STRUCT FF_ENVELOPE

Section: Input Subsystem (9)
Updated: February 2011
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NAME

struct_ff_envelope - generic force-feedback effect envelope  

SYNOPSIS

struct ff_envelope {
  __u16 attack_length;
  __u16 attack_level;
  __u16 fade_length;
  __u16 fade_level;
};
 

MEMBERS

attack_length

duration of the attack (ms)

attack_level

level at the beginning of the attack

fade_length

duration of fade (ms)

fade_level

level at the end of fade
 

DESCRIPTION

The attack_level and fade_level are absolute values; when applying envelope force-feedback core will convert to positive/negative value based on polarity of the default level of the effect. Valid range for the attack and fade levels is 0x0000 - 0x7fff  

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