Supported commands

UM0313

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7.2.3

Stop command

The *stop command interrupts any acquisition session that has been started with either the

*start or *debug commands.

7.2.4

Register read

The *rAA command allows the contents of the LIS302DL device registers in the evaluation

kit board to be read. AA, expressed as hexadecimal value and written in upper-case,

represents the address of the register to be read.

Once the read command is issued, the board will return RAAhDDh, where AA is the address

sent by the user and DD is the data present in the register.

For example, to read the CTRL_REG1 the user would issue the command *r20, which

returns R20hC7h.

7.2.5

Register write

The *wAADD command permits writing to the contents of the LIS302DL device registers in

the evaluation kit board. AA and DD, expressed as hexadecimal values and written in upper-

case, represent respectively the address of the register and the data to be written. To write

0xC7 to the CTRL_REG1, for example, the user would issue the command *w20C7.

7.2.6

Single bit write

Using this command it is possible to set/reset a single bit in a given register. The command

*bwAA<0:7><0|1> requires the user to specify the address AA of the register in which to

change the bit, with AA expressed as a hexadecimal value and written in lower-case,

followed by the position of the bit to be changed, an integer between 0 and 7, and the value,

either 0 or 1, to be associated to the specified bit.

For example, to set to 1 the FS bit within the CTRL_REG2, the user would issue the

command *bw2171.

7.2.7

Zon and Zoff

The *Zon and *Zoff commands are employed respectively to put into 3-state (i.e. high-

impedance) and to exit (i.e. normal mode) the SPI lines of the ST7-USB microcontroller

mounted on the evaluation kit. These commands allow the isolation of the sensor from the

microprocessor in the event that an external control (from a different microcontroller

mounted on a separate board) is needed.

By default, when the kit is first turned on, the SPI lines are in 3-state mode and the user is

required to send the command *Zoff to allow the communication between the sensor and

the microcontroller.

7.2.8

Device name

The *dev command retrieves the name of the device mounted on the evaluation kit

connected to the PC. For the EK302DL, the returned value is “LIS302DL”.