| STRUCT FF_PERIODIC_E(9) | Input Subsystem | STRUCT FF_PERIODIC_E(9) |
NAME¶
struct_ff_periodic_effect - defines parameters of a periodic force-feedback effect
SYNOPSIS¶
struct ff_periodic_effect {
__u16 waveform;
__u16 period;
__s16 magnitude;
__s16 offset;
__u16 phase;
struct ff_envelope envelope;
__u32 custom_len;
__s16 * custom_data;
};
MEMBERS¶
waveform
kind of the effect (wave)
period
period of the wave (ms)
magnitude
peak value
offset
mean value of the wave (roughly)
phase
´horizontal´ shift
envelope
envelope data
custom_len
number of samples (FF_CUSTOM only)
custom_data
buffer of samples (FF_CUSTOM only)
DESCRIPTION¶
Known waveforms - FF_SQUARE, FF_TRIANGLE, FF_SINE, FF_SAW_UP, FF_SAW_DOWN, FF_CUSTOM. The exact syntax FF_CUSTOM is undefined for the time being as no driver supports it yet.
NOTE¶
the data pointed by custom_data is copied by the driver. You can therefore dispose of the memory after the upload/update.
COPYRIGHT¶
| April 2023 | Kernel Hackers Manual 2.6. |