Chapter 2. API Reference
TOUCH_PAD_DENOISE_CAP_L3 = 3
Denoise channel internal reference capacitance is 9.2pf
TOUCH_PAD_DENOISE_CAP_L4 = 4
Denoise channel internal reference capacitance is 10.6pf
TOUCH_PAD_DENOISE_CAP_L5 = 5
Denoise channel internal reference capacitance is 12.0pf
TOUCH_PAD_DENOISE_CAP_L6 = 6
Denoise channel internal reference capacitance is 13.4pf
TOUCH_PAD_DENOISE_CAP_L7 = 7
Denoise channel internal reference capacitance is 14.8pf
TOUCH_PAD_DENOISE_CAP_MAX = 8
enum touch_pad_shield_driver_t
Touch sensor shield channel drive capability level
Values:
TOUCH_PAD_SHIELD_DRV_L0 = 0
The max equivalent capacitance in shield channel is 40pf
TOUCH_PAD_SHIELD_DRV_L1
The max equivalent capacitance in shield channel is 80pf
TOUCH_PAD_SHIELD_DRV_L2
The max equivalent capacitance in shield channel is 120pf
TOUCH_PAD_SHIELD_DRV_L3
The max equivalent capacitance in shield channel is 160pf
TOUCH_PAD_SHIELD_DRV_L4
The max equivalent capacitance in shield channel is 200pf
TOUCH_PAD_SHIELD_DRV_L5
The max equivalent capacitance in shield channel is 240pf
TOUCH_PAD_SHIELD_DRV_L6
The max equivalent capacitance in shield channel is 280pf
TOUCH_PAD_SHIELD_DRV_L7
The max equivalent capacitance in shield channel is 320pf
TOUCH_PAD_SHIELD_DRV_MAX
enum touch_pad_conn_type_t
Touch channel idle state configuration
Values:
TOUCH_PAD_CONN_HIGHZ = 0
Idle status of touch channel is high resistance state
TOUCH_PAD_CONN_GND = 1
Idle status of touch channel is ground connection
TOUCH_PAD_CONN_MAX
enum touch_filter_mode_t
Touch channel IIR filter coefficient configuration.
Note On ESP32S2. There is an error in the IIR calculation. The magnitude of the error is twice the filter
coefficient. So please select a smaller filter coefficient on the basis of meeting the filtering requirements.
Recommended filter coefficient selection IIR_16.
Values:
Espressif Systems 417
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