LIS3DH Wrong data
Hello,
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] =
lis3dh_from_fs2_hr_to_mg(data_raw_acceleration[0]);
acceleration_mg[1] =
lis3dh_from_fs2_hr_to_mg(data_raw_acceleration[1]);
acceleration_mg[2] =
lis3dh_from_fs2_hr_to_mg(data_raw_acceleration[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?