Reply To: Odd values from accelerometer & gyroscope

[Peter]

Hi, Peter,

This is what I get by issuing the command “i2cdetect -y 1” to my raspberry pi 3:

0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          — — — — — — — — — — — — —
10: — — — — — — — — — — — — 1c — — —
20: — — — — — — — — — — — — — — — —
30: — — — — — — — — — — — — — — — —
40: — — — — — — UU — — — — — — — — —
50: — — — — — — — — — — — — 5c — — 5f
60: — — — — — — — — — — 6a — — — — —
70: — — — — — — — —

The I2C device addresses for the LSM9DS1 seem to be correctly assigned to 0x1c and 0x6a, respectively. And I tried “i2cdump -y 1 0x6a” to check the register addresses for the accelerometer and the gyro and the output is:

No size specified (using byte-data access)
0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 68    ……………h
10: a0 00 44 b8 00 2d 00 03 8e ff 3d ff 0b 00 38 38    ?.D?.-.??.=.?.88
20: 38 80 00 00 00 00 00 07 cd ff 2e 00 f7 0f 00 00    8?…..??…??..
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    …………….
40: 74 51 a0 25 2a ab e4 40 80 c0 35 02 9b 7a 04 1f    tQ?%*??@??5??z??
50: 39 1b 48 81 82 80 89 a8 92 0d 42 c1 70 4e 08 bd    9?H???????B?pN??
60: 38 30 80 01 07 00 95 8b 92 21 a1 e1 88 47 24 20    80???.???!???G$
70: 61 71 00 00 80 68 68 07 02 03 01 00 00 40 c0 00    aq..?hh????..@?.
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    …………….
90: 00 00 00 80 00 00 02 60 a0 ff 2d ff 0c 00 00 00    …?..?`?.-.?…
a0: 00 00 00 00 00 00 00 00 cb ff 2d 00 f9 0f 00 00    ……..?.-.??..
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    …………….
c0: 00 00 00 00 02 3c 24 4c 1c 22 00 00 00 00 00 00    ….?<$L?”……
d0: 00 00 00 00 ff 01 00 00 00 00 00 00 00 00 00 00    …..?……….
e0: 07 00 00 00 07 00 00 00 00 10 00 00 00 00 00 00    ?…?….?……
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0    ……………?

The register addresses for the accelerometer output run from 0x28 through 0x2d, as described in the datasheet of the sensor. But the block read still fails to work correctly. Any comments?

Thanks,

Peter Lee