1.4 KiB
TOUCH
Access to the hardware touch sensing controller. Can be used to create capacitive touch interfaces or for rough capacitance measurement (e.g. water level in a bottle, or proximity sensing).
Button mode is implemented for simple threshold checking with hystheresis.
Commands
READ (0)
Read the raw touch pad values (lower indicates higher capacitance). Values are ordered by group and channel.
Response:
- u16[] - values
SET_BIN_THR (1)
Set button mode thresholds. Value 0 = button mode disabled fro the pad.
Request:
- u16[] - thresholds
DISABLE_ALL_REPORTS (2)
Set thresholds to 0, disabling the button mode for all pads.
SET_DEBOUNCE_TIME (3)
Set debounce time for the button mode (replaces the value from unit settings)
Request:
- u16 - debounce time milliseconds
SET_HYSTERESIS (4)
Set hysteresis (replaces the default value from settings)
Hysteresis is added to the threshold value for the switch-off level (switch-off happens when the measured value is exceeded - capacitance of the pad drops)
Request:
- u16 - hystheresis
GET_CH_COUNT (10)
Get the number of enabled channels
Response:
- u8 - channel count
Events
BUTTON_CHANGE (0x00)
The binary state of some of the capacitive pads with button mode enabled changed.
Payload:
- u32 - binary state of all channels (packed)
- u32 - changed / trigger-generating channels (packed)