Rock3/hardware/rock3a-gpio

    ROCK 3 >  Hardware >  ROCK 3A GPIO

General purpose input-output (GPIO) connector

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

Hardware V1.2

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
111		UART3_TX_M1	PWM12_M0	GPIO3_B7	7	8	GPIO0_D1	UART2_TXD			25
				GND	9	10	GPIO0_D0	UART2_RXD			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	GPIO3_A1	SPI1_CS0_M1			97
17		UART0_TX	PWM2_M0	GPIO0_C1	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	ADC_IN5
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			153
14	PWM2_M1	SPI0_MOSI_M0	I2C2_SDA_M0	GPIO0_B6	27	28	GPIO0_B5	I2C2_CLK_M0	SPI0_CLK_M0	PWM1_M1	13
95		UART8_TX_M1	SPI2_MISO_M1	GPIO2_D7	29	30	GND
96		UART8_RX_M1	SPI2_CLK_M1	GPIO3_A0	31	32	GPIO3_C2	SPI1_MISO_M1	UART5_TX_M1		114
115		UART5_RX_M1	SPI1_CLK_M1	GPIO3_C3	33	34	GND
100				GPIO3_A4	35	36	GPIO3_A2				98
112		UART3_RX_M1	PWM13_M0	GPIO3_C0	37	38	GPIO3_A6				102
				GND	39	40	GPIO3_A5				101

More details about 40-pin Header

Pins marked with color orange are designed for debug console.
PWM; x6, PWM1/PWM2/PWM12/PWM13/PWM14/PWM15
SPI: x1, SPI3
I2C: x2, I2C2/I2C3
UART: x5, UART0/UART3/UART5/UART7/UART9
ADC: x1, ADC_IN5
CAN: x1, CAN1
USB: x1, PIN#27 and PIN#28
- When we select this USB function, you need to modify the hardware like this.
  - Remove R90526 R90527
  - Add R90536 R90537

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