UM0313

Supported commands

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7.2

Supported commands

The table below lists the commands supported by the EK302DL firmware:

Note:

AA: register address

DD: data

S: service field

XX, YY, ZZ: Acceleration data returned for the X, Y and Z axes

I1, I2 : interrupt value on each axes.

7.2.1

Start command

The *start command initiates the continuous data acquisition. When this command is sent to

the board, it returns the acceleration data measured by the LIS302DL device. The

acceleration data are packed in a string composed of eight bytes: “s t X Y Z I1 I2 SD”. The

first two bytes are always “s” and “t” which correspond to the hexadecimal values {73 74},

while “X” “Y” “Z” represent, respectively, the acceleration data for the X, Y, Z axes.

“I1” and “I2” contain the values of FF_WU_SRC1 and FF_WU_SRC2, where each bit is a

specific interrupt.

The last byte “s” returns information about the switches mounted on the board. Specifically,

bit#1 and bit#0 of the "service data" correspond to the status of SW3 and SW2 on the

evaluation kit board, and they are set to 1 when the corresponding switch is pressed.

7.2.2

Debug command

The *debug command starts the continuous data acquisition in debug mode. When this

command is sent to the board it returns the acceleration data measured by the LIS302DL

device in readable text format. The values shown on the screen correspond to the content of

the output data registers and are shown as a hexadecimal number. A TAB is employed as a

separator between the different fields.

Table 1.

Supported commands

Command

Description

Returned value

*start

Starts continuous data acquisition

S T x y z I1 I2 s

*debug

Returns the acceleration data in readable

text format

x=XX y=YY z=ZZ

*stop

Stops data acquisition

*rAA

Register read

RAAhDDh

*wAADD

Register write

*bwAA<0:7><0|1>

Single bit write

*Zon

Force 3-state

*Zoff

Exit from 3-state

*dev

Device name

LIS302DL

*ver

Firmware version

302DL 1.1