiers

Objective : converting laser pulses from photo diode ranging from 10nA - 100mA (60dB dynamic range of incident power) to digital format, for measuring pulse width exactly pulse width 10ns and ...
3
votes
1answer
64 views

ATSAM3X8E: Custom Arduino Due Design

I'm currentlry doing a redesign of the Arduino Due board to include some additional features I need. Browsing through the Datasheet of the ATMSAM3X8E atmel chip, I noticed that the 12Mhz Oszillator ...
3
votes
0answers
60 views

Altium Designer 16: Baked symbols in schematic templates

I have a small number of template projects, including project file, schematic file, PCB file and Array file. These were created in AD 14, updated to 15 and now 16. The schematic contains a number of ...

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