IC pinouts

1: CH32V203 pinout

2: ESP32C6 pinout

3: ESP32-P4 pinout

IC pinout mapping to functions on the board.

1 - CH32V203 pinout

CH32V203

Pin Number	Pin Name	Net Name	Direction	Notes
1	VBAT	VBAT	Power	Regulated 2.5V supply
2	PC13	POWER_ON_PULSE	Output	Emit pulse to wake up badge
3	PC14	XTAL	Input	Crystal Oscillator
4	PC15	XTAL	Input	Crystal Oscillator
5	PD0	AMP_EN	Output	Enable audio speaker amplifier
6	PD1	USB_ENABLE	Output	Enable to USB-A OTG port
7	NRST	NRST	Input	3V3
8	VSSA	VSSA	Power	Analog Ground
9	VDDA	VDDA	Power	Analog Power
10	PA0	INT	Output	Interrupt line to ESP32-P4
11	PA1	KB_ROW5	Output	Keyboard IO
12	PA2	KB_ROW8	Output	Keyboard IO
13	PA3	KB_ROW4	Output	Keyboard IO
14	PA4	KB_ROW3	Output	Keyboard IO
15	PA5	KB_ROW7	Output	Keyboard IO
16	PA6	KB_ROW6	Output	Keyboard IO
17	PA7	KB_COL3	Input	Keyboard IO
18	PB0	KB_COL7	Input	Keyboard IO
19	PB1	KB_COL2	Input	Keyboard IO
20	PB2/BOOT1	KB_COL6	Input	Keyboard IO
21	PB10	PM_SCL	Output	I2C Clock PMIC (Power controller)
22	PB11	PM_SDA	Bidirectional	I2C Data PMIC
23	VSS1	GND	Power	Ground
24	VDDIO1	+3.3V	Power	Power Supply
25	PB12	KB_COL1	Input	Keyboard IO
26	PB13	KB_COL5	Input	Keyboard IO
27	PB14	KB_COL0	Input	Keyboard IO
28	PB15	KB_COL4	Input	Keyboard IO
29	PA8	KB_ROW0	Output	Keyboard IO
30	PA9	KB_ROW1	Output	Keyboard IO
31	PA10	KB_ROW2	Output	Keyboard IO
32	PA11	LED_DATA	Output	Serial data to SK6805 LEDs
33	PA12	POWER_BTN	Input	Power button input (low when pressed)
34	PA13	SWDIO	Bidirectional	Debug Interface CH32V203
35	VSS2	GND	Power	Ground
36	VDD2	+3.3V	Power	Power Supply
37	PA14	SWCLK	Output	Debug Clock
38	PA15	SD_DET	Input	SD card detect
39	PB3	KEYBOARD_BL	Output	Enable backlight Keyboard
40	PB4	DISPLAY_BL	Output	Enable backlight display
41	PB5	HP_DET	Input	Head phone detect
42	PB6	SCL	input	I2C Clock shared bus
43	PB7	SDA	Bidirectional	I2C Data shared bus
44	BOOT0	DCAM_IO0	Output	Camera module power enable (if present)
45	PB8	RADIO_ENABLE / CAM_IO0	Output	Enable C6 and MIPI_CSI camera IO 0
46	PB9	PM_INT	Input	Interrupt signal PMIC
47	VSS3	GND	Power	GND
48	VDDIO3	+3.3V	Power	Power

2 - ESP32C6 pinout

Schematic

ESP32 Pin table

Pin	Name	Net	Direction	Function
1	GND	Power
2	3V3	Power
3	EN	EN	Input	Enable signal from the CH32V203
4	IO4	LORA_DIO1	Input	LoRa IRQ (Interrupt)
5	IO5	LORA_BUSY	Input	LoRa Busy Signal
6	IO6	I2C_SDA	Bidirectional	I2C Data Line
7	IO7	I2C_SCL	Input	I2C Clock Line
8	IO0	LORA_SCK	Input	LoRa SPI Clock
9	IO1	LORA_CS	Output	LoRa SPI Chip Select
10	IO8	INT	Output	Interrupt line to ESP32-P4
11	IO10	LORA_RESET	Output	LoRa Reset
12	GND	Power
13	IO12	C6_USB1_N	Bidirectional	Via USB hub to USB-C port
14	IO13	C6_USB1_P	Bidirectional	Via USB hub to USB-C port
15	IO9	BOOT	Input	BOOT mode select and VUSB (USB-A power) enable line
16	IO18	SDIO_CMD	Bidirectional	SDIO bus to P4 Command
17	IO19	SDIO_CLK	Output	SDIO bus to P4 Clock
18	IO20	SDIO_DATA0	Bidirectional	SDIO bus to P4 Data Line 0
19	IO21	SDIO_DATA1	Bidirectional	SDIO bus to P4 Data Line 1
20	IO22	SDIO_DATA2	Bidirectional	SDIO bus to P4 Data Line 2
21	IO23	SDIO_DATA3	Bidirectional	SDIO bus to P4 Data Line 3
22	NC
23	IO15	IR_LED	Output	Infrared LED Control
24	RXD0	RX	Input	UART to P4 Receive
25	TXD0	TX	Output	UART to P4 Transmit
26	IO3	LORA_MISO	Input	LoRa SPI MISO
27	IO2	LORA_MOSI	Output	LoRa SPI MOSI
28	GND	Power
29	GND	Power

3 - ESP32-P4 pinout

ESP32-P4 (U8)

