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