Using I2c Communication with MyRio

[BenSF]

Hi All,

I am trying to write to a haptic controller through I2c with the My rio device, however, I am having trouble implementing it. My understanding is that I need to first open the channel, configure the channel and then I can use write commands. When I am finished with the I2c I then close the channel.

For my specific project, I am using a multiplexer to communicate multiple channels of the same i2c address. When I send a command to the multiplexer it tells it which haptic controllers to pass the i2c information to. So I first open the channel, then configured the channel. My first write command is to a multiplexer to open up the channel (address 0x70, command 0x0F to open up four channels)(which doesn't produce any errors). However, when I use a second write command to the haptic controller (address 0x5A, data [ bytes 0x01 then 0x05]) it then gives me an error - apparently other people of said the code I am getting is from not receiving an ack bit back. Is there something that I am missing or should be doing differently. I shouldn't be closing and reopening the I2c every time I change the address I am communicating with should I?

Any help is greatly appreciated,

Regards,

Benjamin

[BenSF]

Hi All,

I am trying to write to a haptic controller through I2c with the My rio device, however, I am having trouble implementing it. My understanding is that I need to first open the channel, configure the channel and then I can use write commands. When I am finished with the I2c I then close the channel.

For my specific project, I am using a multiplexer to communicate multiple channels of the same i2c address. When I send a command to the multiplexer it tells it which haptic controllers to pass the i2c information to. So I first open the channel, then configured the channel. My first write command is to a multiplexer to open up the channel (address 0x70, command 0x0F to open up four channels)(which doesn't produce any errors). However, when I use a second write command to the haptic controller (address 0x5A, data [ bytes 0x01 then 0x05]) it then gives me an error - apparently other people of said the code I am getting is from not receiving an ack bit back. Is there something that I am missing or should be doing differently. I shouldn't be closing and reopening the I2c every time I change the address I am communicating with should I?

Any help is greatly appreciated,

Regards,

Benjamin

[ZKami]

Hello BenSF,

What is the error code you are seeing? It would be helpful to know. Are you using LabVIEW? If so, can you attach the vi you created?

[BenSF]

Attached is the labview file and an image of the code. The error message I get is "Error -363011 occurred at myRIO v1.0 Write I2C.vi". In the image you can see probe 1 and probe 2. Probe 1 (after first write command) receives no error, but Probe 2 (after second write command) gets the above error.

Thanks,

Benjamin