LIS2DH12 is always returning only 0x80,0x40,0xC0 values in receive buffer of spi

Neha Tawale · ‎2018-01-10

Posted on January 10, 2018 at 10:32

I am trying to interface LIS2DH12 with NRF51822 chip using SPI communication no matter in what way i configure my spi, it is always returning fixed values 0x80,0x40,0xc0 in all six registers for x,y,z co-ordinate.

I am not using FIFO but trying directly to read from register is it right way or should i choose FIFO mode.

thanks in advance.

Miroslav BATEK · ‎2018-01-10

Posted on January 10, 2018 at 10:48

To check your SPI communication first try to read who_am_i (0x0F) register, if it works then try to write a value to a register and read it back.

If this works, please share you sensor configuration and I can check it.

Neha Tawale · ‎2018-01-10

Posted on January 10, 2018 at 11:00

Thanks for your attention and I am able to read value 0x33 from WHO_M_I register as well as able to write and read from any register.

This are my MEMS configuration function:

void MCAL_MEMS_Init()

{

int i;

/* MEMS Configuration Register */

LIS2DH12_Write( LIS2DH12_REG_CTRL_REG1,0x77);

for(i=0;i<100;i++);

LIS2DH12_Write( LIS2DH12_REG_CTRL_REG2,0x00);

for(i=0;i<100;i++);

LIS2DH12_Write( LIS2DH12_REG_CTRL_REG4,0x00);

for(i=0;i<100;i++);

LIS2DH12_Write( LIS2DH12_REG_CTRL_REG5,0x00);

for(i=0;i<100;i++);

LIS2DH12_Write( FIFO_CTRL_REG ,0x00);

for(i=0;i<100;i++);

LIS2DH12_Write( TEMP_CFG_REG ,0x00);

for(i=0;i<100;i++);

LIS2DH12_Write( INT1_CFG ,0x00);

for(i=0;i<100;i++);

}

Please suggest me if i am doing anything wrong in configuring MEMS registers.

Miroslav BATEK · ‎2018-01-10

Posted on January 10, 2018 at 11:26

You configuration is correct, only set the CTRL_REG1 is enough to make the sensor work, other registers are in default value.

Are you sure you you are reading the correct output registers. You wrote that you read 3 values (0x80, 0x40, 0xC0) in all six registers, it doesn't make much sense. What are the values in all six registers? Are they stable?

Neha Tawale · ‎2018-01-10

Posted on January 11, 2018 at 04:45

Thanks for your attention again and for testing purpose if i check only one register suppose OUT_X_L or any other it will return those values(0x80,0x40,0xc0) which is not right i guess, i am suppose to get variable and not fix values in these registers on movement of the sensor.

What could be the possible reason if u can tell.

Miroslav BATEK · ‎2018-01-11

Posted on January 11, 2018 at 09:20

Unfortunately, your explanation is not clear. I think, the sensors works, you only misinterpret the results.

Please read all six output registers (during movement or in different sensor position) and share the values, I can then check it.

olin00 · ‎2023-09-16

I had the same issue using I2C - the XYZ values received by reading 6 bytes in one go were as Neha Tawale described. In my case the solution was to enable automatic incrementation of the address register by adding 0x80 to the address value.