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h3mp

Member Since 23 Nov 2011
Offline Last Active Oct 07 2019 12:29 PM
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Topics I've Started

Netduino runs faster when debugging

01 March 2015 - 04:22 PM

..just an observation which I dont understand!

 

I have a simple program running at the moment that just reads a sensor and writes the result to a serial port...

every time it goes around the loop it toggles between two LEDs

 

while (true)

{

ToggleTwoLEDs();

ReadSensor();

WriteResultToSerialPort();

}

 

while running in visual studio the loop runs very quickly, when i stop debugging the LEDs toggling reduces to about quarter the speed (according to my eyes)..

 

what is going on?

 

 


I2C not working on plus 2 (or regular 2)

19 February 2015 - 02:53 PM

I have an app on the netduino1 which reads a LSM9DS0 sensor - all works fine.

 

Tried it on the netduino-plus2 (and netduino2) and neither get any i2c data back.

 

i've re-wired a5 to sc and a4 to sd, surely this is all i need to do for it to work!?


I2C on original netduino not reading multiple bytes

17 February 2015 - 10:21 PM

I'm new to I2C so apologies in advance  :D

 

I'm trying to read multiple registers at once from a LSM9DS0 accelerometer/gyro/compass chip..

 

Each sensor has 6 registers in a row that return X/Y/Z high and low bytes.. so i should be able to use the I2C_ADDRESS of the chip's XM sensor, then point a 'read' at the first of the 6 registers then i was hoping that would return an array of that register plus the next 5..

 

I use code based on this following example i found on the web:


I2CDevice.Configuration config = new I2CDevice.Configuration(I2C_ADDRESS, I2C_CLOCK_RATE_KHZ);
I2CDevice i2c = new I2CDevice(config);

byte write = { AddressOfFirstRegisterIneed };
byte read = new byte[6]; //surely this should return the first and subsequent 5 registers?
// create I2C write and read transaction
I2CDevice.I2CTransaction i2cTx = new I2CDevice.I2CTransaction[2];
i2cTx[0] = I2CDevice.CreateWriteTransaction(write);
i2cTx[1] = I2CDevice.CreateReadTransaction(read);
// execution
i2c.Execute(i2cTx, I2C_TIMEOUT);

 

..what i get back is an array of bytes all containing the same value!? (there should be 6 distinct values returned).

 

if i do 6 separate transactions one after another reading just 1 byte, then i can return all 6 registers successfully..

 

but as they are all in a row should i not be able to do all this in one transaction?  :wacko:

 

(i'm doing this on my old Netduino 1 that is probably running 4.2.0 update1 as i didnt have any newer netduinos in my office today)

 

 

 


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