Chapter 2. API Reference
TIMER_SRC_CLK_APB = 0
Select APB as the source clock
TIMER_SRC_CLK_XTAL = 1
Select XTAL as the source clock
2.2.4 GPIO & RTC GPIO
Overview
The ESP32-S2 chip features 43 physical GPIO pads. Some GPIO pads cannot be used or do not have the corre-
sponding pin on the chip package. For more details, see ESP32-S2 Technical Reference Manual > IO MUX and GPIO
Matrix (GPIO, IO_MUX) [PDF]. Each pad can be used as a general purpose I/O or can be connected to an internal
peripheral signal.
The table below provides more information on pin usage, and please note the comments in the table for GPIOs with
restrictions.
GPIO Analog Function RTC GPIO Comment
GPIO0 RTC_GPIO0 Strapping pin
GPIO1 ADC1_CH0 RTC_GPIO1
GPIO2 ADC1_CH1 RTC_GPIO2
GPIO3 ADC1_CH2 RTC_GPIO3
GPIO4 ADC1_CH3 RTC_GPIO4
GPIO5 ADC1_CH4 RTC_GPIO5
GPIO6 ADC1_CH5 RTC_GPIO6
GPIO7 ADC1_CH6 RTC_GPIO7
GPIO8 ADC1_CH7 RTC_GPIO8
GPIO9 ADC1_CH8 RTC_GPIO9
GPIO10 ADC1_CH9 RTC_GPIO10
GPIO11 ADC2_CH0 RTC_GPIO11
GPIO12 ADC2_CH1 RTC_GPIO12
GPIO13 ADC2_CH2 RTC_GPIO13
GPIO14 ADC2_CH3 RTC_GPIO14
GPIO15 ADC2_CH4 RTC_GPIO15
GPIO16 ADC2_CH5 RTC_GPIO16
GPIO17 ADC2_CH6 RTC_GPIO17
GPIO18 ADC2_CH7 RTC_GPIO18
GPIO19 ADC2_CH8 RTC_GPIO19
GPIO20 ADC2_CH9 RTC_GPIO20
GPIO21 RTC_GPIO21
GPIO26 SPI0/1
GPIO27 SPI0/1
GPIO28 SPI0/1
GPIO29 SPI0/1
GPIO30 SPI0/1
GPIO31 SPI0/1
GPIO32 SPI0/1
GPIO33
GPIO34
GPIO35
GPIO36
GPIO37
GPIO38
GPIO39 JTAG
GPIO40 JTAG
Continued on next page
Espressif Systems 249
Submit Document Feedback
Release v4.4
To Next Page
Loading...
Need help?
General