why IIS3DWB timestamp values are zero ?

[mete]

I have timestamp counter enabled and batching to FIFO with decimation=1. I can see the timestamp values are interleaved with the accelerometer values, but the timestamp values are always 0 like this (this is SPI trace):

22 00 00 00 00 00 0A
12 32 F7 2F FC 9A 41
24 00 00 00 00 00 0A
14 DE F6 AE FC 94 43
27 00 00 00 00 00 0A
17 9B F6 3E FC 23 40
21 00 00 00 00 00 0A
11 EE F6 46 FC A6 42
22 00 00 00 00 00 0A
12 49 F7 54 FC 69 42

The last byte 0A contains I guess the BDL (1010), and tag sensor is 0x4 so it should be timestamp value but why does it contain only zeroes ?

[Federica Bossi]

Hi @mete ,

Can you share a reg dump? I need to see what are you writing in each register.

Thanks

[mete · Accepted solution]

Hi @Federica Bossi , sorry my mistake as expected, I miswrote the address of the register where timestamp counter is enabled.

[Ginkgo]

Hi @mete and @Federica Bossi, I am not sure if it's ok to "reply" to a resolved topic but it seems to me I have a very similar issue with the iis2mdc magnetometer. I am able to get the values of the magnetic fields (along x,y,z) but the timestamp is always 0.

root@linux:/sys/devices/platform/soc@0/soc@0:bus@30800000/30a50000.i2c/i2c-3/3-001e/iio:device2/buffer# hexdump -C /dev/iio:\device2

00000000  85 01 20 00 34 fe 00 00  00 00 00 00 00 00 00 00  |.. .4...........|

00000010  87 01 24 00 31 fe 00 00  00 00 00 00 00 00 00 00  |..$.1...........|

In your answers you talk about register addresses, could you please tell me where can I check these values? 

Thanks

[mete]

The register addresses are in the datasheet but I do not see timestamping is mentioned for IIS2MDC.