MMA7455LT-ND from Freescale Semiconductor to Ardui

Forum 2005-2010 (read only) Hardware Interfacing
1

Hello All

I was hoping for some help with my 3 axis accelerometer. I have been trying to connect the accelerometer via I2c to the Arduino (Mega or Duemilanove). I have used the "TwoWire" library for the I2c part but as far as the accelerometer well its a NO GO.

Any suggestions, existing software, or whatever might help will be appreciated.

Thanks

2

My understanding is the current Wire library will not support devices like the MMA7455 because they require a switch from master transmitter mode to master receiver mode within the same transaction. I believe the Wire library allows you to write in one transaction (master transmitter), read in one transaction (master receiver), but not switch from MT to MR in the middle of the transaction, which the MMA7455 requires.

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The Gadget Shield: accelerometer, RGB LED, IR transmit/receive, light sensor, potentiometers, pushbuttons