====== Using GPIOs in Arduino with flipper board ======
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tags: flipper, Arduino, GPIO
If you need to use a flipper GPIO in Arduino, you need to find the arduino name of the GPIO :
To do so, use following table and check for the arduino name of the GPIO you want to use.\\
The GPIOs are described in the following spreadsheet file: {{ :products:flipper:gpio_flipper.xlsx |}}
{| border="1" width="86" cellspacing="0"
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| colspan="7" align="center" valign="middle" bgcolor="#FFFF00" height="17"|Header 1 (J402)
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| align="center" valign="bottom" bgcolor="#729FCF" height="17"|expander pin
| align="center" valign="bottom" bgcolor="#729FCF"|port
| align="center" valign="bottom" bgcolor="#729FCF"|pin
| align="center" valign="bottom" bgcolor="#729FCF"|identifier
| align="center" valign="bottom" bgcolor="#729FCF"|rôle
| align="center" valign="bottom" bgcolor="#729FCF"|name in arduino
| align="center" valign="bottom" bgcolor="#729FCF"|PinMap Pos
|-
| align="center" valign="bottom" height="17"|1
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|VIN
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|2
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|GND
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|3
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|VCC
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|4
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|BRD_EN
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|5
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|VCC_SW_EN
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|6
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|3V3_SW_EN
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|7
| align="center" valign="bottom"|0
| align="center" valign="bottom"|11
| align="center" valign="bottom"|11
| align="center" valign="bottom"|I2C0_SDA
| align="center" valign="bottom"|PIN_WIRE_SDA
| align="center" valign="bottom"|0
|-
| align="center" valign="bottom" height="17"|8
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|3V3
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|9
| align="center" valign="bottom"|0
| align="center" valign="bottom"|8
| align="center" valign="bottom"|8
| align="center" valign="bottom"|I2C0_SCL
| align="center" valign="bottom"|PIN_WIRE_SCL
| align="center" valign="bottom"|1
|-
| align="center" valign="bottom" height="17"|10
| align="center" valign="bottom"|1
| align="center" valign="bottom"|8
| align="center" valign="bottom"|40
| align="center" valign="bottom"|SPI0_MISO
| align="center" valign="bottom"|PIN_SPI_MISO
| align="center" valign="bottom"|2
|-
| align="center" valign="bottom" height="17"|11
| align="center" valign="bottom"|0
| align="center" valign="bottom"|6
| align="center" valign="bottom"|6
| align="center" valign="bottom"|SPI0_MOSI
| align="center" valign="bottom"|PIN_SPI_MOSI
| align="center" valign="bottom"|3
|-
| align="center" valign="bottom" height="17"|12
| align="center" valign="bottom"|0
| align="center" valign="bottom"|25
| align="center" valign="bottom"|25
| align="center" valign="bottom"|SPIO_CS1
| align="center" valign="bottom"|SS2
| align="center" valign="bottom"|4
|-
| align="center" valign="bottom" height="17"|13
| align="center" valign="bottom"|0
| align="center" valign="bottom"|4
| align="center" valign="bottom"|4
| align="center" valign="bottom"|SPIO_SCLK
| align="center" valign="bottom"|PIN_SPI_SCK
| align="center" valign="bottom"|5
|-
| align="center" valign="bottom" height="17"|14
| align="center" valign="bottom"|0
| align="center" valign="bottom"|14
| align="center" valign="bottom"|14
| align="center" valign="bottom"|UART1_TX
| align="center" valign="bottom"|PIN_SERIAL2_TX
| align="center" valign="bottom"|6
|-
| align="center" valign="bottom" height="17"|15
| align="center" valign="bottom"|0
| align="center" valign="bottom"|16
| align="center" valign="bottom"|16
