LSM6DSOX : FSM interruption working only once after flashing. When I turn off and turn on again the device, the FSM does not work anymore ... Did I make a mistake in FSM configuration ?

VLeme.2256 · ‎2020-02-19

Hello,

I use the accelerometer LSM6DSOX. I want to get an interruption when the norm is above 8g.

So I try to use the FSM and configure it. When I flash (for the first time) the system, everything works perfect ! But when I remove my battery and put it again (restart the device), the FSM interrupt do not work anymore (also if I flash again , it still not work) ... I really don't understand where is my mistake ... I followed exactly your AN_FSM doc.

I tried on 2 different prototype, same problem, so it must be software.

Here is the configuration of FSM and Accel (In my main I first call FSM_config and then Accel_config). I just give you the value I write in which register adress :

So first I call FSM_CONFIG : (address / data)

0x10 / 0x00 turn off accel

0x11 / 0x00 turn off gyro

0x01 / 0x80 enable access to embedded function register

0x05 / 0x01 Enable FSM

0x5F / 0x4B FSM odr = 26Hz

0x46 / 0x01 Enable FSM1

0x0B / 0x01interrupt of FSM on int1

0x17 / 0x40 enable write operation on embedded page

0x02 / 0x11 enable access to emb features -> PAGE_SEL = 1

0x08 / 0x7A write PAGE_ADDRESS

0x09 / 0x00 long counter

0x09 / 0x01 one FSM program

0x09 / 0x01 dummy write to increment the write addess

0x09 / 0x00 start adress

0x09 / 0x04 start adress

0x02 / 0x41 configure program on PAGE_SEL = 4

0x08 / 0x00 page adress = 00

0x09 / 0x50 config A

0x09 / 0x00 config B

x0x9 / 0x0C size

0x09 / 0x00 Settings

0x09 / 0x00 reset pointer

0x09 / 0x00 program pointer

0x09 / 0x00 thresh LSB

0x09 / 0x48 thresh MSB

0x09 / 0x03 mask A

0x09 / 0x00 Tmask A

0x09 / 0x05 NOP | GNTH1

0x09 / 0x22 Contrel

0x02 / 0x01 disable access to emb feat reg PAGE_SEL = 0

0x17 / 0x00 PAGE_WR disable write operation

0x01 / 0x00 disable access to embedded function reg

0x5E / 0x02 MD1_CFG = 1 : interrupt on int 1

Then I call Accel_config :

0x10 / 0x34 accel active, 52Hz, full scale 16g

0x12 / 0x04 multiple access with I2C

0x14 / 0x80 low power mode enable

main () {

FSM_CONFIG();

ACCEL_CONFIG;

Where am I wrong ? Why does it work first but after restart it does not work anymore ?

Waiting for your reply,

Thanks !

Valentin

Eleon BORLINI · ‎2020-02-20

Hi @VLeme.2256 , the restart procedure resets the internal memory flash. When you restart the device, you have to configure again your FSM registers, and I suggest you to save them in your sw to speed up this process. Regards

VLeme.2256 · ‎2020-02-21

Hello,

Yes I know that, that's why I configure my FSM at the start of my main loop. So on restart, the accelerometer is reconfigured.

I found a solution, with a software reset of the LSMDSOX before configure it, it works properly.

Thank you for your time !

Regards,

Valentin