You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
1.4 KiB
71 lines
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)
|
|
|
|
|
|
|