DA7281-00FVC datasheet(42/76 Pages) DIALOG

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DA7281

LRA/ERM Haptic Driver with Multiple I²C Addresses,

Integrated Waveform Memory, and Wideband Support

Datasheet

Revision 3.0

30-Jul-2019

CFR0011-120-00

42 of 76

5.8

Waveform Memory

The Waveform Memory stores haptic drive sequences. A single haptic effect is called a sequence

and each sequence is formed by one or more frames that address one or more snippets stored in

memory. The overall Waveform Memory structure is described in detail in Section 5.8.1;

Sections 5.8.2 to 5.8.4 provide definitions for snippets, frames, and sequences.

NOTE

It is recommended that the Dialog SmartCanvas GUI is used to construct sequences and upload them to the

Waveform Memory. The easy to use GUI provides intuitive visualization of the sequences in the Waveform

Memory and requires only basic knowledge of the overall memory format.

5.8.1

Waveform Memory Structure

The waveform memory structure has a 100-byte capacity for storing snippets, frames, and

sequences. Sequences reference the snippets using frames to allow complex haptic sequences to

be created in a memory efficient manner. The overall structure of the Waveform Memory can be

seen in Figure 24. For Waveform Memory programming, see Section 5.6.4.

num_of_snippets[7:0]

num_of_sequences[7:0]

snippet_1_endpointer

snippet_n_endpointer

sequence_0_endpointer

snippet_n

sequence_0

sequence_n

sequence_n_endpointer

snippet_1

snippet_1_endpointer

WAVEFORM MEMORY

100 Bytes

Byte 0

Byte 1

Byte 2

Byte n

PWL_point_ 0

PWL_point_n

frame_0

frame_n

Figure 24: Waveform Memory Structure

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