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Topics I've Started
SD card write times
21 August 2012 - 09:41 AM
Hello,
I made a software that writes about 30 kB of data on SD creating a new file each time. If I leave this software running for some days I find that the writing time increases from about 20 secs to about 50 secs when there are about 10000 files.
Does anyone have any reason for this happening?
Powering through 3.3V
16 August 2012 - 01:37 PM
I tried to power N+ via the 3.3V pin on the power connector, Leds turn on and the uC seems to be working correctly, but writing to SD card doesn't seem to work ( while via USB the same code writes correctly to the SD card ).
SD Card create directory
21 June 2012 - 05:17 PM
Hello,
I can write files to the SD\ root but can't manage to create directories..
I tried to use
Directory.SetCurrentDirectory("SD");
Directory.CreateDirectory("Netduino");
as in http://www.dyadica.c...d-card-example/
but nothing happens..
also tried to put the new directory in the filename while creating a filestream but i get exception.
I2C and ADXL345 maxing sample rate
16 June 2012 - 06:45 PM
Hello,
I got my ND+ working with an ADXL345 accelerometer via I2C. I have needs to sample accelerations above 1 KHz for vibration analysis purpose, but I didn't get to it so far.
My current testing code makes 1000 cycles of readings saving start time and end time.
What I see is that if I set I2C to 400 KHz I get 2.6 ms per cycle, while setting I2C to 100 KHz I get 3.3 ms.
This brings me supposing that there is a 2.4 ms per cycle overhead outside of I2C communication time.
Is it possibile that Netduino take so long to manage I2C and saving incoming data to memory ( I'm using I2CDevice from NetMF 4.2 )?
I'm thinking that it's due to debugger. Even if I set the project to 'Release' configuration Output window start saying 'Found debugger!' and prints every Debug.Print.
May I have to deploy in other ways to exclude debugger and save times?
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