SPI with LIS3DH Accelerometer is not working

[Zahme.1]

I am using a PIC32MX250F128B . I am trying to communicate with LIS3DH through SPI connection. I have several other devices like ADC, DAC working with SPI protocol perfectly fine. However the Accelerometer does not.

With the scope my CS, Clock and SDA matches the diagram from datasheet (its sending the correct address of WHO_AM_I register ) but SDO output remains silent. Cant see anything coming out of accelerometer.

I am trying to get the who_am_i register value but the output i am getting is zero.

I have attached a scoped picture of my SPI. I have tried rest of the 3 mode other than the mode mentioned in the datasheet.

Any suggestions or solution from the community would be much appreciated. I have gone through several posts with the same problem but with no solution.

I hope I can get one.

N.B: All my connections are perfectly fine and other SPI connections are also working fine (ADC, DAC). I've also purchased several breakout boards (Adafruit, seedstudio) but that does not work either.

Here in this picture

yellow line : CLK

Pink waveform : SDO

Cyan waveform: SDA

CS is working fine.

 

[niccolò]

Hi @Zahme.1​ ,

it seems to me that you are reading the wrong address.

judging by the picture, I see on SDA 0xAF (10101111) that is a read of register 2F, while you should be reading 0x0F for the WHO_AM_I.

can you check that?

also, can I ask you which Vdd and Vdd_IO levels are you using?

Niccolò

[ABouk.1]

Hi,

I also have this problem with my LIS3DH. CS is always driven low, MISO is pulled up and I receive 0xFF when I try to read WHO_AM_I register, been stuck on this bug for days now and i need your help.

The signals measured are SCK and MOSI, MISO is always 1.

[niccolò]

Hi @Community member​ ,

here you are reading 0x1F, that is not the WHO_AM_I register.

Can you try to modify the bytes you are sending?

also, it would be clearer to show every signal (MOSI MISO CLK CS) in the picture, if need further help.

Let me know if you manage to solve the issue

Niccolò

[ABouk.1]

Hi,

Thanks for your answer. I modified the bytes to be sent but still, I am not getting the value holded in WHO_AM_I register.

Here is my configuration :

CS : always low (tied to GND)

CLK : Yellow

MOSI : Pink

MISO : Blue

[CDuru.1]

I am posting as regards the main. I really don't understand wats wrong i have verified everything verifiable, the sensor still doesn't respond.

The hard ware connections are fine. please advise what to do

[niccolò]

Hi @CDuru.1​ ,

the communication seems fine, In my opionion it shoul be something regarding connections.

can you check that every pin is connected in the right way?

Niccolò

[CDuru.1]

I have double and also swapped in all possible permutations. just to give a brief overview I am now using the seed studio breakout board found in the link attached. connection's stated below. its the second breakout i have opted to use and same response all I get is 0xFF.

Please advise thanks.

LISbrkout pic32

CS -> CS

SCK -> SCK

SDO -> SDI

SDI -> SDO

[Ffdhb.1]

I additionally have this hassle with my LIS3DH. CS is constantly pushed low, MISO is pulled up and I obtain 0xFF when I attempt to study page WHO_AM_I register, been caught on this malicious program for days now and I want your help.

[niccolò]

Hi @Ffdhb.1​ ,

are you using the same setup as @Community member​ ?

Niccolò

[CDuru.1]

My setup is different but i am using the PIC32 though. maybe its a compatibility issue ?