LDO

Pin number	Pin name	Pin net
71	VFB/VO1	VFLASH
72	VFB/VO2	VPSRAM
73	VFB/VO3	VMIPI
74	VFB/VO4	VSDCARD

GPIO

GPIO	Direction / Bus	Function	Note
0	User controlled	Internal Add-On: E2
1	Input	Interrupt from CH32V203 coprocessor	High on interrupt from CH32 co-processor
2	User controlled	JTAG: MTCK, PMOD: IO	Can be used as JTAG interface or as generic GPIO on the external Add-On connector
3	User controlled	JTAG: MTDI, PMOD: IO	Can be used as JTAG interface or as generic GPIO on the external Add-On connector
4	User controlled	JTAG: MTMS, PMOD: IO	Can be used as JTAG interface or as generic GPIO on the external Add-On connector
5	User controlled	JTAG: MTDO, PMOD: IO	Can be used as JTAG interface or as generic GPIO on the external Add-On connector
6	Input	E1 expansion + Camera module LED enable	Read from the coprocessor I2C device to clear the interrupt condition
7	Input / User controlled	Interrupt from internal Add-On board	Can also be used as GPIO, depending on the needs of the internal Add-On board
8	Input	Interrupt from ESP32-C6 radio	Controlled by ESP-HOSTED component
9	I2C bus SDA	Internal I2C bus data	Internal I2C bus connecting the ESP32-P4 to the ESP32-C6, CH32V203 coprocessor, Bosch sensors and internal Add-On board
10	I2C bus SCL	Internal I2C bus clock	Internal I2C bus connecting the ESP32-P4 to the ESP32-C6, CH32V203 coprocessor, Bosch sensors and internal Add-On board
11	Input	LCD TE (Tearing effect)	Synchronization pin for frame sync, used to avoid tearing
12	User controlled	SAO: I2C SDA, PMOD: IO	Can be used as I2C interface for SAO Add-On boards or as generic GPIO on the external Add-On connector
13	User controlled	SAO: I2C SCL, PMOD: IO	Can be used as I2C interface for SAO Add-On boards or as generic GPIO on the external Add-On connector
14	Output	LCD reset	Hardware reset for the LCD controller
15	User controlled	SAO: IO1, PMOD: IO	Can be used as generic GPIO for SAO Add-On boards or as generic GPIO on the external Add-On connector
16	SDIO 2.0	SDIO bus for ESP32-C6: CMD	Controlled by ESP-HOSTED component
17	SDIO 2.0	SDIO bus for ESP32-C6: CLK	Controlled by ESP-HOSTED component
18	SDIO 2.0	SDIO bus for ESP32-C6: D0	Controlled by ESP-HOSTED component
19	SDIO 2.0	SDIO bus for ESP32-C6: D1	Controlled by ESP-HOSTED component
20	SDIO 2.0	SDIO bus for ESP32-C6: D2	Controlled by ESP-HOSTED component
21	SDIO 2.0	SDIO bus for ESP32-C6: D3	Controlled by ESP-HOSTED component
22	Bidirectional	CH32V203 programming interface: SWDIO	For coprocessor firmware updates
23	Output	CH32V203 programming interface: SWCLK	For coprocessor firmware updates
24	USB	USB DN, port 1 on USB hub (USB-C port)
25	USB	USB DP, port 1 on USB hub (USB-C port)
26	User controlled	Internal Add-On: USB DN or generic GPIO	Pin 24
27	User controlled	Internal Add-On: USB DP or generic GPIO	Pin 22
28	I2S	I2S: data	Internal I2S to the DAC towards headphone jack and speaker
29	I2S	I2S: sample clock	Internal I2S to the DAC towards headphone jack and speaker
30	I2S	I2S: master clock	Internal I2S to the DAC towards headphone jack and speaker
31	I2S	I2S: lr clock	Internal I2S to the DAC towards headphone jack and speaker
32	I3C	I2C/I3C QWIIC port: SCL	Connected to external I3C connector
33	I3C	I2C/I3C QWIIC port: SDA	Connected to external I3C connector
34	User controlled	SAO: IO2, PMOD: IO
35	User controlled	Internal Add-On: E1 / BOOT	1 during reset release SPI boot, 0 is DEBUG (page 32 data sheet) (Connected up to volume down button)
36	User controlled	Internal Add-On: E0	Depending on fuses can influence boot
37	Output / User controlled	Debug UART transmit	Pin 26 on the back expansion
38	Input / User controlled	Debug UART receive	Pin 28 on the back expansion
39	SDIO 3.0	SD card slot: D0
40	SDIO 3.0	SD card slot: D1
41	SDIO 3.0	SD card slot: D2
42	SDIO 3.0	SD card slot: D3
43	SDIO 3.0	SD card slot: CLK
44	SDIO 3.0	SD card slot: CMD
45	User controlled	Internal Add-On: E6	Pin 17 Back expansion header
46	User controlled	Internal Add-On: E3	Pin 14 Back expansion header
47	User controlled	Internal Add-On: E4	Pin 15 Back expansion header
48	User controlled	Internal Add-On: E5	Pin 16 Back expansion header
49	User controlled	Internal Add-On: E7	Pin 20 Back expansion header
50	User controlled	Internal Add-On: E8	Pin 27 Back expansion header
51	User controlled	Internal Add-On: E9	Pin 25 Back expansion header
52	User controlled	Internal Add-On: E10	Pin 23 Back expansion header
53	User controlled	Internal Add-On: E11	Pin 21 Back expansion header
54	User controlled	Internal Add-On: E12	Pin 19 Back expansion header