Rock3/hardware/3b/gpio

    ROCK 3 >  Hardware >  ROCK 3 Model B Main Board >  ROCK 3B GPIO

General purpose input-output (GPIO) connector

ROCK 3B has one 40-pin expansion header. Each pin is distinguished by color.

Hardware V1.1

GPIO number	Function4	Function3	Function2	Function1	Pin#	Pin#	Function1	Function2	Function3	Function4	GPIO number
				+3.3V	1	2	+5.0V
32	CAN1_RX_M0	UART3_RX_M0	I2C3_SDA_M0	GPIO1_A0	3	4	+5.0V
33	CAN1_TX_M0	UART3_TX_M0	I2C3_SCL_M0	GPIO1_A1	5	6	GND
13		PWM1_M1	I2C2_SCL_M0	GPIO0_B5	7	8	GPIO0_D1	UART2_TX_M0			25
				GND	9	10	GPIO0_D0	UART2_RX_M0			24
116		UART7_TX_M1	PWM14_M0	GPIO3_C4	11	12	GPIO3_A3				99
117		UART7_RX_M1	PWM15_IR_M0	GPIO3_C5	13	14	GND
16		UART0_RX	PWM1_M0	GPIO0_C0	15	16	GPIO0_B6	I2C2_SDA_M0	PWM2_M1		14
				+3.3V	17	18	GPIO3_B2	UART4_TX_M1	PWM9_M0		106
147	CAN1_TX_M1	SPI3_MOSI_M1	PWM15_IR_M1	GPIO4_C3	19	20	GND
149	UART9_TX_M1	SPI3_MISO_M1	PWM12_M1	GPIO4_C5	21	22	GPIO0_C1	PWM2_M0	UART0_TX		17
146	CAN1_RX_M1	SPI3_CLK_M1	PWM14_M1	GPIO4_C2	23	24	GPIO4_C6	PWM13_M1	SPI3_CS0_M1	UART9_RX_M1	150
				GND	25	26	GPIO4_D1	SPI3_CS1_M1
12	USB_DP	CAN0_RX_M0	I2C1_SDA	GPIO0_B4	27	28	GPIO0_B3	I2C1_SCL	CAN0_TX_M0	USB_DM	11
95				GPIO2_D7	29	30	GND
96				GPIO3_A0	31	32	GPIO3_C2	UART5_TX_M1			114
115		UART5_RX_M1	SPI1_CLK_M1	GPIO3_C3	33	34	GND
100				GPIO3_A4	35	36	GPIO3_A2				98
				SARADC_VIN5	37	38	GPIO3_A6				102
				GND	39	40	GPIO3_A5				101

More details about 40-pin Header In V1.3/V1.31

Pins marked with color orange are designed for debug console.
PWM; x7, PWM1 / PWM2 / PWM9 / PWM12 / PWM13 / PWM14 / PWM15
SPI: x1, SPI3
I2C: x3, I2C1 / I2C2 / I2C3
UART: x6, UART0 / UART3 / UART5 / UART7 / UART8 / UART9
ADC: x1, SARADC_VIN5
CAN: x2, CAN0 / CAN1

IO Voltage

RK3568 have three IO voltages, 1.8V/3.3V. For ROCK 3, the high level voltage of GPIO pin on 40-PIN HEADER is 3.3V.

| GPIO       | Voltage Level | Tolerance |
| ---------- | ------------- | --------- |
| GPIO3_C0   | 3.3V          | 3.63V     |
| ADC_IN5    | 1.8V          | 1.98V     |

GPIO number

Rockchip RK3568 GPIO has 5 banks, GPIO0 to GPIO4, each bank has 32pins, naming as below:

GPIO0_A0 ~ A7 
GPIO0_B0 ~ B7
GPIO0_C0 ~ C7
GPIO0_D0 ~ D7
   
GPIO1_A0 ~ A7
....
GPIO1_D0 ~ D7

For Rockchip 4.19 kernel, the GPIO number can be calculated as below, take GPIO4_D1 (PIN26 on 4-0PIN HEADER) as an example:

GPIO4_D1 = 4*32 + 3*8 + 1 = 153
(A=0, B=1, C=2, D=3)

To set GPIO4_D1 output

cd /sys/class/gpio
echo 153 > export
cd gpio153
echo out > direction
echo 1 > value     # output high
echo 0 > value     # output low