Pin Definition:
3.3V: power supply
GPIO0: RTC_ GPIOO
GPIO1: RTC_ GPIO1, TOUCH1, ADC1 -CHO
GPIO2: RTC_ GPIO2, GPIO2, TOUCH2, ADC1 _CH1
GPIO3: RTC_ GPIO3, GPIO3, TOUCH3, ADC1 CH2
GPIO4: RTC_ GPIO4, TOUCH4, ADC1_CH3
GPIO5: RTC_ GPIO5, TOUCH5, ADC1 CH4
GPIO6: RTC_ GPIO6, TOUCH6, ADC1_ CH5
GPIO7: RTC_ GPIO7, TOUCH7, ADC1 CH6
GPIO8: RTC GPIO8, TOUCH8, ADC1 CH7
GPIO9: RTC_ GPIO9, TOUCH9, ADC1_ _cH8, FSPIHD
GPIO10: RTC GPIO10, TOUCH10, ADC1 _CH9, FSPICSO, FSPIIO4
GPIO11: RTC_ GPIO11. TOUCH11, ADC2. _cH0, FSPID, FSPIIO5
GPIO12: RTC_ GPIO12, TOUCH12, ADC2 CH1, FSPICLK, FSPIIO6
GPIO13: RTC _GPIO13, TOUCH13, ADC2 CH2, FSPIQ, FSPIIO7GPIO14: RTC_
GPIO14:TOUCH14, ADC2 _cH3, FSPIWP, FSPIDQSGPIO15: RTC GPIO15, UORTS, ADC2 cH4, XTAL _32K P
GPIO16: RTC GPIO16, U0CTS, ADC2_ CH5, XTAL_ 32K N
GPIO17: RTC GPIO17, U1TXD, ADC2_ CH6, DAC _1
GPIO18: RTC_ GPIO18, U1RXD, ADC2_ CH7, DAC 2, CLK_ OUT3
5V: power supply
GND: Ground
GPIO19: RTC GPIO19, U1RTS, ADC2 CH8, CLK OUT2, USB _D-
GPIO20: RTC GPIO20,U1CTS, ADC2 _CH9, CLK OUT1,USB _D+
GPIO21: RTC_ GPIO21,
GPIO26: SPICS1
GPIO33: SPIIO4, FSPIHD
GPIO34: SPIIO5, FSPICSO
GPIO35: SPIIO6, FSPID
GPIO36: SPIIO7, FSPICLK
GPIO37: SPIDQS, FSPIQ
GPIO38: FSPIWP
GPIO39:MTCK, CLK_ OUT3
GPIO40: MTDO, CLK_ OUT2
GPIO41: MTDI, CLK_ _OUT1
GPIO42: MTMS
GPIO43/TX: U0TXD, CLK_ OUT1
GPIO44/RX: U0RXD, CLK_ OUT2
GPIO45
GPIO46
EN: high level: chip enable; low level: chip off (pulled high by default)
GND: Ground