| align="center" valign="bottom"|UART1_RX
| align="center" valign="bottom"|PIN_SERIAL2_TX
| align="center" valign="bottom"|7
|-
| align="center" valign="bottom" height="17"|16
| align="center" valign="bottom"|0
| align="center" valign="bottom"|13
| align="center" valign="bottom"|13
| align="center" valign="bottom"|UART0_TX
| align="center" valign="bottom"|PIN_SERIAL1_TX
| align="center" valign="bottom"|8
|-
| align="center" valign="bottom" height="17"|17
| align="center" valign="bottom"|0
| align="center" valign="bottom"|15
| align="center" valign="bottom"|15
| align="center" valign="bottom"|UART0_RX
| align="center" valign="bottom"|PIN_SERIAL1_RX
| align="center" valign="bottom"|9
|-
| align="center" valign="bottom" height="17"|18
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|EXT_RST
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|19
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|GND
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|20
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|VUSB
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| colspan="7" align="center" valign="middle" bgcolor="#FFFF00" height="17"|Header 2 (J401)
|-
| align="center" valign="bottom" bgcolor="#729FCF" height="17"|expander pin
| align="center" valign="bottom" bgcolor="#729FCF"|port
| align="center" valign="bottom" bgcolor="#729FCF"|pin
| align="center" valign="bottom" bgcolor="#729FCF"|identifier
| align="center" valign="bottom" bgcolor="#729FCF"|rôle
| align="center" valign="bottom" bgcolor="#729FCF"|
| align="center" valign="bottom" bgcolor="#729FCF"|PinMap Pos
|-
| align="center" valign="bottom" height="17"|21
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|VBAT
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|22
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|GND
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|23
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|VDD_SW_EN
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|24
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|3V3_SW_EN
| align="center" valign="bottom" bgcolor="#FF0000"|
| align="center" valign="bottom" bgcolor="#FF0000"|
|-
| align="center" valign="bottom" height="17"|25
| align="center" valign="bottom"|1
| align="center" valign="bottom"|1
| align="center" valign="bottom"|33
| align="center" valign="bottom"|user_defined
| align="center" valign="bottom"|EXP_25
| align="center" valign="bottom"|10
|-
| align="center" valign="bottom" height="17"|26
| align="center" valign="bottom"|0
| align="center" valign="bottom"|12
| align="center" valign="bottom"|12
| align="center" valign="bottom"|I2C1_SDA
| align="center" valign="bottom"|PIN_WIRE1_SDA
| align="center" valign="bottom"|11
|-
| align="center" valign="bottom" height="17"|27
| align="center" valign="bottom"|1
| align="center" valign="bottom"|11
| align="center" valign="bottom"|43
| align="center" valign="bottom"|user_defined
| align="center" valign="bottom"|EXP_27
| align="center" valign="bottom"|12
|-
| align="center" valign="bottom" height="17"|28
| align="center" valign="bottom"|1
| align="center" valign="bottom"|9
| align="center" valign="bottom"|41
| align="center" valign="bottom"|I2C1_SCL
| align="center" valign="bottom"|PIN_WIRE1_SCL
| align="center" valign="bottom"|13
|-
| align="center" valign="bottom" height="17"|29
| align="center" valign="bottom"|0
| align="center" valign="bottom"|30
| align="center" valign="bottom"|30
| align="center" valign="bottom"|user_defined/AIN6
| align="center" valign="bottom"|EXP_29
| align="center" valign="bottom"|14
|-
| align="center" valign="bottom" height="17"|30
| align="center" valign="bottom"|1
| align="center" valign="bottom"|13
| align="center" valign="bottom"|45
| align="center" valign="bottom"|user_defined
| align="center" valign="bottom"|EXP_30
| align="center" valign="bottom"|15
|-
| align="center" valign="bottom" height="17"|31
| align="center" valign="bottom"|0
| align="center" valign="bottom"|2
| align="center" valign="bottom"|2
