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LIS3DH Wrong data



im having some issues with lis3dh data. 

So im trying to configure and read data from sensor, but its invalid. When i read my buffer L values that are 0 2 4 they seem right: 


But when i try to connect the data or even read 1 3 5 value that are H, its starting sending some values that are 100% incorrect. Im not moving sensor in any direction. 


These are H value. When i connect them. 
x = buffer[0];
x |= ((uint16_t)buffer[1]) << 8;
y = buffer[2];
y |= ((uint16_t)buffer[3]) << 8;
z = buffer[4];
z |= ((uint16_t)buffer[5]) << 8;
doing sth like this the values jump from 32k/16k and 0. 
I have no idea what's going on. Im just sending adress to X_L with setting 1 MSB for auto increment. 
Ofc, ive configured sensor CTRL_REG to turn on normal mode 100Hz XYZ axis ON and 2g. 

And i have some question about FIFO too. I've seen some examples from github. To be precise: lis3dh_multi_read_fifo.c
And ive set it up for my board. Same configuration, functions etc. And i still get wrong data when im connecting H and L. But there is 1 thing that is interesting too me, what's the purpose of using FIFO, when im actually just reading data 25 times 

if (flags) {
/* Read number of sample in FIFO */
lis3dh_fifo_data_level_get(&dev_ctx, &num);

while (num-- > 0) {
/* Read XL samples */
lis3dh_acceleration_raw_get(&dev_ctx, data_raw_acceleration);
acceleration_mg[0] =
acceleration_mg[1] =
acceleration_mg[2] =
sprintf((char *)tx_buffer,
"Acceleration [mg]:%4.2f\t%4.2f\t%4.2f\r\n",
acceleration_mg[0], acceleration_mg[1], acceleration_mg[2]);
tx_com(tx_buffer, strlen((char const *)tx_buffer));


what's the purpose of Fifo when i can just read data 25 times, is it more energy efficient in this example? 



Federica Bossi
ST Employee

Hi @HubertW ,

Welcome to ST Community!

You can try to follow our PID examples on github.

Let me know if you still have the problem or if they were helpful.

In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.