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Rock3/CM3p/e25/GPIO

< Rock3‎ | CM3p‎ | e25
     ROCK 3 >  ROCK 3 Compute Module Plus >  Radxa E25 >  GPIO

General purpose input-output (GPIO) connector

Radxa E25 has a 10-pin expansion header.

Pin# Function1 Function2 Function3 Function4 Gpionumber
1 GPIO0_B4 CAN0_RX_M0 I2C1_SDA 12
2 GPIO3_C2 SPI1_MISO_M1 UART5_TX_M1 I2S1_SDO3_M2 114
3 GPIO3_C3 SPI1_CLK_M1 UART5_RX_M1 I2S1_SCLK_RX_M2 115
4 GPIO3_C0 PWM13_M0 UART3_RX_M1 112
5 GND
6 GPIO1_A1 CAN1_TX_M0 UART3_TX_M0 I2C3_SCL_M0 33
7 GPIO1_A0 CAN1_RX_M0 UART3_RX_M0 I2C3_SDA_M0 32
8 GPIO3_A1 SPI1_CS0_M1 97
9 GPIO3_C1 I2S1_SDO2_M2 SPI1_MOSI_M1 113
10 GPIO0_B3 CAN0_TX_M0 I2C1_SCL 11

More details about 10-pin Header In V1.3

  • PWM;x1; PWM13
  • SPI: x1; PSI1
  • I2C: x2;I2C1/I2C3/
  • UART: x2;UART3/UART5
  • CAN: x1;CAN0

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 GPIO3_C2 (PIN2 on 10-PIN HEADER) as an example:

GPIO3_C2 = 3*32 + 2*8 + 2 = 114 
(A=0, B=1, C=2, D=3)

To set GPIO3_C2 output

cd /sys/class/gpio
echo 114> export
cd gpio114
echo out > direction
echo 1 > value     # output high
echo 0 > value     # output low