| align="center" valign="bottom"|user_defined/AIN0
| align="center" valign="bottom"|EXP_31
| align="center" valign="bottom"|16
|-
| align="center" valign="bottom" height="17"|32
| align="center" valign="bottom"|0
| align="center" valign="bottom"|28
| align="center" valign="bottom"|28
| align="center" valign="bottom"|user_defined/AIN7
| align="center" valign="bottom"|EXP_32
| align="center" valign="bottom"|17
|-
| align="center" valign="bottom" height="17"|33
| align="center" valign="bottom"|1
| align="center" valign="bottom"|10
| align="center" valign="bottom"|42
| align="center" valign="bottom"|LED_BLUE
| align="center" valign="bottom"|LED_BLUE
| align="center" valign="bottom"|18
|-
| align="center" valign="bottom" height="17"|34
| align="center" valign="bottom"|0
| align="center" valign="bottom"|29
| align="center" valign="bottom"|29
| align="center" valign="bottom"|user_defined/AIN5
| align="center" valign="bottom"|EXP_34
| align="center" valign="bottom"|19
|-
| align="center" valign="bottom" height="17"|35
| align="center" valign="bottom"|1
| align="center" valign="bottom"|7
| align="center" valign="bottom"|39
| align="center" valign="bottom"|LED_GREEN
| align="center" valign="bottom"|LED_GREEN
| align="center" valign="bottom"|20
|-
| align="center" valign="bottom" height="17"|36
| align="center" valign="bottom"|0
| align="center" valign="bottom"|3
| align="center" valign="bottom"|3
| align="center" valign="bottom"|user_defined/EN_EXP
| align="center" valign="bottom"|EXP_36
| align="center" valign="bottom"|21
|-
| align="center" valign="bottom" height="17"|37
| align="center" valign="bottom"|1
| align="center" valign="bottom"|5
| align="center" valign="bottom"|37
| align="center" valign="bottom"|LED_RED
| align="center" valign="bottom"|LED_RED
| align="center" valign="bottom"|22
|-
| align="center" valign="bottom" height="17"|38
| align="center" valign="bottom"|1
| align="center" valign="bottom"|6
| align="center" valign="bottom"|38
| align="center" valign="bottom"|USER_BTN
| align="center" valign="bottom"|PIN_BUTTON1
| align="center" valign="bottom"|23
|-
| align="center" valign="bottom" height="17"|39
| align="center" valign="bottom"|0
| align="center" valign="bottom"|9
| align="center" valign="bottom"|9
| align="center" valign="bottom"|user_defined
| align="center" valign="bottom"|EXP_39
| align="center" valign="bottom"|24
|-
| align="center" valign="bottom" height="17"|40
| align="center" valign="bottom"|0
| align="center" valign="bottom"|10
| align="center" valign="bottom"|10
| align="center" valign="bottom"|user_defined
| align="center" valign="bottom"|EXP_40
| align="center" valign="bottom"|25
|-
| colspan="7" align="center" valign="middle" bgcolor="#FFFF00" height="17"|On Board QSPI FLASH
|-
| align="center" valign="bottom" bgcolor="#729FCF" height="17"|QSPI pin
| align="center" valign="bottom" bgcolor="#729FCF"|port
| align="center" valign="bottom" bgcolor="#729FCF"|pin
| align="center" valign="bottom" bgcolor="#729FCF"|identifier
| align="center" valign="bottom" bgcolor="#729FCF"|rôle
| align="center" valign="bottom" bgcolor="#729FCF"|
| align="center" valign="bottom" bgcolor="#729FCF"|PinMap Pos
|-
| align="center" valign="bottom" height="17"|6
| align="center" valign="bottom"|0
| align="center" valign="bottom"|19
| align="center" valign="bottom"|19
| align="center" valign="bottom"|FLASH_CLK
| align="center" valign="bottom"|PIN_QSPI_SCK
| align="center" valign="bottom"|26
|-
| align="center" valign="bottom" height="17"|1
| align="center" valign="bottom"|0
| align="center" valign="bottom"|17
| align="center" valign="bottom"|17
| align="center" valign="bottom"|FLASH_CS
| align="center" valign="bottom"|PIN_QSPI_CS
| align="center" valign="bottom"|27
|-
| align="center" valign="bottom" height="17"|5
| align="center" valign="bottom"|0
| align="center" valign="bottom"|20
| align="center" valign="bottom"|20
| align="center" valign="bottom"|FLASH_IO0/FLASH_MOSI
| align="center" valign="bottom"|PIN_QSPI_IO0
| align="center" valign="bottom"|28
|-
| align="center" valign="bottom" height="17"|2
