4 replies to this topic

[Frode]

Hi,

I'm trying to write a driver for the MPL3115A2 Altimeter, but have some trouble with the I2C communication. I've got several other I2C devices working fine, so I think there is a particularity with this device I'm having trouble with.

 

The Arduino example code says this, at the bottom of the page:

 

byte [color=rgb(153,0,0);font-weight:bold;]IIC_Read[/color](byte regAddr)

{

[color=rgb(153,153,136);font-style:italic;]// This function reads one byte over IIC[/color]

Wire.beginTransmission(MPL3115A2_ADDRESS);

Wire.write(regAddr); [color=rgb(153,153,136);font-style:italic;]// Address of CTRL_REG1[/color]

Wire.endTransmission([color=rgb(0,134,179);]false[/color]); [color=rgb(153,153,136);font-style:italic;]// Send data to I2C dev with option for a repeated start. THIS IS NECESSARY and not supported before Arduino V1.0.1![/color]

Wire.requestFrom(MPL3115A2_ADDRESS, [color=rgb(0,153,153);]1[/color]); [color=rgb(153,153,136);font-style:italic;]// Request the data...[/color]

return Wire.read();

}

 

I have a feeling my problem occurs because I cannot find a C#-equivalent for endTransmission(false);

Does anyone have an idea on how I can accomplish the same with C#?

 

Here is the code I use. It uses the I2C helperclass found in this thread.

 

            byte[] readBuffer = new byte[1];

            bus.ReadRegister(config, (byte)Registers.CTRL_REG1, readBuffer, Timeout);

 

Whatever I do I only get 0-values back from the device.

[TinkeringTurtle]

The endTransmission() parameter is setting the internal address feature (repeated start bit). Have you checked this out yet?

[Frode]

Thanks, I agree, that seems to be valid for my case. I'll try to figure it out from Chris's example.

[scardinale]

Did you ever get this working, I am having the same problem. Would you mind sharing your code?

[Frode]

No, unfortunatly not. I think I stopped working on it after posting in this thread:

http://forums.netdui...ort/#entry56305