ESP32-S2有很多特殊功能的IO，通过查表得到了以下结论
| IO | TOUCH功能 | ADC | 内置 flash | 内置PSRAM | 功能 |
|---|---|---|---|---|---|
| GPIO0 | BOOT/Download模式切换 | ||||
| GPIO1 | TOUCH1 | ADC1_CH0 | |||
| GPIO2 | TOUCH2 | ADC1_CH1 | |||
| GPIO3 | TOUCH3 | ADC1_CH2 | |||
| GPIO4 | TOUCH4 | ADC1_CH3 | |||
| GPIO5 | TOUCH5 | ADC1_CH4 | |||
| GPIO6 | TOUCH6 | ADC1_CH5 | |||
| GPIO7 | TOUCH7 | ADC1_CH6 | |||
| GPIO8 | TOUCH8 | ADC1_CH7 | |||
| GPIO9 | TOUCH9 | ADC1_CH8 | |||
| GPIO10 | TOUCH10 | ADC1_CH9 | |||
| GPIO11 | TOUCH11 | ADC2_CH0 | |||
| GPIO12 | TOUCH12 | ADC2_CH1 | |||
| GPIO13 | TOUCH13 | ADC2_CH2 | |||
| GPIO14 | TOUCH14 | ADC2_CH3 | |||
| GPIO15 | ADC2_CH4 | ||||
| GPIO16 | ADC2_CH5 | ||||
| GPIO17 | ADC2_CH6 | DAC_1 | |||
| GPIO18 | ADC2_CH7 | DAC_2 | |||
| GPIO19 | ADC2_CH8 | USB_D- | |||
| GPIO20 | ADC2_CH9 | USB_D+ | |||
| GPIO21 | |||||
| GPIO26 | SPICS1 | 左边为内置 flash，右边为内置PSRAM | |||
| GPIO27 | SPIHD | SPIHD | |||
| GPIO28 | SPIWP | SPIWP | |||
| GPIO29 | SPICS0 | ||||
| GPIO30 | SPICLK | SPICLK | |||
| GPIO31 | SPIQ | SPIQ | |||
| GPIO32 | SPID | SPID | |||
| GPIO33 | FSPIHD | 可用的SPI2 | |||
| GPIO34 | FSPICS0 | CS | |||
| GPIO35 | FSPID | SPID/MOSI | |||
| GPIO36 | FSPICLK | SCK | |||
| GPIO37 | FSPIQ | SPIQ/MISO | |||
| GPIO38 | FSPIWP | ||||
| GPIO39 | MTCK | JTAG | |||
| GPIO40 | MTDO | ||||
| GPIO41 | MTDI | ||||
| GPIO42 | MTMS | ||||
| GPIO43 | TXD | 串口 | |||
| GPIO44 | RXD | ||||
| GPIO45 | GPIO45 VDD_SPI 电压选择 | ||||
| GPIO46 | GPIO46 系统启动是否打印 ROM Code |
另外，根据IDF的手册，ADC2和ESP32一样和WIFI复用了，所以可能读取操作会失败
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