| align="center" valign="bottom"|0
| align="center" valign="bottom"|21
| align="center" valign="bottom"|21
| align="center" valign="bottom"|FLASH_IO1/FLASH_MISO
| align="center" valign="bottom"|PIN_QSPI_IO1
| align="center" valign="bottom"|29
|-
| align="center" valign="bottom" height="17"|3
| align="center" valign="bottom"|0
| align="center" valign="bottom"|22
| align="center" valign="bottom"|22
| align="center" valign="bottom"|FLASH_IO2
| align="center" valign="bottom"|PIN_QSPI_IO2
| align="center" valign="bottom"|30
|-
| align="center" valign="bottom" height="17"|7
| align="center" valign="bottom"|0
| align="center" valign="bottom"|23
| align="center" valign="bottom"|23
| align="center" valign="bottom"|FLASH_IO3
| align="center" valign="bottom"|PIN_QSPI_IO3
| align="center" valign="bottom"|31
|-
| colspan="7" align="center" valign="middle" bgcolor="#FFFF00" height="17"|On Board SD CARD READER
|-
| align="center" valign="bottom" bgcolor="#729FCF" height="17"|SD pin
| align="center" valign="bottom" bgcolor="#729FCF"|port
| align="center" valign="bottom" bgcolor="#729FCF"|pin
| align="center" valign="bottom" bgcolor="#729FCF"|identifier
| align="center" valign="bottom" bgcolor="#729FCF"|rôle
| align="center" valign="bottom" bgcolor="#729FCF"|
| align="center" valign="bottom" bgcolor="#729FCF"|PinMap Pos
|-
| align="center" valign="bottom" height="17"|5
| align="center" valign="bottom"|0
| align="center" valign="bottom"|7
| align="center" valign="bottom"|7
| align="center" valign="bottom"|SD_SPI_SCLK
| align="center" valign="bottom"|PIN_SPI1_SCK
| align="center" valign="bottom"|32
|-
| align="center" valign="bottom" height="17"|2
| align="center" valign="bottom"|0
| align="center" valign="bottom"|5
| align="center" valign="bottom"|5
| align="center" valign="bottom"|SD_SPI_CS
| align="center" valign="bottom"|SS1
| align="center" valign="bottom"|33
|-
| align="center" valign="bottom" height="17"|3
| align="center" valign="bottom"|0
| align="center" valign="bottom"|27
| align="center" valign="bottom"|27
| align="center" valign="bottom"|SD_SPI_MOSI
| align="center" valign="bottom"|PIN_SPI1_MOSI
| align="center" valign="bottom"|34
|-
| align="center" valign="bottom" height="17"|7
| align="center" valign="bottom"|0
| align="center" valign="bottom"|26
| align="center" valign="bottom"|26
| align="center" valign="bottom"|SD_SPI_MISO
| align="center" valign="bottom"|PIN_SPI1_MISO
| align="center" valign="bottom"|35
|-
| align="center" valign="bottom" height="17"|TPS
| align="center" valign="bottom"|1
| align="center" valign="bottom"|15
| align="center" valign="bottom"|47
| align="center" valign="bottom"|SD_EN_PIN
| align="center" valign="bottom"|SDCARD_EN_PIN
| align="center" valign="bottom"|36
|-
| align="center" valign="bottom" height="17"|9
| align="center" valign="bottom"|1
| align="center" valign="bottom"|14
| align="center" valign="bottom"|46
| align="center" valign="bottom"|SD_DETECT_PIN
| align="center" valign="bottom"|SDCARD_DETECT_PIN
| align="center" valign="bottom"|37
|-
| colspan="7" align="center" valign="middle" bgcolor="#FFFF00" height="17"|Xlbee pins
|-
| align="center" valign="bottom" bgcolor="#729FCF" height="17"|Xlbee pin
| align="center" valign="bottom" bgcolor="#729FCF"|port
| align="center" valign="bottom" bgcolor="#729FCF"|pin
| align="center" valign="bottom" bgcolor="#729FCF"|identifier
| align="center" valign="bottom" bgcolor="#729FCF"|rôle
| align="center" valign="bottom" bgcolor="#729FCF"|
| align="center" valign="bottom" bgcolor="#729FCF"|PinMap Pos
|-
| align="center" valign="bottom" height="17"|U302(3)
| align="center" valign="bottom"|1
| align="center" valign="bottom"|3
| align="center" valign="bottom"|35
| align="center" valign="bottom"|MCU_XLB_EN
| align="center" valign="bottom"|XLB_EN
| align="center" valign="bottom"|38
|-
| align="center" valign="bottom" height="17"|5
| align="center" valign="bottom"|1
| align="center" valign="bottom"|2
| align="center" valign="bottom"|34
| align="center" valign="bottom"|!XLB_RST!
