Hi,

<< to those of you who already used the ADXL312 or similar >>

I have an SPI/I2C-Accelerometer (ADXL312) from Analog Devices which I 
want to use in combination with an ATXmega128A1.

I have already successfully set up the I2C connection, but I cant get 
any valid data from the x,y and z registers.

I can read the DEVICE_ID and my initialisation looks as follows:
DATA_FORMAT: 0x08
POWER_CTL: 0x08
INT_ENABLE: 0x80

After that, the only data I get from the X0,X1,Y0,.. registers are 
those:
x00 xf0   X0,1
x00 xf0   Y0,1
x00 xf0   Z0,1

Does anyone know what might be the reason for that? Did I forget a part 
of the initialisation?

BTW, this is a complete register dump, done with a multi-byte read.

1

xe5 x02 x00 x00    0:DEVID, R, R, R

2

x00 x00 x00 x00    4:R, R, R, R

3

x00 x00 x00 x00    8:R, R, R, R

4

x00 x00 x00 x4a   12:R, R, R, R

5

x82 x00 x32 x00   16:R, R, R, R

6

x00 x80 x80 x80   20:R, R, R, R

7

x00 x00 x00 x63   24:R, R, R, R

8

x00 x00 x00 x00   28:R, R, OFSX, OFSY

9

x00 x00 x00 x00   32:OFSZ, R, R, R

10

x00 x00 x00 x00   36:THRESH_ACT, THRESH_INACT, TIME_INACT, ACT_INACT_CTL

11

x00 x00 x00 x00   40:R, R, R, R

12

x0a x08 x80 x00   44:BW_RATE, POWER_CTL, INT_EN, INT_MAP

13

x02 x0b x00 xf0   48:INT_SOURCE, DATA_FORMAT, X0, X1

14

x00 xf0 x00 xf0   52:Y0, Y1, Z0, Z1

15

x00 x00           56:FIFO_CTL, FIFO_STATUS

16

17

R: Rerved/Not in use

Hey,

I solved the problem, I did a Design-Mistake with some 'Do-Not-Connect' 
Pins ;)

You'll find my code in the attachment, in case someone or 'whatisthis' 
will need it.. ;)
The twi_master_driver.* files are based on a AppNote from Atmel for the 
XMEGA-TWI.

Cheers