GPIO Map

This page documents all GPIO allocations on the ESP32-P4-WIFI6-DEV-KIT, covering both the external 40-pin header and internal connections to onboard peripherals.

40-pin header GPIO assignments

The header uses a 2x20 layout at 2.54 mm pitch. Pin 1 is top-left.

Pin	Function	GPIO		Pin	Function	GPIO
1	3V3	—		2	5V	—
3	SDA	GPIO7		4	5V	—
5	SCL	GPIO8		6	GND	—
7	GPIO	GPIO23		8	TXD	GPIO37
9	GND	—		10	RXD	GPIO38
11	GPIO	GPIO21		12	GPIO	GPIO22
13	GPIO	GPIO20		14	GND	—
15	GPIO	GPIO6		16	GPIO	GPIO5
17	3V3	—		18	GPIO	GPIO4
19	GPIO	GPIO3		20	GND	—
21	GPIO	GPIO2		22	GPIO	GPIO1
23	GPIO	GPIO0		24	GPIO	GPIO36
25	GND	—		26	GPIO	GPIO32
27	GPIO	GPIO24		28	GPIO	GPIO25
29	GPIO	GPIO33		30	GND	—
31	GPIO	GPIO26		32	GPIO	GPIO54
33	GPIO	GPIO48		34	GND	—
35	GPIO	GPIO53		36	GPIO	GPIO46
37	GPIO	GPIO47		38	GPIO	GPIO27
39	GND	—		40	GPIO	GPIO45

Internal peripheral GPIO assignments

These GPIOs are connected to onboard hardware and are not exposed on the 40-pin header. Reassigning them in software will disable the corresponding onboard peripheral.

I2S audio (ES8311 codec)

Signal	GPIO	Direction	Description
MCLK	GPIO13	Output	Master clock to ES8311
SCLK	GPIO12	Output	Serial clock (bit clock)
ASDOUT	GPIO11	Output	Audio serial data out (P4 to codec)
LRCK	GPIO10	Output	Left/right channel clock (word select)
DSDIN	GPIO9	Input	Audio serial data in (codec to P4)
PA_Ctrl	GPIO53	Output	NS4150B amplifier enable

Caution

GPIO53 serves double duty: it is both the amplifier power control and a pin on the 40-pin header (pin 35). If you use the onboard speaker, do not repurpose pin 35. If the speaker is unused, GPIO53 is available as a standard output.

I2C (default bus)

Signal	GPIO	Direction	Notes
SCL	GPIO8	Bidirectional	Also on header pin 5 and I2C port
SDA	GPIO7	Bidirectional	Also on header pin 3 and I2C port

The default I2C bus is shared across three physical connectors: the 40-pin header (pins 3, 5), the dedicated I2C port (component 15), and the internal connection to the ES8311 codec. All devices on these connections share the same I2C bus.

UART (header)

Signal	GPIO	Direction	Notes
TXD	GPIO37	Output	Header pin 8
RXD	GPIO38	Input	Header pin 10

Note

This UART is independent of the USB-C UART port, which uses the CH343 bridge on separate internal GPIOs. The header UART is available for external serial devices.

GPIO allocation summary

GPIO	Primary Assignment	Shared	Exposed on Header
GPIO0	General GPIO	No	Yes (pin 23)
GPIO1	General GPIO	No	Yes (pin 22)
GPIO2	General GPIO	No	Yes (pin 21)
GPIO3	General GPIO	No	Yes (pin 19)
GPIO4	General GPIO	No	Yes (pin 18)
GPIO5	General GPIO	No	Yes (pin 16)
GPIO6	General GPIO	No	Yes (pin 15)
GPIO7	I2C SDA	Yes (header + I2C port + codec)	Yes (pin 3)
GPIO8	I2C SCL	Yes (header + I2C port + codec)	Yes (pin 5)
GPIO9	I2S DSDIN	Internal (audio)	No
GPIO10	I2S LRCK	Internal (audio)	No
GPIO11	I2S ASDOUT	Internal (audio)	No
GPIO12	I2S SCLK	Internal (audio)	No
GPIO13	I2S MCLK	Internal (audio)	No
GPIO20	General GPIO	No	Yes (pin 13)
GPIO21	General GPIO	No	Yes (pin 11)
GPIO22	General GPIO	No	Yes (pin 12)
GPIO23	General GPIO	No	Yes (pin 7)
GPIO24	General GPIO	No	Yes (pin 27)
GPIO25	General GPIO	No	Yes (pin 28)
GPIO26	General GPIO	No	Yes (pin 31)
GPIO27	General GPIO	No	Yes (pin 38)
GPIO32	General GPIO	No	Yes (pin 26)
GPIO33	General GPIO	No	Yes (pin 29)
GPIO36	General GPIO	No	Yes (pin 24)
GPIO37	UART TXD	No	Yes (pin 8)
GPIO38	UART RXD	No	Yes (pin 10)
GPIO45	General GPIO	No	Yes (pin 40)
GPIO46	General GPIO	No	Yes (pin 36)
GPIO47	General GPIO	No	Yes (pin 37)
GPIO48	General GPIO	No	Yes (pin 33)
GPIO53	PA_Ctrl / GPIO	Yes (audio amp + header)	Yes (pin 35)
GPIO54	General GPIO	No	Yes (pin 32)

---

GPIO assignments sourced from the Waveshare ESP32-P4-WIFI6-DEV-KIT Wiki and ESP32-P4 datasheet.