| DK45686 eMD examples User Guide 2.1.0 Documentation of the DK45686 eMD examples

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adv_fifo_compression

This application demonstrates how to retrieve data from the FIFO while using FIFO compression.

It enables accel and/or gyro in Low-Noise mode at 50 Hz and enables/disable compression upon user request through UART.

FIFO compression is enabled by default, with an interrupt threshold of 16 packets and a non-compressed frame every 8 frames.

# Command interface

This application allows the following command to be sent through UART:

- `a`: to enable/disable accelerometer (defaults to enable).
- `g`: to enable/disable gyroscope (defaults to enable).
- `f`: to enable/disable FIFO compression (defaults to disable).
- `c`: to print current configuration.
- `h`: to print help screen.

# Terminal output

## Data format

Data are printed on the terminal as follow:

SI <timestamp> us FIFO count <fifo_count> Sample count <sample_count>
SI <timestamp> us Average Accel: <acc_x> <acc_y> <acc_z> g Average Gyro: <gyr_x> <gyr_y> <gyr_z> dps Average Temp: <temp> degC

With:

- `<timestamp>`: Time in microsecond read from MCU clock when latest INT1 was fired.
- `<fifo_count>`: Packet count read from FIFO, should be always 16 considering FIFO watermark configuration.
- `<sample_count>`: Total count of samples once uncompression of `<fifo_count>` packets is done, will be 16 if FIFO compression is disabled.
- `<acc_x|y|z>`: Average raw accel value of all `<sample_count>` samples converted in g.
- `<gyr_x|y|z>`: Average raw gyroscope value of all `<sample_count>` samples converted in dps.
- `<temp>`: Average raw temp value of all `<sample_count>` samples converted in °C

## Example of output

[I] ###
[I] ### Example FIFO Compression (using advanced API)
[I] ###
[I] SI 444817 us FIFO count 16 Sample count 23
[I] SI 444817 us Average Accel: -0.04 0.01 1.01 g Average Gyro: -0.86 5.72 0.21 dps Average Temp: 24.37 degC
[I] SI 1637743 us FIFO count 16 Sample count 60
[I] SI 1637743 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.97 0.03 0.08 dps Average Temp: 24.47 degC
[I] SI 2592083 us FIFO count 16 Sample count 48
[I] SI 2592083 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.98 0.01 0.09 dps Average Temp: 24.37 degC
[I] SI 3745245 us FIFO count 16 Sample count 58
[I] SI 3745245 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.97 0.01 0.08 dps Average Temp: 24.44 degC
[I] SI 4898406 us FIFO count 16 Sample count 58
[I] SI 4898406 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.98 0.01 0.07 dps Average Temp: 24.41 degC
[I] SI 5972039 us FIFO count 16 Sample count 54
[I] SI 5972039 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.97 0.02 0.07 dps Average Temp: 24.41 degC
[I] SI 7125200 us FIFO count 16 Sample count 58
[I] SI 7125200 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.98 0.01 0.07 dps Average Temp: 24.43 degC
[I] SI 8198833 us FIFO count 16 Sample count 54
[I] SI 8198833 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.97 0.01 0.08 dps Average Temp: 24.42 degC
[I] SI 9351994 us FIFO count 16 Sample count 58
[I] SI 9351994 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.97 0.01 0.07 dps Average Temp: 24.41 degC
[I] SI 10505156 us FIFO count 16 Sample count 58
[I] SI 10505156 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.98 0.01 0.07 dps Average Temp: 24.46 degC
[I] SI 11717964 us FIFO count 16 Sample count 61
[I] SI 11717964 us Average Accel: -0.05 0.00 1.01 g Average Gyro: -0.98 0.01 0.07 dps Average Temp: 24.45 degC