Returned value of *start command for ISM330BX and STEVAL-MKI109D

[jtmadsen]

Hello,

I have bought an ISM330BX | Product - STMicroelectronics and a STEVAL-MKI109D | Product - STMicroelectronics. I can get it to stream data by using:

*setdb245ka 

*zoff 

*gw1009 

*gw1109

*start

OR

*debug

For debug this streams something like:

AX = -7303 AY = -4734 AZ =-13823

GX = -429 GY = +271 GZ = +358

QVAR =  +0 QVAR_FILTERED =  +0

For start, it is binary and i can convert it.

According to page 21 of this manual, STEVAL-MKI109D Professional MEMS Tool motherboard for MEMS adapter boards - User manual , this is the returned value of *start:

UIstring: s t A_XH A_XL A_YH A_YL A_ZH A_ZL G_XH G_XL G_YH G_YL G_ZH G_ZL QH QL Q_FH Q_FL A_Int1 A_Int2 FSMLC_INT FSM1 StpL StpH DT1 DT2 DT3 DT4 TL TH sw1|sw2 \r \n

TDMstring: t d A_XH A_XL A_YH A_YL A_ZH A_ZL 'T' \r \n

SFLPstring: s t A_XH A_XL A_YH A_YL A_ZH A_ZL G_XH G_XL G_YH G_YL G_ZH G_ZL Q0_L Q0_H Q1_L Q1_H Q2_L Q2_H gbiasX_H gbiasX_L gbiasY_H gbiasY_L gbiasZ_H gbiasZ_L gravX_H gravX_L gravY_H gravY_L gravZ_L gravZ_H \r \n

UIstring + time: s t A_XH A_XL A_YH A_YL A_ZH A_ZL G_XH G_XL G_YH G_YL G_ZH G_ZL QH QL Q_FH Q_FL A_Int1 A_Int2FSMLC_INT FSM1 StpL StpH DT1 DT2 DT3 DT4 TL TH sw1|sw2 TS_XL TS_L TS_H TS_XH \r \n

TDMstring+time: t d A_XH A_XL A_YH A_YL A_ZH A_ZL 'T' TS_XL TS_L TS_H TS_XH \r \n

SFLPstring+time: s t A_XH A_XL A_YH A_YL A_ZH A_ZL G_XH G_XL G_YH G_YL G_ZH G_ZL Q0_L Q0_H Q1_L Q1_H Q2_L Q2_H gbiasX_H gbiasX_L gbiasY_H gbiasY_L gbiasZ_H gbiasZ_L gravX_H gravX_L gravY_H gravY_L gravZ_L gravZ_H TS_XL TS_L TS_H TS_XH \r \n

The initial part of the top one matches with my *start output when I run it and convert it from binary.

My question now is: Which commands should I write for changing the returned values to the SFLPstring as written in the manual? I am interested in the different bias, the gravity vector and the quaternions.

Thank you, Jeppe

[Federica Bossi]

Hi @jtmadsen ,

You can do this:

1. Connect STEVAL‑MKI109D + ISM330BX to PC and open Unico‑GUI or MEMS Studio
2. Select ISM330BX.
3. In the GUI:
   • Enable Sensor Fusion / SFLP 
   • Enable outputs you care about:
     • Quaternion components q0,q1,q2q​0​​,q​1​​,q​2​​,
     • Gravity vector,
     • Gyro bias (gbias).
   • Start streaming from GUI

[jtmadsen]

Hi @Federica Bossi,

Thank you for the response.

As I will be connecting this to a small arm pc without a screen and running a script, I am not able to use any programs with a GUI. This is why I looked into doing this with commands instead of a GUI. Is it somehow possible without a GUI?

Best, Jeppe

[Federica Bossi]

Hi @jtmadsen ,

If you don’t want to use a GUI, you can work entirely from a serial terminal/plotter like SerialPlot. In this case, you send the configuration commands (such as *setdb..., *gw..., *start, *debug) directly over the serial port, and SerialPlot will both control the board and read back the data stream. This lets you configure the sensor, start/stop acquisition, and visualize or log the data in real time without relying on Unico or MEMS Studio.

[jtmadsen]

Hi @Federica Bossi,

Thank you for the response.

My question is how to make these commands stream the results of the SFLP as I asked in my initial question.

Best,

Jeppe