H3LIS331DL configuartion issues

[Thangaraj Ponnusamy]

Posted on February 09, 2018 at 16:32

Hi,

I am working with H3LIS331DL sensor . my configuration is as follows

1. 1Power on the sensor
2. configure the control register 1 with normal power mode and data rate 1000hz
3. configure interrupt source1 for data ready interrupt
4. GPIO call back registered for data ready interrupt.

This scenario is working fine. we are sampling after getting the data ready interrupt.

I have some special cases where i am facing some issues.

if there is some delay in step 2 and step 3 due to some other register configuration example configuring thecontrol register 4 then (in between step 2 and 3)i am not getting the data ready interrupt. This is one issue.

Next one is after step 4 if get data ready interrupt in case if i delayed to clear the data ready interrupt by reading the data for more than 3 msec then next data ready interrupt is not triggering.

could you help me is there is sequence needs to be followed?

or what could be the reason for the above 2 issues.

thanks in advance.

with Regards,

Thangaraj.P

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[Miroslav BATEK]

Posted on February 14, 2018 at 14:29

Only setting of two registers is needed to make this functional.

CTRL_REG1 = 0x3F

CTRL_REG3 = 0x02

The communication should look like this:

I suppose you are reading the data too slowly, so new data are available earlier than you read all registers or you are not reading all output registers so the DRDY is not cleared. Please check you communication with scope or logic analyzer and eventually share it with me.

You can also try to reduce the the ODR.

[Thangaraj Ponnusamy]

Posted on February 14, 2018 at 15:13

Hi,

As i already mentioned this is working fine.But the below configuration in the below sequence is the issue what i am explained above

CTRL_REG1 = 0x3F

CTRL_REG1 = 0x80

CTRL_REG3 = 0x02