Espressif ESP32-S2 Programming Manual page 425

Chapter 2. API Reference
TOUCH_PAD_NUM9
Touch pad channel 9 is GPIO32(ESP32) / GPIO9(ESP32-S2)
TOUCH_PAD_NUM10
Touch channel 10 is GPIO10(ESP32-S2)
TOUCH_PAD_NUM11
Touch channel 11 is GPIO11(ESP32-S2)
TOUCH_PAD_NUM12
Touch channel 12 is GPIO12(ESP32-S2)
TOUCH_PAD_NUM13
Touch channel 13 is GPIO13(ESP32-S2)
TOUCH_PAD_NUM14
Touch channel 14 is GPIO14(ESP32-S2)
TOUCH_PAD_MAX
enum touch_high_volt_t
Touch sensor high reference voltage
Values:
TOUCH_HVOLT_KEEP = -1
Touch sensor high reference voltage, no change
TOUCH_HVOLT_2V4 = 0
Touch sensor high reference voltage, 2.4V
TOUCH_HVOLT_2V5
Touch sensor high reference voltage, 2.5V
TOUCH_HVOLT_2V6
Touch sensor high reference voltage, 2.6V
TOUCH_HVOLT_2V7
Touch sensor high reference voltage, 2.7V
TOUCH_HVOLT_MAX
enum touch_low_volt_t
Touch sensor low reference voltage
Values:
TOUCH_LVOLT_KEEP = -1
Touch sensor low reference voltage, no change
TOUCH_LVOLT_0V5 = 0
Touch sensor low reference voltage, 0.5V
TOUCH_LVOLT_0V6
Touch sensor low reference voltage, 0.6V
TOUCH_LVOLT_0V7
Touch sensor low reference voltage, 0.7V
TOUCH_LVOLT_0V8
Touch sensor low reference voltage, 0.8V
TOUCH_LVOLT_MAX
enum touch_volt_atten_t
Touch sensor high reference voltage attenuation
Values:
TOUCH_HVOLT_ATTEN_KEEP = -1
Touch sensor high reference voltage attenuation, no change
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