2 replies to this topic

[giusjuve]

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]Hi,[/color]

 

I have a problem with my accelerometer LSM303DLM [color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]. It don't comunicate with my netduino 2 (firmware 4.2.2).[/color]

The line SDA, SCL are connected with [color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]pull-up resistors in the Pin 5V.[/color]

I used I2CBus.cs posted by phantomtypist here:  http://forums.netdui...rch=1#entry4156.

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]When I  try a read or write operation the answer is always 0 ( both the number of byte transferred and the byte written in the buffer ). [/color]

The code used for send data to the device is the following:

 I2CBus bus = I2CBus.GetInstance(); I2CDevice.Configuration accWrite = new I2CDevice.Configuration(0x30, FREQUENCY);  bus.WriteRegister(accWrite,0x20,0x27,TIMEOUT); I2CDevice.Configuration accRead = new I2CDevice.Configuration(0x31, FREQUENCY);  bus.ReadRegister(accRead, 0x0F, buffer, TIMEOUT);

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]Any idea on what is causing this?[/color]

 

 

 

Attached Files

•  I2CBus.cs   5.67KB   7 downloads
•  Program.cs   1KB   4 downloads

[bionicco]

Hi Gius,

the problem is in the address!

You try tu use 30h and 31h, one for write and one for reading, maybe because in the reference sheet of the the device they are written as the address of the device. But you have to use only the first 7 bit of the address for pointing to the device and the last one will be added by the driver, 1 in case of write and 0 in case of read.

So when you create the configuration use 18h (30h shift 1 right) instead of 30h and it should work.

[jeffs47]

I'm having the same issue, though I don't have any Pull-ups (schematics show they're already there). I keep trying to write to the device and I get 0.