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Bosch Sensortec | BMP388 Datasheet

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Modifications reserved |Data subject to change without notice | Printed in Germany

Document number: BST-BMP388-DS001-07 Revision_1.7_112020

3.6.4. FIFO overflow behavior

A FIFO overflow occurs if the FIFO is full and a new data is written to the FIFO. FIFO full means free space is less than

maximum frame length (9 bytes). In case of overflow the FIFO can either stop recording data or overwrite the oldest data.

The behavior is controlled by register fifo_stop_on_full.

•

Streaming mode, fifo_stop_on_full=’0’:

if the new frame does not fit inside the remaining free space in the FIFO RAM, FIFO will repeatedly delete the

oldest frame until it creates enough space for the new one.

•

FIFO stop-on-full mode, fifo_stop_on_full=’1’:

The newest frame is discarded. Normal operation resumes if the FIFO full condition no longer persists.

3.6.5. FIFO Frames

One data frame is composed of a header and a set of data organize as described in table below.

Table 11: Data frame composition

Bit

Header

fh_mode[1:0]

fh_param[3:0]

Data

Data bytes

The number of data bytes is defined by the header.

3.6.5.1. Header Format

Table 12: Header format

fh_mode[1:0]

Definition

fh_param[3:0]

Sensor frame

Sensor enable bits

Control frame: configuration

error

0001

Control frame: FIFO input

configuration change

0010

3.6.5.2. Sensor Frame Format

A sensor frame consists of a header and data bytes

Table 13: Sensor frame format

Bit

Header

Data

data bytes

Sensor data in frame is defined by s (time), t (temperature) and p (pressure) sensor enable bits:

•

If s=’1’, the frame corresponds to the sensor-time frame, in that case, t=p=’0’

•

If t=’1’ or/and p=’1’, the frame corresponds to a normal pressure or/and a temperature frame

•

If s=t=p=’0’, the frame corresponds to an empty frame

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