1STRUCT FF_PERIODIC_E(9)         Input Subsystem        STRUCT FF_PERIODIC_E(9)
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NAME

6       struct_ff_periodic_effect - defines parameters of a periodic
7       force-feedback effect
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SYNOPSIS

10       struct ff_periodic_effect {
11         __u16 waveform;
12         __u16 period;
13         __s16 magnitude;
14         __s16 offset;
15         __u16 phase;
16         struct ff_envelope envelope;
17         __u32 custom_len;
18         __s16 * custom_data;
19       };
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MEMBERS

22       waveform
23           kind of the effect (wave)
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25       period
26           period of the wave (ms)
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28       magnitude
29           peak value
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31       offset
32           mean value of the wave (roughly)
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34       phase
35           ´horizontal´ shift
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37       envelope
38           envelope data
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40       custom_len
41           number of samples (FF_CUSTOM only)
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43       custom_data
44           buffer of samples (FF_CUSTOM only)
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DESCRIPTION

47       Known waveforms - FF_SQUARE, FF_TRIANGLE, FF_SINE, FF_SAW_UP,
48       FF_SAW_DOWN, FF_CUSTOM. The exact syntax FF_CUSTOM is undefined for the
49       time being as no driver supports it yet.
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NOTE

52       the data pointed by custom_data is copied by the driver. You can
53       therefore dispose of the memory after the upload/update.
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56Kernel Hackers Manual 2.6.         June 2019           STRUCT FF_PERIODIC_E(9)
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