UM0855 datasheet(25/35 Pages) STMICROELECTRONICS

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UM0855

Supported commands

Doc ID 16617 Rev 1

25/35

Supported commands

The microcontroller mounted on the STEVAL-MKI0xxV1 board is equipped with dedicated

firmware which supports a set of commands that allow control of the single axis digital

output MEMS sensor and permit the acquisition of the measured angular rate data. The

firmware also handles the communication between the STEVAL-MKI0xxV1 and the PC

through the USB bus. These features allow users to easily write their own applications to

exploit the capabilities of the gyroscope.

This section describes the commands that are supported by the firmware for the

microcontroller of the STEVAL-MKI0xxV1 demonstration kit.

7.1

Getting started

Before using the commands supported by the firmware, the following procedure must be

performed:

Connect the STEVAL-MKI0xxV1 to the USB port.

Launch an application that allows the sending of commands through the virtual serial

port. The remainder of this document assumes the use of Microsoft’s Hyper Terminal

program, available with the Windows XP operating system.

Create a new connection, enter a name (ex. “STEVAL-MKI0xxV1”), and click “OK”.

In the “Connect Using” field, select the virtual COM port to which the USB port has

been mapped, and click “OK”.

In port settings, set bits per second to 115200, data bits to 8, parity to none, stop bits to

1, and flow control to none. Click “OK”.

In the “Hyper Terminal” application window choose “files” > “properties” > “settings”,

then click on the “ASCII Setup” button.

Select “Send line ends with line feeds” and “Echo typed characters locally”.

Click the “OK” button to close the “ASCII Setup” window.

Click the “OK” button to close the “Properties” window.

Once this procedure has been completed the user can utilize the commands described in

the following sections by typing them into the Hyper Terminal window.

7.2

Supported commands

The table below lists the commands supported by the STEVAL-MKI0xxV1 firmware.

Some commands are valid only for DCWM. Using them outside of DCWM could result in

unexpected errors.

Table 5.

Supported commands

Command

Description

Returned value

Available

in WM

*start

Starts continuous data acquisition

s t R 4O2 O2 4O1 O1 oh S

*debug

Returns the angular rate data in readable text

format

4*[OUTX=XXXXX]

VREF=XXXXX

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