| align="center" valign="bottom"|XLB_RST
| align="center" valign="bottom"|39
|-
| align="center" valign="bottom" height="17"|37
| align="center" valign="bottom"|0
| align="center" valign="bottom"|31
| align="center" valign="bottom"|31
| align="center" valign="bottom"|SPI0_CS0
| align="center" valign="bottom"|SS
| align="center" valign="bottom"|40
|-
| colspan="7" align="center" valign="middle" bgcolor="#FFFF00" height="17"|Analog Pins
|-
| align="center" valign="bottom" bgcolor="#729FCF" height="17"|Analog pin
| align="center" valign="bottom" bgcolor="#729FCF"|port
| align="center" valign="bottom" bgcolor="#729FCF"|pin
| align="center" valign="bottom" bgcolor="#729FCF"|identifier
| align="center" valign="bottom" bgcolor="#729FCF"|rôle
| align="center" valign="bottom" bgcolor="#729FCF"|
| align="center" valign="bottom" bgcolor="#729FCF"|PinMap Pos
|-
| align="center" valign="bottom" height="17"|VBAT_MES
| align="center" valign="bottom"|0
| align="center" valign="bottom"|24
| align="center" valign="bottom"|24
| align="center" valign="bottom"|AIN7
| align="center" valign="bottom"|PIN_A0
| align="center" valign="bottom"|41
|-
| colspan="7" align="center" valign="middle" bgcolor="#FFFF00" height="17"|Output Voltage Enablers
|-
| align="center" valign="bottom" bgcolor="#729FCF" height="17"|TPS pin
| align="center" valign="bottom" bgcolor="#729FCF"|port
| align="center" valign="bottom" bgcolor="#729FCF"|pin
| align="center" valign="bottom" bgcolor="#729FCF"|identifier
| align="center" valign="bottom" bgcolor="#729FCF"|rôle
| align="center" valign="bottom" bgcolor="#729FCF"|
| align="center" valign="bottom" bgcolor="#729FCF"|PinMap Pos
|-
| align="center" valign="bottom" height="17"|U304(3)
| align="center" valign="bottom"|1
| align="center" valign="bottom"|12
| align="center" valign="bottom"|44
| align="center" valign="bottom"|3V3_SW_EN
| align="center" valign="bottom"|SW_3V3_EN
| align="center" valign="bottom"|42
|-
| align="center" valign="bottom" height="17"|U305(3)
| align="center" valign="bottom"|1
| align="center" valign="bottom"|4
| align="center" valign="bottom"|36
| align="center" valign="bottom"|VDD_SW_EN
| align="center" valign="bottom"|SW_VDD_EN
| align="center" valign="bottom"|43
|}
Then you can use it and declare it as an INPUT or an OUTPUT using pinMode() function.
If it is an output you can set its state using digitalWrite() function.
For example we want to activate 3V3_SW, it is a power-rail that is commanded by the GPIO : 3V3_SW_EN.
The corresponding arduino name is : SW_3V3_EN.
In our arduino sketch we can write :
pinMode(SW_3V3_EN, OUTPUT);
digitalWrite(SW_3V3_EN, HIGH);
This will configure SW_3V3_EN as an output and set its state to high=1. So it will activate our power rail 3V3_SW.